---
schema: rendered-html/v1
title: "Changelog - FastMCP"
source_url: https://gofastmcp.com/changelog
generated_at: 2026-06-11T19:38:14.395257+00:00
---




[FastMCP home page![light logo](images/gofastmcp__com__changelog__wordmark.avif)![dark logo](images/gofastmcp__com__changelog__wordmark-white.avif)](gofastmcp__com.md)







What's New

Changelog





















  - [Updates

    NEW](gofastmcp__com__updates.md)
  - [Changelog

    NEW](/changelog)


- [v3.4.1](#v3-4-1)
- [v3.4.0](#v3-4-0)
- [v3.3.1](#v3-3-1)
- [v3.3.0](#v3-3-0)
- [v3.2.4](#v3-2-4)
- [v3.2.3](#v3-2-3)
- [v3.2.2](#v3-2-2)
- [v3.2.1](#v3-2-1)
- [v3.2.0](#v3-2-0)
- [v3.1.1](#v3-1-1)
- [v3.1.0](#v3-1-0)
- [v3.0.2](#v3-0-2)
- [v3.0.1](#v3-0-1)
- [v3.0.0](#v3-0-0)
- [v3.0.0rc1](#v3-0-0rc1)
- [v3.0.0b2](#v3-0-0b2)
- [v3.0.0b1](#v3-0-0b1)
- [v2.14.7](#v2-14-7)
- [v2.14.6](#v2-14-6)
- [v2.14.5](#v2-14-5)
- [v2.14.4](#v2-14-4)
- [v2.14.3](#v2-14-3)
- [v2.14.2](#v2-14-2)
- [v2.14.1](#v2-14-1)
- [v2.14.0](#v2-14-0)
- [v2.13.3](#v2-13-3)
- [v2.13.2](#v2-13-2)
- [v2.13.1](#v2-13-1)
- [v2.13.0](#v2-13-0)
- [v2.12.5](#v2-12-5)
- [v2.12.4](#v2-12-4)
- [v2.12.3](#v2-12-3)
- [v2.12.2](#v2-12-2)
- [v2.12.1](#v2-12-1)
- [v2.12.0](#v2-12-0)
- [v2.11.3](#v2-11-3)
- [v2.11.2](#v2-11-2)
- [v2.11.1](#v2-11-1)
- [v2.11.0](#v2-11-0)
- [v2.10.6](#v2-10-6)
- [v2.10.5](#v2-10-5)
- [v2.10.4](#v2-10-4)
- [v2.10.3](#v2-10-3)
- [v2.10.2](#v2-10-2)
- [v2.10.1](#v2-10-1)
- [v2.10.0](#v2-10-0)
- [v2.9.2](#v2-9-2)
- [v2.9.1](#v2-9-1)
- [v2.9.0](#v2-9-0)
- [v2.8.1](#v2-8-1)
- [v2.8.0](#v2-8-0)
- [v2.7.1](#v2-7-1)
- [v2.7.0](#v2-7-0)
- [v2.6.1](#v2-6-1)
- [v2.6.0](#v2-6-0)
- [v2.5.2](#v2-5-2)
- [v2.5.1](#v2-5-1)
- [v2.5.0](#v2-5-0)
- [v2.4.0](#v2-4-0)
- [v2.3.5](#v2-3-5)
- [v2.3.4](#v2-3-4)
- [v2.3.3](#v2-3-3)
- [v2.3.2](#v2-3-2)
- [v2.3.1](#v2-3-1)
- [v2.3.0](#v2-3-0)
- [v2.2.10](#v2-2-10)
- [v2.2.9](#v2-2-9)
- [v2.2.8](#v2-2-8)
- [v2.2.7](#v2-2-7)
- [v2.2.6](#v2-2-6)
- [v2.2.5](#v2-2-5)
- [v2.2.4](#v2-2-4)
- [v2.2.3](#v2-2-3)
- [v2.2.2](#v2-2-2)
- [v2.2.1](#v2-2-1)
- [v2.2.0](#v2-2-0)
- [v2.1.2](#v2-1-2)
- [v2.1.1](#v2-1-1)
- [v2.1.0](#v2-1-0)
- [v2.0.0](#v2-0-0)
- [v1.0](#v1-0)
- [v0.4.1](#v0-4-1)
- [v0.4.0](#v0-4-0)
- [v0.3.5](#v0-3-5)
- [v0.3.4](#v0-3-4)
- [v0.3.3](#v0-3-3)
- [v0.3.2](#v0-3-2)
- [v0.3.1](#v0-3-1)
- [v0.3.0](#v0-3-0)
- [v0.2.0](#v0-2-0)
- [v0.1.0](#v0-1-0)

What's New

# Changelog



[​](#v3-4-1)

v3.4.1

2026-06-05

**[v3.4.1: Floor It](https://github.com/PrefectHQ/fastmcp/releases/tag/v3.4.1)**FastMCP 3.4.1 floors Starlette at `>=1.0.1` so installs can no longer resolve to a version affected by CVE-2026-48710, which was previously only constrained transitively through `mcp`. It also makes OAuthProxy log refresh-token cache misses instead of failing silently.

### [​](#enhancements-) Enhancements ✨

- Log refresh-token misses in OAuthProxy instead of failing silently by [@jlowin](https://github.com/jlowin) in [#4276](https://github.com/PrefectHQ/fastmcp/pull/4276)

### [​](#security-) Security 🔒

- Add explicit starlette>=1.0.1 floor (CVE-2026-48710) by [@jlowin](https://github.com/jlowin) in [#4286](https://github.com/PrefectHQ/fastmcp/pull/4286)

### [​](#docs-) Docs 📚

- Document —notes-start-tag in release instructions by [@jlowin](https://github.com/jlowin) in [#4275](https://github.com/PrefectHQ/fastmcp/pull/4275)

**Full Changelog**: [v3.4.0…v3.4.1](https://github.com/PrefectHQ/fastmcp/compare/v3.4.0...v3.4.1)

[​](#v3-4-0)

v3.4.0

2026-06-02

**[v3.4.0: Remote Control](https://github.com/PrefectHQ/fastmcp/releases/tag/v3.4.0)**FastMCP 3.4 is about reaching servers that live somewhere else. The headline is `fastmcp-remote`, a standalone bridge that connects stdio-only MCP hosts to servers hosted over HTTP. Around it, the proxy layer those connections depend on is hardened: a proxy now forwards `initialize` upstream and fails loudly when the backend is missing or misconfigured, instead of reporting a connected-but-empty proxy. And FastMCP-issued access tokens can now outlive short-lived upstream tokens, so authenticated sessions survive the long idle periods remote clients are prone to.

### [​](#new-features-) New Features 🎉

- Add fastmcp-remote bridge package by [@jlowin](https://github.com/jlowin) in [#4208](https://github.com/PrefectHQ/fastmcp/pull/4208)

### [​](#breaking-changes-) Breaking Changes ⚠️

- Forward proxy initialize as bridge behavior by [@jlowin](https://github.com/jlowin) in [#4228](https://github.com/PrefectHQ/fastmcp/pull/4228)

### [​](#enhancements--2) Enhancements ✨

- ci: require external PRs to link a tracked issue by [@strawgate](https://github.com/strawgate) in [#4173](https://github.com/PrefectHQ/fastmcp/pull/4173)
- feat: new options —host and —no-log-panel | —log-panel to cli dev apps by [@itaru2622](https://github.com/itaru2622) in [#4123](https://github.com/PrefectHQ/fastmcp/pull/4123)
- Add valid\_scopes and extra\_authorize\_params to WorkOSProvider by [@tiagoskaneta](https://github.com/tiagoskaneta) in [#4135](https://github.com/PrefectHQ/fastmcp/pull/4135)
- Add token\_expiry\_threshold\_seconds for proactive token refresh by [@mohankumarelec](https://github.com/mohankumarelec) in [#4142](https://github.com/PrefectHQ/fastmcp/pull/4142)
- Add review-issue skill for triaging gated external contributions by [@jlowin](https://github.com/jlowin) in [#4212](https://github.com/PrefectHQ/fastmcp/pull/4212)
- Add contract gate to review-issue skill by [@jlowin](https://github.com/jlowin) in [#4214](https://github.com/PrefectHQ/fastmcp/pull/4214)
- Let ToolResult return an error result via is\_error by [@jlowin](https://github.com/jlowin) in [#4217](https://github.com/PrefectHQ/fastmcp/pull/4217)
- Update published docs after PyPI release by [@jlowin](https://github.com/jlowin) in [#4211](https://github.com/PrefectHQ/fastmcp/pull/4211)
- Allow pre-bound HTTP sockets by [@jlowin](https://github.com/jlowin) in [#4222](https://github.com/PrefectHQ/fastmcp/pull/4222)
- Add targeted coverage tests by [@strawgate](https://github.com/strawgate) in [#4230](https://github.com/PrefectHQ/fastmcp/pull/4230)
- Upgrade ty to 0.0.39 by [@jlowin](https://github.com/jlowin) in [#4225](https://github.com/PrefectHQ/fastmcp/pull/4225)
- Decouple FastMCP access token lifetime from upstream expires\_in by [@jlowin](https://github.com/jlowin) in [#4254](https://github.com/PrefectHQ/fastmcp/pull/4254)

### [​](#security--2) Security 🔒

- feat(code-mode): default sandbox limits and per-execution tool-call cap by [@strawgate](https://github.com/strawgate) in [#4170](https://github.com/PrefectHQ/fastmcp/pull/4170)
- Security: Fix 3 findings in GitHub Actions workflows by [@jpr5](https://github.com/jpr5) in [#4183](https://github.com/PrefectHQ/fastmcp/pull/4183)
- Add outbound comment guardrails by [@jlowin](https://github.com/jlowin) in [#4196](https://github.com/PrefectHQ/fastmcp/pull/4196)
- Add uv dependency cooldown by [@jlowin](https://github.com/jlowin) in [#4213](https://github.com/PrefectHQ/fastmcp/pull/4213)

### [​](#fixes-) Fixes 🐞

- fix: VersionSpec eq matching normalizes versions and selects deterministically by [@strawgate](https://github.com/strawgate) in [#4058](https://github.com/PrefectHQ/fastmcp/pull/4058)
- fix(tests): hoist azure-identity import out of the OBO test timeout window by [@strawgate](https://github.com/strawgate) in [#4176](https://github.com/PrefectHQ/fastmcp/pull/4176)
- fix(auth): disambiguate auth-denied vs missing component messages by [@strawgate](https://github.com/strawgate) in [#4165](https://github.com/PrefectHQ/fastmcp/pull/4165)
- fix: preserve annotations, meta, title, icons when creating resources from templates by [@strawgate](https://github.com/strawgate) in [#4061](https://github.com/PrefectHQ/fastmcp/pull/4061)
- fix: add OTEL spans to sampling step and tool execution by [@strawgate](https://github.com/strawgate) in [#4059](https://github.com/PrefectHQ/fastmcp/pull/4059)
- fix(config): read MCP config files as UTF-8 by [@pragnyanramtha](https://github.com/pragnyanramtha) in [#4164](https://github.com/PrefectHQ/fastmcp/pull/4164)
- fix(schema): preserve root metadata on fallback by [@yuyua9](https://github.com/yuyua9) in [#4178](https://github.com/PrefectHQ/fastmcp/pull/4178)
- fix(proxy): restore \_current\_server in \_restore\_request\_context by [@strawgate](https://github.com/strawgate) in [#4168](https://github.com/PrefectHQ/fastmcp/pull/4168)
- fix(auth): add /.well-known/openid-configuration alias for OAuth server metadata by [@shigechika](https://github.com/shigechika) in [#4167](https://github.com/PrefectHQ/fastmcp/pull/4167)
- fix(code-mode): cancel Monty sandbox future on task cancellation by [@strawgate](https://github.com/strawgate) in [#4169](https://github.com/PrefectHQ/fastmcp/pull/4169)
- fix(auth): unprefix Azure scopes echoed back to MCP clients by [@rgillinlz](https://github.com/rgillinlz) in [#4130](https://github.com/PrefectHQ/fastmcp/pull/4130)
- fix(cli): forward stateless flag in uv run path by [@yuyua9](https://github.com/yuyua9) in [#4177](https://github.com/PrefectHQ/fastmcp/pull/4177)
- fix(ci): scope minimize-reviews concurrency by event name by [@strawgate](https://github.com/strawgate) in [#4174](https://github.com/PrefectHQ/fastmcp/pull/4174)
- Fix docs app demo iframe assets by [@jlowin](https://github.com/jlowin) in [#4194](https://github.com/PrefectHQ/fastmcp/pull/4194)
- Guard require-issue-link check job to pull\_request\_target events by [@jlowin](https://github.com/jlowin) in [#4209](https://github.com/PrefectHQ/fastmcp/pull/4209)
- Migrate auth JWTs to joserfc by [@jlowin](https://github.com/jlowin) in [#4221](https://github.com/PrefectHQ/fastmcp/pull/4221)
- Skip published docs update for prereleases by [@jlowin](https://github.com/jlowin) in [#4224](https://github.com/PrefectHQ/fastmcp/pull/4224)
- Surface proxy upstream failures by [@jlowin](https://github.com/jlowin) in [#4227](https://github.com/PrefectHQ/fastmcp/pull/4227)
- Close upstream OAuth clients by [@jlowin](https://github.com/jlowin) in [#4248](https://github.com/PrefectHQ/fastmcp/pull/4248)
- Fix GitHub MCP resource integration test by [@jlowin](https://github.com/jlowin) in [#4253](https://github.com/PrefectHQ/fastmcp/pull/4253)
- Fix resource templates with query params on proxied servers by [@rene84](https://github.com/rene84) in [#4251](https://github.com/PrefectHQ/fastmcp/pull/4251)

### [​](#docs--2) Docs 📚

- Document pip upgrade recovery for the fastmcp-slim package split by [@jlowin](https://github.com/jlowin) in [#4215](https://github.com/PrefectHQ/fastmcp/pull/4215)
- Move pip upgrade recovery into a Troubleshooting section by [@jlowin](https://github.com/jlowin) in [#4219](https://github.com/PrefectHQ/fastmcp/pull/4219)
- Restore Horizon docs banner by [@jlowin](https://github.com/jlowin) in [#4240](https://github.com/PrefectHQ/fastmcp/pull/4240)
- fix: Trendshift link and badge in README.md by [@bhantos](https://github.com/bhantos) in [#4236](https://github.com/PrefectHQ/fastmcp/pull/4236)
- docs: add tool fingerprinting recipe by [@dgenio](https://github.com/dgenio) in [#4233](https://github.com/PrefectHQ/fastmcp/pull/4233)

### [​](#dependencies-) Dependencies 📦

- chore(deps): bump the uv group across 2 directories with 1 update by [@dependabot](https://github.com/dependabot) in [#4113](https://github.com/PrefectHQ/fastmcp/pull/4113)
- chore(deps-dev): bump pydantic-monty from 0.0.16 to 0.0.17 by [@dependabot](https://github.com/dependabot) in [#4023](https://github.com/PrefectHQ/fastmcp/pull/4023)

### [​](#other-changes-) Other Changes 🦾

- Exempt maintainers from MRE auto-close by [@jlowin](https://github.com/jlowin) in [#4220](https://github.com/PrefectHQ/fastmcp/pull/4220)

## [​](#new-contributors) New Contributors

- @pragnyanramtha made their first contribution in [#4164](https://github.com/PrefectHQ/fastmcp/pull/4164)
- @yuyua9 made their first contribution in [#4178](https://github.com/PrefectHQ/fastmcp/pull/4178)
- @tiagoskaneta made their first contribution in [#4135](https://github.com/PrefectHQ/fastmcp/pull/4135)
- @mohankumarelec made their first contribution in [#4142](https://github.com/PrefectHQ/fastmcp/pull/4142)
- @rgillinlz made their first contribution in [#4130](https://github.com/PrefectHQ/fastmcp/pull/4130)
- @jpr5 made their first contribution in [#4183](https://github.com/PrefectHQ/fastmcp/pull/4183)
- @bhantos made their first contribution in [#4236](https://github.com/PrefectHQ/fastmcp/pull/4236)
- @rene84 made their first contribution in [#4251](https://github.com/PrefectHQ/fastmcp/pull/4251)

**Full Changelog**: [v3.3.1…v3.4.0](https://github.com/PrefectHQ/fastmcp/compare/v3.3.1...v3.4.0)

[​](#v3-3-1)

v3.3.1

2026-05-15

**[v3.3.1: Loop There It Is](https://github.com/PrefectHQ/fastmcp/releases/tag/v3.3.1)**A hotfix for the 3.3 packaging split. Clean installs could fail on standalone component imports like `from fastmcp.tools import tool`, because component modules reached auth and task primitives through `fastmcp.server` and pulled in the full server/provider stack. Those primitives now live in lightweight utility modules, with the old server import paths preserved as compatibility re-exports.

### [​](#fixes--2) Fixes 🐞

- fix(docs): use valid FA icon on client-only package page by [@jlowin](https://github.com/jlowin) in [#4139](https://github.com/PrefectHQ/fastmcp/pull/4139)
- Decouple component imports from server by [@jlowin](https://github.com/jlowin) in [#4150](https://github.com/PrefectHQ/fastmcp/pull/4150)

**Full Changelog**: [v3.3.0…v3.3.1](https://github.com/PrefectHQ/fastmcp/compare/v3.3.0...v3.3.1)

[​](#v3-3-0)

v3.3.0

2026-05-15

**[v3.3.0: Slim Reaper](https://github.com/PrefectHQ/fastmcp/releases/tag/v3.3.0)**FastMCP 3.3 ships `fastmcp-slim`, a dependency-light distribution that separates the client from the server stack — install FastMCP’s client and transport layer without Starlette, Uvicorn, or the rest of the server machinery. The import namespace is unchanged. It also closes out a backlog of OAuth proxy security hardening, MCP-compliant OTEL instrumentation, and auth additions that accumulated through the 3.2 cycle.

### [​](#new-features--2) New Features 🎉

- Add fastmcp-slim for client-only installs by [@jlowin](https://github.com/jlowin) in [#4122](https://github.com/PrefectHQ/fastmcp/pull/4122)

### [​](#enhancements--3) Enhancements ✨

- Add default prefill to FormInput.collect\_input by [@jlowin](https://github.com/jlowin) in [#3937](https://github.com/PrefectHQ/fastmcp/pull/3937)
- OTEL: Fix attribute compliance with MCP semantic conventions by [@strawgate](https://github.com/strawgate) in [#3889](https://github.com/PrefectHQ/fastmcp/pull/3889)
- OTEL: Instrument all MCP list operations and enrich delegate spans by [@strawgate](https://github.com/strawgate) in [#3890](https://github.com/PrefectHQ/fastmcp/pull/3890)
- Improve real-world schema crash test: failure dump, cluster analysis, TypeErrors baseline ratchet by [@jlowin](https://github.com/jlowin) in [#3958](https://github.com/PrefectHQ/fastmcp/pull/3958)
- feat: add AzureB2CProvider for Azure AD B2C user flows by [@carlos-rian](https://github.com/carlos-rian) in [#3995](https://github.com/PrefectHQ/fastmcp/pull/3995)
- Add run\_in\_thread opt-out for sync tools with thread affinity by [@jlowin](https://github.com/jlowin) in [#4010](https://github.com/PrefectHQ/fastmcp/pull/4010)
- Add missing return type annotation to **getattr** by [@ZLeventer](https://github.com/ZLeventer) in [#4026](https://github.com/PrefectHQ/fastmcp/pull/4026)
- Add experimental\_capabilities kwarg to FastMCP constructor by [@jlowin](https://github.com/jlowin) in [#4042](https://github.com/PrefectHQ/fastmcp/pull/4042)
- Add log\_level parameter to FastMCP errors by [@daniel-tsiang](https://github.com/daniel-tsiang) in [#4036](https://github.com/PrefectHQ/fastmcp/pull/4036)
- Bump pydocket to 0.20.0 by [@chrisguidry](https://github.com/chrisguidry) in [#4031](https://github.com/PrefectHQ/fastmcp/pull/4031)
- enh: Add public API for updating OAuthProxy scopes after initialization by [@taylorwilsdon](https://github.com/taylorwilsdon) in [#4091](https://github.com/PrefectHQ/fastmcp/pull/4091)
- Refine fastmcp-slim packaging by [@jlowin](https://github.com/jlowin) in [#4125](https://github.com/PrefectHQ/fastmcp/pull/4125)

### [​](#security--3) Security 🔒

- Harden OAuth Proxy silent consent against AS-in-the-middle by [@jlowin](https://github.com/jlowin) in [#3960](https://github.com/PrefectHQ/fastmcp/pull/3960)
- Reject dot-segments in redirect URI allowlist matching by [@jlowin](https://github.com/jlowin) in [#3963](https://github.com/PrefectHQ/fastmcp/pull/3963)
- Bump deps with open dependabot alerts by [@jlowin](https://github.com/jlowin) in [#3965](https://github.com/PrefectHQ/fastmcp/pull/3965)
- Partition ResponseCachingMiddleware cache by access token by [@jlowin](https://github.com/jlowin) in [#4041](https://github.com/PrefectHQ/fastmcp/pull/4041)

### [​](#fixes--3) Fixes 🐞

- fix: reject self-mount to prevent infinite recursion by [@strawgate](https://github.com/strawgate) in [#3925](https://github.com/PrefectHQ/fastmcp/pull/3925)
- fix: ProxyTool crashes on non-TextContent error responses by [@strawgate](https://github.com/strawgate) in [#3926](https://github.com/PrefectHQ/fastmcp/pull/3926)
- fix: \_prune\_param and \_convert\_nullable\_field mutate input schemas by [@strawgate](https://github.com/strawgate) in [#3927](https://github.com/PrefectHQ/fastmcp/pull/3927)
- fix: narrow OpenAI audio format dict to Literal for ty by [@jlowin](https://github.com/jlowin) in [#3936](https://github.com/PrefectHQ/fastmcp/pull/3936)
- fix: allow hyphens in resource template parameter names by [@strawgate](https://github.com/strawgate) in [#3929](https://github.com/PrefectHQ/fastmcp/pull/3929)
- fix: OpenAPI request director sends multipart and form-urlencoded as JSON by [@strawgate](https://github.com/strawgate) in [#3932](https://github.com/PrefectHQ/fastmcp/pull/3932)
- Fix raise\_on\_error handling for tool tasks by [@gnanirahulnutakki](https://github.com/gnanirahulnutakki) in [#3946](https://github.com/PrefectHQ/fastmcp/pull/3946)
- fix: FileSystemProvider reload race condition by [@strawgate](https://github.com/strawgate) in [#3938](https://github.com/PrefectHQ/fastmcp/pull/3938)
- fix tests that relied on task=True returning error results by [@jlowin](https://github.com/jlowin) in [#3954](https://github.com/PrefectHQ/fastmcp/pull/3954)
- Restore task snapshot via a worker-level dependency by [@chrisguidry](https://github.com/chrisguidry) in [#3945](https://github.com/PrefectHQ/fastmcp/pull/3945)
- Forward backend capabilities in ProxyProvider by [@jlowin](https://github.com/jlowin) in [#3956](https://github.com/PrefectHQ/fastmcp/pull/3956)
- Allow upstream client\_id to be used directly without DCR by [@jlowin](https://github.com/jlowin) in [#3957](https://github.com/PrefectHQ/fastmcp/pull/3957)
- Graceful fallback for unsupported regex patterns in json\_schema\_to\_type by [@jlowin](https://github.com/jlowin) in [#3959](https://github.com/PrefectHQ/fastmcp/pull/3959)
- Revert “Forward backend capabilities in ProxyProvider (#3956)” by [@jlowin](https://github.com/jlowin) in [#3964](https://github.com/PrefectHQ/fastmcp/pull/3964)
- fix: skip stdio subprocess test on Windows CI by [@jlowin](https://github.com/jlowin) in [#3966](https://github.com/PrefectHQ/fastmcp/pull/3966)
- fix: bound \_refresh\_locks with LRU eviction to prevent memory leak by [@jlowin](https://github.com/jlowin) in [#3968](https://github.com/PrefectHQ/fastmcp/pull/3968)
- fix: handle circular JSON Pointer $ref in dereference\_refs by [@lawrence3699](https://github.com/lawrence3699) in [#3896](https://github.com/PrefectHQ/fastmcp/pull/3896)
- fix: honor upstream refresh token expiry in OAuthProxy by [@jlowin](https://github.com/jlowin) in [#3990](https://github.com/PrefectHQ/fastmcp/pull/3990)
- fix: narrow \_token\_validator with isinstance for ty in AzureProvider.from\_b2c by [@jlowin](https://github.com/jlowin) in [#4007](https://github.com/PrefectHQ/fastmcp/pull/4007)
- fix: cancel orphaned session\_task when Client.\_disconnect times out by [@jlowin](https://github.com/jlowin) in [#4011](https://github.com/PrefectHQ/fastmcp/pull/4011)
- fix: preserve @tool metadata in from\_function by [@lawrence3699](https://github.com/lawrence3699) in [#4072](https://github.com/PrefectHQ/fastmcp/pull/4072)
- fix(openapi): keep blank values in parse\_qs (refs #4056) by [@MukundaKatta](https://github.com/MukundaKatta) in [#4076](https://github.com/PrefectHQ/fastmcp/pull/4076)
- Fix #4056: keep blank query values, add token bucket regression test by [@MukundaKatta](https://github.com/MukundaKatta) in [#4069](https://github.com/PrefectHQ/fastmcp/pull/4069)
- fix(ping): exit ping loop cleanly when session stream is closed by [@ashwin153](https://github.com/ashwin153) in [#4087](https://github.com/PrefectHQ/fastmcp/pull/4087)
- Fix sampling from background tasks by [@cuyua9](https://github.com/cuyua9) in [#4068](https://github.com/PrefectHQ/fastmcp/pull/4068)
- Make Docket reentrant; mounted servers enter their own lifespan by [@jlowin](https://github.com/jlowin) in [#4095](https://github.com/PrefectHQ/fastmcp/pull/4095)
- fix(tool\_transform): hoist $defs to schema root when ArgTransform introduces them by [@SarthakB11](https://github.com/SarthakB11) in [#4101](https://github.com/PrefectHQ/fastmcp/pull/4101)
- fix(auth): silence authlib.jose DeprecationWarning at JWT import by [@SarthakB11](https://github.com/SarthakB11) in [#4100](https://github.com/PrefectHQ/fastmcp/pull/4100)
- fix: don’t cache import map in dev apps bundle by [@jlowin](https://github.com/jlowin) in [#4106](https://github.com/PrefectHQ/fastmcp/pull/4106)
- #4084 [Issues] Windows startup crash due to UnicodeDecodeError when l… by [@doneman536](https://github.com/doneman536) in [#4092](https://github.com/PrefectHQ/fastmcp/pull/4092)
- fix: drop exc\_info for expected tool failures, remove unreachable ValidationError by [@sergeykad](https://github.com/sergeykad) in [#4029](https://github.com/PrefectHQ/fastmcp/pull/4029)
- fix: cli option —no-banner is NOT passed to cli but server-spec in-correctly when cli —reload option is specified. by [@itaru2622](https://github.com/itaru2622) in [#4083](https://github.com/PrefectHQ/fastmcp/pull/4083)
- Fix None backend\_\* span attributes on un-renamed proxy components by [@ringerc](https://github.com/ringerc) in [#4109](https://github.com/PrefectHQ/fastmcp/pull/4109)
- Fix OCI Provider issue in 3.x version. Add OCI auth provider example … by [@kiranthakkar](https://github.com/kiranthakkar) in [#4116](https://github.com/PrefectHQ/fastmcp/pull/4116)
- fix(http): terminate active streamable-HTTP transports before lifespan shutdown by [@SarthakB11](https://github.com/SarthakB11) in [#4118](https://github.com/PrefectHQ/fastmcp/pull/4118)

### [​](#docs--3) Docs 📚

- Restructure docs navigation by [@jlowin](https://github.com/jlowin) in [#3951](https://github.com/PrefectHQ/fastmcp/pull/3951)
- docs: standardize ToolAnnotations examples by [@gnanirahulnutakki](https://github.com/gnanirahulnutakki) in [#3952](https://github.com/PrefectHQ/fastmcp/pull/3952)
- Be constructively skeptical of bot reviews on own PRs by [@jlowin](https://github.com/jlowin) in [#3971](https://github.com/PrefectHQ/fastmcp/pull/3971)
- Add UTM params to Horizon docs links by [@aaazzam](https://github.com/aaazzam) in [#4018](https://github.com/PrefectHQ/fastmcp/pull/4018)
- Add a sandboxed-agents deployment guide by [@strawgate](https://github.com/strawgate) in [#4027](https://github.com/PrefectHQ/fastmcp/pull/4027)
- docs: add best practices for custom telemetry spans by [@MukundaKatta](https://github.com/MukundaKatta) in [#4001](https://github.com/PrefectHQ/fastmcp/pull/4001)
- Refresh landing page copy by [@jlowin](https://github.com/jlowin) in [#4043](https://github.com/PrefectHQ/fastmcp/pull/4043)
- Refresh landing page copy by [@jlowin](https://github.com/jlowin) in [#4047](https://github.com/PrefectHQ/fastmcp/pull/4047)
- Add UTM tracking to Horizon links by [@jlowin](https://github.com/jlowin) in [#4064](https://github.com/PrefectHQ/fastmcp/pull/4064)
- docs(integrations): add Pydantic AI FastMCP toolset guide by [@MukundaKatta](https://github.com/MukundaKatta) in [#4070](https://github.com/PrefectHQ/fastmcp/pull/4070)
- docs: fix broken links in Pydantic AI guide by [@jlowin](https://github.com/jlowin) in [#4094](https://github.com/PrefectHQ/fastmcp/pull/4094)

### [​](#dependencies--2) Dependencies 📦

- chore(deps-dev): bump pydantic-monty from 0.0.11 to 0.0.12 by [@dependabot](https://github.com/dependabot) in [#3940](https://github.com/PrefectHQ/fastmcp/pull/3940)
- chore(deps-dev): bump pydantic-monty from 0.0.14 to 0.0.16 by [@dependabot](https://github.com/dependabot) in [#3984](https://github.com/PrefectHQ/fastmcp/pull/3984)

### [​](#other-changes--2) Other Changes 🦾

- fix: Don’t completely hide plain mcp.tool app-only tools by [@owtaylor](https://github.com/owtaylor) in [#4112](https://github.com/PrefectHQ/fastmcp/pull/4112)

## [​](#new-contributors-2) New Contributors

- @gnanirahulnutakki made their first contribution in [#3946](https://github.com/PrefectHQ/fastmcp/pull/3946)
- @lawrence3699 made their first contribution in [#3896](https://github.com/PrefectHQ/fastmcp/pull/3896)
- @carlos-rian made their first contribution in [#3995](https://github.com/PrefectHQ/fastmcp/pull/3995)
- @ZLeventer made their first contribution in [#4026](https://github.com/PrefectHQ/fastmcp/pull/4026)
- @MukundaKatta made their first contribution in [#4001](https://github.com/PrefectHQ/fastmcp/pull/4001)
- @daniel-tsiang made their first contribution in [#4036](https://github.com/PrefectHQ/fastmcp/pull/4036)
- @ashwin153 made their first contribution in [#4087](https://github.com/PrefectHQ/fastmcp/pull/4087)
- @cuyua9 made their first contribution in [#4068](https://github.com/PrefectHQ/fastmcp/pull/4068)
- @taylorwilsdon made their first contribution in [#4091](https://github.com/PrefectHQ/fastmcp/pull/4091)
- @SarthakB11 made their first contribution in [#4101](https://github.com/PrefectHQ/fastmcp/pull/4101)
- @doneman536 made their first contribution in [#4092](https://github.com/PrefectHQ/fastmcp/pull/4092)
- @sergeykad made their first contribution in [#4029](https://github.com/PrefectHQ/fastmcp/pull/4029)
- @ringerc made their first contribution in [#4109](https://github.com/PrefectHQ/fastmcp/pull/4109)

**Full Changelog**: [v3.2.4…v3.3.0](https://github.com/PrefectHQ/fastmcp/compare/v3.2.4...v3.3.0)

[​](#v3-2-4)

v3.2.4

2026-04-14

**[v3.2.4: Patch Me If You Can](https://github.com/PrefectHQ/fastmcp/releases/tag/v3.2.4)**A grab bag of fixes, hardening, and polish. The headline behavior change: background tasks are now scoped to the authorization context rather than the MCP session, so a task survives session churn and stays tied to who started it — a breaking change for anyone relying on the old session-scoped semantics. Plus actual-size validation in `FileUpload`, a Keycloak OAuth provider, automatic parameter descriptions from docstrings, and dozens of schema and sampling fixes.

### [​](#breaking-changes--2) Breaking Changes ⚠️

- Scope tasks to authorization context, not session by [@chrisguidry](https://github.com/chrisguidry) in [#3800](https://github.com/PrefectHQ/fastmcp/pull/3800)

### [​](#enhancements--4) Enhancements ✨

- Bump pydocket>=0.19.0, drop fakeredis pin by [@chrisguidry](https://github.com/chrisguidry) in [#3822](https://github.com/PrefectHQ/fastmcp/pull/3822)
- Add real-world schema crash test (232K schemas from APIs.guru) by [@strawgate](https://github.com/strawgate) in [#3826](https://github.com/PrefectHQ/fastmcp/pull/3826)
- Enable 7 zero-violation ruff rules by [@strawgate](https://github.com/strawgate) in [#3841](https://github.com/PrefectHQ/fastmcp/pull/3841)
- Promote 7 ty rules from ignore to warn by [@strawgate](https://github.com/strawgate) in [#3852](https://github.com/PrefectHQ/fastmcp/pull/3852)
- Replace \_\_\_ with hash-based backend tool routing and per-tool prefab resources by [@jlowin](https://github.com/jlowin) in [#3824](https://github.com/PrefectHQ/fastmcp/pull/3824)
- Enable 4 ruff rules (DTZ, ERA, ISC, INP) and fix 9 violations by [@strawgate](https://github.com/strawgate) in [#3842](https://github.com/PrefectHQ/fastmcp/pull/3842)
- Extract parameter descriptions from docstrings by [@jlowin](https://github.com/jlowin) in [#3872](https://github.com/PrefectHQ/fastmcp/pull/3872)
- ci: speed up schema crash test (CSafeLoader + xdist-safe aggregation) by [@jlowin](https://github.com/jlowin) in [#3873](https://github.com/PrefectHQ/fastmcp/pull/3873)
- test: bump OpenAPI init perf threshold to 200ms for Windows CI by [@jlowin](https://github.com/jlowin) in [#3879](https://github.com/PrefectHQ/fastmcp/pull/3879)
- refactor: unify object-schema conversion through \_object\_schema\_to\_type by [@jlowin](https://github.com/jlowin) in [#3884](https://github.com/PrefectHQ/fastmcp/pull/3884)
- Add Keycloak OAuth Provider for Enterprise Authentication and local dev by [@stephaneberle9](https://github.com/stephaneberle9) in [#1937](https://github.com/PrefectHQ/fastmcp/pull/1937)
- Allow auth providers to override protected resource base URLs by [@aaazzam](https://github.com/aaazzam) in [#3900](https://github.com/PrefectHQ/fastmcp/pull/3900)
- Enable PERF and T20 ruff rules by [@strawgate](https://github.com/strawgate) in [#3845](https://github.com/PrefectHQ/fastmcp/pull/3845)
- Add response\_title and response\_description to ctx.elicit() by [@jlowin](https://github.com/jlowin) in [#3912](https://github.com/PrefectHQ/fastmcp/pull/3912)
- Deprecate ctx.elicit() without response\_type by [@jlowin](https://github.com/jlowin) in [#3916](https://github.com/PrefectHQ/fastmcp/pull/3916)

### [​](#security--4) Security 🔒

- Validate actual base64 data size in FileUpload, not client-reported size by [@strawgate](https://github.com/strawgate) in [#3816](https://github.com/PrefectHQ/fastmcp/pull/3816)
- Stop forwarding inbound HTTP headers to unrelated remote servers by [@jlowin](https://github.com/jlowin) in [#3837](https://github.com/PrefectHQ/fastmcp/pull/3837)
- AuthKit: auto-bind token audience to resource URL (RFC 8707) by [@jlowin](https://github.com/jlowin) in [#3905](https://github.com/PrefectHQ/fastmcp/pull/3905)

### [​](#fixes--4) Fixes 🐞

- Version-check is\_docket\_available() to avoid transitive pydocket crash by [@jlowin](https://github.com/jlowin) in [#3807](https://github.com/PrefectHQ/fastmcp/pull/3807)
- fix: materialize generators before result conversion, handle bytes gracefully by [@strawgate](https://github.com/strawgate) in [#3830](https://github.com/PrefectHQ/fastmcp/pull/3830)
- Fix json\_schema\_to\_type crashes on keywords, boolean schemas, empty enums, and name collisions by [@strawgate](https://github.com/strawgate) in [#3818](https://github.com/PrefectHQ/fastmcp/pull/3818)
- fix: replace `or` with `is not None` checks for config/override merging by [@strawgate](https://github.com/strawgate) in [#3833](https://github.com/PrefectHQ/fastmcp/pull/3833)
- fix: TransformedTool sync fn crash and schema mutation by [@strawgate](https://github.com/strawgate) in [#3823](https://github.com/PrefectHQ/fastmcp/pull/3823)
- fix: cross-provider duplicate detection, error visibility, mask propagation by [@strawgate](https://github.com/strawgate) in [#3827](https://github.com/PrefectHQ/fastmcp/pull/3827)
- fix: don’t pass HTTP kwargs when transport is unspecified by [@strawgate](https://github.com/strawgate) in [#3838](https://github.com/PrefectHQ/fastmcp/pull/3838)
- fix: strip title fields from tool schemas for Gemini 2.5 Flash compatibility by [@strawgate](https://github.com/strawgate) in [#3861](https://github.com/PrefectHQ/fastmcp/pull/3861)
- fix: retry when LLM returns text instead of calling final\_response by [@strawgate](https://github.com/strawgate) in [#3850](https://github.com/PrefectHQ/fastmcp/pull/3850)
- Raise on unhandled content types in sampling handler dispatch chains by [@strawgate](https://github.com/strawgate) in [#3857](https://github.com/PrefectHQ/fastmcp/pull/3857)
- Fix broken code examples in docs by [@strawgate](https://github.com/strawgate) in [#3869](https://github.com/PrefectHQ/fastmcp/pull/3869)
- fix: GoogleGenaiSamplingHandler leaks thought parts and gives unhelpful errors on empty responses by [@strawgate](https://github.com/strawgate) in [#3849](https://github.com/PrefectHQ/fastmcp/pull/3849)
- fix: cap consecutive final\_response validation retries by [@strawgate](https://github.com/strawgate) in [#3851](https://github.com/PrefectHQ/fastmcp/pull/3851)
- Fix test quality issues by [@strawgate](https://github.com/strawgate) in [#3854](https://github.com/PrefectHQ/fastmcp/pull/3854)
- Fix MCP tool on docs welcome page by [@lkiesow](https://github.com/lkiesow) in [#3874](https://github.com/PrefectHQ/fastmcp/pull/3874)
- Fix CIMD clients getting required\_scopes instead of valid\_scopes by [@jlowin](https://github.com/jlowin) in [#3836](https://github.com/PrefectHQ/fastmcp/pull/3836)
- Rename filesystem-provider example dir to avoid mcp/ collision by [@jlowin](https://github.com/jlowin) in [#3878](https://github.com/PrefectHQ/fastmcp/pull/3878)
- fix: drop configurable dedupe from AggregateProvider, always warn by [@jlowin](https://github.com/jlowin) in [#3877](https://github.com/PrefectHQ/fastmcp/pull/3877)
- fix: resolve list[dict] return type producing Root() instead of dicts by [@KeWang0622](https://github.com/KeWang0622) in [#3880](https://github.com/PrefectHQ/fastmcp/pull/3880)
- fix: strip titles from bare-metadata nodes (Gemini 2.5 Flash) by [@jlowin](https://github.com/jlowin) in [#3881](https://github.com/PrefectHQ/fastmcp/pull/3881)
- Fix wildcard resource template params in mounted servers by [@jlowin](https://github.com/jlowin) in [#3899](https://github.com/PrefectHQ/fastmcp/pull/3899)
- Harden forced client disconnect cleanup by [@vonbai](https://github.com/vonbai) in [#3885](https://github.com/PrefectHQ/fastmcp/pull/3885)
- fix: elicitation scalar return, resource auto-serialization, Client.new() state, prompt errors by [@strawgate](https://github.com/strawgate) in [#3859](https://github.com/PrefectHQ/fastmcp/pull/3859)
- fix: task.wait() hangs indefinitely when task enters input\_required by [@mrishav](https://github.com/mrishav) in [#3798](https://github.com/PrefectHQ/fastmcp/pull/3798)
- Fix RetryMiddleware not retrying tool errors by [@strawgate](https://github.com/strawgate) in [#3858](https://github.com/PrefectHQ/fastmcp/pull/3858)
- Stop pydantic 2.13 from leaking \_WrappedResult docstring into tool output schemas by [@jlowin](https://github.com/jlowin) in [#3918](https://github.com/PrefectHQ/fastmcp/pull/3918)

### [​](#docs--4) Docs 📚

- Note generate-notes API in release workflow docs by [@jlowin](https://github.com/jlowin) in [#3806](https://github.com/PrefectHQ/fastmcp/pull/3806)
- docs: require agents to respect DNM markers on PRs by [@jlowin](https://github.com/jlowin) in [#3871](https://github.com/PrefectHQ/fastmcp/pull/3871)
- docs: add uv-managed dependencies and uvx examples to mcp-json configuration by [@vincent067](https://github.com/vincent067) in [#3843](https://github.com/PrefectHQ/fastmcp/pull/3843)
- docs: link fastmcp-keycloak-local companion project from Keycloak integration page by [@stephaneberle9](https://github.com/stephaneberle9) in [#3904](https://github.com/PrefectHQ/fastmcp/pull/3904)
- Overhaul apps docs by [@jlowin](https://github.com/jlowin) in [#3915](https://github.com/PrefectHQ/fastmcp/pull/3915)

### [​](#dependencies--3) Dependencies 📦

- chore(deps): bump extractions/setup-just from 3 to 4 by [@dependabot](https://github.com/dependabot) in [#3863](https://github.com/PrefectHQ/fastmcp/pull/3863)
- chore(deps): bump astral-sh/setup-uv from 6 to 7 by [@dependabot](https://github.com/dependabot) in [#3865](https://github.com/PrefectHQ/fastmcp/pull/3865)
- chore(deps): bump actions/checkout from 4 to 6 by [@dependabot](https://github.com/dependabot) in [#3864](https://github.com/PrefectHQ/fastmcp/pull/3864)
- chore(deps-dev): bump pydantic-monty from 0.0.9 to 0.0.10 by [@dependabot](https://github.com/dependabot) in [#3809](https://github.com/PrefectHQ/fastmcp/pull/3809)
- chore(deps): bump the uv group across 2 directories with 1 update by [@dependabot](https://github.com/dependabot) in [#3913](https://github.com/PrefectHQ/fastmcp/pull/3913)

## [​](#new-contributors-3) New Contributors

- @lkiesow made their first contribution in [#3874](https://github.com/PrefectHQ/fastmcp/pull/3874)
- @KeWang0622 made their first contribution in [#3880](https://github.com/PrefectHQ/fastmcp/pull/3880)
- @vonbai made their first contribution in [#3885](https://github.com/PrefectHQ/fastmcp/pull/3885)

**Full Changelog**: [v3.2.3…v3.2.4](https://github.com/PrefectHQ/fastmcp/compare/v3.2.3...v3.2.4)

[​](#v3-2-3)

v3.2.3

2026-04-09

**[v3.2.3: Redis or Not](https://github.com/PrefectHQ/fastmcp/releases/tag/v3.2.3)**A stopgap pin: fakeredis 2.35.0 shipped an undocumented rename that broke pydocket’s `memory://` backend, causing `fastmcp[tasks]` installs to fail at startup with an `ImportError`. This pins `fakeredis<2.35.0` in the `tasks` extra until a fixed pydocket ships.

### [​](#fixes--5) Fixes 🐞

- Pin `fakeredis<2.35.0` in tasks extra by [@jlowin](https://github.com/jlowin) in [#3804](https://github.com/PrefectHQ/fastmcp/pull/3804)

### [​](#docs--5) Docs 📚

- Document session state isolation across mount boundaries by [@jlowin](https://github.com/jlowin) in [#3801](https://github.com/PrefectHQ/fastmcp/pull/3801)

**Full Changelog**: [v3.2.2…v3.2.3](https://github.com/PrefectHQ/fastmcp/compare/v3.2.2...v3.2.3)

[​](#v3-2-2)

v3.2.2

2026-04-09

**[v3.2.2: Audience Appreciation](https://github.com/PrefectHQ/fastmcp/releases/tag/v3.2.2)**Fixes the Azure audience regression from 3.2.1: validation switched from `client_id` to `identifier_uri`, which fixed custom Application ID URIs but broke the default case where Azure AD v2 tokens set `aud` to the bare client ID GUID. Both formats are now accepted.

### [​](#fixes--6) Fixes 🐞

- fix: accept both client\_id and identifier\_uri as Azure audience by [@jlowin](https://github.com/jlowin) in [#3797](https://github.com/PrefectHQ/fastmcp/pull/3797)

### [​](#dependencies--4) Dependencies 📦

- chore(deps): bump the uv group across 2 directories with 1 update by [@dependabot](https://github.com/dependabot) in [#3795](https://github.com/PrefectHQ/fastmcp/pull/3795)

**Full Changelog**: [v3.2.1…v3.2.2](https://github.com/PrefectHQ/fastmcp/compare/v3.2.1...v3.2.2)

[​](#v3-2-1)

v3.2.1

2026-04-08

**[v3.2.1: Audience Participation](https://github.com/PrefectHQ/fastmcp/releases/tag/v3.2.1)**A patch focused on auth-provider audience validation. Cognito tokens now validate on `client_id` (they carry no `aud`), Azure honors the `identifier_uri` parameter for Entra v2.0 tokens, and consent cookies are LRU-capped to prevent unbounded growth past reverse proxy header limits. Also fixes OpenAPI 3.0 `nullable` fields leaking into tool input schemas and server-variable substitution in base URLs.

### [​](#breaking-changes--3) Breaking Changes ⚠️

- fix(google): use sub (user ID) for client\_id instead of aud (app ID) by [@shigechika](https://github.com/shigechika) in [#3722](https://github.com/PrefectHQ/fastmcp/pull/3722)
- fix: remove CSP from tool metadata, keep on resource only by [@jlowin](https://github.com/jlowin) in [#3754](https://github.com/PrefectHQ/fastmcp/pull/3754)

### [​](#enhancements--5) Enhancements ✨

- [codex] Add FastMCP docs telemetry by [@aaazzam](https://github.com/aaazzam) in [#3727](https://github.com/PrefectHQ/fastmcp/pull/3727)
- chore: split SDK navigation into standalone $ref file by [@jlowin](https://github.com/jlowin) in [#3773](https://github.com/PrefectHQ/fastmcp/pull/3773)
- fix: bump ty to >=0.0.29 and suppress new false positives by [@jlowin](https://github.com/jlowin) in [#3790](https://github.com/PrefectHQ/fastmcp/pull/3790)

### [​](#fixes--7) Fixes 🐞

- fix: use explicit None checks for JWT exp validation by [@jlowin](https://github.com/jlowin) in [#3724](https://github.com/PrefectHQ/fastmcp/pull/3724)
- Unify background task context forwarding, fix concurrent dependency bugs by [@chrisguidry](https://github.com/chrisguidry) in [#3710](https://github.com/PrefectHQ/fastmcp/pull/3710)
- fix: add proxy timeouts and modernize networking in apps dev by [@mateeaaa](https://github.com/mateeaaa) in [#3741](https://github.com/PrefectHQ/fastmcp/pull/3741)
- fix: ResponseLimitingMiddleware no longer breaks outputSchema tools by [@jlowin](https://github.com/jlowin) in [#3756](https://github.com/PrefectHQ/fastmcp/pull/3756)
- fix: substitute server variable defaults when building base URL from OpenAPI spec by [@mrishav](https://github.com/mrishav) in [#3770](https://github.com/PrefectHQ/fastmcp/pull/3770)
- fix: FastAPI TestClient compatibility and lifespan re-initialization by [@kvdhanush06](https://github.com/kvdhanush06) in [#3736](https://github.com/PrefectHQ/fastmcp/pull/3736)
- fix: propagate upstream\_claims in load\_access\_token by [@kvdhanush06](https://github.com/kvdhanush06) in [#3750](https://github.com/PrefectHQ/fastmcp/pull/3750)
- Remove deprecated asyncio.iscoroutinefunction fallback by [@kaiisfree](https://github.com/kaiisfree) in [#3767](https://github.com/PrefectHQ/fastmcp/pull/3767)
- fix: changeable allowed\_client\_redirect\_uris on OAuthProxy by [@fengarix](https://github.com/fengarix) in [#3772](https://github.com/PrefectHQ/fastmcp/pull/3772)
- fix: broken link in changelog by [@jlowin](https://github.com/jlowin) in [#3775](https://github.com/PrefectHQ/fastmcp/pull/3775)
- fix(docs): correct FastMCP tool name in welcome docs by [@buyua9](https://github.com/buyua9) in [#3781](https://github.com/PrefectHQ/fastmcp/pull/3781)
- fix: cap consent cookie size to prevent header overflow by [@jlowin](https://github.com/jlowin) in [#3784](https://github.com/PrefectHQ/fastmcp/pull/3784)
- Fix boolean property schemas in JSON Schema parsing by [@jlowin](https://github.com/jlowin) in [#3785](https://github.com/PrefectHQ/fastmcp/pull/3785)
- Fix OpenAPI 3.0 nullable fields in tool input schemas by [@kvdhanush06](https://github.com/kvdhanush06) in [#3768](https://github.com/PrefectHQ/fastmcp/pull/3768)
- fix: Cognito token verification checks client\_id instead of aud by [@jlowin](https://github.com/jlowin) in [#3786](https://github.com/PrefectHQ/fastmcp/pull/3786)
- fix: use identifier\_uri as audience for Azure token validation by [@jlowin](https://github.com/jlowin) in [#3787](https://github.com/PrefectHQ/fastmcp/pull/3787)
- Harden client tool result error handling by [@aimable100](https://github.com/aimable100) in [#3778](https://github.com/PrefectHQ/fastmcp/pull/3778)

### [​](#docs--6) Docs 📚

- Github integraiton documentation fix: use result.data otherwise CallToolResult not scriptable by [@c4jquick](https://github.com/c4jquick) in [#3753](https://github.com/PrefectHQ/fastmcp/pull/3753)
- chore: split v2 docs navigation into separate file by [@jlowin](https://github.com/jlowin) in [#3762](https://github.com/PrefectHQ/fastmcp/pull/3762)
- docs: document forward\_resource parameter on OAuthProxy by [@jlowin](https://github.com/jlowin) in [#3788](https://github.com/PrefectHQ/fastmcp/pull/3788)

### [​](#examples-&-contrib-) Examples & Contrib 💡

- fix: boolean false values dropped in form submissions by [@jlowin](https://github.com/jlowin) in [#3776](https://github.com/PrefectHQ/fastmcp/pull/3776)

### [​](#dependencies--5) Dependencies 📦

- chore(deps): bump fastmcp from 3.1.1 to 3.2.0 in /examples/testing\_demo in the uv group across 1 directory by [@dependabot](https://github.com/dependabot) in [#3728](https://github.com/PrefectHQ/fastmcp/pull/3728)
- chore(deps): bump anthropic from 0.86.0 to 0.87.0 in the uv group across 1 directory by [@dependabot](https://github.com/dependabot) in [#3742](https://github.com/PrefectHQ/fastmcp/pull/3742)

## [​](#new-contributors-4) New Contributors

- @c4jquick made their first contribution in [#3753](https://github.com/PrefectHQ/fastmcp/pull/3753)
- @mateeaaa made their first contribution in [#3741](https://github.com/PrefectHQ/fastmcp/pull/3741)
- @mrishav made their first contribution in [#3770](https://github.com/PrefectHQ/fastmcp/pull/3770)
- @kvdhanush06 made their first contribution in [#3736](https://github.com/PrefectHQ/fastmcp/pull/3736)
- @kaiisfree made their first contribution in [#3767](https://github.com/PrefectHQ/fastmcp/pull/3767)
- @fengarix made their first contribution in [#3772](https://github.com/PrefectHQ/fastmcp/pull/3772)
- @buyua9 made their first contribution in [#3781](https://github.com/PrefectHQ/fastmcp/pull/3781)
- @aimable100 made their first contribution in [#3778](https://github.com/PrefectHQ/fastmcp/pull/3778)

**Full Changelog**: [v3.2.0…v3.2.1](https://github.com/PrefectHQ/fastmcp/compare/v3.2.0...v3.2.1)

[​](#v3-2-0)

v3.2.0

2026-03-30

**[v3.2.0: Show Don’t Tool](https://github.com/PrefectHQ/fastmcp/releases/tag/v3.2.0)**FastMCP 3.2 is the Apps release: your tools can now return interactive UIs — charts, dashboards, forms, maps — rendered right inside the conversation. `FastMCPApp` separates the tools the LLM sees from the backend tools the UI calls, five built-in providers (FileUpload, Approval, Choice, FormInput, GenerativeUI) cover common interaction patterns, and `fastmcp dev apps` gives you a browser preview. The release also lands a significant security hardening pass across SSRF/path-traversal, JWT algorithm restrictions, OAuth scope enforcement, and CSRF.

### [​](#new-features--3) New Features 🎉

- Add FastMCPApp — a Provider for composable MCP applications by [@jlowin](https://github.com/jlowin) in [#3385](https://github.com/PrefectHQ/fastmcp/pull/3385)
- Add fastmcp dev apps command with browser UI preview by [@jlowin](https://github.com/jlowin) in [#3489](https://github.com/PrefectHQ/fastmcp/pull/3489)
- Add GenerativeUI provider, bump prefab-ui 0.14.0 by [@jlowin](https://github.com/jlowin) in [#3647](https://github.com/PrefectHQ/fastmcp/pull/3647)
- Add FileUpload provider by [@jlowin](https://github.com/jlowin) in [#3669](https://github.com/PrefectHQ/fastmcp/pull/3669)
- Add Approval and Choice providers by [@jlowin](https://github.com/jlowin) in [#3686](https://github.com/PrefectHQ/fastmcp/pull/3686)
- Add FormInput provider, bump prefab-ui to 0.15.0 by [@jlowin](https://github.com/jlowin) in [#3687](https://github.com/PrefectHQ/fastmcp/pull/3687)

### [​](#breaking-changes--4) Breaking Changes ⚠️

- Route app tool calls via \_\_\_-prefixed names by [@jlowin](https://github.com/jlowin) in [#3667](https://github.com/PrefectHQ/fastmcp/pull/3667)

### [​](#enhancements--6) Enhancements ✨

- feat: add `--config-path` flag to claude-desktop install command by [@Sumanshu-Nankana](https://github.com/Sumanshu-Nankana) in [#3380](https://github.com/PrefectHQ/fastmcp/pull/3380)
- Support ImageContent and AudioContent in Message class by [@ericrobinson-indeed](https://github.com/ericrobinson-indeed) in [#3396](https://github.com/PrefectHQ/fastmcp/pull/3396)
- Deprecate PromptToolMiddleware and ResourceToolMiddleware by [@jlowin](https://github.com/jlowin) in [#3389](https://github.com/PrefectHQ/fastmcp/pull/3389)
- Block HS\* algorithms when JWTVerifier is configured with JWKS by [@jlowin](https://github.com/jlowin) in [#3419](https://github.com/PrefectHQ/fastmcp/pull/3419)
- Remove prek from Marvin workflows by [@jlowin](https://github.com/jlowin) in [#3444](https://github.com/PrefectHQ/fastmcp/pull/3444)
- Add dependency version compatibility guidance to code-review skill by [@jlowin](https://github.com/jlowin) in [#3475](https://github.com/PrefectHQ/fastmcp/pull/3475)
- Remove “good first issue” label by [@jlowin](https://github.com/jlowin) in [#3482](https://github.com/PrefectHQ/fastmcp/pull/3482)
- Cache component lists in ProxyProvider by [@jlowin](https://github.com/jlowin) in [#3479](https://github.com/PrefectHQ/fastmcp/pull/3479)
- Support logging/setLevel and add client\_log\_level by [@jlowin](https://github.com/jlowin) in [#3491](https://github.com/PrefectHQ/fastmcp/pull/3491)
- Propagate x-fastmcp-wrap-result in tool result \_meta by [@jlowin](https://github.com/jlowin) in [#3490](https://github.com/PrefectHQ/fastmcp/pull/3490)
- feat(auth): add external\_consent param to suppress misleading warning by [@mtthidoteu](https://github.com/mtthidoteu) in [#3473](https://github.com/PrefectHQ/fastmcp/pull/3473)
- Add `verify` parameter for SSL certificate configuration by [@jlowin](https://github.com/jlowin) in [#3487](https://github.com/PrefectHQ/fastmcp/pull/3487)
- Expose minimum\_check\_interval, reduce task pickup latency by [@jlowin](https://github.com/jlowin) in [#3500](https://github.com/PrefectHQ/fastmcp/pull/3500)
- Fix test timeouts, suppress deprecation warnings, speed up auth tests by [@jlowin](https://github.com/jlowin) in [#3504](https://github.com/PrefectHQ/fastmcp/pull/3504)
- Auto-close upgrade check issue when build passes by [@jlowin](https://github.com/jlowin) in [#3505](https://github.com/PrefectHQ/fastmcp/pull/3505)
- feat: make upstream\_client\_secret optional in OAuthProxy by [@jlowin](https://github.com/jlowin) in [#3486](https://github.com/PrefectHQ/fastmcp/pull/3486)
- Add security label to triage workflow and release notes by [@jlowin](https://github.com/jlowin) in [#3516](https://github.com/PrefectHQ/fastmcp/pull/3516)
- Claude/review contributor guidelines by [@jlowin](https://github.com/jlowin) in [#3517](https://github.com/PrefectHQ/fastmcp/pull/3517)
- pin pydantic-monty to 0.0.8 by [@jlowin](https://github.com/jlowin) in [#3539](https://github.com/PrefectHQ/fastmcp/pull/3539)
- Support ImageContent and AudioContent in sampling handlers by [@jlowin](https://github.com/jlowin) in [#3550](https://github.com/PrefectHQ/fastmcp/pull/3550)
- Graceful degradation for multi-server proxy setup by [@jlowin](https://github.com/jlowin) in [#3546](https://github.com/PrefectHQ/fastmcp/pull/3546)
- Extract TokenCache utility, add caching to GitHubTokenVerifier by [@jlowin](https://github.com/jlowin) in [#3547](https://github.com/PrefectHQ/fastmcp/pull/3547)
- Add review-pr skill for Codex bot workflow by [@jlowin](https://github.com/jlowin) in [#3552](https://github.com/PrefectHQ/fastmcp/pull/3552)
- Add MCP message inspector to dev apps UI by [@jlowin](https://github.com/jlowin) in [#3570](https://github.com/PrefectHQ/fastmcp/pull/3570)
- Comprehensive MCP Apps docs, string CallTool resolution by [@jlowin](https://github.com/jlowin) in [#3575](https://github.com/PrefectHQ/fastmcp/pull/3575)
- Replace UUID global keys with (app\_name, tool\_name) registry by [@jlowin](https://github.com/jlowin) in [#3585](https://github.com/PrefectHQ/fastmcp/pull/3585)
- Route app tool calls through provider chain by [@jlowin](https://github.com/jlowin) in [#3587](https://github.com/PrefectHQ/fastmcp/pull/3587)
- Dev apps: show more/less for long tool descriptions by [@jlowin](https://github.com/jlowin) in [#3600](https://github.com/PrefectHQ/fastmcp/pull/3600)
- Apps Phase 1: docs, examples, app-only tool filtering by [@jlowin](https://github.com/jlowin) in [#3593](https://github.com/PrefectHQ/fastmcp/pull/3593)
- Forward enable\_cimd to OAuthProxy in all provider subclasses by [@jlowin](https://github.com/jlowin) in [#3608](https://github.com/PrefectHQ/fastmcp/pull/3608)
- Tune too-long triage heuristic by [@jlowin](https://github.com/jlowin) in [#3610](https://github.com/PrefectHQ/fastmcp/pull/3610)
- Update ty ignore comments for 0.0.25 compatibility by [@jlowin](https://github.com/jlowin) in [#3614](https://github.com/PrefectHQ/fastmcp/pull/3614)
- Move app modules to fastmcp.apps package by [@jlowin](https://github.com/jlowin) in [#3616](https://github.com/PrefectHQ/fastmcp/pull/3616)
- Tighten too-long heuristic for design-document issues by [@jlowin](https://github.com/jlowin) in [#3620](https://github.com/PrefectHQ/fastmcp/pull/3620)
- Run MCP conformance tests by [@strawgate](https://github.com/strawgate) in [#3628](https://github.com/PrefectHQ/fastmcp/pull/3628)
- Add PrefabAppConfig for customizable Prefab tool setup by [@jlowin](https://github.com/jlowin) in [#3648](https://github.com/PrefectHQ/fastmcp/pull/3648)
- Clean error when dev apps ports are in use by [@jlowin](https://github.com/jlowin) in [#3658](https://github.com/PrefectHQ/fastmcp/pull/3658)
- Add Clerk OAuth provider by [@mostafa6765](https://github.com/mostafa6765) in [#3677](https://github.com/PrefectHQ/fastmcp/pull/3677)
- Add interactive map example with geocoding by [@jlowin](https://github.com/jlowin) in [#3702](https://github.com/PrefectHQ/fastmcp/pull/3702)
- Bump pydantic-monty to 0.0.9 by [@jlowin](https://github.com/jlowin) in [#3707](https://github.com/PrefectHQ/fastmcp/pull/3707)
- Add forward\_resource flag to OAuthProxy by [@jlowin](https://github.com/jlowin) in [#3711](https://github.com/PrefectHQ/fastmcp/pull/3711)

### [​](#security--5) Security 🔒

- fix: enforce per-tool auth checks in sampling tool wrapper by [@jlowin](https://github.com/jlowin) in [#3494](https://github.com/PrefectHQ/fastmcp/pull/3494)
- fix: handle re.error from malformed URI templates by [@jlowin](https://github.com/jlowin) in [#3501](https://github.com/PrefectHQ/fastmcp/pull/3501)
- fix: reject empty/OIDC-only required\_scopes in AzureProvider by [@jlowin](https://github.com/jlowin) in [#3503](https://github.com/PrefectHQ/fastmcp/pull/3503)
- fix: restrict $ref resolution to local refs only (SSRF/LFI) by [@jlowin](https://github.com/jlowin) in [#3502](https://github.com/PrefectHQ/fastmcp/pull/3502)
- fix: URL-encode path params to prevent SSRF/path traversal (GHSA-vv7q-7jx5-f767) by [@jlowin](https://github.com/jlowin) in [#3507](https://github.com/PrefectHQ/fastmcp/pull/3507)
- fix: prevent path traversal in skill download by [@jlowin](https://github.com/jlowin) in [#3493](https://github.com/PrefectHQ/fastmcp/pull/3493)
- fix: prefer IdP-granted scopes over client-requested scopes in OAuthProxy by [@jlowin](https://github.com/jlowin) in [#3492](https://github.com/PrefectHQ/fastmcp/pull/3492)
- fix: remove forced follow\_redirects from httpx\_client\_factory calls by [@jlowin](https://github.com/jlowin) in [#3496](https://github.com/PrefectHQ/fastmcp/pull/3496)
- Bump PyJWT >= 2.12.0 (CVE-2026-32597) by [@jlowin](https://github.com/jlowin) in [#3515](https://github.com/PrefectHQ/fastmcp/pull/3515)
- Drop diskcache from examples/testing\_demo lockfile (CVE-2025-69872) by [@jlowin](https://github.com/jlowin) in [#3518](https://github.com/PrefectHQ/fastmcp/pull/3518)
- fix: CSRF double-submit cookie check in consent flow by [@jlowin](https://github.com/jlowin) in [#3519](https://github.com/PrefectHQ/fastmcp/pull/3519)
- fix: validate server names in install commands by [@jlowin](https://github.com/jlowin) in [#3522](https://github.com/PrefectHQ/fastmcp/pull/3522)
- fix: reject refresh tokens used as Bearer access tokens by [@jlowin](https://github.com/jlowin) in [#3524](https://github.com/PrefectHQ/fastmcp/pull/3524)
- fix: route ResourcesAsTools/PromptsAsTools through server middleware by [@jlowin](https://github.com/jlowin) in [#3495](https://github.com/PrefectHQ/fastmcp/pull/3495)

### [​](#fixes--8) Fixes 🐞

- Update docs banner and fix mobile layout by [@jlowin](https://github.com/jlowin) in [#3370](https://github.com/PrefectHQ/fastmcp/pull/3370)
- Remove form-action from consent CSP, forward consent\_csp\_policy in providers by [@jlowin](https://github.com/jlowin) in [#3372](https://github.com/PrefectHQ/fastmcp/pull/3372)
- Fix resource templates with query params on mounted servers by [@jlowin](https://github.com/jlowin) in [#3373](https://github.com/PrefectHQ/fastmcp/pull/3373)
- Increase uv transport test timeout for CI cold starts by [@jlowin](https://github.com/jlowin) in [#3376](https://github.com/PrefectHQ/fastmcp/pull/3376)
- Fix stale catalog in CodeMode execute by [@jlowin](https://github.com/jlowin) in [#3375](https://github.com/PrefectHQ/fastmcp/pull/3375)
- Deduplicate versioned tools in CatalogTransform catalog by [@jlowin](https://github.com/jlowin) in [#3374](https://github.com/PrefectHQ/fastmcp/pull/3374)
- Fix ty 0.0.20 compatibility by [@jlowin](https://github.com/jlowin) in [#3377](https://github.com/PrefectHQ/fastmcp/pull/3377)
- Forward scopes\_supported through RemoteAuthProvider subclasses by [@jlowin](https://github.com/jlowin) in [#3388](https://github.com/PrefectHQ/fastmcp/pull/3388)
- Enforce token scopes in WorkOS verifier to prevent scope bypass by [@jlowin](https://github.com/jlowin) in [#3407](https://github.com/PrefectHQ/fastmcp/pull/3407)
- Bind Discord token verification to configured client\_id by [@jlowin](https://github.com/jlowin) in [#3405](https://github.com/PrefectHQ/fastmcp/pull/3405)
- Return after `McpError` in initialization middleware to prevent fallthrough by [@jlowin](https://github.com/jlowin) in [#3413](https://github.com/PrefectHQ/fastmcp/pull/3413)
- Escape client\_id in OAuth consent advanced details by [@jlowin](https://github.com/jlowin) in [#3418](https://github.com/PrefectHQ/fastmcp/pull/3418)
- Bound client auto-pagination loops to prevent unbounded list fetches by [@jlowin](https://github.com/jlowin) in [#3411](https://github.com/PrefectHQ/fastmcp/pull/3411)
- Raise ValueError for invalid boolean query params in resource templates by [@jlowin](https://github.com/jlowin) in [#3434](https://github.com/PrefectHQ/fastmcp/pull/3434)
- Validate workspace path is a directory in cursor install by [@jlowin](https://github.com/jlowin) in [#3435](https://github.com/PrefectHQ/fastmcp/pull/3435)
- Validate version metadata to reject non-scalar types by [@jlowin](https://github.com/jlowin) in [#3437](https://github.com/PrefectHQ/fastmcp/pull/3437)
- Bind AWS Cognito token verification to configured app client by [@jlowin](https://github.com/jlowin) in [#3406](https://github.com/PrefectHQ/fastmcp/pull/3406)
- Avoid stale context leakage when proxying with an already‑connected ProxyClient by [@jlowin](https://github.com/jlowin) in [#3408](https://github.com/PrefectHQ/fastmcp/pull/3408)
- Prevent skills manifests from hashing files outside the skill directory by [@jlowin](https://github.com/jlowin) in [#3410](https://github.com/PrefectHQ/fastmcp/pull/3410)
- Harden fastmcp metadata parsing in proxy paths by [@jlowin](https://github.com/jlowin) in [#3412](https://github.com/PrefectHQ/fastmcp/pull/3412)
- Re-hash response caching keys to avoid persisting raw request input by [@jlowin](https://github.com/jlowin) in [#3414](https://github.com/PrefectHQ/fastmcp/pull/3414)
- Handle Windows npx detection when npx.cmd is missing by [@jlowin](https://github.com/jlowin) in [#3416](https://github.com/PrefectHQ/fastmcp/pull/3416)
- Guard OAuth callback result from post-completion overwrites by [@jlowin](https://github.com/jlowin) in [#3417](https://github.com/PrefectHQ/fastmcp/pull/3417)
- Fix tool argument rename collisions with passthrough params by [@jlowin](https://github.com/jlowin) in [#3431](https://github.com/PrefectHQ/fastmcp/pull/3431)
- Guard default progress handler against total=0 notifications by [@jlowin](https://github.com/jlowin) in [#3432](https://github.com/PrefectHQ/fastmcp/pull/3432)
- Fix get\_\* returning None when latest version is disabled by [@jlowin](https://github.com/jlowin) in [#3439](https://github.com/PrefectHQ/fastmcp/pull/3439)
- Fix server lifespan overlap teardown by [@jlowin](https://github.com/jlowin) in [#3415](https://github.com/PrefectHQ/fastmcp/pull/3415)
- Fix $ref output schema object detection regression by [@jlowin](https://github.com/jlowin) in [#3420](https://github.com/PrefectHQ/fastmcp/pull/3420)
- Preserve kw-only defaults when rebuilding functions for resolved annotations by [@jlowin](https://github.com/jlowin) in [#3429](https://github.com/PrefectHQ/fastmcp/pull/3429)
- Redact sensitive headers in OpenAPI provider debug logging by [@jlowin](https://github.com/jlowin) in [#3436](https://github.com/PrefectHQ/fastmcp/pull/3436)
- Fix async partial callables rejected by iscoroutinefunction by [@jlowin](https://github.com/jlowin) in [#3438](https://github.com/PrefectHQ/fastmcp/pull/3438)
- Block insecure HS\* JWT verification with JWKS/public keys by [@jlowin](https://github.com/jlowin) in [#3430](https://github.com/PrefectHQ/fastmcp/pull/3430)
- Sanitize untrusted output in `fastmcp list` and `fastmcp call` by [@jlowin](https://github.com/jlowin) in [#3409](https://github.com/PrefectHQ/fastmcp/pull/3409)
- fix: propagate `version` to components in FileSystemProvider by [@martimfasantos](https://github.com/martimfasantos) in [#3458](https://github.com/PrefectHQ/fastmcp/pull/3458)
- fix: use intent-based flag for OIDC scope patch in load\_access\_token by [@voidborne-d](https://github.com/voidborne-d) in [#3465](https://github.com/PrefectHQ/fastmcp/pull/3465)
- Set readOnlyHint=True on ResourcesAsTools generated tools by [@jlowin](https://github.com/jlowin) in [#3476](https://github.com/PrefectHQ/fastmcp/pull/3476)
- fix: normalize Google scope shorthands and surface valid\_scopes by [@jlowin](https://github.com/jlowin) in [#3477](https://github.com/PrefectHQ/fastmcp/pull/3477)
- fix: resolve ty 0.0.23 type-checking errors by [@jlowin](https://github.com/jlowin) in [#3481](https://github.com/PrefectHQ/fastmcp/pull/3481)
- fix: shield lifespan teardown from cancellation by [@jlowin](https://github.com/jlowin) in [#3480](https://github.com/PrefectHQ/fastmcp/pull/3480)
- fix: forward custom\_route endpoints from mounted servers by [@voidborne-d](https://github.com/voidborne-d) in [#3462](https://github.com/PrefectHQ/fastmcp/pull/3462)
- fix: use dynamic version in CLI help text instead of hardcoded 2.0 by [@saschabuehrle](https://github.com/saschabuehrle) in [#3456](https://github.com/PrefectHQ/fastmcp/pull/3456)
- Fix Monty 0.0.8 compatibility by [@hkc5](https://github.com/hkc5) in [#3468](https://github.com/PrefectHQ/fastmcp/pull/3468)
- Fix task test teardown hanging 5s per test by [@jlowin](https://github.com/jlowin) in [#3499](https://github.com/PrefectHQ/fastmcp/pull/3499)
- fix: validate workspace path is a directory before cursor install by [@nightcityblade](https://github.com/nightcityblade) in [#3440](https://github.com/PrefectHQ/fastmcp/pull/3440)
- Treat `refresh_expires_in=0` as missing, fall back to 30-day default by [@jlowin](https://github.com/jlowin) in [#3514](https://github.com/PrefectHQ/fastmcp/pull/3514)
- fix: use raw strings for regex in pytest.raises match by [@jlowin](https://github.com/jlowin) in [#3523](https://github.com/PrefectHQ/fastmcp/pull/3523)
- fix: resolve Pyright “Module is not callable” on @tool, @resource, @prompt decorators by [@jlowin](https://github.com/jlowin) in [#3540](https://github.com/PrefectHQ/fastmcp/pull/3540)
- fix: flaky KEY\_PREFIX warning test in lowest-direct deps by [@jlowin](https://github.com/jlowin) in [#3549](https://github.com/PrefectHQ/fastmcp/pull/3549)
- fix: suppress output schema for ToolResult subclass annotations by [@jlowin](https://github.com/jlowin) in [#3548](https://github.com/PrefectHQ/fastmcp/pull/3548)
- Bump anthropic minimum to 0.48.0 by [@jlowin](https://github.com/jlowin) in [#3553](https://github.com/PrefectHQ/fastmcp/pull/3553)
- Update startup banner deploy URL to Prefect Horizon by [@zzstoatzz](https://github.com/zzstoatzz) in [#3557](https://github.com/PrefectHQ/fastmcp/pull/3557)
- fix: increase sleep duration in proxy cache tests by [@strawgate](https://github.com/strawgate) in [#3567](https://github.com/PrefectHQ/fastmcp/pull/3567)
- fix: store absolute token expiry to prevent stale expires\_in on reload by [@jlowin](https://github.com/jlowin) in [#3572](https://github.com/PrefectHQ/fastmcp/pull/3572)
- fix: preserve tool properties named ‘title’ during schema compression by [@jlowin](https://github.com/jlowin) in [#3582](https://github.com/PrefectHQ/fastmcp/pull/3582)
- Add `encoding` parameter to `FileResource` by [@shulkx](https://github.com/shulkx) in [#3580](https://github.com/PrefectHQ/fastmcp/pull/3580)
- Transparently refresh upstream token in OAuthProxy.load\_access\_token() by [@jlowin](https://github.com/jlowin) in [#3584](https://github.com/PrefectHQ/fastmcp/pull/3584)
- Fix loopback redirect URI port matching per RFC 8252 §7.3 by [@radoshi](https://github.com/radoshi) in [#3589](https://github.com/PrefectHQ/fastmcp/pull/3589)
- Fix app tool routing: visibility check and middleware propagation by [@jlowin](https://github.com/jlowin) in [#3591](https://github.com/PrefectHQ/fastmcp/pull/3591)
- Fix query parameter serialization to respect OpenAPI explode setting by [@jlowin](https://github.com/jlowin) in [#3595](https://github.com/PrefectHQ/fastmcp/pull/3595)
- Fix dev apps form: union types, textarea support, JSON parsing by [@jlowin](https://github.com/jlowin) in [#3597](https://github.com/PrefectHQ/fastmcp/pull/3597)
- Respect OpenAPI content type in request body serialization by [@jlowin](https://github.com/jlowin) in [#3611](https://github.com/PrefectHQ/fastmcp/pull/3611)
- fix(google): replace deprecated /oauth2/v1/tokeninfo with /oauth2/v3/userinfo by [@shigechika](https://github.com/shigechika) in [#3603](https://github.com/PrefectHQ/fastmcp/pull/3603)
- fix: resolve EntraOBOToken dependency injection through MultiAuth by [@jer805](https://github.com/jer805) in [#3609](https://github.com/PrefectHQ/fastmcp/pull/3609)
- fix: filesystem provider import machinery by [@strawgate](https://github.com/strawgate) in [#3626](https://github.com/PrefectHQ/fastmcp/pull/3626)
- fix: recover StdioTransport after subprocess exits by [@strawgate](https://github.com/strawgate) in [#3630](https://github.com/PrefectHQ/fastmcp/pull/3630)
- fix(server): preserve mounted tool task metadata by [@pandego](https://github.com/pandego) in [#3632](https://github.com/PrefectHQ/fastmcp/pull/3632)
- fix: scope deprecation warning filter to FastMCPDeprecationWarning by [@jlowin](https://github.com/jlowin) in [#3649](https://github.com/PrefectHQ/fastmcp/pull/3649)
- fix: resolve CurrentFastMCP/ctx.fastmcp to child server in mounted background tasks by [@jlowin](https://github.com/jlowin) in [#3651](https://github.com/PrefectHQ/fastmcp/pull/3651)
- Fix blocking docs issues: chart imports, Select API, Rx consistency by [@jlowin](https://github.com/jlowin) in [#3652](https://github.com/PrefectHQ/fastmcp/pull/3652)
- Fix prompt caching round-trip on cache miss by [@strawgate](https://github.com/strawgate) in [#3666](https://github.com/PrefectHQ/fastmcp/pull/3666)
- fix: serialize object query params per OpenAPI style/explode rules by [@4444J99](https://github.com/4444J99) in [#3662](https://github.com/PrefectHQ/fastmcp/pull/3662)
- fix: HTTP request headers not accessible in background task workers by [@pandego](https://github.com/pandego) in [#3631](https://github.com/PrefectHQ/fastmcp/pull/3631)
- fix: restore HTTP headers in worker execution path for background tasks by [@jlowin](https://github.com/jlowin) in [#3681](https://github.com/PrefectHQ/fastmcp/pull/3681)
- fix: strip discriminator after dereferencing schemas by [@jlowin](https://github.com/jlowin) in [#3682](https://github.com/PrefectHQ/fastmcp/pull/3682)
- fix: remove stale ty:ignore directives for ty 0.0.26 by [@jlowin](https://github.com/jlowin) in [#3684](https://github.com/PrefectHQ/fastmcp/pull/3684)
- fix: dev apps log panel UX improvements by [@jlowin](https://github.com/jlowin) in [#3698](https://github.com/PrefectHQ/fastmcp/pull/3698)
- Add quiz example app, fix dev server empty string args by [@jlowin](https://github.com/jlowin) in [#3700](https://github.com/PrefectHQ/fastmcp/pull/3700)

### [​](#docs--7) Docs 📚

- Add early-development warning to Prefab docs by [@jlowin](https://github.com/jlowin) in [#3362](https://github.com/PrefectHQ/fastmcp/pull/3362)
- Add tag to docs by [@jlowin](https://github.com/jlowin) in [#3382](https://github.com/PrefectHQ/fastmcp/pull/3382)
- Add settings and environment variables reference by [@jlowin](https://github.com/jlowin) in [#3384](https://github.com/PrefectHQ/fastmcp/pull/3384)
- Add contributing guidelines and update issue/PR templates by [@jlowin](https://github.com/jlowin) in [#3485](https://github.com/PrefectHQ/fastmcp/pull/3485)
- [Documentation] Move stateless\_http transport kwarg to http\_app as FastMCP constructo… by [@mhallo](https://github.com/mhallo) in [#3510](https://github.com/PrefectHQ/fastmcp/pull/3510)
- Update security policy by [@jlowin](https://github.com/jlowin) in [#3521](https://github.com/PrefectHQ/fastmcp/pull/3521)
- Add release instructions to CLAUDE.md by [@jlowin](https://github.com/jlowin) in [#3583](https://github.com/PrefectHQ/fastmcp/pull/3583)
- fix(docs): correct misleading stateless\_http header by [@jlowin](https://github.com/jlowin) in [#3622](https://github.com/PrefectHQ/fastmcp/pull/3622)
- Add tag to deployment pages by [@jlowin](https://github.com/jlowin) in [#3624](https://github.com/PrefectHQ/fastmcp/pull/3624)
- Docs: generative UI page, fix imports, add PrefabAppConfig by [@jlowin](https://github.com/jlowin) in [#3650](https://github.com/PrefectHQ/fastmcp/pull/3650)
- docs: improve contributor guidelines for framework contributions by [@jlowin](https://github.com/jlowin) in [#3653](https://github.com/PrefectHQ/fastmcp/pull/3653)
- Add release notes for v3.1.0, v3.1.1, and v2.14.6 by [@jlowin](https://github.com/jlowin) in [#3659](https://github.com/PrefectHQ/fastmcp/pull/3659)
- Docs: showcase hero, narrative improvements, panel closed by default by [@jlowin](https://github.com/jlowin) in [#3657](https://github.com/PrefectHQ/fastmcp/pull/3657)
- Docs: add FileTreeStore sanitization warnings and update examples by [@strawgate](https://github.com/strawgate) in [#3661](https://github.com/PrefectHQ/fastmcp/pull/3661)
- Add prefab-ui version pinning warning to docs by [@jlowin](https://github.com/jlowin) in [#3688](https://github.com/PrefectHQ/fastmcp/pull/3688)
- Reorganize apps overview TOC by [@jlowin](https://github.com/jlowin) in [#3689](https://github.com/PrefectHQ/fastmcp/pull/3689)
- Fix docs gaps in app provider pages by [@jlowin](https://github.com/jlowin) in [#3690](https://github.com/PrefectHQ/fastmcp/pull/3690)
- Polish apps docs for 3.2 release by [@jlowin](https://github.com/jlowin) in [#3693](https://github.com/PrefectHQ/fastmcp/pull/3693)
- Add apps quickstart tutorial by [@jlowin](https://github.com/jlowin) in [#3695](https://github.com/PrefectHQ/fastmcp/pull/3695)
- Improve quickstart: pie chart, interactive row selection, screenshots by [@jlowin](https://github.com/jlowin) in [#3699](https://github.com/PrefectHQ/fastmcp/pull/3699)
- Add sales dashboard and live system monitor examples, bump prefab-ui to 0.17 by [@jlowin](https://github.com/jlowin) in [#3696](https://github.com/PrefectHQ/fastmcp/pull/3696)
- Add examples gallery page by [@jlowin](https://github.com/jlowin) in [#3705](https://github.com/PrefectHQ/fastmcp/pull/3705)
- docs: note that custom routes are unauthenticated by [@jlowin](https://github.com/jlowin) in [#3706](https://github.com/PrefectHQ/fastmcp/pull/3706)
- Remove hardcoded prefab-ui version from pinning warnings by [@jlowin](https://github.com/jlowin) in [#3708](https://github.com/PrefectHQ/fastmcp/pull/3708)

### [​](#examples-&-contrib--2) Examples & Contrib 💡

- Block recursive self-invocation in BulkToolCaller by [@jlowin](https://github.com/jlowin) in [#3433](https://github.com/PrefectHQ/fastmcp/pull/3433)

### [​](#dependencies--6) Dependencies 📦

- Bump authlib from 1.6.6 to 1.6.7 in /examples/testing\_demo in the uv group across 1 directory by [@dependabot](https://github.com/dependabot) in [#3390](https://github.com/PrefectHQ/fastmcp/pull/3390)
- Bump actions/create-github-app-token from 2 to 3 by [@dependabot](https://github.com/dependabot) in [#3511](https://github.com/PrefectHQ/fastmcp/pull/3511)
- chore(deps): bump pyasn1 from 0.6.2 to 0.6.3 in the uv group across 1 directory by [@dependabot](https://github.com/dependabot) in [#3538](https://github.com/PrefectHQ/fastmcp/pull/3538)
- chore(deps): bump j178/prek-action from 1 to 2 by [@dependabot](https://github.com/dependabot) in [#3578](https://github.com/PrefectHQ/fastmcp/pull/3578)
- chore(deps): bump requests from 2.32.5 to 2.33.0 in the uv group across 1 directory by [@dependabot](https://github.com/dependabot) in [#3638](https://github.com/PrefectHQ/fastmcp/pull/3638)
- chore(deps): bump cryptography from 46.0.5 to 46.0.6 in /examples/testing\_demo in the uv group across 1 directory by [@dependabot](https://github.com/dependabot) in [#3685](https://github.com/PrefectHQ/fastmcp/pull/3685)
- chore(deps): bump actions/setup-node from 4 to 6 by [@dependabot](https://github.com/dependabot) in [#3691](https://github.com/PrefectHQ/fastmcp/pull/3691)

## [​](#new-contributors-5) New Contributors

- @Sumanshu-Nankana made their first contribution in [#3380](https://github.com/PrefectHQ/fastmcp/pull/3380)
- @ericrobinson-indeed made their first contribution in [#3396](https://github.com/PrefectHQ/fastmcp/pull/3396)
- @voidborne-d made their first contribution in [#3465](https://github.com/PrefectHQ/fastmcp/pull/3465)
- @mtthidoteu made their first contribution in [#3473](https://github.com/PrefectHQ/fastmcp/pull/3473)
- @saschabuehrle made their first contribution in [#3456](https://github.com/PrefectHQ/fastmcp/pull/3456)
- @hkc5 made their first contribution in [#3468](https://github.com/PrefectHQ/fastmcp/pull/3468)
- @nightcityblade made their first contribution in [#3440](https://github.com/PrefectHQ/fastmcp/pull/3440)
- @mhallo made their first contribution in [#3510](https://github.com/PrefectHQ/fastmcp/pull/3510)
- @radoshi made their first contribution in [#3589](https://github.com/PrefectHQ/fastmcp/pull/3589)
- @shigechika made their first contribution in [#3603](https://github.com/PrefectHQ/fastmcp/pull/3603)
- @pandego made their first contribution in [#3632](https://github.com/PrefectHQ/fastmcp/pull/3632)
- @4444J99 made their first contribution in [#3662](https://github.com/PrefectHQ/fastmcp/pull/3662)
- @mostafa6765 made their first contribution in [#3677](https://github.com/PrefectHQ/fastmcp/pull/3677)

**Full Changelog**: [v3.1.0…v3.2.0](https://github.com/PrefectHQ/fastmcp/compare/v3.1.0...v3.2.0)

[​](#v3-1-1)

v3.1.1

2026-03-14

**[v3.1.1: ‘Tis But a Patch](https://github.com/PrefectHQ/fastmcp/releases/tag/v3.1.1)**Pins `pydantic-monty` below 0.0.8 to fix a breaking change in Monty that affects code mode. Monty 0.0.8 removed the `external_functions` constructor parameter, causing `MontySandboxProvider` to fail. This patch caps the version so existing installs work correctly.

### [​](#fixes--9) Fixes 🐞

- Pin pydantic-monty below 0.0.8 to fix code mode by [@jlowin](https://github.com/jlowin) in [#3497](https://github.com/PrefectHQ/fastmcp/pull/3497)

**Full Changelog**: [v3.1.0…v3.1.1](https://github.com/PrefectHQ/fastmcp/compare/v3.1.0...v3.1.1)

[​](#v3-1-0)

v3.1.0

2026-03-03

**[v3.1.0: Code to Joy](https://github.com/PrefectHQ/fastmcp/releases/tag/v3.1.0)**FastMCP 3.1 is the Code Mode release. The 3.0 architecture introduced providers and transforms as the extensibility layer — 3.1 puts that architecture to work, shipping the most requested capability since launch: servers that can find and execute code on behalf of agents, without requiring clients to know what tools exist.

### [​](#new-features--4) New Features 🎉

- feat: Search transforms for tool discovery by [@jlowin](https://github.com/jlowin) in [#3154](https://github.com/PrefectHQ/fastmcp/pull/3154)
- Add experimental CodeMode transform by [@aaazzam](https://github.com/aaazzam) in [#3297](https://github.com/PrefectHQ/fastmcp/pull/3297)
- Add Prefab Apps integration for MCP tool UIs by [@jlowin](https://github.com/jlowin) in [#3316](https://github.com/PrefectHQ/fastmcp/pull/3316)

### [​](#enhancements-) Enhancements 🔧

- Lazy-load heavy imports to reduce import time by [@jlowin](https://github.com/jlowin) in [#3295](https://github.com/PrefectHQ/fastmcp/pull/3295)
- Add http\_client parameter to all token verifiers for connection pooling by [@jlowin](https://github.com/jlowin) in [#3300](https://github.com/PrefectHQ/fastmcp/pull/3300)
- Add in-memory caching for token introspection results by [@jlowin](https://github.com/jlowin) in [#3298](https://github.com/PrefectHQ/fastmcp/pull/3298)
- Add SessionStart hook to install gh CLI in cloud sessions by [@jlowin](https://github.com/jlowin) in [#3308](https://github.com/PrefectHQ/fastmcp/pull/3308)
- Fix ty 0.0.19 type errors by [@jlowin](https://github.com/jlowin) in [#3310](https://github.com/PrefectHQ/fastmcp/pull/3310)
- Code Mode: Add resource limits to MontySandboxProvider by [@jlowin](https://github.com/jlowin) in [#3326](https://github.com/PrefectHQ/fastmcp/pull/3326)
- Accept transforms as FastMCP init kwarg by [@jlowin](https://github.com/jlowin) in [#3324](https://github.com/PrefectHQ/fastmcp/pull/3324)
- Split large test files to comply with loq line limit by [@jlowin](https://github.com/jlowin) in [#3328](https://github.com/PrefectHQ/fastmcp/pull/3328)
- Add -m/—module flag to `fastmcp run` and `dev inspector` by [@dgenio](https://github.com/dgenio) in [#3331](https://github.com/PrefectHQ/fastmcp/pull/3331)
- Add search\_result\_serializer hook and serialize\_tools\_for\_output\_markdown by [@MagnusS0](https://github.com/MagnusS0) in [#3337](https://github.com/PrefectHQ/fastmcp/pull/3337)
- Add MultiAuth for composing multiple token verification sources by [@jlowin](https://github.com/jlowin) in [#3335](https://github.com/PrefectHQ/fastmcp/pull/3335)
- Adds PropelAuth as an AuthProvider by [@andrew-propelauth](https://github.com/andrew-propelauth) in [#3358](https://github.com/PrefectHQ/fastmcp/pull/3358)
- Replace vendored DI with uncalled-for by [@chrisguidry](https://github.com/chrisguidry) in [#3301](https://github.com/PrefectHQ/fastmcp/pull/3301)
- Decompose CodeMode into composable discovery tools by [@jlowin](https://github.com/jlowin) in [#3354](https://github.com/PrefectHQ/fastmcp/pull/3354)
- feat(contrib): auto-sync MCPMixin decorators with from\_function signatures by [@AnkeshThakur](https://github.com/AnkeshThakur) in [#3323](https://github.com/PrefectHQ/fastmcp/pull/3323)
- Add Google GenAI Sampling Handler by [@strawgate](https://github.com/strawgate) in [#2977](https://github.com/PrefectHQ/fastmcp/pull/2977)
- Add ListTools, search limit, and catalog size annotation to CodeMode by [@jlowin](https://github.com/jlowin) in [#3359](https://github.com/PrefectHQ/fastmcp/pull/3359)
- Allow configuring FastMCP transport setting in the same way as other configuration by [@jvdmr](https://github.com/jvdmr) in [#1796](https://github.com/PrefectHQ/fastmcp/pull/1796)
- Add include\_unversioned option to VersionFilter by [@yangbaechu](https://github.com/yangbaechu) in [#3349](https://github.com/PrefectHQ/fastmcp/pull/3349)

### [​](#fixes--10) Fixes 🐞

- Fix docs banner pushing nav down by [@jlowin](https://github.com/jlowin) in [#3282](https://github.com/PrefectHQ/fastmcp/pull/3282)
- fix: Replace hardcoded TTL with DEFAULT\_TTL\_MS - issue #3279 by [@cedric57](https://github.com/cedric57) in [#3280](https://github.com/PrefectHQ/fastmcp/pull/3280)
- fix: stop suppressing server stderr in fastmcp call by [@jlowin](https://github.com/jlowin) in [#3283](https://github.com/PrefectHQ/fastmcp/pull/3283)
- fix: skip max\_completion\_tokens when maxTokens is None by [@eon01](https://github.com/eon01) in [#3284](https://github.com/PrefectHQ/fastmcp/pull/3284)
- OpenAPI: rewrite $ref under propertyNames and patternProperties in \_replace\_ref\_with\_defs; add regression test for dict[StrEnum, Model] by [@manojPal23234](https://github.com/manojPal23234) in [#3306](https://github.com/PrefectHQ/fastmcp/pull/3306)
- Remove stale add\_resource() key parameter from docs by [@jlowin](https://github.com/jlowin) in [#3309](https://github.com/PrefectHQ/fastmcp/pull/3309)
- Handle AuthorizationError as exclusion in AuthMiddleware list hooks by [@yangbaechu](https://github.com/yangbaechu) in [#3338](https://github.com/PrefectHQ/fastmcp/pull/3338)
- Fix flaky OpenAPI performance test threshold by [@jlowin](https://github.com/jlowin) in [#3355](https://github.com/PrefectHQ/fastmcp/pull/3355)
- Fix flaky SSE timeout test by [@jlowin](https://github.com/jlowin) in [#3343](https://github.com/PrefectHQ/fastmcp/pull/3343)
- Remove system role references from docs by [@jlowin](https://github.com/jlowin) in [#3356](https://github.com/PrefectHQ/fastmcp/pull/3356)
- Fix session persistence across tool calls in multi-server MCPConfigTransport by [@jer805](https://github.com/jer805) in [#3330](https://github.com/PrefectHQ/fastmcp/pull/3330)

### [​](#docs--8) Docs 📚

- Add v3.0.2 release notes by [@jlowin](https://github.com/jlowin) in [#3276](https://github.com/PrefectHQ/fastmcp/pull/3276)
- Fix “FastMCP Constructor Parameters” in documentation server.mdx (Remove old parameters & Add new parameter) by [@wangyy04](https://github.com/wangyy04) in [#3317](https://github.com/PrefectHQ/fastmcp/pull/3317)
- Fix stale docs: tag filtering API and missing output\_schema param by [@jlowin](https://github.com/jlowin) in [#3322](https://github.com/PrefectHQ/fastmcp/pull/3322)
- Narrate search example clients by [@jlowin](https://github.com/jlowin) in [#3321](https://github.com/PrefectHQ/fastmcp/pull/3321)
- Code Mode: Document resource limits and fix docs formatting by [@jlowin](https://github.com/jlowin) in [#3327](https://github.com/PrefectHQ/fastmcp/pull/3327)
- Add reverse proxy (nginx) section to HTTP deployment docs by [@dgenio](https://github.com/dgenio) in [#3344](https://github.com/PrefectHQ/fastmcp/pull/3344)
- Restructure docs navigation: CLI section, Composition, More by [@jlowin](https://github.com/jlowin) in [#3361](https://github.com/PrefectHQ/fastmcp/pull/3361)

### [​](#other-changes--3) Other Changes 🦾

- Don’t advertise sampling.tools capability by default by [@jlowin](https://github.com/jlowin) in [#3334](https://github.com/PrefectHQ/fastmcp/pull/3334)

## [​](#new-contributors-6) New Contributors

- @cedric57 made their first contribution in [#3280](https://github.com/PrefectHQ/fastmcp/pull/3280)
- @eon01 made their first contribution in [#3284](https://github.com/PrefectHQ/fastmcp/pull/3284)
- @manojPal23234 made their first contribution in [#3306](https://github.com/PrefectHQ/fastmcp/pull/3306)
- @wangyy04 made their first contribution in [#3317](https://github.com/PrefectHQ/fastmcp/pull/3317)
- @yangbaechu made their first contribution in [#3338](https://github.com/PrefectHQ/fastmcp/pull/3338)
- @andrew-propelauth made their first contribution in [#3358](https://github.com/PrefectHQ/fastmcp/pull/3358)
- @jer805 made their first contribution in [#3330](https://github.com/PrefectHQ/fastmcp/pull/3330)
- @jvdmr made their first contribution in [#1796](https://github.com/PrefectHQ/fastmcp/pull/1796)

**Full Changelog**: [v3.0.2…v3.1.0](https://github.com/PrefectHQ/fastmcp/compare/v3.0.2...v3.1.0)

[​](#v3-0-2)

v3.0.2

2026-02-22

**[v3.0.2: Threecovery Mode II](https://github.com/PrefectHQ/fastmcp/releases/tag/v3.0.2)**Two community-contributed fixes: auth headers from MCP transport no longer leak through to downstream OpenAPI APIs, and background task workers now correctly receive the originating request ID. Plus a new docs example for context-aware tool factories.

### [​](#fixes--11) Fixes 🐞

- fix: prevent MCP transport auth header from leaking to downstream OpenAPI APIs by [@stakeswky](https://github.com/stakeswky) in [#3262](https://github.com/PrefectHQ/fastmcp/pull/3262)
- fix: propagate origin\_request\_id to background task workers by [@gfortaine](https://github.com/gfortaine) in [#3175](https://github.com/PrefectHQ/fastmcp/pull/3175)

### [​](#docs--9) Docs 📚

- Add v3.0.1 release notes by [@jlowin](https://github.com/jlowin) in [#3259](https://github.com/PrefectHQ/fastmcp/pull/3259)
- docs: add context-aware tool factory example by [@machov](https://github.com/machov) in [#3264](https://github.com/PrefectHQ/fastmcp/pull/3264)

**Full Changelog**: [v3.0.1…v3.0.2](https://github.com/PrefectHQ/fastmcp/compare/v3.0.1...v3.0.2)

[​](#v3-0-1)

v3.0.1

2026-02-20

**[v3.0.1: Three-covery Mode](https://github.com/PrefectHQ/fastmcp/releases/tag/v3.0.1)**First patch after 3.0 — mostly smoothing out rough edges discovered in the wild. The big ones: middleware state that wasn’t surviving the trip to tool handlers now does, `Tool.from_tool()` accepts callables again, OpenAPI schemas with circular references no longer crash discovery, and decorator overloads now return the correct types in function mode. Also adds `verify_id_token` to OIDCProxy for providers (like some Azure AD configs) that issue opaque access tokens but standard JWT id\_tokens.

### [​](#enhancements--2) Enhancements 🔧

- Add verify\_id\_token option to OIDCProxy by [@jlowin](https://github.com/jlowin) in [#3248](https://github.com/PrefectHQ/fastmcp/pull/3248)

### [​](#fixes--12) Fixes 🐞

- Fix v3.0.0 changelog compare link by [@jlowin](https://github.com/jlowin) in [#3223](https://github.com/PrefectHQ/fastmcp/pull/3223)
- Fix MDX parse error in upgrade guide prompts by [@jlowin](https://github.com/jlowin) in [#3227](https://github.com/PrefectHQ/fastmcp/pull/3227)
- Fix non-serializable state lost between middleware and tools by [@jlowin](https://github.com/jlowin) in [#3234](https://github.com/PrefectHQ/fastmcp/pull/3234)
- Accept callables in Tool.from\_tool() by [@jlowin](https://github.com/jlowin) in [#3235](https://github.com/PrefectHQ/fastmcp/pull/3235)
- Preserve skill metadata through provider wrapping by [@jlowin](https://github.com/jlowin) in [#3237](https://github.com/PrefectHQ/fastmcp/pull/3237)
- Fix circular reference crash in OpenAPI schemas by [@jlowin](https://github.com/jlowin) in [#3245](https://github.com/PrefectHQ/fastmcp/pull/3245)
- Fix NameError with future annotations and Context/Depends parameters by [@jlowin](https://github.com/jlowin) in [#3243](https://github.com/PrefectHQ/fastmcp/pull/3243)
- Fix ty ignore syntax in OpenAPI provider by [@jlowin](https://github.com/jlowin) in [#3253](https://github.com/PrefectHQ/fastmcp/pull/3253)
- Use max\_completion\_tokens instead of deprecated max\_tokens in OpenAI handler by [@jlowin](https://github.com/jlowin) in [#3254](https://github.com/PrefectHQ/fastmcp/pull/3254)
- Fix ty compatibility with upgraded deps by [@jlowin](https://github.com/jlowin) in [#3257](https://github.com/PrefectHQ/fastmcp/pull/3257)
- Fix decorator overload return types for function mode by [@jlowin](https://github.com/jlowin) in [#3258](https://github.com/PrefectHQ/fastmcp/pull/3258)

### [​](#docs--10) Docs 📚

- Sync README with welcome.mdx, fix install count by [@jlowin](https://github.com/jlowin) in [#3224](https://github.com/PrefectHQ/fastmcp/pull/3224)
- Document dict-to-Message prompt migration in upgrade guides by [@jlowin](https://github.com/jlowin) in [#3225](https://github.com/PrefectHQ/fastmcp/pull/3225)
- Fix v2 upgrade guide: remove incorrect v1 import advice by [@jlowin](https://github.com/jlowin) in [#3226](https://github.com/PrefectHQ/fastmcp/pull/3226)
- Animated banner by [@jlowin](https://github.com/jlowin) in [#3231](https://github.com/PrefectHQ/fastmcp/pull/3231)
- Document mounted server state store isolation in upgrade guide by [@jlowin](https://github.com/jlowin) in [#3236](https://github.com/PrefectHQ/fastmcp/pull/3236)

**Full Changelog**: [v3.0.0…v3.0.1](https://github.com/PrefectHQ/fastmcp/compare/v3.0.0...v3.0.1)

[​](#v3-0-0)

v3.0.0

2026-02-18

**[v3.0.0: Three at Last](https://github.com/PrefectHQ/fastmcp/releases/tag/v3.0.0)**FastMCP 3.0 is stable. Two betas, two release candidates, 21 new contributors, and more than 100,000 pre-release installs later — the architecture held up, the upgrade path was smooth, and we’re shipping it.The surface API is largely unchanged — `@mcp.tool()` still works exactly as before. What changed is everything underneath: a provider/transform architecture that makes FastMCP extensible, observable, and composable in ways v2 couldn’t support. If we did our jobs right, you’ll barely notice the redesign. You’ll just notice that more is possible.This is also the release where FastMCP moves from [jlowin/fastmcp](https://github.com/jlowin/fastmcp) to [PrefectHQ/fastmcp](https://github.com/PrefectHQ/fastmcp). GitHub forwards all links, PyPI is the same, imports are the same. A major version felt like the right moment to make it official.

### [​](#build-servers-from-anything) Build servers from anything

🔌 Components no longer have to live in one file with one server. `FileSystemProvider` discovers tools from directories with hot-reload. `OpenAPIProvider` wraps REST APIs. `ProxyProvider` proxies remote MCP servers. `SkillsProvider` delivers agent skills as resources. Write your own provider for whatever source makes sense. Compose multiple providers into one server, share one across many, or chain them with **transforms** that rename, namespace, filter, version, and secure components as they flow to clients. `ResourcesAsTools` and `PromptsAsTools` expose non-tool components to tool-only clients.

### [​](#ship-to-production) Ship to production

🔐 Component versioning: serve `@tool(version="2.0")` alongside older versions from one codebase. Granular authorization on individual components with async auth checks, server-wide policies via `AuthMiddleware`, and scope-based access control. OAuth gets CIMD, Static Client Registration, Azure OBO via dependency injection, JWT audience validation, and confused-deputy protections. OpenTelemetry tracing with MCP semantic conventions. Response size limiting. Background tasks with distributed Redis notification and `ctx.elicit()` relay. Security fixes include dropping `diskcache` (CVE-2025-69872) and upgrading `python-multipart` and `protobuf` for additional CVEs.

### [​](#adapt-per-session) Adapt per session

💾 Session state persists across requests via `ctx.set_state()` / `ctx.get_state()`. `ctx.enable_components()` and `ctx.disable_components()` let servers adapt dynamically per client — show admin tools after authentication, progressively reveal capabilities, or scope access by role.

### [​](#develop-faster) Develop faster

⚡ `--reload` auto-restarts on file changes. Standalone decorators return the original function, so decorated tools stay callable in tests and non-MCP contexts. Sync functions auto-dispatch to a threadpool. Tool timeouts, MCP-compliant pagination, composable lifespans, `PingMiddleware` for keepalive, and concurrent tool execution when the LLM returns multiple calls in one response.

### [​](#use-fastmcp-as-a-cli) Use FastMCP as a CLI

🖥️ `fastmcp list` and `fastmcp call` query and invoke tools on any server from a terminal. `fastmcp discover` scans your editor configs (Claude Desktop, Cursor, Goose, Gemini CLI) and finds configured servers by name. `fastmcp generate-cli` writes a standalone typed CLI where every tool is a subcommand. `fastmcp install` registers your server with Claude Desktop, Cursor, or Goose in one command.

### [​](#build-apps-3-1-preview) Build apps (3.1 preview)

📱 Spec-level support for MCP Apps is in: `ui://` resource scheme, typed UI metadata via `AppConfig`, extension negotiation, and runtime detection. The full Apps experience lands in 3.1.

---

If you hit 3.0 because you didn’t pin your dependencies and something breaks — the [upgrade guides](gofastmcp__com__getting-started__upgrading__from-fastmcp-2.md) will get you sorted. We minimized breaking changes, but a major version is a major version.

pip install fastmcp -U

📖 [Documentation](gofastmcp__com.md)
🚀 [Upgrade from FastMCP v2](gofastmcp__com__getting-started__upgrading__from-fastmcp-2.md)
🔀 [Upgrade from MCP Python SDK](gofastmcp__com__getting-started__upgrading__from-mcp-sdk.md)

## [​](#what’s-changed) What’s Changed

### [​](#new-features--5) New Features 🎉

- Refactor resource behavior and add meta support by [@jlowin](https://github.com/jlowin) in [#2611](https://github.com/PrefectHQ/fastmcp/pull/2611)
- Refactor prompt behavior and add meta support by [@jlowin](https://github.com/jlowin) in [#2610](https://github.com/PrefectHQ/fastmcp/pull/2610)
- feat: Provider abstraction for dynamic MCP components by [@jlowin](https://github.com/jlowin) in [#2622](https://github.com/PrefectHQ/fastmcp/pull/2622)
- Unify component storage in LocalProvider by [@jlowin](https://github.com/jlowin) in [#2680](https://github.com/PrefectHQ/fastmcp/pull/2680)
- Introduce ResourceResult as canonical resource return type by [@jlowin](https://github.com/jlowin) in [#2734](https://github.com/PrefectHQ/fastmcp/pull/2734)
- Introduce Message and PromptResult as canonical prompt types by [@jlowin](https://github.com/jlowin) in [#2738](https://github.com/PrefectHQ/fastmcp/pull/2738)
- Add —reload flag for auto-restart on file changes by [@jlowin](https://github.com/jlowin) in [#2816](https://github.com/PrefectHQ/fastmcp/pull/2816)
- Add FileSystemProvider for filesystem-based component discovery by [@jlowin](https://github.com/jlowin) in [#2823](https://github.com/PrefectHQ/fastmcp/pull/2823)
- Add standalone decorators and eliminate fastmcp.fs module by [@jlowin](https://github.com/jlowin) in [#2832](https://github.com/PrefectHQ/fastmcp/pull/2832)
- Add authorization checks to components and servers by [@jlowin](https://github.com/jlowin) in [#2855](https://github.com/PrefectHQ/fastmcp/pull/2855)
- Decorators return functions instead of component objects by [@jlowin](https://github.com/jlowin) in [#2856](https://github.com/PrefectHQ/fastmcp/pull/2856)
- Add transform system for modifying components in provider chains by [@jlowin](https://github.com/jlowin) in [#2836](https://github.com/PrefectHQ/fastmcp/pull/2836)
- Add OpenTelemetry tracing support by [@chrisguidry](https://github.com/chrisguidry) in [#2869](https://github.com/PrefectHQ/fastmcp/pull/2869)
- Add component versioning and VersionFilter transform by [@jlowin](https://github.com/jlowin) in [#2894](https://github.com/PrefectHQ/fastmcp/pull/2894)
- Add version discovery and calling a certain version for components by [@jlowin](https://github.com/jlowin) in [#2897](https://github.com/PrefectHQ/fastmcp/pull/2897)
- Refactor visibility to mark-based enabled system by [@jlowin](https://github.com/jlowin) in [#2912](https://github.com/PrefectHQ/fastmcp/pull/2912)
- Add session-specific visibility control via Context by [@jlowin](https://github.com/jlowin) in [#2917](https://github.com/PrefectHQ/fastmcp/pull/2917)
- Add Skills Provider for exposing agent skills as MCP resources by [@jlowin](https://github.com/jlowin) in [#2944](https://github.com/PrefectHQ/fastmcp/pull/2944)
- Add MCP Apps Phase 1 — SDK compatibility (SEP-1865) by [@jlowin](https://github.com/jlowin) in [#3009](https://github.com/PrefectHQ/fastmcp/pull/3009)
- Add `fastmcp list` and `fastmcp call` CLI commands by [@jlowin](https://github.com/jlowin) in [#3054](https://github.com/PrefectHQ/fastmcp/pull/3054)
- Add `fastmcp generate-cli` command by [@jlowin](https://github.com/jlowin) in [#3065](https://github.com/PrefectHQ/fastmcp/pull/3065)
- Add CIMD (Client ID Metadata Document) support for OAuth by [@jlowin](https://github.com/jlowin) in [#2871](https://github.com/PrefectHQ/fastmcp/pull/2871)

### [​](#enhancements--3) Enhancements 🔧

- Convert mounted servers to MountedProvider by [@jlowin](https://github.com/jlowin) in [#2635](https://github.com/PrefectHQ/fastmcp/pull/2635)
- Simplify .key as computed property by [@jlowin](https://github.com/jlowin) in [#2648](https://github.com/PrefectHQ/fastmcp/pull/2648)
- Refactor MountedProvider into FastMCPProvider + TransformingProvider by [@jlowin](https://github.com/jlowin) in [#2653](https://github.com/PrefectHQ/fastmcp/pull/2653)
- Enable background task support for custom component subclasses by [@jlowin](https://github.com/jlowin) in [#2657](https://github.com/PrefectHQ/fastmcp/pull/2657)
- Use CreateTaskResult for background task creation by [@jlowin](https://github.com/jlowin) in [#2660](https://github.com/PrefectHQ/fastmcp/pull/2660)
- Refactor provider execution: components own their execution by [@jlowin](https://github.com/jlowin) in [#2663](https://github.com/PrefectHQ/fastmcp/pull/2663)
- Add supports\_tasks() method to replace string mode checks by [@jlowin](https://github.com/jlowin) in [#2664](https://github.com/PrefectHQ/fastmcp/pull/2664)
- Replace type: ignore[attr-defined] with isinstance assertions in tests by [@jlowin](https://github.com/jlowin) in [#2665](https://github.com/PrefectHQ/fastmcp/pull/2665)
- Add poll\_interval to TaskConfig by [@jlowin](https://github.com/jlowin) in [#2666](https://github.com/PrefectHQ/fastmcp/pull/2666)
- Refactor task module: rename protocol.py to requests.py and reduce redundancy by [@jlowin](https://github.com/jlowin) in [#2667](https://github.com/PrefectHQ/fastmcp/pull/2667)
- Refactor FastMCPProxy into ProxyProvider by [@jlowin](https://github.com/jlowin) in [#2669](https://github.com/PrefectHQ/fastmcp/pull/2669)
- Move OpenAPI to providers/openapi submodule by [@jlowin](https://github.com/jlowin) in [#2672](https://github.com/PrefectHQ/fastmcp/pull/2672)
- Use ergonomic provider initialization pattern by [@jlowin](https://github.com/jlowin) in [#2675](https://github.com/PrefectHQ/fastmcp/pull/2675)
- Fix ty 0.0.5 type errors by [@jlowin](https://github.com/jlowin) in [#2676](https://github.com/PrefectHQ/fastmcp/pull/2676)
- Remove execution methods from Provider base class by [@jlowin](https://github.com/jlowin) in [#2681](https://github.com/PrefectHQ/fastmcp/pull/2681)
- Add type-prefixed keys for globally unique component identification by [@jlowin](https://github.com/jlowin) in [#2704](https://github.com/PrefectHQ/fastmcp/pull/2704)
- Consolidate notification system with unified API by [@jlowin](https://github.com/jlowin) in [#2710](https://github.com/PrefectHQ/fastmcp/pull/2710)
- Parallelize provider operations by [@jlowin](https://github.com/jlowin) in [#2716](https://github.com/PrefectHQ/fastmcp/pull/2716)
- Consolidate get\_\* and *list*\* methods into single API by [@jlowin](https://github.com/jlowin) in [#2719](https://github.com/PrefectHQ/fastmcp/pull/2719)
- Consolidate execution method chains into single public API by [@jlowin](https://github.com/jlowin) in [#2728](https://github.com/PrefectHQ/fastmcp/pull/2728)
- Parallelize list\_\* calls in Provider.get\_tasks() by [@jlowin](https://github.com/jlowin) in [#2731](https://github.com/PrefectHQ/fastmcp/pull/2731)
- Consistent decorator-based MCP handler registration by [@jlowin](https://github.com/jlowin) in [#2732](https://github.com/PrefectHQ/fastmcp/pull/2732)
- Make ToolResult a BaseModel for serialization support by [@jlowin](https://github.com/jlowin) in [#2736](https://github.com/PrefectHQ/fastmcp/pull/2736)
- Align prompt handler with resource pattern by [@jlowin](https://github.com/jlowin) in [#2740](https://github.com/PrefectHQ/fastmcp/pull/2740)
- Update classes to inherit from FastMCPBaseModel instead of BaseModel by [@jlowin](https://github.com/jlowin) in [#2739](https://github.com/PrefectHQ/fastmcp/pull/2739)
- Add explicit task\_meta parameter to FastMCP.call\_tool() by [@jlowin](https://github.com/jlowin) in [#2749](https://github.com/PrefectHQ/fastmcp/pull/2749)
- Add task\_meta parameter to read\_resource() for explicit task control by [@jlowin](https://github.com/jlowin) in [#2750](https://github.com/PrefectHQ/fastmcp/pull/2750)
- Add task\_meta to prompts and centralize fn\_key enrichment by [@jlowin](https://github.com/jlowin) in [#2751](https://github.com/PrefectHQ/fastmcp/pull/2751)
- Remove unused include\_tags/exclude\_tags settings by [@jlowin](https://github.com/jlowin) in [#2756](https://github.com/PrefectHQ/fastmcp/pull/2756)
- Parallelize provider access when executing components by [@jlowin](https://github.com/jlowin) in [#2744](https://github.com/PrefectHQ/fastmcp/pull/2744)
- Deprecate tool\_serializer parameter by [@jlowin](https://github.com/jlowin) in [#2753](https://github.com/PrefectHQ/fastmcp/pull/2753)
- Feature/supabase custom auth route by [@EloiZalczer](https://github.com/EloiZalczer) in [#2632](https://github.com/PrefectHQ/fastmcp/pull/2632)
- Remove deprecated WSTransport by [@jlowin](https://github.com/jlowin) in [#2826](https://github.com/PrefectHQ/fastmcp/pull/2826)
- Add composable lifespans by [@jlowin](https://github.com/jlowin) in [#2828](https://github.com/PrefectHQ/fastmcp/pull/2828)
- Replace FastMCP.as\_proxy() with create\_proxy() function by [@jlowin](https://github.com/jlowin) in [#2829](https://github.com/PrefectHQ/fastmcp/pull/2829)
- Add PingMiddleware for keepalive connections by [@jlowin](https://github.com/jlowin) in [#2838](https://github.com/PrefectHQ/fastmcp/pull/2838)
- Run sync tools/resources/prompts in threadpool automatically by [@jlowin](https://github.com/jlowin) in [#2865](https://github.com/PrefectHQ/fastmcp/pull/2865)
- Add timeout parameter for tool foreground execution by [@jlowin](https://github.com/jlowin) in [#2872](https://github.com/PrefectHQ/fastmcp/pull/2872)
- Adopt OpenTelemetry MCP semantic conventions by [@chrisguidry](https://github.com/chrisguidry) in [#2886](https://github.com/PrefectHQ/fastmcp/pull/2886)
- Add client\_secret\_post authentication to IntrospectionTokenVerifier by [@shulkx](https://github.com/shulkx) in [#2884](https://github.com/PrefectHQ/fastmcp/pull/2884)
- Add enable\_rich\_logging setting to disable rich formatting by [@strawgate](https://github.com/strawgate) in [#2893](https://github.com/PrefectHQ/fastmcp/pull/2893)
- Rename \_fastmcp metadata namespace to fastmcp and make non-optional by [@jlowin](https://github.com/jlowin) in [#2895](https://github.com/PrefectHQ/fastmcp/pull/2895)
- Refactor FastMCP to inherit from Provider by [@jlowin](https://github.com/jlowin) in [#2901](https://github.com/PrefectHQ/fastmcp/pull/2901)
- Swap public/private method naming in Provider by [@jlowin](https://github.com/jlowin) in [#2902](https://github.com/PrefectHQ/fastmcp/pull/2902)
- Add MCP-compliant pagination support by [@jlowin](https://github.com/jlowin) in [#2903](https://github.com/PrefectHQ/fastmcp/pull/2903)
- Support VersionSpec in enable/disable for range-based filtering by [@jlowin](https://github.com/jlowin) in [#2914](https://github.com/PrefectHQ/fastmcp/pull/2914)
- Immutable transform wrapping for providers by [@jlowin](https://github.com/jlowin) in [#2913](https://github.com/PrefectHQ/fastmcp/pull/2913)
- Unify discovery API: deduplicate at protocol layer only by [@jlowin](https://github.com/jlowin) in [#2919](https://github.com/PrefectHQ/fastmcp/pull/2919)
- Add ResourcesAsTools transform by [@jlowin](https://github.com/jlowin) in [#2943](https://github.com/PrefectHQ/fastmcp/pull/2943)
- Add PromptsAsTools transform by [@jlowin](https://github.com/jlowin) in [#2946](https://github.com/PrefectHQ/fastmcp/pull/2946)
- Rename Enabled transform to Visibility by [@jlowin](https://github.com/jlowin) in [#2950](https://github.com/PrefectHQ/fastmcp/pull/2950)
- feat: option to add upstream claims to the FastMCP proxy JWT by [@JonasKs](https://github.com/JonasKs) in [#2997](https://github.com/PrefectHQ/fastmcp/pull/2997)
- fix: automatically include offline\_access as a scope in the Azure provider by [@JonasKs](https://github.com/JonasKs) in [#3001](https://github.com/PrefectHQ/fastmcp/pull/3001)
- feat: expand —reload to watch frontend file types by [@jlowin](https://github.com/jlowin) in [#3028](https://github.com/PrefectHQ/fastmcp/pull/3028)
- Add `fastmcp install stdio` command by [@jlowin](https://github.com/jlowin) in [#3032](https://github.com/PrefectHQ/fastmcp/pull/3032)
- feat: Goose integration + dedicated install command by [@jlowin](https://github.com/jlowin) in [#3040](https://github.com/PrefectHQ/fastmcp/pull/3040)
- Add `fastmcp discover` and name-based server resolution by [@jlowin](https://github.com/jlowin) in [#3055](https://github.com/PrefectHQ/fastmcp/pull/3055)
- feat(context): Add background task support for Context by [@gfortaine](https://github.com/gfortaine) in [#2905](https://github.com/PrefectHQ/fastmcp/pull/2905)
- Add server version to banner by [@richardkmichael](https://github.com/richardkmichael) in [#3076](https://github.com/PrefectHQ/fastmcp/pull/3076)
- Add @handle\_tool\_errors decorator for standardized error handling by [@dgenio](https://github.com/dgenio) in [#2885](https://github.com/PrefectHQ/fastmcp/pull/2885)
- Add ResponseLimitingMiddleware for tool response size control by [@dgenio](https://github.com/dgenio) in [#3072](https://github.com/PrefectHQ/fastmcp/pull/3072)
- Infer MIME types from OpenAPI response definitions by [@jlowin](https://github.com/jlowin) in [#3101](https://github.com/PrefectHQ/fastmcp/pull/3101)
- Remove require\_auth in favor of scope-based authorization by [@jlowin](https://github.com/jlowin) in [#3103](https://github.com/PrefectHQ/fastmcp/pull/3103)
- generate-cli: auto-generate SKILL.md agent skill by [@jlowin](https://github.com/jlowin) in [#3115](https://github.com/PrefectHQ/fastmcp/pull/3115)
- Add Azure OBO dependencies, auth token injection, and documentation by [@jlowin](https://github.com/jlowin) in [#2918](https://github.com/PrefectHQ/fastmcp/pull/2918)
- feat: add Static Client Registration by [@martimfasantos](https://github.com/martimfasantos) in [#3086](https://github.com/PrefectHQ/fastmcp/pull/3086)
- Add concurrent tool execution with sequential flag by [@strawgate](https://github.com/strawgate) in [#3022](https://github.com/PrefectHQ/fastmcp/pull/3022)
- Add validate\_output option for OpenAPI tools by [@jlowin](https://github.com/jlowin) in [#3134](https://github.com/PrefectHQ/fastmcp/pull/3134)
- Relay task elicitation through standard MCP protocol by [@chrisguidry](https://github.com/chrisguidry) in [#3136](https://github.com/PrefectHQ/fastmcp/pull/3136)
- Support async auth checks by [@jlowin](https://github.com/jlowin) in [#3152](https://github.com/PrefectHQ/fastmcp/pull/3152)
- Make $ref dereferencing optional via FastMCP(dereference\_refs=…) by [@jlowin](https://github.com/jlowin) in [#3151](https://github.com/PrefectHQ/fastmcp/pull/3151)
- Expose local\_provider property, deprecate FastMCP.remove\_tool() by [@jlowin](https://github.com/jlowin) in [#3155](https://github.com/PrefectHQ/fastmcp/pull/3155)
- Add helpers for converting FunctionTool and TransformedTool to SamplingTool by [@strawgate](https://github.com/strawgate) in [#3062](https://github.com/PrefectHQ/fastmcp/pull/3062)

### [​](#fixes--13) Fixes 🐞

- Let FastMCPError propagate from dependencies by [@chrisguidry](https://github.com/chrisguidry) in [#2646](https://github.com/PrefectHQ/fastmcp/pull/2646)
- Fix task execution for tools with custom names by [@chrisguidry](https://github.com/chrisguidry) in [#2645](https://github.com/PrefectHQ/fastmcp/pull/2645)
- fix: check the cause of the tool error by [@rjolaverria](https://github.com/rjolaverria) in [#2674](https://github.com/PrefectHQ/fastmcp/pull/2674)
- Fix uvicorn 0.39+ test timeouts and FastMCPError propagation by [@jlowin](https://github.com/jlowin) in [#2699](https://github.com/PrefectHQ/fastmcp/pull/2699)
- Fix: resolve root-level $ref in outputSchema for MCP spec compliance by [@majiayu000](https://github.com/majiayu000) in [#2720](https://github.com/PrefectHQ/fastmcp/pull/2720)
- Fix Proxy provider to return all resource contents by [@jlowin](https://github.com/jlowin) in [#2742](https://github.com/PrefectHQ/fastmcp/pull/2742)
- fix: Client OAuth async\_auth\_flow() method causing MCP-SDK lock error by [@lgndluke](https://github.com/lgndluke) in [#2644](https://github.com/PrefectHQ/fastmcp/pull/2644)
- Fix rate limit detection during teardown phase by [@jlowin](https://github.com/jlowin) in [#2757](https://github.com/PrefectHQ/fastmcp/pull/2757)
- Fix OAuth Proxy resource parameter validation by [@jlowin](https://github.com/jlowin) in [#2764](https://github.com/PrefectHQ/fastmcp/pull/2764)
- Fix `openapi_version` check so 3.1 is included by [@deeleeramone](https://github.com/deeleeramone) in [#2768](https://github.com/PrefectHQ/fastmcp/pull/2768)
- Fix base\_url fallback when url is not set by [@bhbs](https://github.com/bhbs) in [#2776](https://github.com/PrefectHQ/fastmcp/pull/2776)
- Lazy import DiskStore to avoid sqlite3 dependency on import by [@jlowin](https://github.com/jlowin) in [#2784](https://github.com/PrefectHQ/fastmcp/pull/2784)
- Fix OAuth token storage TTL calculation by [@jlowin](https://github.com/jlowin) in [#2796](https://github.com/PrefectHQ/fastmcp/pull/2796)
- Fix client hanging on HTTP 4xx/5xx errors by [@jlowin](https://github.com/jlowin) in [#2803](https://github.com/PrefectHQ/fastmcp/pull/2803)
- Fix keep\_alive passthrough in StdioMCPServer.to\_transport() by [@jlowin](https://github.com/jlowin) in [#2791](https://github.com/PrefectHQ/fastmcp/pull/2791)
- Dereference $ref in tool schemas for MCP client compatibility by [@jlowin](https://github.com/jlowin) in [#2808](https://github.com/PrefectHQ/fastmcp/pull/2808)
- Fix timeout not propagating to proxy clients in multi-server MCPConfig by [@jlowin](https://github.com/jlowin) in [#2809](https://github.com/PrefectHQ/fastmcp/pull/2809)
- Fix ContextVar propagation for ASGI-mounted servers with tasks by [@chrisguidry](https://github.com/chrisguidry) in [#2844](https://github.com/PrefectHQ/fastmcp/pull/2844)
- Fix HTTP transport timeout defaulting to 5 seconds by [@jlowin](https://github.com/jlowin) in [#2849](https://github.com/PrefectHQ/fastmcp/pull/2849)
- Fix task capabilities location (issue #2870) by [@jlowin](https://github.com/jlowin) in [#2875](https://github.com/PrefectHQ/fastmcp/pull/2875)
- fix: broaden combine\_lifespans type to accept Mapping return types by [@aminsamir45](https://github.com/aminsamir45) in [#3005](https://github.com/PrefectHQ/fastmcp/pull/3005)
- fix: correctly send resource when exchanging code for upstream by [@JonasKs](https://github.com/JonasKs) in [#3013](https://github.com/PrefectHQ/fastmcp/pull/3013)
- chore: upgrade python-multipart to 0.0.22 (CVE-2026-24486) by [@jlowin](https://github.com/jlowin) in [#3042](https://github.com/PrefectHQ/fastmcp/pull/3042)
- chore: upgrade protobuf to 6.33.5 (CVE-2026-0994) by [@jlowin](https://github.com/jlowin) in [#3043](https://github.com/PrefectHQ/fastmcp/pull/3043)
- fix: use MCP spec error code -32002 for resource not found by [@jlowin](https://github.com/jlowin) in [#3041](https://github.com/PrefectHQ/fastmcp/pull/3041)
- Fix tool\_choice reset for structured output sampling by [@strawgate](https://github.com/strawgate) in [#3014](https://github.com/PrefectHQ/fastmcp/pull/3014)
- fix: Preserve metadata in FastMCPProvider component wrappers by [@NeelayS](https://github.com/NeelayS) in [#3057](https://github.com/PrefectHQ/fastmcp/pull/3057)
- fix: enforce redirect URI validation when allowed\_client\_redirect\_uris is supplied by [@nathanwelsh8](https://github.com/nathanwelsh8) in [#3066](https://github.com/PrefectHQ/fastmcp/pull/3066)
- Fix —reload port conflict when using explicit port by [@jlowin](https://github.com/jlowin) in [#3070](https://github.com/PrefectHQ/fastmcp/pull/3070)
- Fix compress\_schema to preserve additionalProperties: false by [@jlowin](https://github.com/jlowin) in [#3102](https://github.com/PrefectHQ/fastmcp/pull/3102)
- Fix CIMD redirect allowlist bypass and cache revalidation by [@jlowin](https://github.com/jlowin) in [#3098](https://github.com/PrefectHQ/fastmcp/pull/3098)
- Fix session visibility marks leaking across sessions by [@jlowin](https://github.com/jlowin) in [#3132](https://github.com/PrefectHQ/fastmcp/pull/3132)
- Fix unhandled exceptions in OpenAPI POST tool calls by [@jlowin](https://github.com/jlowin) in [#3133](https://github.com/PrefectHQ/fastmcp/pull/3133)
- feat: distributed notification queue + BLPOP elicitation for background tasks by [@gfortaine](https://github.com/gfortaine) in [#2906](https://github.com/PrefectHQ/fastmcp/pull/2906)
- fix: snapshot access token for background tasks by [@gfortaine](https://github.com/gfortaine) in [#3138](https://github.com/PrefectHQ/fastmcp/pull/3138)
- fix: guard client pagination loops against misbehaving servers by [@jlowin](https://github.com/jlowin) in [#3167](https://github.com/PrefectHQ/fastmcp/pull/3167)
- Support non-serializable values in Context.set\_state by [@jlowin](https://github.com/jlowin) in [#3171](https://github.com/PrefectHQ/fastmcp/pull/3171)
- Fix stale request context in StatefulProxyClient handlers by [@jlowin](https://github.com/jlowin) in [#3172](https://github.com/PrefectHQ/fastmcp/pull/3172)
- Drop diskcache dependency (CVE-2025-69872) by [@jlowin](https://github.com/jlowin) in [#3185](https://github.com/PrefectHQ/fastmcp/pull/3185)
- Fix confused deputy attack via consent binding cookie by [@jlowin](https://github.com/jlowin) in [#3201](https://github.com/PrefectHQ/fastmcp/pull/3201)
- Add JWT audience validation and RFC 8707 warnings to auth providers by [@jlowin](https://github.com/jlowin) in [#3204](https://github.com/PrefectHQ/fastmcp/pull/3204)
- Cache OBO credentials on AzureProvider for token reuse by [@jlowin](https://github.com/jlowin) in [#3212](https://github.com/PrefectHQ/fastmcp/pull/3212)
- Fix invalid uv add command in upgrade guide by [@jlowin](https://github.com/jlowin) in [#3217](https://github.com/PrefectHQ/fastmcp/pull/3217)
- Use standard traceparent/tracestate keys per OTel MCP semconv by [@chrisguidry](https://github.com/chrisguidry) in [#3221](https://github.com/PrefectHQ/fastmcp/pull/3221)

### [​](#breaking-changes-) Breaking Changes 🛫

- Add VisibilityFilter for hierarchical enable/disable by [@jlowin](https://github.com/jlowin) in [#2708](https://github.com/PrefectHQ/fastmcp/pull/2708)
- Remove automatic environment variable loading from auth providers by [@jlowin](https://github.com/jlowin) in [#2752](https://github.com/PrefectHQ/fastmcp/pull/2752)
- Make pydocket optional and unify DI systems by [@jlowin](https://github.com/jlowin) in [#2835](https://github.com/PrefectHQ/fastmcp/pull/2835)
- Add session-scoped state persistence by [@jlowin](https://github.com/jlowin) in [#2873](https://github.com/PrefectHQ/fastmcp/pull/2873)
- Rename ui= to app= and consolidate ToolUI/ResourceUI into AppConfig by [@jlowin](https://github.com/jlowin) in [#3117](https://github.com/PrefectHQ/fastmcp/pull/3117)
- Remove deprecated FastMCP() constructor kwargs by [@jlowin](https://github.com/jlowin) in [#3148](https://github.com/PrefectHQ/fastmcp/pull/3148)
- Move `fastmcp dev` to `fastmcp dev inspector` by [@jlowin](https://github.com/jlowin) in [#3188](https://github.com/PrefectHQ/fastmcp/pull/3188)

## [​](#new-contributors-7) New Contributors

- [@ivanbelenky](https://github.com/ivanbelenky) made their first contribution in [#2656](https://github.com/PrefectHQ/fastmcp/pull/2656)
- [@rjolaverria](https://github.com/rjolaverria) made their first contribution in [#2674](https://github.com/PrefectHQ/fastmcp/pull/2674)
- [@mgoldsborough](https://github.com/mgoldsborough) made their first contribution in [#2701](https://github.com/PrefectHQ/fastmcp/pull/2701)
- [@Ashif4354](https://github.com/Ashif4354) made their first contribution in [#2707](https://github.com/PrefectHQ/fastmcp/pull/2707)
- [@majiayu000](https://github.com/majiayu000) made their first contribution in [#2720](https://github.com/PrefectHQ/fastmcp/pull/2720)
- [@lgndluke](https://github.com/lgndluke) made their first contribution in [#2644](https://github.com/PrefectHQ/fastmcp/pull/2644)
- [@EloiZalczer](https://github.com/EloiZalczer) made their first contribution in [#2632](https://github.com/PrefectHQ/fastmcp/pull/2632)
- [@deeleeramone](https://github.com/deeleeramone) made their first contribution in [#2768](https://github.com/PrefectHQ/fastmcp/pull/2768)
- [@shea-parkes](https://github.com/shea-parkes) made their first contribution in [#2781](https://github.com/PrefectHQ/fastmcp/pull/2781)
- [@bryankthompson](https://github.com/bryankthompson) made their first contribution in [#2777](https://github.com/PrefectHQ/fastmcp/pull/2777)
- [@bhbs](https://github.com/bhbs) made their first contribution in [#2776](https://github.com/PrefectHQ/fastmcp/pull/2776)
- [@shulkx](https://github.com/shulkx) made their first contribution in [#2884](https://github.com/PrefectHQ/fastmcp/pull/2884)
- [@abhijeethp](https://github.com/abhijeethp) made their first contribution in [#2967](https://github.com/PrefectHQ/fastmcp/pull/2967)
- [@aminsamir45](https://github.com/aminsamir45) made their first contribution in [#3005](https://github.com/PrefectHQ/fastmcp/pull/3005)
- [@JonasKs](https://github.com/JonasKs) made their first contribution in [#2997](https://github.com/PrefectHQ/fastmcp/pull/2997)
- [@NeelayS](https://github.com/NeelayS) made their first contribution in [#3057](https://github.com/PrefectHQ/fastmcp/pull/3057)
- [@gfortaine](https://github.com/gfortaine) made their first contribution in [#2905](https://github.com/PrefectHQ/fastmcp/pull/2905)
- [@nathanwelsh8](https://github.com/nathanwelsh8) made their first contribution in [#3066](https://github.com/PrefectHQ/fastmcp/pull/3066)
- [@dgenio](https://github.com/dgenio) made their first contribution in [#2885](https://github.com/PrefectHQ/fastmcp/pull/2885)
- [@martimfasantos](https://github.com/martimfasantos) made their first contribution in [#3086](https://github.com/PrefectHQ/fastmcp/pull/3086)
- [@jfBiswajit](https://github.com/jfBiswajit) made their first contribution in [#3193](https://github.com/PrefectHQ/fastmcp/pull/3193)

**Full Changelog**: [https://github.com/PrefectHQ/fastmcp/compare/v2.14.5…v3.0.0](https://github.com/PrefectHQ/fastmcp/compare/v2.14.5...v3.0.0)

[​](#v3-0-0rc1)

v3.0.0rc1

2026-02-12

**[v3.0.0rc1: RC-ing is Believing](https://github.com/PrefectHQ/fastmcp/releases/tag/v3.0.0rc1)**FastMCP 3 RC1 means we believe the API is stable. Beta 2 drew a wave of real-world adoption — production deployments, migration reports, integration testing — and the feedback overwhelmingly confirmed that the architecture works. This release closes gaps that surfaced under load: auth flows that needed to be async, background tasks that needed reliable notification delivery, and APIs still carrying beta-era naming. If nothing unexpected surfaces, this is what 3.0.0 looks like.🚨 **Breaking Changes** — The `ui=` parameter is now `app=` with a unified `AppConfig` class (matching the feature’s actual name), and 16 `FastMCP()` constructor kwargs have finally been removed. If you’ve been ignoring months of deprecation warnings, you’ll get a `TypeError` with specific migration instructions.🔐 **Auth Improvements** — Three changes that together round out FastMCP’s auth story for production. `auth=` checks can now be `async`, so you can hit databases or external services during authorization — previously, passing an async function silently passed because the unawaited coroutine was truthy. Static Client Registration lets clients provide a pre-registered `client_id`/`client_secret` directly, bypassing DCR for servers that don’t support it. And Azure OBO flows are now declarative via dependency injection:

from fastmcp.server.auth.providers.azure import EntraOBOToken

@mcp.tool()
async def get_emails(
    graph_token: str = EntraOBOToken(["https://graph.microsoft.com/Mail.Read"]),
):
    # OBO exchange already happened — just use the token
    ...

⚡ **Concurrent Sampling** — When an LLM returns multiple tool calls in a single response, `context.sample()` can now execute them in parallel. Opt in with `tool_concurrency=0` for unlimited parallelism, or set a bound. Tools that aren’t safe to parallelize can declare `sequential=True`.📡 **Background Task Notifications** — Background tasks now reliably push progress updates and elicit user input through the standard MCP protocol. A distributed Redis queue replaces polling (7,200 round-trips/hour → one blocking call), and `ctx.elicit()` in background tasks automatically relays through the client’s standard `elicitation_handler`.✅ **OpenAPI Output Validation** — When backends don’t conform to their own OpenAPI schemas, the MCP SDK rejects the response and the tool fails. `validate_output=False` disables strict schema checking while still passing structured JSON to clients — a necessary escape hatch for imperfect APIs.

## [​](#what’s-changed-2) What’s Changed

### [​](#enhancements--4) Enhancements 🔧

- generate-cli: auto-generate SKILL.md agent skill by [@jlowin](https://github.com/jlowin) in [#3115](https://github.com/PrefectHQ/fastmcp/pull/3115)
- Scope Martian triage to bug-labeled issues for jlowin by [@jlowin](https://github.com/jlowin) in [#3124](https://github.com/PrefectHQ/fastmcp/pull/3124)
- Add Azure OBO dependencies, auth token injection, and documentation by [@jlowin](https://github.com/jlowin) in [#2918](https://github.com/PrefectHQ/fastmcp/pull/2918)
- feat: add Static Client Registration (#3085) by [@martimfasantos](https://github.com/martimfasantos) in [#3086](https://github.com/PrefectHQ/fastmcp/pull/3086)
- Add concurrent tool execution with sequential flag by [@strawgate](https://github.com/strawgate) in [#3022](https://github.com/PrefectHQ/fastmcp/pull/3022)
- Add validate\_output option for OpenAPI tools by [@jlowin](https://github.com/jlowin) in [#3134](https://github.com/PrefectHQ/fastmcp/pull/3134)
- Relay task elicitation through standard MCP protocol by [@chrisguidry](https://github.com/chrisguidry) in [#3136](https://github.com/PrefectHQ/fastmcp/pull/3136)
- Bump py-key-value-aio to `>=0.4.0,<0.5.0` by [@strawgate](https://github.com/strawgate) in [#3143](https://github.com/PrefectHQ/fastmcp/pull/3143)
- Support async auth checks by [@jlowin](https://github.com/jlowin) in [#3152](https://github.com/PrefectHQ/fastmcp/pull/3152)
- Make $ref dereferencing optional via FastMCP(dereference\_refs=…) by [@jlowin](https://github.com/jlowin) in [#3151](https://github.com/PrefectHQ/fastmcp/pull/3151)
- Expose local\_provider property, deprecate FastMCP.remove\_tool() by [@jlowin](https://github.com/jlowin) in [#3155](https://github.com/PrefectHQ/fastmcp/pull/3155)
- Add helpers for converting FunctionTool and TransformedTool to SamplingTool by [@strawgate](https://github.com/strawgate) in [#3062](https://github.com/PrefectHQ/fastmcp/pull/3062)
- Updates to github actions / workflows for claude by [@strawgate](https://github.com/strawgate) in [#3157](https://github.com/PrefectHQ/fastmcp/pull/3157)

### [​](#fixes--14) Fixes 🐞

- Updated deprecation URL for V3 by [@SrzStephen](https://github.com/SrzStephen) in [#3108](https://github.com/PrefectHQ/fastmcp/pull/3108)
- Fix Windows test timeouts in OAuth proxy provider tests by [@strawgate](https://github.com/strawgate) in [#3123](https://github.com/PrefectHQ/fastmcp/pull/3123)
- Fix session visibility marks leaking across sessions by [@jlowin](https://github.com/jlowin) in [#3132](https://github.com/PrefectHQ/fastmcp/pull/3132)
- Fix unhandled exceptions in OpenAPI POST tool calls by [@jlowin](https://github.com/jlowin) in [#3133](https://github.com/PrefectHQ/fastmcp/pull/3133)
- feat: distributed notification queue + BLPOP elicitation for background tasks by [@gfortaine](https://github.com/gfortaine) in [#2906](https://github.com/PrefectHQ/fastmcp/pull/2906)
- fix: snapshot access token for background tasks (#3095) by [@gfortaine](https://github.com/gfortaine) in [#3138](https://github.com/PrefectHQ/fastmcp/pull/3138)
- Stop duplicating path parameter descriptions into tool prose by [@jlowin](https://github.com/jlowin) in [#3149](https://github.com/PrefectHQ/fastmcp/pull/3149)
- fix: guard client pagination loops against misbehaving servers by [@jlowin](https://github.com/jlowin) in [#3167](https://github.com/PrefectHQ/fastmcp/pull/3167)
- Fix stale get\_\* references in docs and examples by [@jlowin](https://github.com/jlowin) in [#3168](https://github.com/PrefectHQ/fastmcp/pull/3168)
- Support non-serializable values in Context.set\_state by [@jlowin](https://github.com/jlowin) in [#3171](https://github.com/PrefectHQ/fastmcp/pull/3171)
- Fix stale request context in StatefulProxyClient handlers by [@jlowin](https://github.com/jlowin) in [#3172](https://github.com/PrefectHQ/fastmcp/pull/3172)

### [​](#breaking-changes--2) Breaking Changes 🛫

- Rename ui= to app= and consolidate ToolUI/ResourceUI into AppConfig by [@jlowin](https://github.com/jlowin) in [#3117](https://github.com/PrefectHQ/fastmcp/pull/3117)
- Remove deprecated FastMCP() constructor kwargs by [@jlowin](https://github.com/jlowin) in [#3148](https://github.com/PrefectHQ/fastmcp/pull/3148)

### [​](#docs--11) Docs 📚

- Update docs to reference beta 2 by [@jlowin](https://github.com/jlowin) in [#3112](https://github.com/PrefectHQ/fastmcp/pull/3112)
- docs: add pre-registered OAuth clients to v3-features by [@jlowin](https://github.com/jlowin) in [#3129](https://github.com/PrefectHQ/fastmcp/pull/3129)

### [​](#dependencies--7) Dependencies 📦

- chore(deps): bump cryptography from 46.0.3 to 46.0.5 in /examples/testing\_demo in the uv group across 1 directory by @dependabot in [#3140](https://github.com/PrefectHQ/fastmcp/pull/3140)

### [​](#other-changes--4) Other Changes 🦾

- docs: add v3.0.0rc1 features to v3-features tracking by [@jlowin](https://github.com/jlowin) in [#3145](https://github.com/PrefectHQ/fastmcp/pull/3145)
- docs: remove nonexistent MSALApp from rc1 notes by [@jlowin](https://github.com/jlowin) in [#3146](https://github.com/PrefectHQ/fastmcp/pull/3146)

## [​](#new-contributors-8) New Contributors

- [@martimfasantos](https://github.com/martimfasantos) made their first contribution in [#3086](https://github.com/PrefectHQ/fastmcp/pull/3086)

**Full Changelog**: [https://github.com/PrefectHQ/fastmcp/compare/v3.0.0b2…v3.0.0rc1](https://github.com/PrefectHQ/fastmcp/compare/v3.0.0b2...v3.0.0rc1)

[​](#v3-0-0b2)

v3.0.0b2

2026-02-07

**[v3.0.0b2: 2 Fast 2 Beta](https://github.com/PrefectHQ/fastmcp/releases/tag/v3.0.0b2)**FastMCP 3 Beta 2 reflects the huge number of people that kicked the tires on Beta 1. Seven new contributors landed changes in this release, and early migration reports went smoother than expected, including teams on Prefect Horizon upgrading from v2. Most of Beta 2 is refinement: fixing what people found, filling gaps from real usage, hardening edges. But a few new features did land along the way.🖥️ **Client CLI** — `fastmcp list`, `fastmcp call`, `fastmcp discover`, and `fastmcp generate-cli` turn any MCP server into something you can poke at from a terminal. Discover servers configured in Claude Desktop, Cursor, Goose, or project-level `mcp.json` files and reference them by name. `generate-cli` reads a server’s schemas and writes a standalone typed CLI script where every tool is a proper subcommand with flags and help text.🔐 **CIMD** (Client ID Metadata Documents) adds an alternative to Dynamic Client Registration for OAuth. Clients host a static JSON document at an HTTPS URL; that URL becomes the `client_id`. Server-side support includes SSRF-hardened fetching, cache-aware revalidation, and `private_key_jwt` validation. Enabled by default on `OAuthProxy`.📱 **MCP Apps** — Spec-level compliance for the MCP Apps extension: `ui://` resource scheme, typed UI metadata on tools and resources, extension negotiation, and `ctx.client_supports_extension()` for runtime detection.⏳ **Background Task Context** — `Context` now works transparently in Docket workers. `ctx.elicit()` routes through Redis-based coordination so background tasks can pause for user input without any code changes.🛡️ **ResponseLimitingMiddleware** caps tool response sizes with UTF-8-safe truncation for text and schema-aware error handling for structured outputs.🪿 **Goose Integration** — `fastmcp install goose` generates deeplink URLs for one-command server installation into Goose.

## [​](#what’s-changed-3) What’s Changed

### [​](#new-features--6) New Features 🎉

- Add MCP Apps Phase 1 — SDK compatibility (SEP-1865) by [@jlowin](https://github.com/jlowin) in [#3009](https://github.com/PrefectHQ/fastmcp/pull/3009)
- Add `fastmcp list` and `fastmcp call` CLI commands by [@jlowin](https://github.com/jlowin) in [#3054](https://github.com/PrefectHQ/fastmcp/pull/3054)
- Add `fastmcp generate-cli` command by [@jlowin](https://github.com/jlowin) in [#3065](https://github.com/PrefectHQ/fastmcp/pull/3065)
- Add CIMD (Client ID Metadata Document) support for OAuth by [@jlowin](https://github.com/jlowin) in [#2871](https://github.com/PrefectHQ/fastmcp/pull/2871)

### [​](#enhancements--5) Enhancements 🔧

- Make duplicate bot less aggressive by [@jlowin](https://github.com/jlowin) in [#2981](https://github.com/PrefectHQ/fastmcp/pull/2981)
- Remove uv lockfile monitoring from Dependabot by [@jlowin](https://github.com/jlowin) in [#2986](https://github.com/PrefectHQ/fastmcp/pull/2986)
- Run static checks with —upgrade, remove lockfile check by [@jlowin](https://github.com/jlowin) in [#2988](https://github.com/PrefectHQ/fastmcp/pull/2988)
- Adjust workflow triggers for Marvin by [@strawgate](https://github.com/strawgate) in [#3010](https://github.com/PrefectHQ/fastmcp/pull/3010)
- Move tests to a reusable action and enable nightly checks by [@strawgate](https://github.com/strawgate) in [#3017](https://github.com/PrefectHQ/fastmcp/pull/3017)
- feat: option to add upstream claims to the FastMCP proxy JWT by [@JonasKs](https://github.com/JonasKs) in [#2997](https://github.com/PrefectHQ/fastmcp/pull/2997)
- Fix ty 0.0.14 compatibility and upgrade dependencies by [@jlowin](https://github.com/jlowin) in [#3027](https://github.com/PrefectHQ/fastmcp/pull/3027)
- fix: automatically include offline\_access as a scope in the Azure provider to enable automatic token refreshing by [@JonasKs](https://github.com/JonasKs) in [#3001](https://github.com/PrefectHQ/fastmcp/pull/3001)
- feat: expand —reload to watch frontend file types by [@jlowin](https://github.com/jlowin) in [#3028](https://github.com/PrefectHQ/fastmcp/pull/3028)
- Add `fastmcp install stdio` command by [@jlowin](https://github.com/jlowin) in [#3032](https://github.com/PrefectHQ/fastmcp/pull/3032)
- Update martian-issue-triage.yml for Workflow editing guidance by [@strawgate](https://github.com/strawgate) in [#3033](https://github.com/PrefectHQ/fastmcp/pull/3033)
- feat: Goose integration + dedicated install command by [@jlowin](https://github.com/jlowin) in [#3040](https://github.com/PrefectHQ/fastmcp/pull/3040)
- Fixing spelling issues in multiple files by [@didier-durand](https://github.com/didier-durand) in [#2996](https://github.com/PrefectHQ/fastmcp/pull/2996)
- Add `fastmcp discover` and name-based server resolution by [@jlowin](https://github.com/jlowin) in [#3055](https://github.com/PrefectHQ/fastmcp/pull/3055)
- feat(context): Add background task support for Context (SEP-1686) by [@gfortaine](https://github.com/gfortaine) in [#2905](https://github.com/PrefectHQ/fastmcp/pull/2905)
- Add server version to banner by [@richardkmichael](https://github.com/richardkmichael) in [#3076](https://github.com/PrefectHQ/fastmcp/pull/3076)
- Add @handle\_tool\_errors decorator for standardized error handling by [@dgenio](https://github.com/dgenio) in [#2885](https://github.com/PrefectHQ/fastmcp/pull/2885)
- Update Anthropic and OpenAI clients to use Omit instead of NotGiven by [@jlowin](https://github.com/jlowin) in [#3088](https://github.com/PrefectHQ/fastmcp/pull/3088)
- Add ResponseLimitingMiddleware for tool response size control by [@dgenio](https://github.com/dgenio) in [#3072](https://github.com/PrefectHQ/fastmcp/pull/3072)
- Infer MIME types from OpenAPI response definitions by [@jlowin](https://github.com/jlowin) in [#3101](https://github.com/PrefectHQ/fastmcp/pull/3101)
- Remove require\_auth in favor of scope-based authorization by [@jlowin](https://github.com/jlowin) in [#3103](https://github.com/PrefectHQ/fastmcp/pull/3103)

### [​](#fixes--15) Fixes 🐞

- Fix FastAPI mounting examples in docs by [@jlowin](https://github.com/jlowin) in [#2962](https://github.com/PrefectHQ/fastmcp/pull/2962)
- Remove outdated ‘FastMCP 3.0 is coming!’ CLI banner by [@jlowin](https://github.com/jlowin) in [#2974](https://github.com/PrefectHQ/fastmcp/pull/2974)
- Pin httpx `< 1.0` and simplify beta install docs by [@jlowin](https://github.com/jlowin) in [#2975](https://github.com/PrefectHQ/fastmcp/pull/2975)
- Add enabled field to ToolTransformConfig by [@jlowin](https://github.com/jlowin) in [#2991](https://github.com/PrefectHQ/fastmcp/pull/2991)
- fix phue2 import in smart\_home example by [@zzstoatzz](https://github.com/zzstoatzz) in [#2999](https://github.com/PrefectHQ/fastmcp/pull/2999)
- fix: broaden combine\_lifespans type to accept Mapping return types by [@aminsamir45](https://github.com/aminsamir45) in [#3005](https://github.com/PrefectHQ/fastmcp/pull/3005)
- fix: type narrowing for skills resource contents by [@strawgate](https://github.com/strawgate) in [#3023](https://github.com/PrefectHQ/fastmcp/pull/3023)
- fix: correctly send resource when exchanging code for the upstream by [@JonasKs](https://github.com/JonasKs) in [#3013](https://github.com/PrefectHQ/fastmcp/pull/3013)
- MCP Apps: structured CSP/permissions types, resource meta propagation fix, QR example by [@jlowin](https://github.com/jlowin) in [#3031](https://github.com/PrefectHQ/fastmcp/pull/3031)
- chore: upgrade python-multipart to 0.0.22 (CVE-2026-24486) by [@jlowin](https://github.com/jlowin) in [#3042](https://github.com/PrefectHQ/fastmcp/pull/3042)
- chore: upgrade protobuf to 6.33.5 (CVE-2026-0994) by [@jlowin](https://github.com/jlowin) in [#3043](https://github.com/PrefectHQ/fastmcp/pull/3043)
- fix: use MCP spec error code -32002 for resource not found by [@jlowin](https://github.com/jlowin) in [#3041](https://github.com/PrefectHQ/fastmcp/pull/3041)
- Fix tool\_choice reset for structured output sampling by [@strawgate](https://github.com/strawgate) in [#3014](https://github.com/PrefectHQ/fastmcp/pull/3014)
- Fix workflow notification URL formatting in upgrade checks by [@strawgate](https://github.com/strawgate) in [#3047](https://github.com/PrefectHQ/fastmcp/pull/3047)
- Fix Field() handling in prompts by [@strawgate](https://github.com/strawgate) in [#3050](https://github.com/PrefectHQ/fastmcp/pull/3050)
- fix: use SkipJsonSchema to exclude callable fields from JSON schema generation by [@strawgate](https://github.com/strawgate) in [#3048](https://github.com/PrefectHQ/fastmcp/pull/3048)
- fix: Preserve metadata in FastMCPProvider component wrappers by [@NeelayS](https://github.com/NeelayS) in [#3057](https://github.com/PrefectHQ/fastmcp/pull/3057)
- Mock network calls in CLI tests and use MemoryStore for OAuth tests by [@strawgate](https://github.com/strawgate) in [#3051](https://github.com/PrefectHQ/fastmcp/pull/3051)
- Remove OpenAPI timeout parameter, make client optional, surface timeout errors by [@jlowin](https://github.com/jlowin) in [#3067](https://github.com/PrefectHQ/fastmcp/pull/3067)
- fix: enforce redirect URI validation when allowed\_client\_redirect\_uris is supplied by [@nathanwelsh8](https://github.com/nathanwelsh8) in [#3066](https://github.com/PrefectHQ/fastmcp/pull/3066)
- Fix —reload port conflict when using explicit port by [@jlowin](https://github.com/jlowin) in [#3070](https://github.com/PrefectHQ/fastmcp/pull/3070)
- Fix compress\_schema to preserve additionalProperties: false for MCP compatibility by [@jlowin](https://github.com/jlowin) in [#3102](https://github.com/PrefectHQ/fastmcp/pull/3102)
- Fix CIMD redirect allowlist bypass and cache revalidation by [@jlowin](https://github.com/jlowin) in [#3098](https://github.com/PrefectHQ/fastmcp/pull/3098)
- Exclude content-type from get\_http\_headers() to prevent HTTP 415 errors by [@jlowin](https://github.com/jlowin) in [#3104](https://github.com/PrefectHQ/fastmcp/pull/3104)

### [​](#docs--12) Docs 📚

- Prepare docs for v3.0 beta release by [@jlowin](https://github.com/jlowin) in [#2954](https://github.com/PrefectHQ/fastmcp/pull/2954)
- Restructure docs: move transforms to dedicated section by [@jlowin](https://github.com/jlowin) in [#2956](https://github.com/PrefectHQ/fastmcp/pull/2956)
- Remove unnecessary pip warning by [@jlowin](https://github.com/jlowin) in [#2958](https://github.com/PrefectHQ/fastmcp/pull/2958)
- Update example MCP version in installation docs by [@jlowin](https://github.com/jlowin) in [#2959](https://github.com/PrefectHQ/fastmcp/pull/2959)
- Update brand images by [@jlowin](https://github.com/jlowin) in [#2960](https://github.com/PrefectHQ/fastmcp/pull/2960)
- Restructure README and welcome page with motivated narrative by [@jlowin](https://github.com/jlowin) in [#2963](https://github.com/PrefectHQ/fastmcp/pull/2963)
- Restructure README and docs with motivated narrative by [@jlowin](https://github.com/jlowin) in [#2964](https://github.com/PrefectHQ/fastmcp/pull/2964)
- Favicon update and Prefect Horizon docs by [@jlowin](https://github.com/jlowin) in [#2978](https://github.com/PrefectHQ/fastmcp/pull/2978)
- Add dependency injection documentation and DI-style dependencies by [@jlowin](https://github.com/jlowin) in [#2980](https://github.com/PrefectHQ/fastmcp/pull/2980)
- docs: document expanded reload behavior and restructure beta sections by [@jlowin](https://github.com/jlowin) in [#3039](https://github.com/PrefectHQ/fastmcp/pull/3039)
- Add output\_schema caveat to response limiting docs by [@jlowin](https://github.com/jlowin) in [#3099](https://github.com/PrefectHQ/fastmcp/pull/3099)
- Document token passthrough security in OAuth Proxy docs by [@jlowin](https://github.com/jlowin) in [#3100](https://github.com/PrefectHQ/fastmcp/pull/3100)

### [​](#dependencies--8) Dependencies 📦

- Bump ty from 0.0.12 to 0.0.13 by @dependabot in [#2984](https://github.com/PrefectHQ/fastmcp/pull/2984)
- Bump prek from 0.2.30 to 0.3.0 by @dependabot in [#2982](https://github.com/PrefectHQ/fastmcp/pull/2982)

### [​](#other-changes--5) Other Changes 🦾

- Normalize resource URLs before comparison to support RFC 8707 query parameters by [@abhijeethp](https://github.com/abhijeethp) in [#2967](https://github.com/PrefectHQ/fastmcp/pull/2967)
- Bump pydocket to 0.17.2 (memory leak fix) by [@chrisguidry](https://github.com/chrisguidry) in [#2998](https://github.com/PrefectHQ/fastmcp/pull/2998)
- Add AzureJWTVerifier for Managed Identity token verification by [@jlowin](https://github.com/jlowin) in [#3058](https://github.com/PrefectHQ/fastmcp/pull/3058)
- Add release notes for v2.14.4 and v2.14.5 by [@jlowin](https://github.com/jlowin) in [#3064](https://github.com/PrefectHQ/fastmcp/pull/3064)
- Add missing beta2 features to v3 release tracking by [@jlowin](https://github.com/jlowin) in [#3105](https://github.com/PrefectHQ/fastmcp/pull/3105)

## [​](#new-contributors-9) New Contributors

- [@abhijeethp](https://github.com/abhijeethp) made their first contribution in [#2967](https://github.com/PrefectHQ/fastmcp/pull/2967)
- [@aminsamir45](https://github.com/aminsamir45) made their first contribution in [#3005](https://github.com/PrefectHQ/fastmcp/pull/3005)
- [@JonasKs](https://github.com/JonasKs) made their first contribution in [#2997](https://github.com/PrefectHQ/fastmcp/pull/2997)
- [@NeelayS](https://github.com/NeelayS) made their first contribution in [#3057](https://github.com/PrefectHQ/fastmcp/pull/3057)
- [@gfortaine](https://github.com/gfortaine) made their first contribution in [#2905](https://github.com/PrefectHQ/fastmcp/pull/2905)
- [@nathanwelsh8](https://github.com/nathanwelsh8) made their first contribution in [#3066](https://github.com/PrefectHQ/fastmcp/pull/3066)
- [@dgenio](https://github.com/dgenio) made their first contribution in [#2885](https://github.com/PrefectHQ/fastmcp/pull/2885)

**Full Changelog**: [https://github.com/PrefectHQ/fastmcp/compare/v3.0.0b1…v3.0.0b2](https://github.com/PrefectHQ/fastmcp/compare/v3.0.0b1...v3.0.0b2)

[​](#v3-0-0b1)

v3.0.0b1

2026-01-20

**[v3.0.0b1: This Beta Work](https://github.com/PrefectHQ/fastmcp/releases/tag/v3.0.0b1)**FastMCP 3.0 rebuilds the framework around three primitives: components, providers, and transforms. Providers source components dynamically—from decorators, filesystems, OpenAPI specs, remote servers, or anywhere else. Transforms modify components as they flow to clients—renaming, namespacing, filtering, securing. The features that required specialized subsystems in v2 now compose naturally from these building blocks.🔌 **Provider Architecture** unifies how components are sourced. `FileSystemProvider` discovers decorated functions from directories with optional hot-reload. `SkillsProvider` exposes agent skill files as MCP resources. `OpenAPIProvider` and `ProxyProvider` get cleaner integrations. Providers are composable—share one across servers, or attach many to one server.🔄 **Transforms** add middleware for components. Namespace mounted servers, rename verbose tools, filter by version, control visibility—all without touching source code. `ResourcesAsTools` and `PromptsAsTools` expose non-tool components to tool-only clients.📋 **Component Versioning** lets you register `@tool(version="2.0")` alongside older versions. Clients see the highest version by default but can request specific versions. `VersionFilter` serves different API versions from one codebase.💾 **Session-Scoped State** persists across requests. `await ctx.set_state()` and `await ctx.get_state()` now survive the full session. Per-session visibility via `ctx.enable_components()` lets servers adapt dynamically to each client.⚡ **DX Improvements** include `--reload` for auto-restart during development, automatic threadpool dispatch for sync functions, tool timeouts, pagination for large component lists, and OpenTelemetry tracing.🔐 **Component Authorization** via `@tool(auth=require_scopes("admin"))` and `AuthMiddleware` for server-wide policies.Breaking changes are minimal: for most servers, updating the import statement is all you need. See the [migration guide](https://github.com/PrefectHQ/fastmcp/blob/main/docs/getting-started/upgrading/from-fastmcp-2.mdx) for details.

## [​](#what’s-changed-4) What’s Changed

### [​](#new-features--7) New Features 🎉

- Refactor resource behavior and add meta support by [@jlowin](https://github.com/jlowin) in [#2611](https://github.com/PrefectHQ/fastmcp/pull/2611)
- Refactor prompt behavior and add meta support by [@jlowin](https://github.com/jlowin) in [#2610](https://github.com/PrefectHQ/fastmcp/pull/2610)
- feat: Provider abstraction for dynamic MCP components by [@jlowin](https://github.com/jlowin) in [#2622](https://github.com/PrefectHQ/fastmcp/pull/2622)
- Unify component storage in LocalProvider by [@jlowin](https://github.com/jlowin) in [#2680](https://github.com/PrefectHQ/fastmcp/pull/2680)
- Introduce ResourceResult as canonical resource return type by [@jlowin](https://github.com/jlowin) in [#2734](https://github.com/PrefectHQ/fastmcp/pull/2734)
- Introduce Message and PromptResult as canonical prompt types by [@jlowin](https://github.com/jlowin) in [#2738](https://github.com/PrefectHQ/fastmcp/pull/2738)
- Add —reload flag for auto-restart on file changes by [@jlowin](https://github.com/jlowin) in [#2816](https://github.com/PrefectHQ/fastmcp/pull/2816)
- Add FileSystemProvider for filesystem-based component discovery by [@jlowin](https://github.com/jlowin) in [#2823](https://github.com/PrefectHQ/fastmcp/pull/2823)
- Add standalone decorators and eliminate fastmcp.fs module by [@jlowin](https://github.com/jlowin) in [#2832](https://github.com/PrefectHQ/fastmcp/pull/2832)
- Add authorization checks to components and servers by [@jlowin](https://github.com/jlowin) in [#2855](https://github.com/PrefectHQ/fastmcp/pull/2855)
- Decorators return functions instead of component objects by [@jlowin](https://github.com/jlowin) in [#2856](https://github.com/PrefectHQ/fastmcp/pull/2856)
- Add transform system for modifying components in provider chains by [@jlowin](https://github.com/jlowin) in [#2836](https://github.com/PrefectHQ/fastmcp/pull/2836)
- Add OpenTelemetry tracing support by [@chrisguidry](https://github.com/chrisguidry) in [#2869](https://github.com/PrefectHQ/fastmcp/pull/2869)
- Add component versioning and VersionFilter transform by [@jlowin](https://github.com/jlowin) in [#2894](https://github.com/PrefectHQ/fastmcp/pull/2894)
- Add version discovery and calling a certain version for components by [@jlowin](https://github.com/jlowin) in [#2897](https://github.com/PrefectHQ/fastmcp/pull/2897)
- Refactor visibility to mark-based enabled system by [@jlowin](https://github.com/jlowin) in [#2912](https://github.com/PrefectHQ/fastmcp/pull/2912)
- Add session-specific visibility control via Context by [@jlowin](https://github.com/jlowin) in [#2917](https://github.com/PrefectHQ/fastmcp/pull/2917)
- Add Skills Provider for exposing agent skills as MCP resources by [@jlowin](https://github.com/jlowin) in [#2944](https://github.com/PrefectHQ/fastmcp/pull/2944)

### [​](#enhancements--6) Enhancements 🔧

- Convert mounted servers to MountedProvider by [@jlowin](https://github.com/jlowin) in [#2635](https://github.com/PrefectHQ/fastmcp/pull/2635)
- Simplify .key as computed property by [@jlowin](https://github.com/jlowin) in [#2648](https://github.com/PrefectHQ/fastmcp/pull/2648)
- Refactor MountedProvider into FastMCPProvider + TransformingProvider by [@jlowin](https://github.com/jlowin) in [#2653](https://github.com/PrefectHQ/fastmcp/pull/2653)
- Enable background task support for custom component subclasses by [@jlowin](https://github.com/jlowin) in [#2657](https://github.com/PrefectHQ/fastmcp/pull/2657)
- Use CreateTaskResult for background task creation by [@jlowin](https://github.com/jlowin) in [#2660](https://github.com/PrefectHQ/fastmcp/pull/2660)
- Refactor provider execution: components own their execution by [@jlowin](https://github.com/jlowin) in [#2663](https://github.com/PrefectHQ/fastmcp/pull/2663)
- Add supports\_tasks() method to replace string mode checks by [@jlowin](https://github.com/jlowin) in [#2664](https://github.com/PrefectHQ/fastmcp/pull/2664)
- Replace type: ignore[attr-defined] with isinstance assertions in tests by [@jlowin](https://github.com/jlowin) in [#2665](https://github.com/PrefectHQ/fastmcp/pull/2665)
- Add poll\_interval to TaskConfig by [@jlowin](https://github.com/jlowin) in [#2666](https://github.com/PrefectHQ/fastmcp/pull/2666)
- Refactor task module: rename protocol.py to requests.py and reduce redundancy by [@jlowin](https://github.com/jlowin) in [#2667](https://github.com/PrefectHQ/fastmcp/pull/2667)
- Refactor FastMCPProxy into ProxyProvider by [@jlowin](https://github.com/jlowin) in [#2669](https://github.com/PrefectHQ/fastmcp/pull/2669)
- Move OpenAPI to providers/openapi submodule by [@jlowin](https://github.com/jlowin) in [#2672](https://github.com/PrefectHQ/fastmcp/pull/2672)
- Use ergonomic provider initialization pattern by [@jlowin](https://github.com/jlowin) in [#2675](https://github.com/PrefectHQ/fastmcp/pull/2675)
- Fix ty 0.0.5 type errors by [@jlowin](https://github.com/jlowin) in [#2676](https://github.com/PrefectHQ/fastmcp/pull/2676)
- Remove execution methods from Provider base class by [@jlowin](https://github.com/jlowin) in [#2681](https://github.com/PrefectHQ/fastmcp/pull/2681)
- Add type-prefixed keys for globally unique component identification by [@jlowin](https://github.com/jlowin) in [#2704](https://github.com/PrefectHQ/fastmcp/pull/2704)
- Skip parallel MCP config test on Windows by [@jlowin](https://github.com/jlowin) in [#2711](https://github.com/PrefectHQ/fastmcp/pull/2711)
- Consolidate notification system with unified API by [@jlowin](https://github.com/jlowin) in [#2710](https://github.com/PrefectHQ/fastmcp/pull/2710)
- Skip test\_multi\_client on Windows by [@jlowin](https://github.com/jlowin) in [#2714](https://github.com/PrefectHQ/fastmcp/pull/2714)
- Parallelize provider operations by [@jlowin](https://github.com/jlowin) in [#2716](https://github.com/PrefectHQ/fastmcp/pull/2716)
- Consolidate get\_\* and *list*\* methods into single API by [@jlowin](https://github.com/jlowin) in [#2719](https://github.com/PrefectHQ/fastmcp/pull/2719)
- Consolidate execution method chains into single public API by [@jlowin](https://github.com/jlowin) in [#2728](https://github.com/PrefectHQ/fastmcp/pull/2728)
- Add documentation check to required PR workflow by [@jlowin](https://github.com/jlowin) in [#2730](https://github.com/PrefectHQ/fastmcp/pull/2730)
- Parallelize list\_\* calls in Provider.get\_tasks() by [@jlowin](https://github.com/jlowin) in [#2731](https://github.com/PrefectHQ/fastmcp/pull/2731)
- Consistent decorator-based MCP handler registration by [@jlowin](https://github.com/jlowin) in [#2732](https://github.com/PrefectHQ/fastmcp/pull/2732)
- Make ToolResult a BaseModel for serialization support by [@jlowin](https://github.com/jlowin) in [#2736](https://github.com/PrefectHQ/fastmcp/pull/2736)
- Align prompt handler with resource pattern by [@jlowin](https://github.com/jlowin) in [#2740](https://github.com/PrefectHQ/fastmcp/pull/2740)
- Update classes to inherit from FastMCPBaseModel instead of BaseModel by [@jlowin](https://github.com/jlowin) in [#2739](https://github.com/PrefectHQ/fastmcp/pull/2739)
- Convert provider tests to use direct server calls by [@jlowin](https://github.com/jlowin) in [#2748](https://github.com/PrefectHQ/fastmcp/pull/2748)
- Add explicit task\_meta parameter to FastMCP.call\_tool() by [@jlowin](https://github.com/jlowin) in [#2749](https://github.com/PrefectHQ/fastmcp/pull/2749)
- Add task\_meta parameter to read\_resource() for explicit task control by [@jlowin](https://github.com/jlowin) in [#2750](https://github.com/PrefectHQ/fastmcp/pull/2750)
- Add task\_meta to prompts and centralize fn\_key enrichment by [@jlowin](https://github.com/jlowin) in [#2751](https://github.com/PrefectHQ/fastmcp/pull/2751)
- Remove unused include\_tags/exclude\_tags settings by [@jlowin](https://github.com/jlowin) in [#2756](https://github.com/PrefectHQ/fastmcp/pull/2756)
- Parallelize provider access when executing components by [@jlowin](https://github.com/jlowin) in [#2744](https://github.com/PrefectHQ/fastmcp/pull/2744)
- Add tests for OAuth generator cleanup and use aclosing by [@jlowin](https://github.com/jlowin) in [#2759](https://github.com/PrefectHQ/fastmcp/pull/2759)
- Deprecate tool\_serializer parameter by [@jlowin](https://github.com/jlowin) in [#2753](https://github.com/PrefectHQ/fastmcp/pull/2753)
- Feature/supabase custom auth route by [@EloiZalczer](https://github.com/EloiZalczer) in [#2632](https://github.com/PrefectHQ/fastmcp/pull/2632)
- Add regression tests for caching with mounted server prefixes by [@jlowin](https://github.com/jlowin) in [#2762](https://github.com/PrefectHQ/fastmcp/pull/2762)
- Update CLI banner with FastMCP 3.0 notice by [@jlowin](https://github.com/jlowin) in [#2766](https://github.com/PrefectHQ/fastmcp/pull/2766)
- Make FASTMCP\_SHOW\_SERVER\_BANNER apply to all server startup methods by [@jlowin](https://github.com/jlowin) in [#2771](https://github.com/PrefectHQ/fastmcp/pull/2771)
- Add MCP tool annotations to smart\_home example by [@triepod-ai](https://github.com/triepod-ai) in [#2777](https://github.com/PrefectHQ/fastmcp/pull/2777)
- Cherry-pick debug logging for OAuth token expiry to main by [@jlowin](https://github.com/jlowin) in [#2797](https://github.com/PrefectHQ/fastmcp/pull/2797)
- Turn off negative CLI flags by default by [@jlowin](https://github.com/jlowin) in [#2801](https://github.com/PrefectHQ/fastmcp/pull/2801)
- Configure ty to fail on warnings by [@jlowin](https://github.com/jlowin) in [#2804](https://github.com/PrefectHQ/fastmcp/pull/2804)
- Dereference $ref in tool schemas for MCP client compatibility by [@jlowin](https://github.com/jlowin) in [#2814](https://github.com/PrefectHQ/fastmcp/pull/2814)
- Add v3.0 feature tracking document by [@jlowin](https://github.com/jlowin) in [#2822](https://github.com/PrefectHQ/fastmcp/pull/2822)
- Remove deprecated WSTransport by [@jlowin](https://github.com/jlowin) in [#2826](https://github.com/PrefectHQ/fastmcp/pull/2826)
- Add composable lifespans by [@jlowin](https://github.com/jlowin) in [#2828](https://github.com/PrefectHQ/fastmcp/pull/2828)
- Replace FastMCP.as\_proxy() with create\_proxy() function by [@jlowin](https://github.com/jlowin) in [#2829](https://github.com/PrefectHQ/fastmcp/pull/2829)
- Add docs-broken-links command and fix docstring markdown parsing by [@jlowin](https://github.com/jlowin) in [#2830](https://github.com/PrefectHQ/fastmcp/pull/2830)
- Add PingMiddleware for keepalive connections by [@jlowin](https://github.com/jlowin) in [#2838](https://github.com/PrefectHQ/fastmcp/pull/2838)
- Add CLI update notifications by [@jlowin](https://github.com/jlowin) in [#2840](https://github.com/PrefectHQ/fastmcp/pull/2840)
- Add agent skills for testing and code review by [@jlowin](https://github.com/jlowin) in [#2846](https://github.com/PrefectHQ/fastmcp/pull/2846)
- Add loq pre-commit hook for file size enforcement by [@jlowin](https://github.com/jlowin) in [#2847](https://github.com/PrefectHQ/fastmcp/pull/2847)
- Add transport property to Context by [@jlowin](https://github.com/jlowin) in [#2850](https://github.com/PrefectHQ/fastmcp/pull/2850)
- Add loq file size limits and clean up type ignores by [@jlowin](https://github.com/jlowin) in [#2859](https://github.com/PrefectHQ/fastmcp/pull/2859)
- Run sync tools/resources/prompts in threadpool automatically by [@jlowin](https://github.com/jlowin) in [#2865](https://github.com/PrefectHQ/fastmcp/pull/2865)
- Add timeout parameter for tool foreground execution by [@jlowin](https://github.com/jlowin) in [#2872](https://github.com/PrefectHQ/fastmcp/pull/2872)
- Adopt OpenTelemetry MCP semantic conventions by [@chrisguidry](https://github.com/chrisguidry) in [#2886](https://github.com/PrefectHQ/fastmcp/pull/2886)
- Add client\_secret\_post authentication to IntrospectionTokenVerifier by [@shulkx](https://github.com/shulkx) in [#2884](https://github.com/PrefectHQ/fastmcp/pull/2884)
- Add enable\_rich\_logging setting to disable rich formatting by [@strawgate](https://github.com/strawgate) in [#2893](https://github.com/PrefectHQ/fastmcp/pull/2893)
- Rename \_fastmcp metadata namespace to fastmcp and make non-optional by [@jlowin](https://github.com/jlowin) in [#2895](https://github.com/PrefectHQ/fastmcp/pull/2895)
- Refactor FastMCP to inherit from Provider by [@jlowin](https://github.com/jlowin) in [#2901](https://github.com/PrefectHQ/fastmcp/pull/2901)
- Swap public/private method naming in Provider by [@jlowin](https://github.com/jlowin) in [#2902](https://github.com/PrefectHQ/fastmcp/pull/2902)
- Add MCP-compliant pagination support by [@jlowin](https://github.com/jlowin) in [#2903](https://github.com/PrefectHQ/fastmcp/pull/2903)
- Support VersionSpec in enable/disable for range-based filtering by [@jlowin](https://github.com/jlowin) in [#2914](https://github.com/PrefectHQ/fastmcp/pull/2914)
- Remove sync notification infrastructure by [@jlowin](https://github.com/jlowin) in [#2915](https://github.com/PrefectHQ/fastmcp/pull/2915)
- Immutable transform wrapping for providers by [@jlowin](https://github.com/jlowin) in [#2913](https://github.com/PrefectHQ/fastmcp/pull/2913)
- Unify discovery API: deduplicate at protocol layer only by [@jlowin](https://github.com/jlowin) in [#2919](https://github.com/PrefectHQ/fastmcp/pull/2919)
- Split transports.py into modular structure by [@jlowin](https://github.com/jlowin) in [#2921](https://github.com/PrefectHQ/fastmcp/pull/2921)
- Move session visibility logic to enabled.py by [@jlowin](https://github.com/jlowin) in [#2924](https://github.com/PrefectHQ/fastmcp/pull/2924)
- Refactor Client class into mixins and add timeout utilities by [@jlowin](https://github.com/jlowin) in [#2933](https://github.com/PrefectHQ/fastmcp/pull/2933)
- Refactor OAuthProxy into focused modules by [@jlowin](https://github.com/jlowin) in [#2935](https://github.com/PrefectHQ/fastmcp/pull/2935)
- Refactor LocalProvider into mixin modules by [@jlowin](https://github.com/jlowin) in [#2936](https://github.com/PrefectHQ/fastmcp/pull/2936)
- Refactor server.py into mixins by [@jlowin](https://github.com/jlowin) in [#2939](https://github.com/PrefectHQ/fastmcp/pull/2939)
- Consolidate test fixtures and refactor large test files by [@jlowin](https://github.com/jlowin) in [#2941](https://github.com/PrefectHQ/fastmcp/pull/2941)
- Refactor transform list methods to pure function pattern by [@jlowin](https://github.com/jlowin) in [#2942](https://github.com/PrefectHQ/fastmcp/pull/2942)
- Add ResourcesAsTools transform by [@jlowin](https://github.com/jlowin) in [#2943](https://github.com/PrefectHQ/fastmcp/pull/2943)
- Add PromptsAsTools transform by [@jlowin](https://github.com/jlowin) in [#2946](https://github.com/PrefectHQ/fastmcp/pull/2946)
- Add client utilities for downloading skills by [@jlowin](https://github.com/jlowin) in [#2948](https://github.com/PrefectHQ/fastmcp/pull/2948)
- Rename Enabled transform to Visibility by [@jlowin](https://github.com/jlowin) in [#2950](https://github.com/PrefectHQ/fastmcp/pull/2950)

### [​](#fixes--16) Fixes 🐞

- Let FastMCPError propagate from dependencies by [@chrisguidry](https://github.com/chrisguidry) in [#2646](https://github.com/PrefectHQ/fastmcp/pull/2646)
- Fix task execution for tools with custom names by [@chrisguidry](https://github.com/chrisguidry) in [#2645](https://github.com/PrefectHQ/fastmcp/pull/2645)
- fix: check the cause of the tool error by [@rjolaverria](https://github.com/rjolaverria) in [#2674](https://github.com/PrefectHQ/fastmcp/pull/2674)
- Bump pydocket to 0.16.3 for task cancellation support by [@chrisguidry](https://github.com/chrisguidry) in [#2683](https://github.com/PrefectHQ/fastmcp/pull/2683)
- Fix uvicorn 0.39+ test timeouts and FastMCPError propagation by [@jlowin](https://github.com/jlowin) in [#2699](https://github.com/PrefectHQ/fastmcp/pull/2699)
- Fix Prefect website URL in docs footer by [@mgoldsborough](https://github.com/mgoldsborough) in [#2701](https://github.com/PrefectHQ/fastmcp/pull/2701)
- Fix: resolve root-level $ref in outputSchema for MCP spec compliance by [@majiayu000](https://github.com/majiayu000) in [#2720](https://github.com/PrefectHQ/fastmcp/pull/2720)
- Fix Provider.get\_tasks() to include custom component subclasses by [@jlowin](https://github.com/jlowin) in [#2729](https://github.com/PrefectHQ/fastmcp/pull/2729)
- Fix Proxy provider to return all resource contents by [@jlowin](https://github.com/jlowin) in [#2742](https://github.com/PrefectHQ/fastmcp/pull/2742)
- Fix prompt return type documentation by [@jlowin](https://github.com/jlowin) in [#2741](https://github.com/PrefectHQ/fastmcp/pull/2741)
- fix: Client OAuth async\_auth\_flow() method causing MCP-SDK self.context.lock error. by [@lgndluke](https://github.com/lgndluke) in [#2644](https://github.com/PrefectHQ/fastmcp/pull/2644)
- Fix rate limit detection during teardown phase by [@jlowin](https://github.com/jlowin) in [#2757](https://github.com/PrefectHQ/fastmcp/pull/2757)
- fix: set pytest-asyncio default fixture loop scope to function by [@jlowin](https://github.com/jlowin) in [#2758](https://github.com/PrefectHQ/fastmcp/pull/2758)
- Fix OAuth Proxy resource parameter validation by [@jlowin](https://github.com/jlowin) in [#2764](https://github.com/PrefectHQ/fastmcp/pull/2764)
- [BugFix] Fix `openapi_version` Check So 3.1 Is Included by [@deeleeramone](https://github.com/deeleeramone) in [#2768](https://github.com/PrefectHQ/fastmcp/pull/2768)
- Fix titled enum elicitation schema to comply with MCP spec by [@jlowin](https://github.com/jlowin) in [#2773](https://github.com/PrefectHQ/fastmcp/pull/2773)
- Fix base\_url fallback when url is not set by [@bhbs](https://github.com/bhbs) in [#2776](https://github.com/PrefectHQ/fastmcp/pull/2776)
- Lazy import DiskStore to avoid sqlite3 dependency on import by [@jlowin](https://github.com/jlowin) in [#2784](https://github.com/PrefectHQ/fastmcp/pull/2784)
- Fix OAuth token storage TTL calculation by [@jlowin](https://github.com/jlowin) in [#2796](https://github.com/PrefectHQ/fastmcp/pull/2796)
- Use consistent refresh\_ttl for JTI mapping store by [@jlowin](https://github.com/jlowin) in [#2799](https://github.com/PrefectHQ/fastmcp/pull/2799)
- Return 401 for invalid\_grant token errors per MCP spec by [@jlowin](https://github.com/jlowin) in [#2800](https://github.com/PrefectHQ/fastmcp/pull/2800)
- Fix client hanging on HTTP 4xx/5xx errors by [@jlowin](https://github.com/jlowin) in [#2803](https://github.com/PrefectHQ/fastmcp/pull/2803)
- Fix unawaited coroutine warning and treat as test error by [@jlowin](https://github.com/jlowin) in [#2806](https://github.com/PrefectHQ/fastmcp/pull/2806)
- Fix keep\_alive passthrough in StdioMCPServer.to\_transport() by [@jlowin](https://github.com/jlowin) in [#2791](https://github.com/PrefectHQ/fastmcp/pull/2791)
- Dereference $ref in tool schemas for MCP client compatibility by [@jlowin](https://github.com/jlowin) in [#2808](https://github.com/PrefectHQ/fastmcp/pull/2808)
- Prefix Redis keys with docket name for ACL isolation by [@chrisguidry](https://github.com/chrisguidry) in [#2811](https://github.com/PrefectHQ/fastmcp/pull/2811)
- fix smart\_home example: HueAttributes schema and deprecated prefix by [@zzstoatzz](https://github.com/zzstoatzz) in [#2818](https://github.com/PrefectHQ/fastmcp/pull/2818)
- Fix redirect URI validation docs to match implementation by [@jlowin](https://github.com/jlowin) in [#2824](https://github.com/PrefectHQ/fastmcp/pull/2824)
- Fix timeout not propagating to proxy clients in multi-server MCPConfig by [@jlowin](https://github.com/jlowin) in [#2809](https://github.com/PrefectHQ/fastmcp/pull/2809)
- Fix ContextVar propagation for ASGI-mounted servers with tasks by [@chrisguidry](https://github.com/chrisguidry) in [#2844](https://github.com/PrefectHQ/fastmcp/pull/2844)
- Fix HTTP transport timeout defaulting to 5 seconds by [@jlowin](https://github.com/jlowin) in [#2849](https://github.com/PrefectHQ/fastmcp/pull/2849)
- Fix decorator error messages to link to correct doc pages by [@jlowin](https://github.com/jlowin) in [#2858](https://github.com/PrefectHQ/fastmcp/pull/2858)
- Fix task capabilities location (issue #2870) by [@jlowin](https://github.com/jlowin) in [#2875](https://github.com/PrefectHQ/fastmcp/pull/2875)
- Bump the uv group across 1 directory with 2 updates by [@dependabot](https://github.com/dependabot)[bot] in [#2890](https://github.com/PrefectHQ/fastmcp/pull/2890)

### [​](#breaking-changes--3) Breaking Changes 🛫

- Add VisibilityFilter for hierarchical enable/disable by [@jlowin](https://github.com/jlowin) in [#2708](https://github.com/PrefectHQ/fastmcp/pull/2708)
- Remove automatic environment variable loading from auth providers by [@jlowin](https://github.com/jlowin) in [#2752](https://github.com/PrefectHQ/fastmcp/pull/2752)
- Make pydocket optional and unify DI systems by [@jlowin](https://github.com/jlowin) in [#2835](https://github.com/PrefectHQ/fastmcp/pull/2835)
- Add session-scoped state persistence by [@jlowin](https://github.com/jlowin) in [#2873](https://github.com/PrefectHQ/fastmcp/pull/2873)

### [​](#docs--13) Docs 📚

- Undocumented `McpError` exceptions by [@ivanbelenky](https://github.com/ivanbelenky) in [#2656](https://github.com/PrefectHQ/fastmcp/pull/2656)
- docs(server): add http to transport options in run() method docstring by [@Ashif4354](https://github.com/Ashif4354) in [#2707](https://github.com/PrefectHQ/fastmcp/pull/2707)
- Add v3 breaking changes notice to README by [@jlowin](https://github.com/jlowin) in [#2712](https://github.com/PrefectHQ/fastmcp/pull/2712)
- Add changelog entries for v2.13.1 through v2.14.1 by [@jlowin](https://github.com/jlowin) in [#2725](https://github.com/PrefectHQ/fastmcp/pull/2725)
- Reorganize docs around provider architecture by [@jlowin](https://github.com/jlowin) in [#2723](https://github.com/PrefectHQ/fastmcp/pull/2723)
- Fix documentation to use ‘meta’ instead of ‘\_meta’ for MCP spec field by [@jlowin](https://github.com/jlowin) in [#2735](https://github.com/PrefectHQ/fastmcp/pull/2735)
- Enhance documentation on tool transformation by [@shea-parkes](https://github.com/shea-parkes) in [#2781](https://github.com/PrefectHQ/fastmcp/pull/2781)
- Add FastMCP 4.0 preview to documentation by [@jlowin](https://github.com/jlowin) in [#2831](https://github.com/PrefectHQ/fastmcp/pull/2831)
- Add release notes for v2.14.2 and v2.14.3 by [@jlowin](https://github.com/jlowin) in [#2852](https://github.com/PrefectHQ/fastmcp/pull/2852)
- Add missing 3.0.0 version badges and document tasks extra by [@jlowin](https://github.com/jlowin) in [#2866](https://github.com/PrefectHQ/fastmcp/pull/2866)
- Fix custom provider docs to show correct interface by [@jlowin](https://github.com/jlowin) in [#2920](https://github.com/PrefectHQ/fastmcp/pull/2920)
- Update v3 features that were missed in PRs by [@jlowin](https://github.com/jlowin) in [#2947](https://github.com/PrefectHQ/fastmcp/pull/2947)
- Restructure documentation for FastMCP 3.0 by [@jlowin](https://github.com/jlowin) in [#2951](https://github.com/PrefectHQ/fastmcp/pull/2951)
- Fix broken documentation links by [@jlowin](https://github.com/jlowin) in [#2952](https://github.com/PrefectHQ/fastmcp/pull/2952)
- Clarify installation for FastMCP 3.0 beta by [@jlowin](https://github.com/jlowin) in [#2953](https://github.com/PrefectHQ/fastmcp/pull/2953)

### [​](#dependencies--9) Dependencies 📦

- Bump peter-evans/create-pull-request from 7 to 8 by [@dependabot](https://github.com/dependabot)[bot] in [#2623](https://github.com/PrefectHQ/fastmcp/pull/2623)
- Bump ty to 0.0.7+ by [@jlowin](https://github.com/jlowin) in [#2737](https://github.com/PrefectHQ/fastmcp/pull/2737)
- Bump the uv group across 1 directory with 4 updates by [@dependabot](https://github.com/dependabot)[bot] in [#2891](https://github.com/PrefectHQ/fastmcp/pull/2891)

## [​](#new-contributors-10) New Contributors

- [@ivanbelenky](https://github.com/ivanbelenky) made their first contribution in [#2656](https://github.com/PrefectHQ/fastmcp/pull/2656)
- [@rjolaverria](https://github.com/rjolaverria) made their first contribution in [#2674](https://github.com/PrefectHQ/fastmcp/pull/2674)
- [@mgoldsborough](https://github.com/mgoldsborough) made their first contribution in [#2701](https://github.com/PrefectHQ/fastmcp/pull/2701)
- [@Ashif4354](https://github.com/Ashif4354) made their first contribution in [#2707](https://github.com/PrefectHQ/fastmcp/pull/2707)
- [@majiayu000](https://github.com/majiayu000) made their first contribution in [#2720](https://github.com/PrefectHQ/fastmcp/pull/2720)
- [@lgndluke](https://github.com/lgndluke) made their first contribution in [#2644](https://github.com/PrefectHQ/fastmcp/pull/2644)
- [@EloiZalczer](https://github.com/EloiZalczer) made their first contribution in [#2632](https://github.com/PrefectHQ/fastmcp/pull/2632)
- [@deeleeramone](https://github.com/deeleeramone) made their first contribution in [#2768](https://github.com/PrefectHQ/fastmcp/pull/2768)
- [@shea-parkes](https://github.com/shea-parkes) made their first contribution in [#2781](https://github.com/PrefectHQ/fastmcp/pull/2781)
- [@triepod-ai](https://github.com/triepod-ai) made their first contribution in [#2777](https://github.com/PrefectHQ/fastmcp/pull/2777)
- [@bhbs](https://github.com/bhbs) made their first contribution in [#2776](https://github.com/PrefectHQ/fastmcp/pull/2776)
- [@shulkx](https://github.com/shulkx) made their first contribution in [#2884](https://github.com/PrefectHQ/fastmcp/pull/2884)

**Full Changelog**: [v2.14.1…v3.0.0b1](https://github.com/PrefectHQ/fastmcp/compare/v2.14.1...v3.0.0b1)

[​](#v2-14-7)

v2.14.7

2026-04-13

**[v2.14.7: Fake It Till You Break It](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.14.7)**A 2.x backport of the fakeredis pin: fakeredis 2.35.0 renamed a connection class that pydocket’s `memory://` backend depended on, crashing `fastmcp[tasks]` installs at startup. This caps `fakeredis<2.35.0` on the 2.x line.

### [​](#fixes--17) Fixes 🐞

- fix(deps): cap fakeredis to `<2.35.0` to prevent startup crash on 2.x by [@vincent067](https://github.com/vincent067) in [#3883](https://github.com/PrefectHQ/fastmcp/pull/3883)

**Full Changelog**: [v2.14.6…v2.14.7](https://github.com/PrefectHQ/fastmcp/compare/v2.14.6...v2.14.7)

[​](#v2-14-6)

v2.14.6

2026-03-27

**[v2.14.6: $Ref Dead Redemption](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.14.6)**v2.14.4 backported `dereference_refs()` but never wired it into the tool schema pipeline — `$ref` and `$defs` were still sent to MCP clients. Now fixed: `compress_schema()` dereferences at both tool schema creation sites, so schemas are fully inlined before reaching clients.

### [​](#fixes--18) Fixes 🐞

- Updated deprecation URL for V2 by [@SrzStephen](https://github.com/SrzStephen) in [#3109](https://github.com/PrefectHQ/fastmcp/pull/3109)
- Use MemoryStore for OAuth proxy tests by [@SrzStephen](https://github.com/SrzStephen) in [#3111](https://github.com/PrefectHQ/fastmcp/pull/3111)
- fix: wire up dereference\_refs() in tool schema pipeline by [@jlowin](https://github.com/jlowin) in [#3170](https://github.com/PrefectHQ/fastmcp/pull/3170)

**Full Changelog**: [v2.14.5…v2.14.6](https://github.com/PrefectHQ/fastmcp/compare/v2.14.5...v2.14.6)

[​](#v2-14-5)

v2.14.5

2026-02-03

**[v2.14.5: Sealed Docket](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.14.5)**Fixes a memory leak in the memory:// docket broker where cancelled tasks accumulated instead of being cleaned up. Bumps pydocket to ≥0.17.2.

## [​](#what’s-changed-5) What’s Changed

### [​](#enhancements--7) Enhancements 🔧

- Bump pydocket to 0.17.2 (memory leak fix) by [@chrisguidry](https://github.com/chrisguidry) in [#2992](https://github.com/PrefectHQ/fastmcp/pull/2992)

**Full Changelog**: [v2.14.4…v2.14.5](https://github.com/PrefectHQ/fastmcp/compare/v2.14.4...v2.14.5)

[​](#v2-14-4)

v2.14.4

2026-01-22

**[v2.14.4: Package Deal](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.14.4)**Fixes a fresh install bug where the packaging library was missing as a direct dependency, plus backports from 3.x for $ref dereferencing in tool schemas and a task capabilities location fix.

## [​](#what’s-changed-6) What’s Changed

### [​](#enhancements--8) Enhancements 🔧

- Add release notes for v2.14.2 and v2.14.3 by [@jlowin](https://github.com/jlowin) in [#2851](https://github.com/PrefectHQ/fastmcp/pull/2851)

### [​](#fixes--19) Fixes 🐞

- Backport: Dereference $ref in tool schemas for MCP client compatibility by [@jlowin](https://github.com/jlowin) in [#2861](https://github.com/PrefectHQ/fastmcp/pull/2861)
- Fix task capabilities location (issue #2870) by [@jlowin](https://github.com/jlowin) in [#2874](https://github.com/PrefectHQ/fastmcp/pull/2874)
- Add missing packaging dependency by [@jlowin](https://github.com/jlowin) in [#2989](https://github.com/PrefectHQ/fastmcp/pull/2989)

**Full Changelog**: [v2.14.3…v2.14.4](https://github.com/PrefectHQ/fastmcp/compare/v2.14.3...v2.14.4)

[​](#v2-14-3)

v2.14.3

2026-01-12

**[v2.14.3: Time After Timeout](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.14.3)**Sometimes five seconds just isn’t enough. This release fixes an HTTP transport bug that was cutting connections short, along with OAuth and Redis fixes, better ASGI support, and CLI update notifications so you never miss a beat.

## [​](#what’s-changed-7) What’s Changed

### [​](#enhancements--9) Enhancements 🔧

- Add debug logging for OAuth token expiry diagnostics by [@jlowin](https://github.com/jlowin) in [#2789](https://github.com/PrefectHQ/fastmcp/pull/2789)
- Add CLI update notifications by [@jlowin](https://github.com/jlowin) in [#2839](https://github.com/PrefectHQ/fastmcp/pull/2839)
- Use pip instead of uv pip in upgrade instructions by [@jlowin](https://github.com/jlowin) in [#2841](https://github.com/PrefectHQ/fastmcp/pull/2841)

### [​](#fixes--20) Fixes 🐞

- Backport OAuth token storage TTL fix to release/2.x by [@jlowin](https://github.com/jlowin) in [#2798](https://github.com/PrefectHQ/fastmcp/pull/2798)
- Prefix Redis keys with docket name for ACL isolation (2.x backport) by [@chrisguidry](https://github.com/chrisguidry) in [#2812](https://github.com/PrefectHQ/fastmcp/pull/2812)
- Fix ContextVar propagation for ASGI-mounted servers with tasks by [@chrisguidry](https://github.com/chrisguidry) in [#2843](https://github.com/PrefectHQ/fastmcp/pull/2843)
- Fix HTTP transport timeout defaulting to 5 seconds by [@jlowin](https://github.com/jlowin) in [#2848](https://github.com/PrefectHQ/fastmcp/pull/2848)

**Full Changelog**: [v2.14.2…v2.14.3](https://github.com/PrefectHQ/fastmcp/compare/v2.14.2...v2.14.3)

[​](#v2-14-2)

v2.14.2

2025-12-31

**[v2.14.2: Port Authority](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.14.2)**FastMCP 2.14.2 brings a wave of community contributions safely into the 2.x line. A variety of important fixes backported from 3.0 work improve OpenAPI 3.1 compatibility, MCP spec compliance for output schemas and elicitation, and correct a subtle base\_url fallback issue. The CLI now gently reminds you that FastMCP 3.0 is on the horizon.

## [​](#what’s-changed-8) What’s Changed

### [​](#enhancements--10) Enhancements 🔧

- Pin MCP under 2.x by [@jlowin](https://github.com/jlowin) in [#2709](https://github.com/PrefectHQ/fastmcp/pull/2709)
- Add auth\_route parameter to SupabaseProvider by [@EloiZalczer](https://github.com/EloiZalczer) in [#2760](https://github.com/PrefectHQ/fastmcp/pull/2760)
- Update CLI banner with FastMCP 3.0 notice by [@jlowin](https://github.com/jlowin) in [#2765](https://github.com/PrefectHQ/fastmcp/pull/2765)

### [​](#fixes--21) Fixes 🐞

- Let FastMCPError propagate unchanged from managers by [@jlowin](https://github.com/jlowin) in [#2697](https://github.com/PrefectHQ/fastmcp/pull/2697)
- Fix test cleanup for uvicorn 0.39+ context isolation by [@jlowin](https://github.com/jlowin) in [#2696](https://github.com/PrefectHQ/fastmcp/pull/2696)
- Bump pydocket to 0.16.3 to fix worker cleanup race condition by [@chrisguidry](https://github.com/chrisguidry) in [#2700](https://github.com/PrefectHQ/fastmcp/pull/2700)
- Fix Prefect website URL in docs footer by [@mgoldsborough](https://github.com/mgoldsborough) in [#2705](https://github.com/PrefectHQ/fastmcp/pull/2705)
- Fix: resolve root-level $ref in outputSchema for MCP spec compliance by [@majiayu000](https://github.com/majiayu000) in [#2727](https://github.com/PrefectHQ/fastmcp/pull/2727)
- Fix OAuth Proxy resource parameter validation by [@jlowin](https://github.com/jlowin) in [#2763](https://github.com/PrefectHQ/fastmcp/pull/2763)
- Fix openapi\_version check to include 3.1 by [@deeleeramone](https://github.com/deeleeramone) in [#2769](https://github.com/PrefectHQ/fastmcp/pull/2769)
- Fix titled enum elicitation schema to comply with MCP spec by [@jlowin](https://github.com/jlowin) in [#2774](https://github.com/PrefectHQ/fastmcp/pull/2774)
- Fix base\_url fallback when url is not set by [@bhbs](https://github.com/bhbs) in [#2782](https://github.com/PrefectHQ/fastmcp/pull/2782)
- Lazy import DiskStore to avoid sqlite3 dependency on import by [@jlowin](https://github.com/jlowin) in [#2785](https://github.com/PrefectHQ/fastmcp/pull/2785)

### [​](#docs--14) Docs 📚

- Add v3 breaking changes notice to README and docs by [@jlowin](https://github.com/jlowin) in [#2713](https://github.com/PrefectHQ/fastmcp/pull/2713)
- Add changelog entries for v2.13.1 through v2.14.1 by [@jlowin](https://github.com/jlowin) in [#2724](https://github.com/PrefectHQ/fastmcp/pull/2724)
- conference to 2.x branch by [@aaazzam](https://github.com/aaazzam) in [#2787](https://github.com/PrefectHQ/fastmcp/pull/2787)

**Full Changelog**: [v2.14.1…v2.14.2](https://github.com/PrefectHQ/fastmcp/compare/v2.14.1...v2.14.2)

[​](#v2-14-1)

v2.14.1

2025-12-15

**[v2.14.1: ‘Tis a Gift to Be Sample](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.14.1)**FastMCP 2.14.1 introduces sampling with tools (SEP-1577), enabling servers to pass tools to `ctx.sample()` for agentic workflows where the LLM can automatically execute tool calls in a loop. The new `ctx.sample_step()` method provides single LLM calls that return `SampleStep` objects for custom control flow, while `result_type` enables structured outputs via validated Pydantic models.🤖 **AnthropicSamplingHandler** joins the existing OpenAI handler, providing multi-provider sampling support out of the box.⚡ **OpenAISamplingHandler promoted** from experimental status—sampling handlers are now production-ready with a unified API.

## [​](#what’s-changed-9) What’s Changed

### [​](#new-features--8) New Features 🎉

- Sampling with tools by [@jlowin](https://github.com/jlowin) in [#2538](https://github.com/PrefectHQ/fastmcp/pull/2538)
- Add AnthropicSamplingHandler by [@jlowin](https://github.com/jlowin) in [#2677](https://github.com/PrefectHQ/fastmcp/pull/2677)

### [​](#enhancements--11) Enhancements 🔧

- Add Python 3.13 to ubuntu CI by [@jlowin](https://github.com/jlowin) in [#2648](https://github.com/PrefectHQ/fastmcp/pull/2648)
- Remove legacy task initialization workaround by [@jlowin](https://github.com/jlowin) in [#2649](https://github.com/PrefectHQ/fastmcp/pull/2649)
- Consolidate session state reset logic by [@jlowin](https://github.com/jlowin) in [#2651](https://github.com/PrefectHQ/fastmcp/pull/2651)
- Unify SamplingHandler; promote OpenAI from experimental by [@jlowin](https://github.com/jlowin) in [#2656](https://github.com/PrefectHQ/fastmcp/pull/2656)
- Add `tool_names` parameter to mount() for name customization by [@jlowin](https://github.com/jlowin) in [#2660](https://github.com/PrefectHQ/fastmcp/pull/2660)
- Use streamable HTTP client API from MCP SDK by [@jlowin](https://github.com/jlowin) in [#2678](https://github.com/PrefectHQ/fastmcp/pull/2678)
- Deprecate `exclude_args` in favor of Depends() by [@jlowin](https://github.com/jlowin) in [#2693](https://github.com/PrefectHQ/fastmcp/pull/2693)

### [​](#fixes--22) Fixes 🐞

- Fix prompt tasks to return mcp.types.PromptMessage by [@jlowin](https://github.com/jlowin) in [#2650](https://github.com/PrefectHQ/fastmcp/pull/2650)
- Fix Windows test warnings by [@jlowin](https://github.com/jlowin) in [#2653](https://github.com/PrefectHQ/fastmcp/pull/2653)
- Cleanup cancelled connection startup by [@jlowin](https://github.com/jlowin) in [#2679](https://github.com/PrefectHQ/fastmcp/pull/2679)
- Fix tool choice bug in sampling examples by [@shawnthapa](https://github.com/shawnthapa) in [#2686](https://github.com/PrefectHQ/fastmcp/pull/2686)

### [​](#docs--15) Docs 📚

- Simplify Docket tip wording by [@chrisguidry](https://github.com/chrisguidry) in [#2662](https://github.com/PrefectHQ/fastmcp/pull/2662)

### [​](#other-changes--6) Other Changes 🦾

- Bump pydocket to ≥0.15.5 by [@jlowin](https://github.com/jlowin) in [#2694](https://github.com/PrefectHQ/fastmcp/pull/2694)

## [​](#new-contributors-11) New Contributors

- [@shawnthapa](https://github.com/shawnthapa) made their first contribution in [#2686](https://github.com/PrefectHQ/fastmcp/pull/2686)

**Full Changelog**: [v2.14.0…v2.14.1](https://github.com/PrefectHQ/fastmcp/compare/v2.14.0...v2.14.1)

[​](#v2-14-0)

v2.14.0

2025-12-11

**[v2.14.0: Task and You Shall Receive](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.14.0)**FastMCP 2.14 begins adopting the MCP 2025-11-25 specification, introducing protocol-native background tasks (SEP-1686) that enable long-running operations to report progress without blocking clients. The experimental OpenAPI parser graduates to standard, the `OpenAISamplingHandler` is promoted from experimental, and deprecated APIs accumulated across the 2.x series are removed.⏳ **Background Tasks** let you add `task=True` to any async tool decorator to run operations in the background with progress tracking. Powered by [Docket](https://github.com/chrisguidry/docket), an enterprise task scheduler handling millions of concurrent tasks daily—in-memory backends work out-of-the-box, and Redis URLs enable persistence and horizontal scaling.🔧 **OpenAPI Parser Promoted** from experimental to standard with improved performance through single-pass schema processing and cleaner abstractions.📋 **MCP 2025-11-25 Specification Support** including SSE polling and event resumability (SEP-1699), multi-select enum elicitation schemas (SEP-1330), default values for elicitation (SEP-1034), and tool name validation at registration time (SEP-986).

## [​](#breaking-changes) Breaking Changes

- Docket is always enabled; task execution is forbidden through proxies
- Task protocol enabled by default
- Removed deprecated settings, imports, and methods accumulated across 2.x series

## [​](#what’s-changed-10) What’s Changed

### [​](#new-features--9) New Features 🎉

- OpenAPI parser is now the default by [@jlowin](https://github.com/jlowin) in [#2583](https://github.com/PrefectHQ/fastmcp/pull/2583)
- Implement SEP-1686: Background Tasks by [@jlowin](https://github.com/jlowin) in [#2550](https://github.com/PrefectHQ/fastmcp/pull/2550)

### [​](#enhancements--12) Enhancements 🔧

- Expose InitializeResult in middleware by [@jlowin](https://github.com/jlowin) in [#2562](https://github.com/PrefectHQ/fastmcp/pull/2562)
- Update MCP SDK auth compatibility by [@jlowin](https://github.com/jlowin) in [#2574](https://github.com/PrefectHQ/fastmcp/pull/2574)
- Validate tool names at registration (SEP-986) by [@jlowin](https://github.com/jlowin) in [#2588](https://github.com/PrefectHQ/fastmcp/pull/2588)
- Support SEP-1034 and SEP-1330 for elicitation by [@jlowin](https://github.com/jlowin) in [#2595](https://github.com/PrefectHQ/fastmcp/pull/2595)
- Implement SSE polling (SEP-1699) by [@jlowin](https://github.com/jlowin) in [#2612](https://github.com/PrefectHQ/fastmcp/pull/2612)
- Expose session ID callback by [@jlowin](https://github.com/jlowin) in [#2628](https://github.com/PrefectHQ/fastmcp/pull/2628)

### [​](#fixes--23) Fixes 🐞

- Fix OAuth metadata discovery by [@jlowin](https://github.com/jlowin) in [#2565](https://github.com/PrefectHQ/fastmcp/pull/2565)
- Fix fastapi.cli package structure by [@jlowin](https://github.com/jlowin) in [#2570](https://github.com/PrefectHQ/fastmcp/pull/2570)
- Correct OAuth error codes by [@jlowin](https://github.com/jlowin) in [#2578](https://github.com/PrefectHQ/fastmcp/pull/2578)
- Prevent function signature modification by [@jlowin](https://github.com/jlowin) in [#2590](https://github.com/PrefectHQ/fastmcp/pull/2590)
- Fix proxy client kwargs by [@jlowin](https://github.com/jlowin) in [#2605](https://github.com/PrefectHQ/fastmcp/pull/2605)
- Fix nested server routing by [@jlowin](https://github.com/jlowin) in [#2618](https://github.com/PrefectHQ/fastmcp/pull/2618)
- Use access token expiry fallback by [@jlowin](https://github.com/jlowin) in [#2635](https://github.com/PrefectHQ/fastmcp/pull/2635)
- Handle transport cleanup exceptions by [@jlowin](https://github.com/jlowin) in [#2642](https://github.com/PrefectHQ/fastmcp/pull/2642)

### [​](#docs--16) Docs 📚

- Add OCI and Supabase integration docs by [@jlowin](https://github.com/jlowin) in [#2580](https://github.com/PrefectHQ/fastmcp/pull/2580)
- Add v2.14.0 upgrade guide by [@jlowin](https://github.com/jlowin) in [#2598](https://github.com/PrefectHQ/fastmcp/pull/2598)
- Rewrite background tasks documentation by [@jlowin](https://github.com/jlowin) in [#2620](https://github.com/PrefectHQ/fastmcp/pull/2620)
- Document read-only tool patterns by [@jlowin](https://github.com/jlowin) in [#2632](https://github.com/PrefectHQ/fastmcp/pull/2632)

## [​](#new-contributors-12) New Contributors

11 total contributors including 7 first-time participants.**Full Changelog**: [v2.13.3…v2.14.0](https://github.com/PrefectHQ/fastmcp/compare/v2.13.3...v2.14.0)

[​](#v2-13-3)

v2.13.3

2025-12-03

**[v2.13.3: Pin-ish Line](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.13.3)**FastMCP 2.13.3 pins `mcp<1.23` as a precautionary measure. MCP SDK 1.23 introduced changes related to the November 25, 2025 MCP protocol update that break certain FastMCP patches and workarounds, particularly around OAuth implementation details. FastMCP 2.14 introduces proper support for the updated protocol and requires `mcp>=1.23`.

## [​](#what’s-changed-11) What’s Changed

### [​](#fixes--24) Fixes 🐞

- Pin MCP SDK below 1.23 by [@jlowin](https://github.com/jlowin) in [#2545](https://github.com/PrefectHQ/fastmcp/pull/2545)

**Full Changelog**: [v2.13.2…v2.13.3](https://github.com/PrefectHQ/fastmcp/compare/v2.13.2...v2.13.3)

[​](#v2-13-2)

v2.13.2

2025-12-01

**[v2.13.2: Refreshing Changes](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.13.2)**FastMCP 2.13.2 polishes the authentication stack with improvements to token refresh, scope handling, and multi-instance deployments. Discord was added as a built-in OAuth provider, Azure and Google token handling became more reliable, and proxy classes now properly forward icons and titles.

## [​](#what’s-changed-12) What’s Changed

### [​](#new-features--10) New Features 🎉

- Add Discord OAuth provider by [@jlowin](https://github.com/jlowin) in [#2480](https://github.com/PrefectHQ/fastmcp/pull/2480)

### [​](#enhancements--13) Enhancements 🔧

- Descope Provider updates for new well-known URLs by [@anvibanga](https://github.com/anvibanga) in [#2465](https://github.com/PrefectHQ/fastmcp/pull/2465)
- Scalekit provider improvements by [@jlowin](https://github.com/jlowin) in [#2472](https://github.com/PrefectHQ/fastmcp/pull/2472)
- Add CSP customization for consent screens by [@jlowin](https://github.com/jlowin) in [#2488](https://github.com/PrefectHQ/fastmcp/pull/2488)
- Add icon support to proxy classes by [@jlowin](https://github.com/jlowin) in [#2495](https://github.com/PrefectHQ/fastmcp/pull/2495)

### [​](#fixes--25) Fixes 🐞

- Google Provider now defaults to refresh token support by [@jlowin](https://github.com/jlowin) in [#2468](https://github.com/PrefectHQ/fastmcp/pull/2468)
- Fix Azure OAuth token refresh with unprefixed scopes by [@jlowin](https://github.com/jlowin) in [#2475](https://github.com/PrefectHQ/fastmcp/pull/2475)
- Prevent `$defs` mutation during tool transforms by [@jlowin](https://github.com/jlowin) in [#2482](https://github.com/PrefectHQ/fastmcp/pull/2482)
- Fix OAuth proxy refresh token storage for multi-instance deployments by [@jlowin](https://github.com/jlowin) in [#2490](https://github.com/PrefectHQ/fastmcp/pull/2490)
- Fix stale token issue after OAuth refresh by [@jlowin](https://github.com/jlowin) in [#2498](https://github.com/PrefectHQ/fastmcp/pull/2498)
- Fix Azure provider OIDC scope handling by [@jlowin](https://github.com/jlowin) in [#2505](https://github.com/PrefectHQ/fastmcp/pull/2505)

## [​](#new-contributors-13) New Contributors

7 new contributors made their first FastMCP contributions in this release.**Full Changelog**: [v2.13.1…v2.13.2](https://github.com/PrefectHQ/fastmcp/compare/v2.13.1...v2.13.2)

[​](#v2-13-1)

v2.13.1

2025-11-15

**[v2.13.1: Heavy Meta](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.13.1)**FastMCP 2.13.1 introduces meta parameter support for `ToolResult`, enabling tools to return supplementary metadata alongside results. This supports emerging use cases like OpenAI’s Apps SDK. The release also brings improved OAuth functionality with custom token verifiers including a new DebugTokenVerifier, and adds OCI and Supabase authentication providers.🏷️ **Meta parameters for ToolResult** enable tools to return supplementary metadata alongside results, supporting patterns like OpenAI’s Apps SDK integration.🔐 **Custom token verifiers** with DebugTokenVerifier for development, plus Azure Government support through a `base_authority` parameter and Supabase authentication algorithm configuration.🔒 **Security fixes** address CVE-2025-61920 through authlib updates and validate Cursor deeplink URLs using safer Windows APIs.

## [​](#what’s-changed-13) What’s Changed

### [​](#new-features--11) New Features 🎉

- Add meta parameter support for ToolResult by [@jlowin](https://github.com/jlowin) in [#2350](https://github.com/PrefectHQ/fastmcp/pull/2350)
- Add OCI authentication provider by [@jlowin](https://github.com/jlowin) in [#2365](https://github.com/PrefectHQ/fastmcp/pull/2365)
- Add Supabase authentication provider by [@jlowin](https://github.com/jlowin) in [#2378](https://github.com/PrefectHQ/fastmcp/pull/2378)

### [​](#enhancements--14) Enhancements 🔧

- Add custom token verifier support to OIDCProxy by [@jlowin](https://github.com/jlowin) in [#2355](https://github.com/PrefectHQ/fastmcp/pull/2355)
- Add DebugTokenVerifier for development by [@jlowin](https://github.com/jlowin) in [#2362](https://github.com/PrefectHQ/fastmcp/pull/2362)
- Add Azure Government support via base\_authority parameter by [@jlowin](https://github.com/jlowin) in [#2385](https://github.com/PrefectHQ/fastmcp/pull/2385)
- Add Supabase authentication algorithm configuration by [@jlowin](https://github.com/jlowin) in [#2392](https://github.com/PrefectHQ/fastmcp/pull/2392)

### [​](#fixes--26) Fixes 🐞

- Security: Update authlib for CVE-2025-61920 by [@jlowin](https://github.com/jlowin) in [#2398](https://github.com/PrefectHQ/fastmcp/pull/2398)
- Validate Cursor deeplink URLs using safer Windows APIs by [@jlowin](https://github.com/jlowin) in [#2405](https://github.com/PrefectHQ/fastmcp/pull/2405)
- Exclude MCP SDK 1.21.1 due to integration test failures by [@jlowin](https://github.com/jlowin) in [#2422](https://github.com/PrefectHQ/fastmcp/pull/2422)

## [​](#new-contributors-14) New Contributors

18 new contributors joined in this release across 70+ pull requests.**Full Changelog**: [v2.13.0…v2.13.1](https://github.com/PrefectHQ/fastmcp/compare/v2.13.0...v2.13.1)

[​](#v2-13-0)

v2.13.0

2025-10-25

**[v2.13.0: Cache Me If You Can](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.13.0)**FastMCP 2.13 “Cache Me If You Can” represents a fundamental maturation of the framework. After months of community feedback on authentication and state management, this release delivers the infrastructure FastMCP needs to handle production workloads: persistent storage, response caching, and pragmatic OAuth improvements that reflect real-world deployment challenges.💾 **Pluggable storage backends** bring persistent state to FastMCP servers. Built on [py-key-value-aio](https://github.com/strawgate/py-key-value), a new library from FastMCP maintainer Bill Easton ([@strawgate](https://github.com/strawgate)), the storage layer provides encrypted disk storage by default, platform-aware token management, and a simple key-value interface for application state. We’re excited to bring this elegantly designed library into the FastMCP ecosystem - it’s both powerful and remarkably easy to use, including wrappers to add encryption, TTLs, caching, and more to backends ranging from Elasticsearch, Redis, DynamoDB, filesystem, in-memory, and more! OAuth providers now automatically persist tokens across restarts, and developers can store arbitrary state without reaching for external databases. This foundation enables long-running sessions, cached credentials, and stateful applications built on MCP.🔐 **OAuth maturity** brings months of production learnings into the framework. The new consent screen prevents confused deputy and authorization bypass attacks discovered in earlier versions while providing a clean UX with customizable branding. The OAuth proxy now issues its own tokens with automatic key derivation from client secrets, and RFC 7662 token introspection support enables enterprise auth flows. Path prefix mounting enables OAuth-protected servers to integrate into existing web applications under custom paths like `/api`, and MCP 1.17+ compliance with RFC 9728 ensures protocol compatibility. Combined with improved error handling and platform-aware token storage, OAuth is now production-ready and security-hardened for serious applications.FastMCP now supports out-of-the-box authentication with:

- **[WorkOS](gofastmcp__com__integrations__workos.md)** and **[AuthKit](gofastmcp__com__integrations__authkit.md)**
- **[GitHub](gofastmcp__com__integrations__github.md)**
- **[Google](gofastmcp__com__integrations__google.md)**
- **[Azure](gofastmcp__com__integrations__azure.md)** (Entra ID)
- **[AWS Cognito](gofastmcp__com__integrations__aws-cognito.md)**
- **[Auth0](gofastmcp__com__integrations__auth0.md)**
- **[Descope](gofastmcp__com__integrations__descope.md)**
- **[Scalekit](gofastmcp__com__integrations__scalekit.md)**
- **[JWTs](gofastmcp__com__servers__auth__token-verification.md)**
- **[RFC 7662 token introspection](gofastmcp__com__servers__auth__token-verification.md)**

⚡ **Response Caching Middleware** dramatically improves performance for expensive operations. Cache tool and resource responses with configurable TTLs, reducing redundant API calls and speeding up repeated queries.🔄 **Server lifespans** provide proper initialization and cleanup hooks that run once per server instance instead of per client session. This fixes a long-standing source of confusion in the MCP SDK and enables proper resource management for database connections, background tasks, and other server-level state. Note: this is a breaking behavioral change if you were using the `lifespan` parameter.✨ **Developer experience improvements** include Pydantic input validation for better type safety, icon support for richer UX, RFC 6570 query parameters for resource templates, improved Context API methods (list\_resources, list\_prompts, get\_prompt), and async file/directory resources.This release includes contributions from **20** new contributors and represents the largest feature set in a while. Thank you to everyone who tested preview builds and filed issues - your feedback shaped these improvements!**Full Changelog**: [v2.12.5…v2.13.0](https://github.com/PrefectHQ/fastmcp/compare/v2.12.5...v2.13.0)

[​](#v2-12-5)

v2.12.5

2025-10-17

**[v2.12.5: Safety Pin](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.12.5)**FastMCP 2.12.5 is a point release that pins the MCP SDK version below 1.17, which introduced a change affecting FastMCP users with auth providers mounted as part of a larger application. This ensures the `.well-known` payload appears in the expected location when using FastMCP authentication providers with composite applications.

## [​](#what’s-changed-14) What’s Changed

### [​](#fixes--27) Fixes 🐞

- Pin MCP SDK version below 1.17 by [@jlowin](https://github.com/jlowin) in [a1b2c3d](https://github.com/PrefectHQ/fastmcp/commit/dab2b316ddc3883b7896a86da21cacb68da01e5c)

**Full Changelog**: [v2.12.4…v2.12.5](https://github.com/PrefectHQ/fastmcp/compare/v2.12.4...v2.12.5)

[​](#v2-12-4)

v2.12.4

2025-09-26

**[v2.12.4: OIDC What You Did There](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.12.4)**FastMCP 2.12.4 adds comprehensive OIDC support and expands authentication options with AWS Cognito and Descope providers. The release also includes improvements to logging middleware, URL handling for nested resources, persistent OAuth client registration storage, and various fixes to the experimental OpenAPI parser.

## [​](#what’s-changed-15) What’s Changed

### [​](#new-features--12) New Features 🎉

- feat: Add support for OIDC configuration by [@ruhulio](https://github.com/ruhulio) in [#1817](https://github.com/PrefectHQ/fastmcp/pull/1817)

### [​](#enhancements--15) Enhancements 🔧

- feat: Move the Starlette context middleware to the front by [@akkuman](https://github.com/akkuman) in [#1812](https://github.com/PrefectHQ/fastmcp/pull/1812)
- Refactor Logging and Structured Logging Middleware by [@strawgate](https://github.com/strawgate) in [#1805](https://github.com/PrefectHQ/fastmcp/pull/1805)
- Update pull\_request\_template.md by [@jlowin](https://github.com/jlowin) in [#1824](https://github.com/PrefectHQ/fastmcp/pull/1824)
- chore: Set redirect\_path default in function by [@ruhulio](https://github.com/ruhulio) in [#1833](https://github.com/PrefectHQ/fastmcp/pull/1833)
- feat: Set instructions in code by [@attiks](https://github.com/attiks) in [#1838](https://github.com/PrefectHQ/fastmcp/pull/1838)
- Automatically Create inline Snapshots by [@strawgate](https://github.com/strawgate) in [#1779](https://github.com/PrefectHQ/fastmcp/pull/1779)
- chore: Cleanup Auth0 redirect\_path initialization by [@ruhulio](https://github.com/ruhulio) in [#1842](https://github.com/PrefectHQ/fastmcp/pull/1842)
- feat: Add support for Descope Authentication by [@anvibanga](https://github.com/anvibanga) in [#1853](https://github.com/PrefectHQ/fastmcp/pull/1853)
- Update descope version badges by [@jlowin](https://github.com/jlowin) in [#1870](https://github.com/PrefectHQ/fastmcp/pull/1870)
- Update welcome images by [@jlowin](https://github.com/jlowin) in [#1884](https://github.com/PrefectHQ/fastmcp/pull/1884)
- Fix rounded edges of image by [@jlowin](https://github.com/jlowin) in [#1886](https://github.com/PrefectHQ/fastmcp/pull/1886)
- optimize test suite by [@zzstoatzz](https://github.com/zzstoatzz) in [#1893](https://github.com/PrefectHQ/fastmcp/pull/1893)
- Enhancement: client completions support context\_arguments by [@isijoe](https://github.com/isijoe) in [#1906](https://github.com/PrefectHQ/fastmcp/pull/1906)
- Update Descope icon by [@anvibanga](https://github.com/anvibanga) in [#1912](https://github.com/PrefectHQ/fastmcp/pull/1912)
- Add AWS Cognito OAuth Provider for Enterprise Authentication by [@stephaneberle9](https://github.com/stephaneberle9) in [#1873](https://github.com/PrefectHQ/fastmcp/pull/1873)
- Fix typos discovered by codespell by [@cclauss](https://github.com/cclauss) in [#1922](https://github.com/PrefectHQ/fastmcp/pull/1922)
- Use lowercase namespace for fastmcp logger by [@jlowin](https://github.com/jlowin) in [#1791](https://github.com/PrefectHQ/fastmcp/pull/1791)

### [​](#fixes--28) Fixes 🐞

- Update quickstart.mdx by [@radi-dev](https://github.com/radi-dev) in [#1821](https://github.com/PrefectHQ/fastmcp/pull/1821)
- Remove extraneous union import by [@jlowin](https://github.com/jlowin) in [#1823](https://github.com/PrefectHQ/fastmcp/pull/1823)
- Delay import of Provider classes until FastMCP Server Creation by [@strawgate](https://github.com/strawgate) in [#1820](https://github.com/PrefectHQ/fastmcp/pull/1820)
- fix: correct documentation link in deprecation warning by [@strawgate](https://github.com/strawgate) in [#1828](https://github.com/PrefectHQ/fastmcp/pull/1828)
- fix: Increase default 3s timeout on Pytest by [@dacamposol](https://github.com/dacamposol) in [#1866](https://github.com/PrefectHQ/fastmcp/pull/1866)
- fix: Improve URL handling in OIDCConfiguration by [@ruhulio](https://github.com/ruhulio) in [#1850](https://github.com/PrefectHQ/fastmcp/pull/1850)
- fix: correct typing for on\_read\_resource middleware method by [@strawgate](https://github.com/strawgate) in [#1858](https://github.com/PrefectHQ/fastmcp/pull/1858)
- feat(experimental/openapi): replace $ref in additionalProperties; add tests by [@jlowin](https://github.com/jlowin) in [#1735](https://github.com/PrefectHQ/fastmcp/pull/1735)
- Honor client supplied scopes during registration by [@dmikusa](https://github.com/dmikusa) in [#1860](https://github.com/PrefectHQ/fastmcp/pull/1860)
- Fix: FastAPI list parameter parsing in experimental OpenAPI parser by [@jlowin](https://github.com/jlowin) in [#1834](https://github.com/PrefectHQ/fastmcp/pull/1834)
- Add log level support for stdio and HTTP transports by [@jlowin](https://github.com/jlowin) in [#1840](https://github.com/PrefectHQ/fastmcp/pull/1840)
- Fix OAuth pre-flight check to accept HTTP 200 responses by [@jlowin](https://github.com/jlowin) in [#1874](https://github.com/PrefectHQ/fastmcp/pull/1874)
- Fix: Preserve OpenAPI parameter descriptions in experimental parser by [@shlomo666](https://github.com/shlomo666) in [#1877](https://github.com/PrefectHQ/fastmcp/pull/1877)
- Add persistent storage for OAuth client registrations by [@jlowin](https://github.com/jlowin) in [#1879](https://github.com/PrefectHQ/fastmcp/pull/1879)
- docs: update release dates based on github releases by [@lodu](https://github.com/lodu) in [#1890](https://github.com/PrefectHQ/fastmcp/pull/1890)
- Small updates to Sampling types by [@strawgate](https://github.com/strawgate) in [#1882](https://github.com/PrefectHQ/fastmcp/pull/1882)
- remove lockfile smart\_home example by [@zzstoatzz](https://github.com/zzstoatzz) in [#1892](https://github.com/PrefectHQ/fastmcp/pull/1892)
- Fix: Remove JSON schema title metadata while preserving parameters named ‘title’ by [@jlowin](https://github.com/jlowin) in [#1872](https://github.com/PrefectHQ/fastmcp/pull/1872)
- Fix: get\_resource\_url nested URL handling by [@raphael-linx](https://github.com/raphael-linx) in [#1914](https://github.com/PrefectHQ/fastmcp/pull/1914)
- Clean up code for creating the resource url by [@jlowin](https://github.com/jlowin) in [#1916](https://github.com/PrefectHQ/fastmcp/pull/1916)
- Fix route count logging in OpenAPI server by [@zzstoatzz](https://github.com/zzstoatzz) in [#1928](https://github.com/PrefectHQ/fastmcp/pull/1928)

### [​](#docs--17) Docs 📚

- docs: make Gemini CLI integration discoverable by [@jackwotherspoon](https://github.com/jackwotherspoon) in [#1827](https://github.com/PrefectHQ/fastmcp/pull/1827)
- docs: update NEW tags for AI assistant integrations by [@jackwotherspoon](https://github.com/jackwotherspoon) in [#1829](https://github.com/PrefectHQ/fastmcp/pull/1829)
- Update wordmark by [@jlowin](https://github.com/jlowin) in [#1832](https://github.com/PrefectHQ/fastmcp/pull/1832)
- docs: improve OAuth and OIDC Proxy documentation by [@jlowin](https://github.com/jlowin) in [#1880](https://github.com/PrefectHQ/fastmcp/pull/1880)
- Update readme + welcome docs by [@jlowin](https://github.com/jlowin) in [#1883](https://github.com/PrefectHQ/fastmcp/pull/1883)
- Update dark mode image in README by [@jlowin](https://github.com/jlowin) in [#1885](https://github.com/PrefectHQ/fastmcp/pull/1885)

## [​](#new-contributors-15) New Contributors

- [@radi-dev](https://github.com/radi-dev) made their first contribution in [#1821](https://github.com/PrefectHQ/fastmcp/pull/1821)
- [@akkuman](https://github.com/akkuman) made their first contribution in [#1812](https://github.com/PrefectHQ/fastmcp/pull/1812)
- [@ruhulio](https://github.com/ruhulio) made their first contribution in [#1817](https://github.com/PrefectHQ/fastmcp/pull/1817)
- [@attiks](https://github.com/attiks) made their first contribution in [#1838](https://github.com/PrefectHQ/fastmcp/pull/1838)
- [@anvibanga](https://github.com/anvibanga) made their first contribution in [#1853](https://github.com/PrefectHQ/fastmcp/pull/1853)
- [@shlomo666](https://github.com/shlomo666) made their first contribution in [#1877](https://github.com/PrefectHQ/fastmcp/pull/1877)
- [@lodu](https://github.com/lodu) made their first contribution in [#1890](https://github.com/PrefectHQ/fastmcp/pull/1890)
- [@isijoe](https://github.com/isijoe) made their first contribution in [#1906](https://github.com/PrefectHQ/fastmcp/pull/1906)
- [@raphael-linx](https://github.com/raphael-linx) made their first contribution in [#1914](https://github.com/PrefectHQ/fastmcp/pull/1914)
- [@stephaneberle9](https://github.com/stephaneberle9) made their first contribution in [#1873](https://github.com/PrefectHQ/fastmcp/pull/1873)
- [@cclauss](https://github.com/cclauss) made their first contribution in [#1922](https://github.com/PrefectHQ/fastmcp/pull/1922)

**Full Changelog**: [v2.12.3…v2.12.4](https://github.com/PrefectHQ/fastmcp/compare/v2.12.3...v2.12.4)

[​](#v2-12-3)

v2.12.3

2025-09-17

**[v2.12.3: Double Time](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.12.3)**FastMCP 2.12.3 focuses on performance and developer experience improvements based on community feedback. This release includes optimized auth provider imports that reduce server startup time, enhanced OIDC authentication flows with proper token management, and several reliability fixes for OAuth proxy configurations. The addition of automatic inline snapshot creation significantly improves the testing experience for contributors.

## [​](#what’s-changed-16) What’s Changed

### [​](#new-features--13) New Features 🎉

- feat: Support setting MCP log level via transport configuration by [@jlowin](https://github.com/jlowin) in [#1756](https://github.com/PrefectHQ/fastmcp/pull/1756)

### [​](#enhancements--16) Enhancements 🔧

- Add client-side auth support for mcp install cursor command by [@jlowin](https://github.com/jlowin) in [#1747](https://github.com/PrefectHQ/fastmcp/pull/1747)
- Automatically Create inline Snapshots by [@strawgate](https://github.com/strawgate) in [#1779](https://github.com/PrefectHQ/fastmcp/pull/1779)
- Use lowercase namespace for fastmcp logger by [@jlowin](https://github.com/jlowin) in [#1791](https://github.com/PrefectHQ/fastmcp/pull/1791)

### [​](#fixes--29) Fixes 🐞

- fix: correct merge mistake during auth0 refactor by [@strawgate](https://github.com/strawgate) in [#1742](https://github.com/PrefectHQ/fastmcp/pull/1742)
- Remove extraneous union import by [@jlowin](https://github.com/jlowin) in [#1823](https://github.com/PrefectHQ/fastmcp/pull/1823)
- Delay import of Provider classes until FastMCP Server Creation by [@strawgate](https://github.com/strawgate) in [#1820](https://github.com/PrefectHQ/fastmcp/pull/1820)
- fix: refactor OIDC configuration provider for proper token management by [@strawgate](https://github.com/strawgate) in [#1751](https://github.com/PrefectHQ/fastmcp/pull/1751)
- Fix smart\_home example imports by [@strawgate](https://github.com/strawgate) in [#1753](https://github.com/PrefectHQ/fastmcp/pull/1753)
- fix: correct oauth proxy initialization of client by [@strawgate](https://github.com/strawgate) in [#1759](https://github.com/PrefectHQ/fastmcp/pull/1759)
- Fix: return empty string when prompts have no arguments by [@jlowin](https://github.com/jlowin) in [#1766](https://github.com/PrefectHQ/fastmcp/pull/1766)
- Fix async server callbacks by [@strawgate](https://github.com/strawgate) in [#1774](https://github.com/PrefectHQ/fastmcp/pull/1774)
- Fix error when retrieving Completion API errors by [@strawgate](https://github.com/strawgate) in [#1785](https://github.com/PrefectHQ/fastmcp/pull/1785)
- fix: correct documentation link in deprecation warning by [@strawgate](https://github.com/strawgate) in [#1828](https://github.com/PrefectHQ/fastmcp/pull/1828)

### [​](#docs--18) Docs 📚

- Add migration docs for 2.12 by [@jlowin](https://github.com/jlowin) in [#1745](https://github.com/PrefectHQ/fastmcp/pull/1745)
- Update docs for default sampling implementation to mention OpenAI API Key by [@strawgate](https://github.com/strawgate) in [#1763](https://github.com/PrefectHQ/fastmcp/pull/1763)
- Add tip about sampling prompts and user\_context to sampling documentation by [@jlowin](https://github.com/jlowin) in [#1764](https://github.com/PrefectHQ/fastmcp/pull/1764)
- Update quickstart.mdx by [@radi-dev](https://github.com/radi-dev) in [#1821](https://github.com/PrefectHQ/fastmcp/pull/1821)

### [​](#other-changes--7) Other Changes 🦾

- Replace Marvin with Claude Code in CI by [@jlowin](https://github.com/jlowin) in [#1800](https://github.com/PrefectHQ/fastmcp/pull/1800)
- Refactor logging and structured logging middleware by [@strawgate](https://github.com/strawgate) in [#1805](https://github.com/PrefectHQ/fastmcp/pull/1805)
- feat: Move the Starlette context middleware to the front by [@akkuman](https://github.com/akkuman) in [#1812](https://github.com/PrefectHQ/fastmcp/pull/1812)
- feat: Add support for OIDC configuration by [@ruhulio](https://github.com/ruhulio) in [#1817](https://github.com/PrefectHQ/fastmcp/pull/1817)

## [​](#new-contributors-16) New Contributors

- [@radi-dev](https://github.com/radi-dev) made their first contribution in [#1821](https://github.com/PrefectHQ/fastmcp/pull/1821)
- [@akkuman](https://github.com/akkuman) made their first contribution in [#1812](https://github.com/PrefectHQ/fastmcp/pull/1812)
- [@ruhulio](https://github.com/ruhulio) made their first contribution in [#1817](https://github.com/PrefectHQ/fastmcp/pull/1817)

**Full Changelog**: [v2.12.2…v2.12.3](https://github.com/PrefectHQ/fastmcp/compare/v2.12.2...v2.12.3)

[​](#v2-12-2)

v2.12.2

2025-09-03

**[v2.12.2: Perchance to Stream](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.12.2)**This is a hotfix for a bug where the `streamable-http` transport was not recognized as a valid option in `fastmcp.json` configuration files, despite being supported by the CLI. This resulted in a parsing error when the CLI arguments were merged against the configuration spec.

## [​](#what’s-changed-17) What’s Changed

### [​](#fixes--30) Fixes 🐞

- Fix streamable-http transport validation in fastmcp.json config by [@jlowin](https://github.com/jlowin) in [#1739](https://github.com/PrefectHQ/fastmcp/pull/1739)

**Full Changelog**: [v2.12.1…v2.12.2](https://github.com/PrefectHQ/fastmcp/compare/v2.12.1...v2.12.2)

[​](#v2-12-1)

v2.12.1

2025-09-03

**[v2.12.1: OAuth to Joy](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.12.1)**FastMCP 2.12.1 strengthens the OAuth proxy implementation based on extensive community testing and feedback. This release improves client storage reliability, adds PKCE forwarding for enhanced security, introduces configurable token endpoint authentication methods, and expands scope handling—all addressing real-world integration challenges discovered since 2.12.0. The enhanced test suite with mock providers ensures these improvements are robust and maintainable.

## [​](#breaking-changes-2) Breaking Changes

- **OAuth Proxy**: Users of built-in IDP integrations should note that `resource_server_url` has been renamed to `base_url` for clarity and consistency

## [​](#what’s-changed-18) What’s Changed

### [​](#enhancements--17) Enhancements 🔧

- Make openai dependency optional by [@jlowin](https://github.com/jlowin) in [#1701](https://github.com/PrefectHQ/fastmcp/pull/1701)
- Remove orphaned OAuth proxy code by [@jlowin](https://github.com/jlowin) in [#1722](https://github.com/PrefectHQ/fastmcp/pull/1722)
- Expose valid scopes from OAuthProxy metadata by [@dmikusa](https://github.com/dmikusa) in [#1717](https://github.com/PrefectHQ/fastmcp/pull/1717)
- OAuth proxy PKCE forwarding by [@jlowin](https://github.com/jlowin) in [#1733](https://github.com/PrefectHQ/fastmcp/pull/1733)
- Add token\_endpoint\_auth\_method parameter to OAuthProxy by [@jlowin](https://github.com/jlowin) in [#1736](https://github.com/PrefectHQ/fastmcp/pull/1736)
- Clean up and enhance OAuth proxy tests with mock provider by [@jlowin](https://github.com/jlowin) in [#1738](https://github.com/PrefectHQ/fastmcp/pull/1738)

### [​](#fixes--31) Fixes 🐞

- refactor: replace auth provider registry with ImportString by [@jlowin](https://github.com/jlowin) in [#1710](https://github.com/PrefectHQ/fastmcp/pull/1710)
- Fix OAuth resource URL handling and WWW-Authenticate header by [@jlowin](https://github.com/jlowin) in [#1706](https://github.com/PrefectHQ/fastmcp/pull/1706)
- Fix OAuth proxy client storage and add retry logic by [@jlowin](https://github.com/jlowin) in [#1732](https://github.com/PrefectHQ/fastmcp/pull/1732)

### [​](#docs--19) Docs 📚

- Fix documentation: use StreamableHttpTransport for headers in testing by [@jlowin](https://github.com/jlowin) in [#1702](https://github.com/PrefectHQ/fastmcp/pull/1702)
- docs: add performance warnings for mounted servers and proxies by [@strawgate](https://github.com/strawgate) in [#1669](https://github.com/PrefectHQ/fastmcp/pull/1669)
- Update documentation around scopes for google by [@jlowin](https://github.com/jlowin) in [#1703](https://github.com/PrefectHQ/fastmcp/pull/1703)
- Add deployment information to quickstart by [@seanpwlms](https://github.com/seanpwlms) in [#1433](https://github.com/PrefectHQ/fastmcp/pull/1433)
- Update quickstart by [@jlowin](https://github.com/jlowin) in [#1728](https://github.com/PrefectHQ/fastmcp/pull/1728)
- Add development docs for FastMCP by [@jlowin](https://github.com/jlowin) in [#1719](https://github.com/PrefectHQ/fastmcp/pull/1719)

### [​](#other-changes--8) Other Changes 🦾

- Set generics without bounds to default=Any by [@strawgate](https://github.com/strawgate) in [#1648](https://github.com/PrefectHQ/fastmcp/pull/1648)

## [​](#new-contributors-17) New Contributors

- [@dmikusa](https://github.com/dmikusa) made their first contribution in [#1717](https://github.com/PrefectHQ/fastmcp/pull/1717)
- [@seanpwlms](https://github.com/seanpwlms) made their first contribution in [#1433](https://github.com/PrefectHQ/fastmcp/pull/1433)

**Full Changelog**: [v2.12.0…v2.12.1](https://github.com/PrefectHQ/fastmcp/compare/v2.12.0...v2.12.1)

[​](#v2-12-0)

v2.12.0

2025-08-31

**[v2.12.0: Auth to the Races](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.12.0)**FastMCP 2.12 represents one of our most significant releases to date, both in scope and community involvement. After extensive testing and iteration with the community, we’re shipping major improvements to authentication, configuration, and MCP feature adoption.🔐 **OAuth Proxy for Broader Provider Support** addresses a fundamental challenge: while MCP requires Dynamic Client Registration (DCR), many popular OAuth providers don’t support it. The new OAuth proxy bridges this gap, enabling FastMCP servers to authenticate with providers like GitHub, Google, WorkOS, and Azure through minimal configuration. These native integrations ship today, with more providers planned based on community needs.📋 **Declarative JSON Configuration** introduces a standardized, portable way to describe and deploy MCP servers. The `fastmcp.json` configuration file becomes the single source of truth for dependencies, transport settings, entrypoints, and server metadata. This foundation sets the stage for future capabilities like transformations and remote sources, moving toward a world where MCP servers are as portable and shareable as container images.🧠 **Sampling API Fallback** tackles the chicken-and-egg problem limiting adoption of advanced MCP features. Sampling—where servers request LLM completions from clients—is powerful but underutilized due to limited client support. FastMCP now lets server authors define fallback handlers that generate sampling completions server-side when clients don’t support the feature, encouraging adoption while maintaining compatibility.This release took longer than usual to ship, and for good reason: the community’s aggressive testing and feedback on the authentication system helped us reach a level of stability we’re confident in. There’s certainly more work ahead, but these foundations position FastMCP to handle increasingly complex use cases while remaining approachable for developers.Thank you to our new contributors and everyone who tested preview builds. Your feedback directly shaped these features.

## [​](#what’s-changed-19) What’s Changed

### [​](#new-features--14) New Features 🎉

- Add OAuth proxy that allows authentication with social IDPs without DCR support by [@jlowin](https://github.com/jlowin) in [#1434](https://github.com/PrefectHQ/fastmcp/pull/1434)
- feat: introduce declarative JSON configuration system by [@jlowin](https://github.com/jlowin) in [#1517](https://github.com/PrefectHQ/fastmcp/pull/1517)
- ✨ Fallback to a Completions API when Sampling is not available by [@strawgate](https://github.com/strawgate) in [#1145](https://github.com/PrefectHQ/fastmcp/pull/1145)
- Implement typed source system for FastMCP declarative configuration by [@jlowin](https://github.com/jlowin) in [#1607](https://github.com/PrefectHQ/fastmcp/pull/1607)

### [​](#enhancements--18) Enhancements 🔧

- Support importing custom\_route endpoints when mounting servers by [@jlowin](https://github.com/jlowin) in [#1470](https://github.com/PrefectHQ/fastmcp/pull/1470)
- Remove unnecessary asserts by [@jlowin](https://github.com/jlowin) in [#1484](https://github.com/PrefectHQ/fastmcp/pull/1484)
- Add Claude issue triage by [@jlowin](https://github.com/jlowin) in [#1510](https://github.com/PrefectHQ/fastmcp/pull/1510)
- Inline dedupe prompt by [@jlowin](https://github.com/jlowin) in [#1512](https://github.com/PrefectHQ/fastmcp/pull/1512)
- Improve stdio and mcp\_config clean-up by [@strawgate](https://github.com/strawgate) in [#1444](https://github.com/PrefectHQ/fastmcp/pull/1444)
- involve kwargs to pass parameters on creating RichHandler for logging customization. by [@itaru2622](https://github.com/itaru2622) in [#1504](https://github.com/PrefectHQ/fastmcp/pull/1504)
- Move SDK docs generation to post-merge workflow by [@jlowin](https://github.com/jlowin) in [#1513](https://github.com/PrefectHQ/fastmcp/pull/1513)
- Improve label triage guidance by [@jlowin](https://github.com/jlowin) in [#1516](https://github.com/PrefectHQ/fastmcp/pull/1516)
- Add code review guidelines for agents by [@jlowin](https://github.com/jlowin) in [#1520](https://github.com/PrefectHQ/fastmcp/pull/1520)
- Remove trailing slash in unit tests by [@jlowin](https://github.com/jlowin) in [#1535](https://github.com/PrefectHQ/fastmcp/pull/1535)
- Update OAuth callback UI branding by [@jlowin](https://github.com/jlowin) in [#1536](https://github.com/PrefectHQ/fastmcp/pull/1536)
- Fix Marvin workflow to support development tools by [@jlowin](https://github.com/jlowin) in [#1537](https://github.com/PrefectHQ/fastmcp/pull/1537)
- Add mounted\_components\_raise\_on\_load\_error setting for debugging by [@jlowin](https://github.com/jlowin) in [#1534](https://github.com/PrefectHQ/fastmcp/pull/1534)
- feat: Add —workspace flag to fastmcp install cursor by [@jlowin](https://github.com/jlowin) in [#1522](https://github.com/PrefectHQ/fastmcp/pull/1522)
- switch from `pyright` to `ty` by [@zzstoatzz](https://github.com/zzstoatzz) in [#1545](https://github.com/PrefectHQ/fastmcp/pull/1545)
- feat: trigger Marvin workflow on PR body content by [@jlowin](https://github.com/jlowin) in [#1549](https://github.com/PrefectHQ/fastmcp/pull/1549)
- Add WorkOS and Azure OAuth providers by [@jlowin](https://github.com/jlowin) in [#1550](https://github.com/PrefectHQ/fastmcp/pull/1550)
- Adjust timeout for slow MCP Server shutdown test by [@strawgate](https://github.com/strawgate) in [#1561](https://github.com/PrefectHQ/fastmcp/pull/1561)
- Update banner by [@jlowin](https://github.com/jlowin) in [#1567](https://github.com/PrefectHQ/fastmcp/pull/1567)
- Added import of AuthProxy to auth **init** by [@KaliszS](https://github.com/KaliszS) in [#1568](https://github.com/PrefectHQ/fastmcp/pull/1568)
- Add configurable redirect URI validation for OAuth providers by [@jlowin](https://github.com/jlowin) in [#1582](https://github.com/PrefectHQ/fastmcp/pull/1582)
- Remove invalid-argument-type ignore and fix type errors by [@jlowin](https://github.com/jlowin) in [#1588](https://github.com/PrefectHQ/fastmcp/pull/1588)
- Remove generate-schema from public CLI by [@jlowin](https://github.com/jlowin) in [#1591](https://github.com/PrefectHQ/fastmcp/pull/1591)
- Skip flaky windows test / mulit-client garbage collection by [@jlowin](https://github.com/jlowin) in [#1592](https://github.com/PrefectHQ/fastmcp/pull/1592)
- Add setting to disable logging configuration by [@isra17](https://github.com/isra17) in [#1575](https://github.com/PrefectHQ/fastmcp/pull/1575)
- Improve debug logging for nested Servers / Clients by [@strawgate](https://github.com/strawgate) in [#1604](https://github.com/PrefectHQ/fastmcp/pull/1604)
- Add GitHub pull request template by [@strawgate](https://github.com/strawgate) in [#1581](https://github.com/PrefectHQ/fastmcp/pull/1581)
- chore: Automate docs and schema updates via PRs by [@jlowin](https://github.com/jlowin) in [#1611](https://github.com/PrefectHQ/fastmcp/pull/1611)
- Experiment with haiku for limited workflows by [@jlowin](https://github.com/jlowin) in [#1613](https://github.com/PrefectHQ/fastmcp/pull/1613)
- feat: Improve GitHub workflow automation for schema and SDK docs by [@jlowin](https://github.com/jlowin) in [#1615](https://github.com/PrefectHQ/fastmcp/pull/1615)
- Consolidate server loading logic into FileSystemSource by [@jlowin](https://github.com/jlowin) in [#1614](https://github.com/PrefectHQ/fastmcp/pull/1614)
- Prevent Haiku Marvin from commenting when there are no duplicates by [@jlowin](https://github.com/jlowin) in [#1622](https://github.com/PrefectHQ/fastmcp/pull/1622)
- chore: Add clarifying note to automated PR bodies by [@jlowin](https://github.com/jlowin) in [#1623](https://github.com/PrefectHQ/fastmcp/pull/1623)
- feat: introduce inline snapshots by [@strawgate](https://github.com/strawgate) in [#1605](https://github.com/PrefectHQ/fastmcp/pull/1605)
- Improve fastmcp.json environment configuration and project-based deployments by [@jlowin](https://github.com/jlowin) in [#1631](https://github.com/PrefectHQ/fastmcp/pull/1631)
- fix: allow passing query params in OAuthProxy upstream authorization url by [@danb27](https://github.com/danb27) in [#1630](https://github.com/PrefectHQ/fastmcp/pull/1630)
- Support multiple —with-editable flags in CLI commands by [@jlowin](https://github.com/jlowin) in [#1634](https://github.com/PrefectHQ/fastmcp/pull/1634)
- feat: support comma separated oauth scopes by [@jlowin](https://github.com/jlowin) in [#1642](https://github.com/PrefectHQ/fastmcp/pull/1642)
- Add allowed\_client\_redirect\_uris to OAuth provider subclasses by [@jlowin](https://github.com/jlowin) in [#1662](https://github.com/PrefectHQ/fastmcp/pull/1662)
- Consolidate CLI config parsing and prevent infinite loops by [@jlowin](https://github.com/jlowin) in [#1660](https://github.com/PrefectHQ/fastmcp/pull/1660)
- Internal refactor: mcp server config by [@jlowin](https://github.com/jlowin) in [#1672](https://github.com/PrefectHQ/fastmcp/pull/1672)
- Refactor Environment to support multiple runtime types by [@jlowin](https://github.com/jlowin) in [#1673](https://github.com/PrefectHQ/fastmcp/pull/1673)
- Add type field to Environment base class by [@jlowin](https://github.com/jlowin) in [#1676](https://github.com/PrefectHQ/fastmcp/pull/1676)

### [​](#fixes--32) Fixes 🐞

- Fix breaking change: restore output\_schema=False compatibility by [@jlowin](https://github.com/jlowin) in [#1482](https://github.com/PrefectHQ/fastmcp/pull/1482)
- Fix #1506: Update tool filtering documentation from \_meta to meta by [@maybenotconnor](https://github.com/maybenotconnor) in [#1511](https://github.com/PrefectHQ/fastmcp/pull/1511)
- Fix pytest warnings by [@jlowin](https://github.com/jlowin) in [#1559](https://github.com/PrefectHQ/fastmcp/pull/1559)
- nest schemas under assets by [@jlowin](https://github.com/jlowin) in [#1593](https://github.com/PrefectHQ/fastmcp/pull/1593)
- Skip flaky windows test by [@jlowin](https://github.com/jlowin) in [#1596](https://github.com/PrefectHQ/fastmcp/pull/1596)
- ACTUALLY move schemas to fastmcp.json by [@jlowin](https://github.com/jlowin) in [#1597](https://github.com/PrefectHQ/fastmcp/pull/1597)
- Fix and centralize CLI path resolution by [@jlowin](https://github.com/jlowin) in [#1590](https://github.com/PrefectHQ/fastmcp/pull/1590)
- Remove client info modifications by [@jlowin](https://github.com/jlowin) in [#1620](https://github.com/PrefectHQ/fastmcp/pull/1620)
- Fix $defs being discarded in input schema of transformed tool by [@pldesch-chift](https://github.com/pldesch-chift) in [#1578](https://github.com/PrefectHQ/fastmcp/pull/1578)
- Fix enum elicitation to use inline schemas for MCP compatibility by [@jlowin](https://github.com/jlowin) in [#1632](https://github.com/PrefectHQ/fastmcp/pull/1632)
- Reuse session for `StdioTransport` in `Client.new` by [@strawgate](https://github.com/strawgate) in [#1635](https://github.com/PrefectHQ/fastmcp/pull/1635)
- Feat: Configurable LoggingMiddleware payload serialization by [@vl-kp](https://github.com/vl-kp) in [#1636](https://github.com/PrefectHQ/fastmcp/pull/1636)
- Fix OAuth redirect URI validation for DCR compatibility by [@jlowin](https://github.com/jlowin) in [#1661](https://github.com/PrefectHQ/fastmcp/pull/1661)
- Add default scope handling in OAuth proxy by [@romanusyk](https://github.com/romanusyk) in [#1667](https://github.com/PrefectHQ/fastmcp/pull/1667)
- Fix OAuth token expiry handling by [@jlowin](https://github.com/jlowin) in [#1671](https://github.com/PrefectHQ/fastmcp/pull/1671)
- Add resource\_server\_url parameter to OAuth proxy providers by [@jlowin](https://github.com/jlowin) in [#1682](https://github.com/PrefectHQ/fastmcp/pull/1682)

### [​](#breaking-changes--4) Breaking Changes 🛫

- Enhance inspect command with structured output and format options by [@jlowin](https://github.com/jlowin) in [#1481](https://github.com/PrefectHQ/fastmcp/pull/1481)

### [​](#docs--20) Docs 📚

- Update changelog by [@jlowin](https://github.com/jlowin) in [#1453](https://github.com/PrefectHQ/fastmcp/pull/1453)
- Update banner by [@jlowin](https://github.com/jlowin) in [#1472](https://github.com/PrefectHQ/fastmcp/pull/1472)
- Update logo files by [@jlowin](https://github.com/jlowin) in [#1473](https://github.com/PrefectHQ/fastmcp/pull/1473)
- Update deployment docs by [@jlowin](https://github.com/jlowin) in [#1486](https://github.com/PrefectHQ/fastmcp/pull/1486)
- Update FastMCP Cloud screenshot by [@jlowin](https://github.com/jlowin) in [#1487](https://github.com/PrefectHQ/fastmcp/pull/1487)
- Update authentication note in docs by [@jlowin](https://github.com/jlowin) in [#1488](https://github.com/PrefectHQ/fastmcp/pull/1488)
- chore: Update installation.mdx version snippet by [@thomas-te](https://github.com/thomas-te) in [#1496](https://github.com/PrefectHQ/fastmcp/pull/1496)
- Update fastmcp cloud server requirements by [@jlowin](https://github.com/jlowin) in [#1497](https://github.com/PrefectHQ/fastmcp/pull/1497)
- Fix oauth pyright type checking by [@strawgate](https://github.com/strawgate) in [#1498](https://github.com/PrefectHQ/fastmcp/pull/1498)
- docs: Fix type annotation in return value documentation by [@MaikelVeen](https://github.com/MaikelVeen) in [#1499](https://github.com/PrefectHQ/fastmcp/pull/1499)
- Fix PromptMessage usage in docs example by [@jlowin](https://github.com/jlowin) in [#1515](https://github.com/PrefectHQ/fastmcp/pull/1515)
- Create CODE\_OF\_CONDUCT.md by [@jlowin](https://github.com/jlowin) in [#1523](https://github.com/PrefectHQ/fastmcp/pull/1523)
- Fixed wrong import path in new docs page by [@KaliszS](https://github.com/KaliszS) in [#1538](https://github.com/PrefectHQ/fastmcp/pull/1538)
- Document symmetric key JWT verification support by [@jlowin](https://github.com/jlowin) in [#1586](https://github.com/PrefectHQ/fastmcp/pull/1586)
- Update fastmcp.json schema path by [@jlowin](https://github.com/jlowin) in [#1595](https://github.com/PrefectHQ/fastmcp/pull/1595)

### [​](#dependencies--10) Dependencies 📦

- Bump actions/create-github-app-token from 1 to 2 by [@dependabot](https://github.com/dependabot)[bot] in [#1436](https://github.com/PrefectHQ/fastmcp/pull/1436)
- Bump astral-sh/setup-uv from 4 to 6 by [@dependabot](https://github.com/dependabot)[bot] in [#1532](https://github.com/PrefectHQ/fastmcp/pull/1532)
- Bump actions/checkout from 4 to 5 by [@dependabot](https://github.com/dependabot)[bot] in [#1533](https://github.com/PrefectHQ/fastmcp/pull/1533)

### [​](#other-changes--9) Other Changes 🦾

- Add dedupe workflow by [@jlowin](https://github.com/jlowin) in [#1454](https://github.com/PrefectHQ/fastmcp/pull/1454)
- Update AGENTS.md by [@jlowin](https://github.com/jlowin) in [#1471](https://github.com/PrefectHQ/fastmcp/pull/1471)
- Give Marvin the power of the Internet by [@strawgate](https://github.com/strawgate) in [#1475](https://github.com/PrefectHQ/fastmcp/pull/1475)
- Update `just` error message for static checks by [@jlowin](https://github.com/jlowin) in [#1483](https://github.com/PrefectHQ/fastmcp/pull/1483)
- Remove labeler by [@jlowin](https://github.com/jlowin) in [#1509](https://github.com/PrefectHQ/fastmcp/pull/1509)
- update aproto server to handle rich links by [@zzstoatzz](https://github.com/zzstoatzz) in [#1556](https://github.com/PrefectHQ/fastmcp/pull/1556)
- fix: enable triage bot for fork PRs using pull\_request\_target by [@jlowin](https://github.com/jlowin) in [#1557](https://github.com/PrefectHQ/fastmcp/pull/1557)

## [​](#new-contributors-18) New Contributors

- [@thomas-te](https://github.com/thomas-te) made their first contribution in [#1496](https://github.com/PrefectHQ/fastmcp/pull/1496)
- [@maybenotconnor](https://github.com/maybenotconnor) made their first contribution in [#1511](https://github.com/PrefectHQ/fastmcp/pull/1511)
- [@MaikelVeen](https://github.com/MaikelVeen) made their first contribution in [#1499](https://github.com/PrefectHQ/fastmcp/pull/1499)
- [@KaliszS](https://github.com/KaliszS) made their first contribution in [#1538](https://github.com/PrefectHQ/fastmcp/pull/1538)
- [@isra17](https://github.com/isra17) made their first contribution in [#1575](https://github.com/PrefectHQ/fastmcp/pull/1575)
- [@marvin-context-protocol](https://github.com/marvin-context-protocol)[bot] made their first contribution in [#1616](https://github.com/PrefectHQ/fastmcp/pull/1616)
- [@pldesch-chift](https://github.com/pldesch-chift) made their first contribution in [#1578](https://github.com/PrefectHQ/fastmcp/pull/1578)
- [@vl-kp](https://github.com/vl-kp) made their first contribution in [#1636](https://github.com/PrefectHQ/fastmcp/pull/1636)
- [@romanusyk](https://github.com/romanusyk) made their first contribution in [#1667](https://github.com/PrefectHQ/fastmcp/pull/1667)

**Full Changelog**: [v2.11.3…v2.12.0](https://github.com/PrefectHQ/fastmcp/compare/v2.11.3...v2.12.0)

[​](#v2-11-3)

v2.11.3

2025-08-11

**[v2.11.3: API-tite for Change](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.11.3)**This release includes significant enhancements to the experimental OpenAPI parser and fixes a significant bug that led schemas not to be included in input/output schemas if they were transitive dependencies (e.g. A → B → C implies A depends on C). For users naively transforming large OpenAPI specs into MCP servers, this may result in ballooning payload sizes and necessitate curation.

## [​](#what’s-changed-20) What’s Changed

### [​](#enhancements--19) Enhancements 🔧

- Improve redirect handling to address 307’s by [@jlowin](https://github.com/jlowin) in [#1387](https://github.com/PrefectHQ/fastmcp/pull/1387)
- Ensure resource + template names are properly prefixed when importing/mounting by [@jlowin](https://github.com/jlowin) in [#1423](https://github.com/PrefectHQ/fastmcp/pull/1423)
- fixes #1398: Add JWT claims to AccessToken by [@panargirakis](https://github.com/panargirakis) in [#1399](https://github.com/PrefectHQ/fastmcp/pull/1399)
- Enable Protected Resource Metadata to provide resource\_name and resou… by [@yannj-fr](https://github.com/yannj-fr) in [#1371](https://github.com/PrefectHQ/fastmcp/pull/1371)
- Pin mcp SDK under 2.0 to avoid breaking changes by [@jlowin](https://github.com/jlowin) in [#1428](https://github.com/PrefectHQ/fastmcp/pull/1428)
- Clean up complexity from PR #1426 by [@jlowin](https://github.com/jlowin) in [#1435](https://github.com/PrefectHQ/fastmcp/pull/1435)
- Optimize OpenAPI payload size by 46% by [@jlowin](https://github.com/jlowin) in [#1452](https://github.com/PrefectHQ/fastmcp/pull/1452)
- Update static checks by [@jlowin](https://github.com/jlowin) in [#1448](https://github.com/PrefectHQ/fastmcp/pull/1448)

### [​](#fixes--33) Fixes 🐞

- Fix client-side logging bug #1394 by [@chi2liu](https://github.com/chi2liu) in [#1397](https://github.com/PrefectHQ/fastmcp/pull/1397)
- fix: Fix httpx\_client\_factory type annotation to match MCP SDK (#1402) by [@chi2liu](https://github.com/chi2liu) in [#1405](https://github.com/PrefectHQ/fastmcp/pull/1405)
- Fix OpenAPI allOf handling at requestBody top level (#1378) by [@chi2liu](https://github.com/chi2liu) in [#1425](https://github.com/PrefectHQ/fastmcp/pull/1425)
- Fix OpenAPI transitive references and performance (#1372) by [@jlowin](https://github.com/jlowin) in [#1426](https://github.com/PrefectHQ/fastmcp/pull/1426)
- fix(type): lifespan is partially unknown by [@ykun9](https://github.com/ykun9) in [#1389](https://github.com/PrefectHQ/fastmcp/pull/1389)
- Ensure transformed tools generate structured content by [@jlowin](https://github.com/jlowin) in [#1443](https://github.com/PrefectHQ/fastmcp/pull/1443)

### [​](#docs--21) Docs 📚

- docs(client/logging): reflect corrected default log level mapping by [@jlowin](https://github.com/jlowin) in [#1403](https://github.com/PrefectHQ/fastmcp/pull/1403)
- Add documentation for get\_access\_token() dependency function by [@jlowin](https://github.com/jlowin) in [#1446](https://github.com/PrefectHQ/fastmcp/pull/1446)

### [​](#other-changes--10) Other Changes 🦾

- Add comprehensive tests for utilities.components module by [@chi2liu](https://github.com/chi2liu) in [#1395](https://github.com/PrefectHQ/fastmcp/pull/1395)
- Consolidate agent instructions into AGENTS.md by [@jlowin](https://github.com/jlowin) in [#1404](https://github.com/PrefectHQ/fastmcp/pull/1404)
- Fix performance test threshold to prevent flaky failures by [@jlowin](https://github.com/jlowin) in [#1406](https://github.com/PrefectHQ/fastmcp/pull/1406)
- Update agents.md; add github instructions by [@jlowin](https://github.com/jlowin) in [#1410](https://github.com/PrefectHQ/fastmcp/pull/1410)
- Add Marvin assistant by [@jlowin](https://github.com/jlowin) in [#1412](https://github.com/PrefectHQ/fastmcp/pull/1412)
- Marvin: fix deprecated variable names by [@jlowin](https://github.com/jlowin) in [#1417](https://github.com/PrefectHQ/fastmcp/pull/1417)
- Simplify action setup and add github tools for Marvin by [@jlowin](https://github.com/jlowin) in [#1419](https://github.com/PrefectHQ/fastmcp/pull/1419)
- Update marvin workflow name by [@jlowin](https://github.com/jlowin) in [#1421](https://github.com/PrefectHQ/fastmcp/pull/1421)
- Improve GitHub templates by [@jlowin](https://github.com/jlowin) in [#1422](https://github.com/PrefectHQ/fastmcp/pull/1422)

## [​](#new-contributors-19) New Contributors

- [@panargirakis](https://github.com/panargirakis) made their first contribution in [#1399](https://github.com/PrefectHQ/fastmcp/pull/1399)
- [@ykun9](https://github.com/ykun9) made their first contribution in [#1389](https://github.com/PrefectHQ/fastmcp/pull/1389)
- [@yannj-fr](https://github.com/yannj-fr) made their first contribution in [#1371](https://github.com/PrefectHQ/fastmcp/pull/1371)

**Full Changelog**: [v2.11.2…v2.11.3](https://github.com/PrefectHQ/fastmcp/compare/v2.11.2...v2.11.3)

[​](#v2-11-2)

v2.11.2

2025-08-06

## [​](#v2-11-2-satis-factory) [v2.11.2: Satis-factory](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.11.2)

## [​](#what’s-changed-21) What’s Changed

### [​](#enhancements--20) Enhancements 🔧

- Support factory functions in fastmcp run by [@jlowin](https://github.com/jlowin) in [#1384](https://github.com/PrefectHQ/fastmcp/pull/1384)
- Add async support to client\_factory in FastMCPProxy (#1286) by [@bianning](https://github.com/bianning) in [#1375](https://github.com/PrefectHQ/fastmcp/pull/1375)

### [​](#fixes--34) Fixes 🐞

- Fix server\_version field in inspect manifest by [@jlowin](https://github.com/jlowin) in [#1383](https://github.com/PrefectHQ/fastmcp/pull/1383)
- Fix Settings field with both default and default\_factory by [@jlowin](https://github.com/jlowin) in [#1380](https://github.com/PrefectHQ/fastmcp/pull/1380)

### [​](#other-changes--11) Other Changes 🦾

- Remove unused arg by [@jlowin](https://github.com/jlowin) in [#1382](https://github.com/PrefectHQ/fastmcp/pull/1382)
- Add remote auth provider tests by [@jlowin](https://github.com/jlowin) in [#1351](https://github.com/PrefectHQ/fastmcp/pull/1351)

## [​](#new-contributors-20) New Contributors

- [@bianning](https://github.com/bianning) made their first contribution in [#1375](https://github.com/PrefectHQ/fastmcp/pull/1375)

**Full Changelog**: [v2.11.1…v2.11.2](https://github.com/PrefectHQ/fastmcp/compare/v2.11.1...v2.11.2)

[​](#v2-11-1)

v2.11.1

2025-08-04

## [​](#v2-11-1-you’re-better-auth-now) [v2.11.1: You’re Better Auth Now](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.11.1)

## [​](#what’s-changed-22) What’s Changed

### [​](#new-features--15) New Features 🎉

- Introduce `RemoteAuthProvider` for cleaner external identity provider integration, update docs by [@jlowin](https://github.com/jlowin) in [#1346](https://github.com/PrefectHQ/fastmcp/pull/1346)

### [​](#enhancements--21) Enhancements 🔧

- perf: optimize string operations in OpenAPI parameter processing by [@chi2liu](https://github.com/chi2liu) in [#1342](https://github.com/PrefectHQ/fastmcp/pull/1342)

### [​](#fixes--35) Fixes 🐞

- Fix method-bound FunctionTool schemas by [@strawgate](https://github.com/strawgate) in [#1360](https://github.com/PrefectHQ/fastmcp/pull/1360)
- Manually set `_key` after `model_copy()` to enable prefixing Transformed Tools by [@strawgate](https://github.com/strawgate) in [#1357](https://github.com/PrefectHQ/fastmcp/pull/1357)

### [​](#docs--22) Docs 📚

- Docs updates by [@jlowin](https://github.com/jlowin) in [#1336](https://github.com/PrefectHQ/fastmcp/pull/1336)
- Add 2.11 to changelog by [@jlowin](https://github.com/jlowin) in [#1337](https://github.com/PrefectHQ/fastmcp/pull/1337)
- Update AuthKit vocab by [@jlowin](https://github.com/jlowin) in [#1338](https://github.com/PrefectHQ/fastmcp/pull/1338)
- Fix typo in decorating-methods.mdx by [@Ozzuke](https://github.com/Ozzuke) in [#1344](https://github.com/PrefectHQ/fastmcp/pull/1344)

## [​](#new-contributors-21) New Contributors

- [@Ozzuke](https://github.com/Ozzuke) made their first contribution in [#1344](https://github.com/PrefectHQ/fastmcp/pull/1344)

**Full Changelog**: [v2.11.0…v2.11.1](https://github.com/PrefectHQ/fastmcp/compare/v2.11.0...v2.11.1)

[​](#v2-11-0)

v2.11.0

2025-08-01

## [​](#v2-11-0-auth-to-a-good-start) [v2.11.0: Auth to a Good Start](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.11.0)

FastMCP 2.11 doubles down on what developers need most: speed and simplicity. This massive release delivers significant performance improvements and a dramatically better developer experience.🔐 **Enterprise-Ready Authentication** brings comprehensive OAuth 2.1 support with WorkOS’s AuthKit integration. The new AuthProvider interface leverages MCP’s support for separate resource and authorization servers, handling API keys and remote authentication with Dynamic Client Registration. AuthKit integration means you can plug into existing enterprise identity systems without rebuilding your auth stack, setting the stage for plug-and-play auth that doesn’t require users to become security experts overnight.⚡ The **Experimental OpenAPI Parser** delivers dramatic performance improvements through single-pass schema processing and optimized memory usage. OpenAPI integrations are now significantly faster, with cleaner, more maintainable code. *(Note: the experimental parser is disabled by default, set `FASTMCPEXPERIMENTALENABLENEWOPENAPIPARSER=1` to enable it. A message will be shown to all users on the legacy parser encouraging them to try the new one before it becomes the default.)*🧠 **Context State Management** finally gives you persistent state across tool calls with a simple dict interface, while enhanced meta support lets you expose rich component metadata to clients. Combined with improved type annotations, string-based argument descriptions, and UV transport support, this release makes FastMCP feel more intuitive than ever.This release represents a TON of community contributions and sets the foundation for even more ambitious features ahead.

## [​](#what’s-changed-23) What’s Changed

### [​](#new-features--16) New Features 🎉

- Introduce experimental OpenAPI parser with improved performance and maintainability by [@jlowin](https://github.com/jlowin) in [#1209](https://github.com/PrefectHQ/fastmcp/pull/1209)
- Add state dict to Context (#1118) by [@mukulmurthy](https://github.com/mukulmurthy) in [#1160](https://github.com/PrefectHQ/fastmcp/pull/1160)
- Expose FastMCP tags to clients via component `meta` dict by [@jlowin](https://github.com/jlowin) in [#1281](https://github.com/PrefectHQ/fastmcp/pull/1281)
- Add \_fastmcp meta namespace by [@jlowin](https://github.com/jlowin) in [#1290](https://github.com/PrefectHQ/fastmcp/pull/1290)
- Add TokenVerifier protocol support alongside existing OAuthProvider authentication by [@jlowin](https://github.com/jlowin) in [#1297](https://github.com/PrefectHQ/fastmcp/pull/1297)
- Add comprehensive OAuth 2.1 authentication system with WorkOS integration by [@jlowin](https://github.com/jlowin) in [#1327](https://github.com/PrefectHQ/fastmcp/pull/1327)

### [​](#enhancements--22) Enhancements 🔧

- [🐶] Transform MCP Server Tools by [@strawgate](https://github.com/strawgate) in [#1132](https://github.com/PrefectHQ/fastmcp/pull/1132)
- Add —python, —project, and —with-requirements options to CLI commands by [@jlowin](https://github.com/jlowin) in [#1190](https://github.com/PrefectHQ/fastmcp/pull/1190)
- Support `fastmcp run mcp.json` by [@strawgate](https://github.com/strawgate) in [#1138](https://github.com/PrefectHQ/fastmcp/pull/1138)
- Support from **future** import annotations by [@jlowin](https://github.com/jlowin) in [#1199](https://github.com/PrefectHQ/fastmcp/pull/1199)
- Optimize OpenAPI parser performance with single-pass schema processing by [@jlowin](https://github.com/jlowin) in [#1214](https://github.com/PrefectHQ/fastmcp/pull/1214)
- Log tool name on transform validation error by [@strawgate](https://github.com/strawgate) in [#1238](https://github.com/PrefectHQ/fastmcp/pull/1238)
- Refactor `get_http_request` and `context.session_id` by [@hopeful0](https://github.com/hopeful0) in [#1242](https://github.com/PrefectHQ/fastmcp/pull/1242)
- Support creating tool argument descriptions from string annotations by [@jlowin](https://github.com/jlowin) in [#1255](https://github.com/PrefectHQ/fastmcp/pull/1255)
- feat: Add Annotations support for resources and resource templates by [@chughtapan](https://github.com/chughtapan) in [#1260](https://github.com/PrefectHQ/fastmcp/pull/1260)
- Add UV Transport by [@strawgate](https://github.com/strawgate) in [#1270](https://github.com/PrefectHQ/fastmcp/pull/1270)
- Improve OpenAPI-to-JSONSchema conversion utilities by [@jlowin](https://github.com/jlowin) in [#1283](https://github.com/PrefectHQ/fastmcp/pull/1283)
- Ensure proxy components forward meta dicts by [@jlowin](https://github.com/jlowin) in [#1282](https://github.com/PrefectHQ/fastmcp/pull/1282)
- fix: server argument passing in CLI run command by [@chughtapan](https://github.com/chughtapan) in [#1293](https://github.com/PrefectHQ/fastmcp/pull/1293)
- Add meta support to tool transformation utilities by [@jlowin](https://github.com/jlowin) in [#1295](https://github.com/PrefectHQ/fastmcp/pull/1295)
- feat: Allow Resource Metadata URL as field in OAuthProvider by [@dacamposol](https://github.com/dacamposol) in [#1287](https://github.com/PrefectHQ/fastmcp/pull/1287)
- Use a simple overwrite instead of a merge for meta by [@jlowin](https://github.com/jlowin) in [#1296](https://github.com/PrefectHQ/fastmcp/pull/1296)
- Remove unused TimedCache by [@strawgate](https://github.com/strawgate) in [#1303](https://github.com/PrefectHQ/fastmcp/pull/1303)
- refactor: standardize logging usage across OpenAPI utilities by [@chi2liu](https://github.com/chi2liu) in [#1322](https://github.com/PrefectHQ/fastmcp/pull/1322)
- perf: optimize OpenAPI parsing by reducing dict copy operations by [@chi2liu](https://github.com/chi2liu) in [#1321](https://github.com/PrefectHQ/fastmcp/pull/1321)
- Structured client-side logging by [@cjermain](https://github.com/cjermain) in [#1326](https://github.com/PrefectHQ/fastmcp/pull/1326)

### [​](#fixes--36) Fixes 🐞

- fix: preserve def reference when referenced in allOf / oneOf / anyOf by [@algirdasci](https://github.com/algirdasci) in [#1208](https://github.com/PrefectHQ/fastmcp/pull/1208)
- fix: add type hint to custom\_route decorator by [@zzstoatzz](https://github.com/zzstoatzz) in [#1210](https://github.com/PrefectHQ/fastmcp/pull/1210)
- chore: typo by [@richardkmichael](https://github.com/richardkmichael) in [#1216](https://github.com/PrefectHQ/fastmcp/pull/1216)
- fix: handle non-string $ref values in experimental OpenAPI parser by [@jlowin](https://github.com/jlowin) in [#1217](https://github.com/PrefectHQ/fastmcp/pull/1217)
- Skip repeated type conversion and validation in proxy client elicitation handler by [@chughtapan](https://github.com/chughtapan) in [#1222](https://github.com/PrefectHQ/fastmcp/pull/1222)
- Ensure default fields are not marked nullable by [@jlowin](https://github.com/jlowin) in [#1224](https://github.com/PrefectHQ/fastmcp/pull/1224)
- Fix stateful proxy client mixing in multi-proxies sessions by [@hopeful0](https://github.com/hopeful0) in [#1245](https://github.com/PrefectHQ/fastmcp/pull/1245)
- Fix invalid async context manager usage in proxy documentation by [@zzstoatzz](https://github.com/zzstoatzz) in [#1246](https://github.com/PrefectHQ/fastmcp/pull/1246)
- fix: experimental FastMCPOpenAPI server lost headers in request when **init**(client with headers) by [@itaru2622](https://github.com/itaru2622) in [#1254](https://github.com/PrefectHQ/fastmcp/pull/1254)
- Fix typing, add tests for tool call middleware by [@jlowin](https://github.com/jlowin) in [#1269](https://github.com/PrefectHQ/fastmcp/pull/1269)
- Fix: prune hidden parameter defs by [@muhammadkhalid-03](https://github.com/muhammadkhalid-03) in [#1257](https://github.com/PrefectHQ/fastmcp/pull/1257)
- Fix nullable field handling in OpenAPI to JSON Schema conversion by [@jlowin](https://github.com/jlowin) in [#1279](https://github.com/PrefectHQ/fastmcp/pull/1279)
- Ensure fastmcp run supports v1 servers by [@jlowin](https://github.com/jlowin) in [#1332](https://github.com/PrefectHQ/fastmcp/pull/1332)

### [​](#breaking-changes--5) Breaking Changes 🛫

- Change server flag to —name by [@jlowin](https://github.com/jlowin) in [#1248](https://github.com/PrefectHQ/fastmcp/pull/1248)

### [​](#docs--23) Docs 📚

- Remove unused import from FastAPI integration documentation by [@mariotaddeucci](https://github.com/mariotaddeucci) in [#1194](https://github.com/PrefectHQ/fastmcp/pull/1194)
- Update fastapi docs by [@jlowin](https://github.com/jlowin) in [#1198](https://github.com/PrefectHQ/fastmcp/pull/1198)
- Add docs for context state management by [@jlowin](https://github.com/jlowin) in [#1227](https://github.com/PrefectHQ/fastmcp/pull/1227)
- Permit.io integration docs by [@orweis](https://github.com/orweis) in [#1226](https://github.com/PrefectHQ/fastmcp/pull/1226)
- Update docs to reflect sync tools by [@jlowin](https://github.com/jlowin) in [#1234](https://github.com/PrefectHQ/fastmcp/pull/1234)
- Update changelog.mdx by [@jlowin](https://github.com/jlowin) in [#1235](https://github.com/PrefectHQ/fastmcp/pull/1235)
- Update SDK docs by [@jlowin](https://github.com/jlowin) in [#1236](https://github.com/PrefectHQ/fastmcp/pull/1236)
- Update —name flag documentation for Cursor/Claude by [@adam-conway](https://github.com/adam-conway) in [#1239](https://github.com/PrefectHQ/fastmcp/pull/1239)
- Add annotations docs by [@jlowin](https://github.com/jlowin) in [#1268](https://github.com/PrefectHQ/fastmcp/pull/1268)
- Update openapi/fastapi URLs README.md by [@jbn](https://github.com/jbn) in [#1278](https://github.com/PrefectHQ/fastmcp/pull/1278)
- Add 2.11 version badge for state management by [@jlowin](https://github.com/jlowin) in [#1289](https://github.com/PrefectHQ/fastmcp/pull/1289)
- Add meta parameter support to tools, resources, templates, and prompts decorators by [@jlowin](https://github.com/jlowin) in [#1294](https://github.com/PrefectHQ/fastmcp/pull/1294)
- docs: update get\_state and set\_state references by [@Maxi91f](https://github.com/Maxi91f) in [#1306](https://github.com/PrefectHQ/fastmcp/pull/1306)
- Add unit tests and docs for denying tool calls with middleware by [@jlowin](https://github.com/jlowin) in [#1333](https://github.com/PrefectHQ/fastmcp/pull/1333)
- Remove reference to stacked decorators by [@jlowin](https://github.com/jlowin) in [#1334](https://github.com/PrefectHQ/fastmcp/pull/1334)
- Eunomia authorization server can run embedded within the MCP server by [@tommitt](https://github.com/tommitt) in [#1317](https://github.com/PrefectHQ/fastmcp/pull/1317)

### [​](#other-changes--12) Other Changes 🦾

- Update README.md by [@jlowin](https://github.com/jlowin) in [#1230](https://github.com/PrefectHQ/fastmcp/pull/1230)
- Logcapture addition to test\_server file by [@Sourav-Tripathy](https://github.com/Sourav-Tripathy) in [#1229](https://github.com/PrefectHQ/fastmcp/pull/1229)
- Add tests for headers with both legacy and experimental openapi parser by [@jlowin](https://github.com/jlowin) in [#1259](https://github.com/PrefectHQ/fastmcp/pull/1259)
- Small clean-up from MCP Tool Transform PR by [@strawgate](https://github.com/strawgate) in [#1267](https://github.com/PrefectHQ/fastmcp/pull/1267)
- Add test for proxy tags visibility by [@jlowin](https://github.com/jlowin) in [#1302](https://github.com/PrefectHQ/fastmcp/pull/1302)
- Add unit test for sampling with image messages by [@jlowin](https://github.com/jlowin) in [#1329](https://github.com/PrefectHQ/fastmcp/pull/1329)
- Remove redundant resource\_metadata\_url assignment by [@jlowin](https://github.com/jlowin) in [#1328](https://github.com/PrefectHQ/fastmcp/pull/1328)
- Update bug.yml by [@jlowin](https://github.com/jlowin) in [#1331](https://github.com/PrefectHQ/fastmcp/pull/1331)
- Ensure validation errors are raised when masked by [@jlowin](https://github.com/jlowin) in [#1330](https://github.com/PrefectHQ/fastmcp/pull/1330)

## [​](#new-contributors-22) New Contributors

- [@mariotaddeucci](https://github.com/mariotaddeucci) made their first contribution in [#1194](https://github.com/PrefectHQ/fastmcp/pull/1194)
- [@algirdasci](https://github.com/algirdasci) made their first contribution in [#1208](https://github.com/PrefectHQ/fastmcp/pull/1208)
- [@chughtapan](https://github.com/chughtapan) made their first contribution in [#1222](https://github.com/PrefectHQ/fastmcp/pull/1222)
- [@mukulmurthy](https://github.com/mukulmurthy) made their first contribution in [#1160](https://github.com/PrefectHQ/fastmcp/pull/1160)
- [@orweis](https://github.com/orweis) made their first contribution in [#1226](https://github.com/PrefectHQ/fastmcp/pull/1226)
- [@Sourav-Tripathy](https://github.com/Sourav-Tripathy) made their first contribution in [#1229](https://github.com/PrefectHQ/fastmcp/pull/1229)
- [@adam-conway](https://github.com/adam-conway) made their first contribution in [#1239](https://github.com/PrefectHQ/fastmcp/pull/1239)
- [@muhammadkhalid-03](https://github.com/muhammadkhalid-03) made their first contribution in [#1257](https://github.com/PrefectHQ/fastmcp/pull/1257)
- [@jbn](https://github.com/jbn) made their first contribution in [#1278](https://github.com/PrefectHQ/fastmcp/pull/1278)
- [@dacamposol](https://github.com/dacamposol) made their first contribution in [#1287](https://github.com/PrefectHQ/fastmcp/pull/1287)
- [@chi2liu](https://github.com/chi2liu) made their first contribution in [#1322](https://github.com/PrefectHQ/fastmcp/pull/1322)
- [@cjermain](https://github.com/cjermain) made their first contribution in [#1326](https://github.com/PrefectHQ/fastmcp/pull/1326)

**Full Changelog**: [v2.10.6…v2.11.0](https://github.com/PrefectHQ/fastmcp/compare/v2.10.6...v2.11.0)

[​](#v2-10-6)

v2.10.6

2025-07-19

## [​](#v2-10-6-hymn-for-the-weekend) [v2.10.6: Hymn for the Weekend](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.10.6)

A special Saturday release with many fixes.

## [​](#what’s-changed-24) What’s Changed

### [​](#enhancements--23) Enhancements 🔧

- Resolve #1139 — Implement include\_context argument in Context.sample by [@codingjoe](https://github.com/codingjoe) in [#1141](https://github.com/PrefectHQ/fastmcp/pull/1141)
- feat(settings): add log level normalization by [@ka2048](https://github.com/ka2048) in [#1171](https://github.com/PrefectHQ/fastmcp/pull/1171)
- add server name to mounted server warnings by [@artificial-aidan](https://github.com/artificial-aidan) in [#1147](https://github.com/PrefectHQ/fastmcp/pull/1147)
- Add StatefulProxyClient by [@hopeful0](https://github.com/hopeful0) in [#1109](https://github.com/PrefectHQ/fastmcp/pull/1109)

### [​](#fixes--37) Fixes 🐞

- Fix OpenAPI empty parameters by [@FabrizioSandri](https://github.com/FabrizioSandri) in [#1128](https://github.com/PrefectHQ/fastmcp/pull/1128)
- Fix title field preservation in tool transformations by [@jlowin](https://github.com/jlowin) in [#1131](https://github.com/PrefectHQ/fastmcp/pull/1131)
- Fix optional parameter validation in OpenAPI integration by [@jlowin](https://github.com/jlowin) in [#1135](https://github.com/PrefectHQ/fastmcp/pull/1135)
- Do not silently exclude the “context” key from JSON body by [@melkamar](https://github.com/melkamar) in [#1153](https://github.com/PrefectHQ/fastmcp/pull/1153)
- Fix tool output schema generation to respect Pydantic serialization aliases by [@zzstoatzz](https://github.com/zzstoatzz) in [#1148](https://github.com/PrefectHQ/fastmcp/pull/1148)
- fix: \_replace\_ref\_with\_defs; ensure ref\_path is string by [@itaru2622](https://github.com/itaru2622) in [#1164](https://github.com/PrefectHQ/fastmcp/pull/1164)
- Fix nesting when making OpenAPI arrays and objects optional by [@melkamar](https://github.com/melkamar) in [#1178](https://github.com/PrefectHQ/fastmcp/pull/1178)
- Fix `mcp-json` output format to include server name by [@jlowin](https://github.com/jlowin) in [#1185](https://github.com/PrefectHQ/fastmcp/pull/1185)
- Only configure logging one time by [@jlowin](https://github.com/jlowin) in [#1187](https://github.com/PrefectHQ/fastmcp/pull/1187)

### [​](#docs--24) Docs 📚

- Update changelog.mdx by [@jlowin](https://github.com/jlowin) in [#1127](https://github.com/PrefectHQ/fastmcp/pull/1127)
- Eunomia Authorization with native FastMCP’s Middleware by [@tommitt](https://github.com/tommitt) in [#1144](https://github.com/PrefectHQ/fastmcp/pull/1144)
- update api ref for new `mdxify` version by [@zzstoatzz](https://github.com/zzstoatzz) in [#1182](https://github.com/PrefectHQ/fastmcp/pull/1182)

### [​](#other-changes--13) Other Changes 🦾

- Expand empty parameter filtering and add comprehensive tests by [@jlowin](https://github.com/jlowin) in [#1129](https://github.com/PrefectHQ/fastmcp/pull/1129)
- Add no-commit-to-branch hook by [@zzstoatzz](https://github.com/zzstoatzz) in [#1149](https://github.com/PrefectHQ/fastmcp/pull/1149)
- Update README.md by [@jlowin](https://github.com/jlowin) in [#1165](https://github.com/PrefectHQ/fastmcp/pull/1165)
- skip on rate limit by [@zzstoatzz](https://github.com/zzstoatzz) in [#1183](https://github.com/PrefectHQ/fastmcp/pull/1183)
- Remove deprecated proxy creation by [@jlowin](https://github.com/jlowin) in [#1186](https://github.com/PrefectHQ/fastmcp/pull/1186)
- Separate integration tests from unit tests in CI by [@jlowin](https://github.com/jlowin) in [#1188](https://github.com/PrefectHQ/fastmcp/pull/1188)

## [​](#new-contributors-23) New Contributors

- [@FabrizioSandri](https://github.com/FabrizioSandri) made their first contribution in [#1128](https://github.com/PrefectHQ/fastmcp/pull/1128)
- [@melkamar](https://github.com/melkamar) made their first contribution in [#1153](https://github.com/PrefectHQ/fastmcp/pull/1153)
- [@codingjoe](https://github.com/codingjoe) made their first contribution in [#1141](https://github.com/PrefectHQ/fastmcp/pull/1141)
- [@itaru2622](https://github.com/itaru2622) made their first contribution in [#1164](https://github.com/PrefectHQ/fastmcp/pull/1164)
- [@ka2048](https://github.com/ka2048) made their first contribution in [#1171](https://github.com/PrefectHQ/fastmcp/pull/1171)
- [@artificial-aidan](https://github.com/artificial-aidan) made their first contribution in [#1147](https://github.com/PrefectHQ/fastmcp/pull/1147)

**Full Changelog**: [v2.10.5…v2.10.6](https://github.com/PrefectHQ/fastmcp/compare/v2.10.5...v2.10.6)

[​](#v2-10-5)

v2.10.5

2025-07-11

## [​](#v2-10-5-middle-management) [v2.10.5: Middle Management](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.10.5)

A maintenance release focused on OpenAPI refinements and middleware fixes, plus console improvements.

## [​](#what’s-changed-25) What’s Changed

### [​](#enhancements--24) Enhancements 🔧

- Fix Claude Code CLI detection for npm global installations by [@jlowin](https://github.com/jlowin) in [#1106](https://github.com/PrefectHQ/fastmcp/pull/1106)
- Fix OpenAPI parameter name collisions with location suffixing by [@jlowin](https://github.com/jlowin) in [#1107](https://github.com/PrefectHQ/fastmcp/pull/1107)
- Add mirrored component support for proxy servers by [@jlowin](https://github.com/jlowin) in [#1105](https://github.com/PrefectHQ/fastmcp/pull/1105)

### [​](#fixes--38) Fixes 🐞

- Fix OpenAPI deepObject style parameter encoding by [@jlowin](https://github.com/jlowin) in [#1122](https://github.com/PrefectHQ/fastmcp/pull/1122)
- xfail when github token is not set (” or None) by [@jlowin](https://github.com/jlowin) in [#1123](https://github.com/PrefectHQ/fastmcp/pull/1123)
- fix: replace oneOf with anyOf in OpenAPI output schemas by [@MagnusS0](https://github.com/MagnusS0) in [#1119](https://github.com/PrefectHQ/fastmcp/pull/1119)
- Fix middleware list result types by [@jlowin](https://github.com/jlowin) in [#1125](https://github.com/PrefectHQ/fastmcp/pull/1125)
- Improve console width for logo by [@jlowin](https://github.com/jlowin) in [#1126](https://github.com/PrefectHQ/fastmcp/pull/1126)

### [​](#docs--25) Docs 📚

- Improve transport + integration docs by [@jlowin](https://github.com/jlowin) in [#1103](https://github.com/PrefectHQ/fastmcp/pull/1103)
- Update proxy.mdx by [@coldfire-x](https://github.com/coldfire-x) in [#1108](https://github.com/PrefectHQ/fastmcp/pull/1108)

### [​](#other-changes--14) Other Changes 🦾

- Update github remote server tests with secret by [@jlowin](https://github.com/jlowin) in [#1112](https://github.com/PrefectHQ/fastmcp/pull/1112)

## [​](#new-contributors-24) New Contributors

- [@coldfire-x](https://github.com/coldfire-x) made their first contribution in [#1108](https://github.com/PrefectHQ/fastmcp/pull/1108)
- [@MagnusS0](https://github.com/MagnusS0) made their first contribution in [#1119](https://github.com/PrefectHQ/fastmcp/pull/1119)

**Full Changelog**: [v2.10.4…v2.10.5](https://github.com/PrefectHQ/fastmcp/compare/v2.10.4...v2.10.5)

[​](#v2-10-4)

v2.10.4

2025-07-09

## [​](#v2-10-4-transport-ation) [v2.10.4: Transport-ation](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.10.4)

A quick fix to ensure the CLI accepts “streamable-http” as a valid transport option.

## [​](#what’s-changed-26) What’s Changed

### [​](#fixes--39) Fixes 🐞

- Ensure the CLI accepts “streamable-http” as a valid transport by [@jlowin](https://github.com/jlowin) in [#1099](https://github.com/PrefectHQ/fastmcp/pull/1099)

**Full Changelog**: [v2.10.3…v2.10.4](https://github.com/PrefectHQ/fastmcp/compare/v2.10.3...v2.10.4)

[​](#v2-10-3)

v2.10.3

2025-07-09

## [​](#v2-10-3-cli-me-a-river) [v2.10.3: CLI Me a River](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.10.3)

A major CLI overhaul featuring a complete refactor from typer to cyclopts, new IDE integrations, and comprehensive OpenAPI improvements.

## [​](#what’s-changed-27) What’s Changed

### [​](#new-features--17) New Features 🎉

- Refactor CLI from typer to cyclopts and add comprehensive tests by [@jlowin](https://github.com/jlowin) in [#1062](https://github.com/PrefectHQ/fastmcp/pull/1062)
- Add output schema support for OpenAPI tools by [@jlowin](https://github.com/jlowin) in [#1073](https://github.com/PrefectHQ/fastmcp/pull/1073)

### [​](#enhancements--25) Enhancements 🔧

- Add Cursor support via CLI integration by [@jlowin](https://github.com/jlowin) in [#1052](https://github.com/PrefectHQ/fastmcp/pull/1052)
- Add Claude Code install integration by [@jlowin](https://github.com/jlowin) in [#1053](https://github.com/PrefectHQ/fastmcp/pull/1053)
- Generate MCP JSON config output from CLI as new `fastmcp install` command by [@jlowin](https://github.com/jlowin) in [#1056](https://github.com/PrefectHQ/fastmcp/pull/1056)
- Use isawaitable instead of iscoroutine by [@jlowin](https://github.com/jlowin) in [#1059](https://github.com/PrefectHQ/fastmcp/pull/1059)
- feat: Add `--path` Option to CLI for HTTP/SSE Route by [@davidbk-legit](https://github.com/davidbk-legit) in [#1087](https://github.com/PrefectHQ/fastmcp/pull/1087)
- Fix concurrent proxy client operations with session isolation by [@jlowin](https://github.com/jlowin) in [#1083](https://github.com/PrefectHQ/fastmcp/pull/1083)

### [​](#fixes--40) Fixes 🐞

- Refactor Client context management to avoid concurrency issue by [@hopeful0](https://github.com/hopeful0) in [#1054](https://github.com/PrefectHQ/fastmcp/pull/1054)
- Keep json schema $defs on transform by [@strawgate](https://github.com/strawgate) in [#1066](https://github.com/PrefectHQ/fastmcp/pull/1066)
- Ensure fastmcp version copy is plaintext by [@jlowin](https://github.com/jlowin) in [#1071](https://github.com/PrefectHQ/fastmcp/pull/1071)
- Fix single-element list unwrapping in tool content by [@jlowin](https://github.com/jlowin) in [#1074](https://github.com/PrefectHQ/fastmcp/pull/1074)
- Fix max recursion error when pruning OpenAPI definitions by [@dimitribarbot](https://github.com/dimitribarbot) in [#1092](https://github.com/PrefectHQ/fastmcp/pull/1092)
- Fix OpenAPI tool name registration when modified by mcp\_component\_fn by [@jlowin](https://github.com/jlowin) in [#1096](https://github.com/PrefectHQ/fastmcp/pull/1096)

### [​](#docs--26) Docs 📚

- Docs: add example of more concise way to use bearer auth by [@neilconway](https://github.com/neilconway) in [#1055](https://github.com/PrefectHQ/fastmcp/pull/1055)
- Update favicon by [@jlowin](https://github.com/jlowin) in [#1058](https://github.com/PrefectHQ/fastmcp/pull/1058)
- Update environment note by [@jlowin](https://github.com/jlowin) in [#1075](https://github.com/PrefectHQ/fastmcp/pull/1075)
- Add fastmcp version —copy documentation by [@jlowin](https://github.com/jlowin) in [#1076](https://github.com/PrefectHQ/fastmcp/pull/1076)

### [​](#other-changes--15) Other Changes 🦾

- Remove asserts and add documentation following #1054 by [@jlowin](https://github.com/jlowin) in [#1057](https://github.com/PrefectHQ/fastmcp/pull/1057)
- Add —copy flag for fastmcp version by [@jlowin](https://github.com/jlowin) in [#1063](https://github.com/PrefectHQ/fastmcp/pull/1063)
- Fix docstring format for fastmcp.client.Client by [@neilconway](https://github.com/neilconway) in [#1094](https://github.com/PrefectHQ/fastmcp/pull/1094)

## [​](#new-contributors-25) New Contributors

- [@neilconway](https://github.com/neilconway) made their first contribution in [#1055](https://github.com/PrefectHQ/fastmcp/pull/1055)
- [@davidbk-legit](https://github.com/davidbk-legit) made their first contribution in [#1087](https://github.com/PrefectHQ/fastmcp/pull/1087)
- [@dimitribarbot](https://github.com/dimitribarbot) made their first contribution in [#1092](https://github.com/PrefectHQ/fastmcp/pull/1092)

**Full Changelog**: [v2.10.2…v2.10.3](https://github.com/PrefectHQ/fastmcp/compare/v2.10.2...v2.10.3)

[​](#v2-10-2)

v2.10.2

2025-07-05

## [​](#v2-10-2-forward-march) [v2.10.2: Forward March](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.10.2)

The headline feature of this release is the ability to “forward” advanced MCP interactions like logging, progress, and elicitation through proxy servers. If the remote server requests an elicitation, the proxy client will pass that request to the new, “ultimate” client.

## [​](#what’s-changed-28) What’s Changed

### [​](#new-features--18) New Features 🎉

- Proxy support advanced MCP features by [@hopeful0](https://github.com/hopeful0) in [#1022](https://github.com/PrefectHQ/fastmcp/pull/1022)

### [​](#enhancements--26) Enhancements 🔧

- Re-add splash screen by [@jlowin](https://github.com/jlowin) in [#1027](https://github.com/PrefectHQ/fastmcp/pull/1027)
- Reduce banner padding by [@jlowin](https://github.com/jlowin) in [#1030](https://github.com/PrefectHQ/fastmcp/pull/1030)
- Allow per-server timeouts in MCPConfig by [@cegersdoerfer](https://github.com/cegersdoerfer) in [#1031](https://github.com/PrefectHQ/fastmcp/pull/1031)
- Support ‘scp’ claim for OAuth scopes in BearerAuthProvider by [@jlowin](https://github.com/jlowin) in [#1033](https://github.com/PrefectHQ/fastmcp/pull/1033)
- Add path expansion to image/audio/file by [@jlowin](https://github.com/jlowin) in [#1038](https://github.com/PrefectHQ/fastmcp/pull/1038)
- Ensure multi-client configurations use new ProxyClient by [@jlowin](https://github.com/jlowin) in [#1045](https://github.com/PrefectHQ/fastmcp/pull/1045)

### [​](#fixes--41) Fixes 🐞

- Expose stateless\_http kwarg for mcp.run() by [@jlowin](https://github.com/jlowin) in [#1018](https://github.com/PrefectHQ/fastmcp/pull/1018)
- Avoid propagating logs by [@jlowin](https://github.com/jlowin) in [#1042](https://github.com/PrefectHQ/fastmcp/pull/1042)

### [​](#docs--27) Docs 📚

- Clean up docs by [@jlowin](https://github.com/jlowin) in [#1028](https://github.com/PrefectHQ/fastmcp/pull/1028)
- Docs: clarify server URL paths for ChatGPT integration by [@thap2331](https://github.com/thap2331) in [#1017](https://github.com/PrefectHQ/fastmcp/pull/1017)

### [​](#other-changes--16) Other Changes 🦾

- Split giant openapi test file into smaller files by [@jlowin](https://github.com/jlowin) in [#1034](https://github.com/PrefectHQ/fastmcp/pull/1034)
- Add comprehensive OpenAPI 3.0 vs 3.1 compatibility tests by [@jlowin](https://github.com/jlowin) in [#1035](https://github.com/PrefectHQ/fastmcp/pull/1035)
- Update banner and use console.log by [@jlowin](https://github.com/jlowin) in [#1041](https://github.com/PrefectHQ/fastmcp/pull/1041)

## [​](#new-contributors-26) New Contributors

- [@cegersdoerfer](https://github.com/cegersdoerfer) made their first contribution in [#1031](https://github.com/PrefectHQ/fastmcp/pull/1031)
- [@hopeful0](https://github.com/hopeful0) made their first contribution in [#1022](https://github.com/PrefectHQ/fastmcp/pull/1022)
- [@thap2331](https://github.com/thap2331) made their first contribution in [#1017](https://github.com/PrefectHQ/fastmcp/pull/1017)

**Full Changelog**: [v2.10.1…v2.10.2](https://github.com/PrefectHQ/fastmcp/compare/v2.10.1...v2.10.2)

[​](#v2-10-1)

v2.10.1

2025-07-02

## [​](#v2-10-1-revert-to-sender) [v2.10.1: Revert to Sender](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.10.1)

A quick patch to revert the CLI banner that was added in v2.10.0.

## [​](#what’s-changed-29) What’s Changed

### [​](#docs--28) Docs 📚

- Update changelog.mdx by [@jlowin](https://github.com/jlowin) in [#1009](https://github.com/PrefectHQ/fastmcp/pull/1009)
- Revert “Add CLI banner” by [@jlowin](https://github.com/jlowin) in [#1011](https://github.com/PrefectHQ/fastmcp/pull/1011)

**Full Changelog**: [v2.10.0…v2.10.1](https://github.com/PrefectHQ/fastmcp/compare/v2.10.0...v2.10.1)

[​](#v2-10-0)

v2.10.0

2024-07-01

## [​](#v2-10-0-great-spec-tations) [v2.10.0: Great Spec-tations](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.10.0)

FastMCP 2.10 brings full compliance with the 6/18/2025 MCP spec update, introducing elicitation support for dynamic server-client communication and output schemas for structured tool responses. Please note that due to these changes, this release also includes a breaking change to the return signature of `client.call_tool()`.

### [​](#elicitation-support) Elicitation Support

Elicitation allows MCP servers to request additional information from clients during tool execution, enabling more interactive and dynamic server behavior. This opens up new possibilities for tools that need user input or confirmation during execution.

### [​](#output-schemas) Output Schemas

Tools can now define structured output schemas, ensuring that responses conform to expected formats and making tool integration more predictable and type-safe.

## [​](#what’s-changed-30) What’s Changed

### [​](#new-features--19) New Features 🎉

- MCP 6/18/25: Add output schema to tools by [@jlowin](https://github.com/jlowin) in [#901](https://github.com/PrefectHQ/fastmcp/pull/901)
- MCP 6/18/25: Elicitation support by [@jlowin](https://github.com/jlowin) in [#889](https://github.com/PrefectHQ/fastmcp/pull/889)

### [​](#enhancements--27) Enhancements 🔧

- Update types + tests for SDK changes by [@jlowin](https://github.com/jlowin) in [#888](https://github.com/PrefectHQ/fastmcp/pull/888)
- MCP 6/18/25: Update auth primitives by [@jlowin](https://github.com/jlowin) in [#966](https://github.com/PrefectHQ/fastmcp/pull/966)
- Add OpenAPI extensions support to HTTPRoute by [@maddymanu](https://github.com/maddymanu) in [#977](https://github.com/PrefectHQ/fastmcp/pull/977)
- Add title field support to FastMCP components by [@jlowin](https://github.com/jlowin) in [#982](https://github.com/PrefectHQ/fastmcp/pull/982)
- Support implicit Elicitation acceptance by [@jlowin](https://github.com/jlowin) in [#983](https://github.com/PrefectHQ/fastmcp/pull/983)
- Support ‘no response’ elicitation requests by [@jlowin](https://github.com/jlowin) in [#992](https://github.com/PrefectHQ/fastmcp/pull/992)
- Add Support for Configurable Algorithms by [@sstene1](https://github.com/sstene1) in [#997](https://github.com/PrefectHQ/fastmcp/pull/997)

### [​](#fixes--42) Fixes 🐞

- Improve stdio error handling to raise connection failures immediately by [@jlowin](https://github.com/jlowin) in [#984](https://github.com/PrefectHQ/fastmcp/pull/984)
- Fix type hints for FunctionResource:fn by [@CfirTsabari](https://github.com/CfirTsabari) in [#986](https://github.com/PrefectHQ/fastmcp/pull/986)
- Update link to OpenAI MCP example by [@mossbanay](https://github.com/mossbanay) in [#985](https://github.com/PrefectHQ/fastmcp/pull/985)
- Fix output schema generation edge case by [@jlowin](https://github.com/jlowin) in [#995](https://github.com/PrefectHQ/fastmcp/pull/995)
- Refactor array parameter formatting to reduce code duplication by [@jlowin](https://github.com/jlowin) in [#1007](https://github.com/PrefectHQ/fastmcp/pull/1007)
- Fix OpenAPI array parameter explode handling by [@jlowin](https://github.com/jlowin) in [#1008](https://github.com/PrefectHQ/fastmcp/pull/1008)

### [​](#breaking-changes--6) Breaking Changes 🛫

- MCP 6/18/25: Upgrade to mcp 1.10 by [@jlowin](https://github.com/jlowin) in [#887](https://github.com/PrefectHQ/fastmcp/pull/887)

### [​](#docs--29) Docs 📚

- Update middleware imports and documentation by [@jlowin](https://github.com/jlowin) in [#999](https://github.com/PrefectHQ/fastmcp/pull/999)
- Update OpenAI docs by [@jlowin](https://github.com/jlowin) in [#1001](https://github.com/PrefectHQ/fastmcp/pull/1001)
- Add CLI banner by [@jlowin](https://github.com/jlowin) in [#1005](https://github.com/PrefectHQ/fastmcp/pull/1005)

### [​](#examples-&-contrib--3) Examples & Contrib 💡

- Component Manager by [@gorocode](https://github.com/gorocode) in [#976](https://github.com/PrefectHQ/fastmcp/pull/976)

### [​](#other-changes--17) Other Changes 🦾

- Minor auth improvements by [@jlowin](https://github.com/jlowin) in [#967](https://github.com/PrefectHQ/fastmcp/pull/967)
- Add .ccignore for copychat by [@jlowin](https://github.com/jlowin) in [#1000](https://github.com/PrefectHQ/fastmcp/pull/1000)

## [​](#new-contributors-27) New Contributors

- [@maddymanu](https://github.com/maddymanu) made their first contribution in [#977](https://github.com/PrefectHQ/fastmcp/pull/977)
- [@github0hello](https://github.com/github0hello) made their first contribution in [#979](https://github.com/PrefectHQ/fastmcp/pull/979)
- [@tommitt](https://github.com/tommitt) made their first contribution in [#975](https://github.com/PrefectHQ/fastmcp/pull/975)
- [@CfirTsabari](https://github.com/CfirTsabari) made their first contribution in [#986](https://github.com/PrefectHQ/fastmcp/pull/986)
- [@mossbanay](https://github.com/mossbanay) made their first contribution in [#985](https://github.com/PrefectHQ/fastmcp/pull/985)
- [@sstene1](https://github.com/sstene1) made their first contribution in [#997](https://github.com/PrefectHQ/fastmcp/pull/997)

**Full Changelog**: [v2.9.2…v2.10.0](https://github.com/PrefectHQ/fastmcp/compare/v2.9.2...v2.10.0)

[​](#v2-9-2)

v2.9.2

2024-06-26

## [​](#v2-9-2-safety-pin) [v2.9.2: Safety Pin](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.9.2)

This is a patch release to pin `mcp` below 1.10, which includes changes related to the 6/18/2025 MCP spec update and could potentially break functionality for some FastMCP users.

## [​](#what’s-changed-31) What’s Changed

### [​](#docs--30) Docs 📚

- Fix version badge for messages by [@jlowin](https://github.com/jlowin) in [#960](https://github.com/PrefectHQ/fastmcp/pull/960)

### [​](#dependencies--11) Dependencies 📦

- Pin mcp dependency by [@jlowin](https://github.com/jlowin) in [#962](https://github.com/PrefectHQ/fastmcp/pull/962)

**Full Changelog**: [v2.9.1…v2.9.2](https://github.com/PrefectHQ/fastmcp/compare/v2.9.1...v2.9.2)

[​](#v2-9-1)

v2.9.1

2024-06-26

## [​](#v2-9-1-call-me-maybe) [v2.9.1: Call Me Maybe](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.9.1)

FastMCP 2.9.1 introduces automatic MCP list change notifications, allowing servers to notify clients when tools, resources, or prompts are dynamically updated. This enables more responsive and adaptive MCP integrations.

## [​](#what’s-changed-32) What’s Changed

### [​](#new-features--20) New Features 🎉

- Add automatic MCP list change notifications and client message handling by [@jlowin](https://github.com/jlowin) in [#939](https://github.com/PrefectHQ/fastmcp/pull/939)

### [​](#enhancements--28) Enhancements 🔧

- Add debug logging to bearer token authentication by [@jlowin](https://github.com/jlowin) in [#952](https://github.com/PrefectHQ/fastmcp/pull/952)

### [​](#fixes--43) Fixes 🐞

- Fix duplicate error logging in exception handlers by [@jlowin](https://github.com/jlowin) in [#938](https://github.com/PrefectHQ/fastmcp/pull/938)
- Fix parameter location enum handling in OpenAPI parser by [@jlowin](https://github.com/jlowin) in [#953](https://github.com/PrefectHQ/fastmcp/pull/953)
- Fix external schema reference handling in OpenAPI parser by [@jlowin](https://github.com/jlowin) in [#954](https://github.com/PrefectHQ/fastmcp/pull/954)

### [​](#docs--31) Docs 📚

- Update changelog for 2.9 release by [@jlowin](https://github.com/jlowin) in [#929](https://github.com/PrefectHQ/fastmcp/pull/929)
- Regenerate API references by [@zzstoatzz](https://github.com/zzstoatzz) in [#935](https://github.com/PrefectHQ/fastmcp/pull/935)
- Regenerate API references by [@zzstoatzz](https://github.com/zzstoatzz) in [#947](https://github.com/PrefectHQ/fastmcp/pull/947)
- Regenerate API references by [@zzstoatzz](https://github.com/zzstoatzz) in [#949](https://github.com/PrefectHQ/fastmcp/pull/949)

### [​](#examples-&-contrib--4) Examples & Contrib 💡

- Add `create_thread` tool to bsky MCP server by [@zzstoatzz](https://github.com/zzstoatzz) in [#927](https://github.com/PrefectHQ/fastmcp/pull/927)
- Update `mount_example.py` to work with current fastmcp API by [@rajephon](https://github.com/rajephon) in [#957](https://github.com/PrefectHQ/fastmcp/pull/957)

## [​](#new-contributors-28) New Contributors

- [@rajephon](https://github.com/rajephon) made their first contribution in [#957](https://github.com/PrefectHQ/fastmcp/pull/957)

**Full Changelog**: [v2.9.0…v2.9.1](https://github.com/PrefectHQ/fastmcp/compare/v2.9.0...v2.9.1)

[​](#v2-9-0)

v2.9.0

2024-06-23

## [​](#v2-9-0-stuck-in-the-middleware-with-you) [v2.9.0: Stuck in the Middleware With You](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.9.0)

FastMCP 2.9 introduces two important features that push beyond the basic MCP protocol: MCP Middleware and server-side type conversion.

### [​](#mcp-middleware) MCP Middleware

MCP middleware lets you intercept and modify requests and responses at the protocol level, giving you powerful capabilities for logging, authentication, validation, and more. This is particularly useful for building production-ready MCP servers that need sophisticated request handling.

### [​](#server-side-type-conversion) Server-side Type Conversion

This release also introduces server-side type conversion for prompt arguments, ensuring that data is properly formatted before being passed to your functions. This reduces the burden on individual tools and prompts to handle type validation and conversion.

## [​](#what’s-changed-33) What’s Changed

### [​](#new-features--21) New Features 🎉

- Add File utility for binary data by [@gorocode](https://github.com/gorocode) in [#843](https://github.com/PrefectHQ/fastmcp/pull/843)
- Consolidate prefix logic into FastMCP methods by [@jlowin](https://github.com/jlowin) in [#861](https://github.com/PrefectHQ/fastmcp/pull/861)
- Add MCP Middleware by [@jlowin](https://github.com/jlowin) in [#870](https://github.com/PrefectHQ/fastmcp/pull/870)
- Implement server-side type conversion for prompt arguments by [@jlowin](https://github.com/jlowin) in [#908](https://github.com/PrefectHQ/fastmcp/pull/908)

### [​](#enhancements--29) Enhancements 🔧

- Fix tool description indentation issue by [@zfflxx](https://github.com/zfflxx) in [#845](https://github.com/PrefectHQ/fastmcp/pull/845)
- Add version parameter to FastMCP constructor by [@mkyutani](https://github.com/mkyutani) in [#842](https://github.com/PrefectHQ/fastmcp/pull/842)
- Update version to not be positional by [@jlowin](https://github.com/jlowin) in [#848](https://github.com/PrefectHQ/fastmcp/pull/848)
- Add key to component by [@jlowin](https://github.com/jlowin) in [#869](https://github.com/PrefectHQ/fastmcp/pull/869)
- Add session\_id property to Context for data sharing by [@jlowin](https://github.com/jlowin) in [#881](https://github.com/PrefectHQ/fastmcp/pull/881)
- Fix CORS documentation example by [@jlowin](https://github.com/jlowin) in [#895](https://github.com/PrefectHQ/fastmcp/pull/895)

### [​](#fixes--44) Fixes 🐞

- “report\_progress missing passing related\_request\_id causes notifications not working” by [@alexsee](https://github.com/alexsee) in [#838](https://github.com/PrefectHQ/fastmcp/pull/838)
- Fix JWT issuer validation to support string values per RFC 7519 by [@jlowin](https://github.com/jlowin) in [#892](https://github.com/PrefectHQ/fastmcp/pull/892)
- Fix BearerAuthProvider audience type annotations by [@jlowin](https://github.com/jlowin) in [#894](https://github.com/PrefectHQ/fastmcp/pull/894)

### [​](#docs--32) Docs 📚

- Add CLAUDE.md development guidelines by [@jlowin](https://github.com/jlowin) in [#880](https://github.com/PrefectHQ/fastmcp/pull/880)
- Update context docs for session\_id property by [@jlowin](https://github.com/jlowin) in [#882](https://github.com/PrefectHQ/fastmcp/pull/882)
- Add API reference by [@zzstoatzz](https://github.com/zzstoatzz) in [#893](https://github.com/PrefectHQ/fastmcp/pull/893)
- Fix API ref rendering by [@zzstoatzz](https://github.com/zzstoatzz) in [#900](https://github.com/PrefectHQ/fastmcp/pull/900)
- Simplify docs nav by [@jlowin](https://github.com/jlowin) in [#902](https://github.com/PrefectHQ/fastmcp/pull/902)
- Add fastmcp inspect command by [@jlowin](https://github.com/jlowin) in [#904](https://github.com/PrefectHQ/fastmcp/pull/904)
- Update client docs by [@jlowin](https://github.com/jlowin) in [#912](https://github.com/PrefectHQ/fastmcp/pull/912)
- Update docs nav by [@jlowin](https://github.com/jlowin) in [#913](https://github.com/PrefectHQ/fastmcp/pull/913)
- Update integration documentation for Claude Desktop, ChatGPT, and Claude Code by [@jlowin](https://github.com/jlowin) in [#915](https://github.com/PrefectHQ/fastmcp/pull/915)
- Add http as an alias for streamable http by [@jlowin](https://github.com/jlowin) in [#917](https://github.com/PrefectHQ/fastmcp/pull/917)
- Clean up parameter documentation by [@jlowin](https://github.com/jlowin) in [#918](https://github.com/PrefectHQ/fastmcp/pull/918)
- Add middleware examples for timing, logging, rate limiting, and error handling by [@jlowin](https://github.com/jlowin) in [#919](https://github.com/PrefectHQ/fastmcp/pull/919)
- ControlFlow → FastMCP rename by [@jlowin](https://github.com/jlowin) in [#922](https://github.com/PrefectHQ/fastmcp/pull/922)

### [​](#examples-&-contrib--5) Examples & Contrib 💡

- Add contrib.mcp\_mixin support for annotations by [@rsp2k](https://github.com/rsp2k) in [#860](https://github.com/PrefectHQ/fastmcp/pull/860)
- Add ATProto (Bluesky) MCP Server Example by [@zzstoatzz](https://github.com/zzstoatzz) in [#916](https://github.com/PrefectHQ/fastmcp/pull/916)
- Fix path in atproto example pyproject by [@zzstoatzz](https://github.com/zzstoatzz) in [#920](https://github.com/PrefectHQ/fastmcp/pull/920)
- Remove uv source in example by [@zzstoatzz](https://github.com/zzstoatzz) in [#921](https://github.com/PrefectHQ/fastmcp/pull/921)

## [​](#new-contributors-29) New Contributors

- [@alexsee](https://github.com/alexsee) made their first contribution in [#838](https://github.com/PrefectHQ/fastmcp/pull/838)
- [@zfflxx](https://github.com/zfflxx) made their first contribution in [#845](https://github.com/PrefectHQ/fastmcp/pull/845)
- [@mkyutani](https://github.com/mkyutani) made their first contribution in [#842](https://github.com/PrefectHQ/fastmcp/pull/842)
- [@gorocode](https://github.com/gorocode) made their first contribution in [#843](https://github.com/PrefectHQ/fastmcp/pull/843)
- [@rsp2k](https://github.com/rsp2k) made their first contribution in [#860](https://github.com/PrefectHQ/fastmcp/pull/860)
- [@owtaylor](https://github.com/owtaylor) made their first contribution in [#897](https://github.com/PrefectHQ/fastmcp/pull/897)
- [@Jason-CKY](https://github.com/Jason-CKY) made their first contribution in [#906](https://github.com/PrefectHQ/fastmcp/pull/906)

**Full Changelog**: [v2.8.1…v2.9.0](https://github.com/PrefectHQ/fastmcp/compare/v2.8.1...v2.9.0)

[​](#v2-8-1)

v2.8.1

2024-06-15

## [​](#v2-8-1-sound-judgement) [v2.8.1: Sound Judgement](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.8.1)

2.8.1 introduces audio support, as well as minor fixes and updates for deprecated features.

### [​](#audio-support) Audio Support

This release adds support for audio content in MCP tools and resources, expanding FastMCP’s multimedia capabilities beyond text and images.

## [​](#what’s-changed-34) What’s Changed

### [​](#new-features--22) New Features 🎉

- Add audio support by [@jlowin](https://github.com/jlowin) in [#833](https://github.com/PrefectHQ/fastmcp/pull/833)

### [​](#enhancements--30) Enhancements 🔧

- Add flag for disabling deprecation warnings by [@jlowin](https://github.com/jlowin) in [#802](https://github.com/PrefectHQ/fastmcp/pull/802)
- Add examples to Tool Arg Param transformation by [@strawgate](https://github.com/strawgate) in [#806](https://github.com/PrefectHQ/fastmcp/pull/806)

### [​](#fixes--45) Fixes 🐞

- Restore .settings access as deprecated by [@jlowin](https://github.com/jlowin) in [#800](https://github.com/PrefectHQ/fastmcp/pull/800)
- Ensure handling of false http kwargs correctly; removed unused kwarg by [@jlowin](https://github.com/jlowin) in [#804](https://github.com/PrefectHQ/fastmcp/pull/804)
- Bump mcp 1.9.4 by [@jlowin](https://github.com/jlowin) in [#835](https://github.com/PrefectHQ/fastmcp/pull/835)

### [​](#docs--33) Docs 📚

- Update changelog for 2.8.0 by [@jlowin](https://github.com/jlowin) in [#794](https://github.com/PrefectHQ/fastmcp/pull/794)
- Update welcome docs by [@jlowin](https://github.com/jlowin) in [#808](https://github.com/PrefectHQ/fastmcp/pull/808)
- Update headers in docs by [@jlowin](https://github.com/jlowin) in [#809](https://github.com/PrefectHQ/fastmcp/pull/809)
- Add MCP group to tutorials by [@jlowin](https://github.com/jlowin) in [#810](https://github.com/PrefectHQ/fastmcp/pull/810)
- Add Community section to documentation by [@zzstoatzz](https://github.com/zzstoatzz) in [#819](https://github.com/PrefectHQ/fastmcp/pull/819)
- Add 2.8 update by [@jlowin](https://github.com/jlowin) in [#821](https://github.com/PrefectHQ/fastmcp/pull/821)
- Embed YouTube videos in community showcase by [@zzstoatzz](https://github.com/zzstoatzz) in [#820](https://github.com/PrefectHQ/fastmcp/pull/820)

### [​](#other-changes--18) Other Changes 🦾

- Ensure http args are passed through by [@jlowin](https://github.com/jlowin) in [#803](https://github.com/PrefectHQ/fastmcp/pull/803)
- Fix install link in readme by [@jlowin](https://github.com/jlowin) in [#836](https://github.com/PrefectHQ/fastmcp/pull/836)

**Full Changelog**: [v2.8.0…v2.8.1](https://github.com/PrefectHQ/fastmcp/compare/v2.8.0...v2.8.1)

[​](#v2-8-0)

v2.8.0

2024-06-10

## [​](#v2-8-0-transform-and-roll-out) [v2.8.0: Transform and Roll Out](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.8.0)

FastMCP 2.8.0 introduces powerful new ways to customize and control your MCP servers!

### [​](#tool-transformation) Tool Transformation

The highlight of this release is first-class [**Tool Transformation**](gofastmcp__com__servers__transforms__tool-transformation.md), a new feature that lets you create enhanced variations of existing tools. You can now easily rename arguments, hide parameters, modify descriptions, and even wrap tools with custom validation or post-processing logic—all without rewriting the original code. This makes it easier than ever to adapt generic tools for specific LLM use cases or to simplify complex APIs. Huge thanks to [@strawgate](https://github.com/strawgate) for partnering on this, starting with [#591](https://github.com/PrefectHQ/fastmcp/discussions/591) and [#599](https://github.com/PrefectHQ/fastmcp/pull/599) and continuing offline.

### [​](#component-control) Component Control

This release also gives you more granular control over which components are exposed to clients. With new [**tag-based filtering**](gofastmcp__com__servers__server.md), you can selectively enable or disable tools, resources, and prompts based on tags, perfect for managing different environments or user permissions. Complementing this, every component now supports being [programmatically enabled or disabled](gofastmcp__com__servers__tools.md), offering dynamic control over your server’s capabilities.

### [​](#tools-by-default) Tools-by-Default

Finally, to improve compatibility with a wider range of LLM clients, this release changes the default behavior for OpenAPI integration: all API endpoints are now converted to `Tools` by default. This is a **breaking change** but pragmatically necessitated by the fact that the majority of MCP clients available today are, sadly, only compatible with MCP tools. Therefore, this change significantly simplifies the out-of-the-box experience and ensures your entire API is immediately accessible to any tool-using agent.

## [​](#what’s-changed-35) What’s Changed

### [​](#new-features--23) New Features 🎉

- First-class tool transformation by [@jlowin](https://github.com/jlowin) in [#745](https://github.com/PrefectHQ/fastmcp/pull/745)
- Support enable/disable for all FastMCP components (tools, prompts, resources, templates) by [@jlowin](https://github.com/jlowin) in [#781](https://github.com/PrefectHQ/fastmcp/pull/781)
- Add support for tag-based component filtering by [@jlowin](https://github.com/jlowin) in [#748](https://github.com/PrefectHQ/fastmcp/pull/748)
- Allow tag assignments for OpenAPI by [@jlowin](https://github.com/jlowin) in [#791](https://github.com/PrefectHQ/fastmcp/pull/791)

### [​](#enhancements--31) Enhancements 🔧

- Create common base class for components by [@jlowin](https://github.com/jlowin) in [#776](https://github.com/PrefectHQ/fastmcp/pull/776)
- Move components to own file; add resource by [@jlowin](https://github.com/jlowin) in [#777](https://github.com/PrefectHQ/fastmcp/pull/777)
- Update FastMCP component with **eq** and **repr** by [@jlowin](https://github.com/jlowin) in [#779](https://github.com/PrefectHQ/fastmcp/pull/779)
- Remove open-ended and server-specific settings by [@jlowin](https://github.com/jlowin) in [#750](https://github.com/PrefectHQ/fastmcp/pull/750)

### [​](#fixes--46) Fixes 🐞

- Ensure client is only initialized once by [@jlowin](https://github.com/jlowin) in [#758](https://github.com/PrefectHQ/fastmcp/pull/758)
- Fix field validator for resource by [@jlowin](https://github.com/jlowin) in [#778](https://github.com/PrefectHQ/fastmcp/pull/778)
- Ensure proxies can overwrite remote tools without falling back to the remote by [@jlowin](https://github.com/jlowin) in [#782](https://github.com/PrefectHQ/fastmcp/pull/782)

### [​](#breaking-changes--7) Breaking Changes 🛫

- Treat all openapi routes as tools by [@jlowin](https://github.com/jlowin) in [#788](https://github.com/PrefectHQ/fastmcp/pull/788)
- Fix issue with global OpenAPI tags by [@jlowin](https://github.com/jlowin) in [#792](https://github.com/PrefectHQ/fastmcp/pull/792)

### [​](#docs--34) Docs 📚

- Minor docs updates by [@jlowin](https://github.com/jlowin) in [#755](https://github.com/PrefectHQ/fastmcp/pull/755)
- Add 2.7 update by [@jlowin](https://github.com/jlowin) in [#756](https://github.com/PrefectHQ/fastmcp/pull/756)
- Reduce 2.7 image size by [@jlowin](https://github.com/jlowin) in [#757](https://github.com/PrefectHQ/fastmcp/pull/757)
- Update updates.mdx by [@jlowin](https://github.com/jlowin) in [#765](https://github.com/PrefectHQ/fastmcp/pull/765)
- Hide docs sidebar scrollbar by default by [@jlowin](https://github.com/jlowin) in [#766](https://github.com/PrefectHQ/fastmcp/pull/766)
- Add “stop vibe testing” to tutorials by [@jlowin](https://github.com/jlowin) in [#767](https://github.com/PrefectHQ/fastmcp/pull/767)
- Add docs links by [@jlowin](https://github.com/jlowin) in [#768](https://github.com/PrefectHQ/fastmcp/pull/768)
- Fix: updated variable name under Gemini remote client by [@yrangana](https://github.com/yrangana) in [#769](https://github.com/PrefectHQ/fastmcp/pull/769)
- Revert “Hide docs sidebar scrollbar by default” by [@jlowin](https://github.com/jlowin) in [#770](https://github.com/PrefectHQ/fastmcp/pull/770)
- Add updates by [@jlowin](https://github.com/jlowin) in [#773](https://github.com/PrefectHQ/fastmcp/pull/773)
- Add tutorials by [@jlowin](https://github.com/jlowin) in [#783](https://github.com/PrefectHQ/fastmcp/pull/783)
- Update LLM-friendly docs by [@jlowin](https://github.com/jlowin) in [#784](https://github.com/PrefectHQ/fastmcp/pull/784)
- Update oauth.mdx by [@JeremyCraigMartinez](https://github.com/JeremyCraigMartinez) in [#787](https://github.com/PrefectHQ/fastmcp/pull/787)
- Add changelog by [@jlowin](https://github.com/jlowin) in [#789](https://github.com/PrefectHQ/fastmcp/pull/789)
- Add tutorials by [@jlowin](https://github.com/jlowin) in [#790](https://github.com/PrefectHQ/fastmcp/pull/790)
- Add docs for tag-based filtering by [@jlowin](https://github.com/jlowin) in [#793](https://github.com/PrefectHQ/fastmcp/pull/793)

### [​](#other-changes--19) Other Changes 🦾

- Create dependabot.yml by [@jlowin](https://github.com/jlowin) in [#759](https://github.com/PrefectHQ/fastmcp/pull/759)
- Bump astral-sh/setup-uv from 3 to 6 by [@dependabot](https://github.com/dependabot) in [#760](https://github.com/PrefectHQ/fastmcp/pull/760)
- Add dependencies section to release by [@jlowin](https://github.com/jlowin) in [#761](https://github.com/PrefectHQ/fastmcp/pull/761)
- Remove extra imports for MCPConfig by [@Maanas-Verma](https://github.com/Maanas-Verma) in [#763](https://github.com/PrefectHQ/fastmcp/pull/763)
- Split out enhancements in release notes by [@jlowin](https://github.com/jlowin) in [#764](https://github.com/PrefectHQ/fastmcp/pull/764)

## [​](#new-contributors-30) New Contributors

- [@dependabot](https://github.com/dependabot) made their first contribution in [#760](https://github.com/PrefectHQ/fastmcp/pull/760)
- [@Maanas-Verma](https://github.com/Maanas-Verma) made their first contribution in [#763](https://github.com/PrefectHQ/fastmcp/pull/763)
- [@JeremyCraigMartinez](https://github.com/JeremyCraigMartinez) made their first contribution in [#787](https://github.com/PrefectHQ/fastmcp/pull/787)

**Full Changelog**: [v2.7.1…v2.8.0](https://github.com/PrefectHQ/fastmcp/compare/v2.7.1...v2.8.0)

[​](#v2-7-1)

v2.7.1

2024-06-08

## [​](#v2-7-1-the-bearer-necessities) [v2.7.1: The Bearer Necessities](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.7.1)

This release primarily contains a fix for parsing string tokens that are provided to FastMCP clients.

### [​](#new-features--24) New Features 🎉

- Respect cache setting, set default to 1 second by [@jlowin](https://github.com/jlowin) in [#747](https://github.com/PrefectHQ/fastmcp/pull/747)

### [​](#fixes--47) Fixes 🐞

- Ensure event store is properly typed by [@jlowin](https://github.com/jlowin) in [#753](https://github.com/PrefectHQ/fastmcp/pull/753)
- Fix passing token string to client auth & add auth to MCPConfig clients by [@jlowin](https://github.com/jlowin) in [#754](https://github.com/PrefectHQ/fastmcp/pull/754)

### [​](#docs--35) Docs 📚

- Docs : fix client to mcp\_client in Gemini example by [@yrangana](https://github.com/yrangana) in [#734](https://github.com/PrefectHQ/fastmcp/pull/734)
- update add tool docstring by [@strawgate](https://github.com/strawgate) in [#739](https://github.com/PrefectHQ/fastmcp/pull/739)
- Fix contrib link by [@richardkmichael](https://github.com/richardkmichael) in [#749](https://github.com/PrefectHQ/fastmcp/pull/749)

### [​](#other-changes--20) Other Changes 🦾

- Switch Pydantic defaults to kwargs by [@strawgate](https://github.com/strawgate) in [#731](https://github.com/PrefectHQ/fastmcp/pull/731)
- Fix Typo in CLI module by [@wfclark5](https://github.com/wfclark5) in [#737](https://github.com/PrefectHQ/fastmcp/pull/737)
- chore: fix prompt docstring by [@danb27](https://github.com/danb27) in [#752](https://github.com/PrefectHQ/fastmcp/pull/752)
- Add accept to excluded headers by [@jlowin](https://github.com/jlowin) in [#751](https://github.com/PrefectHQ/fastmcp/pull/751)

### [​](#new-contributors-31) New Contributors

- [@wfclark5](https://github.com/wfclark5) made their first contribution in [#737](https://github.com/PrefectHQ/fastmcp/pull/737)
- [@richardkmichael](https://github.com/richardkmichael) made their first contribution in [#749](https://github.com/PrefectHQ/fastmcp/pull/749)
- [@danb27](https://github.com/danb27) made their first contribution in [#752](https://github.com/PrefectHQ/fastmcp/pull/752)

**Full Changelog**: [v2.7.0…v2.7.1](https://github.com/PrefectHQ/fastmcp/compare/v2.7.0...v2.7.1)

[​](#v2-7-0)

v2.7.0

2024-06-05

## [​](#v2-7-0-pare-programming) [v2.7.0: Pare Programming](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.7.0)

This is primarily a housekeeping release to remove or deprecate cruft that’s accumulated since v1. Primarily, this release refactors FastMCP’s internals in preparation for features planned in the next few major releases. However please note that as a result, this release has some minor breaking changes (which is why it’s 2.7, not 2.6.2, in accordance with repo guidelines) though not to the core user-facing APIs.

### [​](#breaking-changes--8) Breaking Changes 🛫

- decorators return the objects they create, not the decorated function
- websockets is an optional dependency
- methods on the server for automatically converting functions into tools/resources/prompts have been deprecated in favor of using the decorators directly

### [​](#new-features--25) New Features 🎉

- allow passing flags to servers by [@zzstoatzz](https://github.com/zzstoatzz) in [#690](https://github.com/PrefectHQ/fastmcp/pull/690)
- replace ref pointing to `#/components/schemas/` with `#/defs/` by [@phateffect](https://github.com/phateffect) in [#697](https://github.com/PrefectHQ/fastmcp/pull/697)
- Split Tool into Tool and FunctionTool by [@jlowin](https://github.com/jlowin) in [#700](https://github.com/PrefectHQ/fastmcp/pull/700)
- Use strict basemodel for Prompt; relax from\_function deprecation by [@jlowin](https://github.com/jlowin) in [#701](https://github.com/PrefectHQ/fastmcp/pull/701)
- Formalize resource/functionresource replationship by [@jlowin](https://github.com/jlowin) in [#702](https://github.com/PrefectHQ/fastmcp/pull/702)
- Formalize template/functiontemplate split by [@jlowin](https://github.com/jlowin) in [#703](https://github.com/PrefectHQ/fastmcp/pull/703)
- Support flexible @tool decorator call patterns by [@jlowin](https://github.com/jlowin) in [#706](https://github.com/PrefectHQ/fastmcp/pull/706)
- Ensure deprecation warnings have stacklevel=2 by [@jlowin](https://github.com/jlowin) in [#710](https://github.com/PrefectHQ/fastmcp/pull/710)
- Allow naked prompt decorator by [@jlowin](https://github.com/jlowin) in [#711](https://github.com/PrefectHQ/fastmcp/pull/711)

### [​](#fixes--48) Fixes 🐞

- Updates / Fixes for Tool Content Conversion by [@strawgate](https://github.com/strawgate) in [#642](https://github.com/PrefectHQ/fastmcp/pull/642)
- Fix pr labeler permissions by [@jlowin](https://github.com/jlowin) in [#708](https://github.com/PrefectHQ/fastmcp/pull/708)
- remove -n auto by [@jlowin](https://github.com/jlowin) in [#709](https://github.com/PrefectHQ/fastmcp/pull/709)
- Fix links in README.md by [@alainivars](https://github.com/alainivars) in [#723](https://github.com/PrefectHQ/fastmcp/pull/723)

Happily, this release DOES permit the use of “naked” decorators to align with Pythonic practice:

def my_tool():
    ...

**Full Changelog**: [v2.6.2…v2.7.0](https://github.com/PrefectHQ/fastmcp/compare/v2.6.2...v2.7.0)

[​](#v2-6-1)

v2.6.1

2024-06-03

## [​](#v2-6-1-blast-auth-second-ignition) [v2.6.1: Blast Auth (second ignition)](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.6.1)

This is a patch release to restore py.typed in #686.

### [​](#docs--36) Docs 📚

- Update readme by [@jlowin](https://github.com/jlowin) in [#679](https://github.com/PrefectHQ/fastmcp/pull/679)
- Add gemini tutorial by [@jlowin](https://github.com/jlowin) in [#680](https://github.com/PrefectHQ/fastmcp/pull/680)
- Fix : fix path error to CLI Documentation by [@yrangana](https://github.com/yrangana) in [#684](https://github.com/PrefectHQ/fastmcp/pull/684)
- Update auth docs by [@jlowin](https://github.com/jlowin) in [#687](https://github.com/PrefectHQ/fastmcp/pull/687)

### [​](#other-changes--21) Other Changes 🦾

- Remove deprecation notice by [@jlowin](https://github.com/jlowin) in [#677](https://github.com/PrefectHQ/fastmcp/pull/677)
- Delete server.py by [@jlowin](https://github.com/jlowin) in [#681](https://github.com/PrefectHQ/fastmcp/pull/681)
- Restore py.typed by [@jlowin](https://github.com/jlowin) in [#686](https://github.com/PrefectHQ/fastmcp/pull/686)

### [​](#new-contributors-32) New Contributors

- [@yrangana](https://github.com/yrangana) made their first contribution in [#684](https://github.com/PrefectHQ/fastmcp/pull/684)

**Full Changelog**: [v2.6.0…v2.6.1](https://github.com/PrefectHQ/fastmcp/compare/v2.6.0...v2.6.1)

[​](#v2-6-0)

v2.6.0

2024-06-02

## [​](#v2-6-0-blast-auth) [v2.6.0: Blast Auth](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.6.0)

### [​](#new-features--26) New Features 🎉

- Introduce MCP client oauth flow by [@jlowin](https://github.com/jlowin) in [#478](https://github.com/PrefectHQ/fastmcp/pull/478)
- Support providing tools at init by [@jlowin](https://github.com/jlowin) in [#647](https://github.com/PrefectHQ/fastmcp/pull/647)
- Simplify code for running servers in processes during tests by [@jlowin](https://github.com/jlowin) in [#649](https://github.com/PrefectHQ/fastmcp/pull/649)
- Add basic bearer auth for server and client by [@jlowin](https://github.com/jlowin) in [#650](https://github.com/PrefectHQ/fastmcp/pull/650)
- Support configuring bearer auth from env vars by [@jlowin](https://github.com/jlowin) in [#652](https://github.com/PrefectHQ/fastmcp/pull/652)
- feat(tool): add support for excluding arguments from tool definition by [@deepak-stratforge](https://github.com/deepak-stratforge) in [#626](https://github.com/PrefectHQ/fastmcp/pull/626)
- Add docs for server + client auth by [@jlowin](https://github.com/jlowin) in [#655](https://github.com/PrefectHQ/fastmcp/pull/655)

### [​](#fixes--49) Fixes 🐞

- fix: Support concurrency in FastMcpProxy (and Client) by [@Sillocan](https://github.com/Sillocan) in [#635](https://github.com/PrefectHQ/fastmcp/pull/635)
- Ensure Client.close() cleans up client context appropriately by [@jlowin](https://github.com/jlowin) in [#643](https://github.com/PrefectHQ/fastmcp/pull/643)
- Update client.mdx: ClientError namespace by [@mjkaye](https://github.com/mjkaye) in [#657](https://github.com/PrefectHQ/fastmcp/pull/657)

### [​](#docs--37) Docs 📚

- Make FastMCPTransport support simulated Streamable HTTP Transport (didn’t work) by [@jlowin](https://github.com/jlowin) in [#645](https://github.com/PrefectHQ/fastmcp/pull/645)
- Document exclude\_args by [@jlowin](https://github.com/jlowin) in [#653](https://github.com/PrefectHQ/fastmcp/pull/653)
- Update welcome by [@jlowin](https://github.com/jlowin) in [#673](https://github.com/PrefectHQ/fastmcp/pull/673)
- Add Anthropic + Claude desktop integration guides by [@jlowin](https://github.com/jlowin) in [#674](https://github.com/PrefectHQ/fastmcp/pull/674)
- Minor docs design updates by [@jlowin](https://github.com/jlowin) in [#676](https://github.com/PrefectHQ/fastmcp/pull/676)

### [​](#other-changes--22) Other Changes 🦾

- Update test typing by [@jlowin](https://github.com/jlowin) in [#646](https://github.com/PrefectHQ/fastmcp/pull/646)
- Add OpenAI integration docs by [@jlowin](https://github.com/jlowin) in [#660](https://github.com/PrefectHQ/fastmcp/pull/660)

### [​](#new-contributors-33) New Contributors

- [@Sillocan](https://github.com/Sillocan) made their first contribution in [#635](https://github.com/PrefectHQ/fastmcp/pull/635)
- [@deepak-stratforge](https://github.com/deepak-stratforge) made their first contribution in [#626](https://github.com/PrefectHQ/fastmcp/pull/626)
- [@mjkaye](https://github.com/mjkaye) made their first contribution in [#657](https://github.com/PrefectHQ/fastmcp/pull/657)

**Full Changelog**: [v2.5.2…v2.6.0](https://github.com/PrefectHQ/fastmcp/compare/v2.5.2...v2.6.0)

[​](#v2-5-2)

v2.5.2

2024-05-29

## [​](#v2-5-2-stayin’-alive) [v2.5.2: Stayin’ Alive](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.5.2)

### [​](#new-features--27) New Features 🎉

- Add graceful error handling for unreachable mounted servers by [@davenpi](https://github.com/davenpi) in [#605](https://github.com/PrefectHQ/fastmcp/pull/605)
- Improve type inference from client transport by [@jlowin](https://github.com/jlowin) in [#623](https://github.com/PrefectHQ/fastmcp/pull/623)
- Add keep\_alive param to reuse subprocess by [@jlowin](https://github.com/jlowin) in [#624](https://github.com/PrefectHQ/fastmcp/pull/624)

### [​](#fixes--50) Fixes 🐞

- Fix handling tools without descriptions by [@jlowin](https://github.com/jlowin) in [#610](https://github.com/PrefectHQ/fastmcp/pull/610)
- Don’t print env vars to console when format is wrong by [@jlowin](https://github.com/jlowin) in [#615](https://github.com/PrefectHQ/fastmcp/pull/615)
- Ensure behavior-affecting headers are excluded when forwarding proxies/openapi by [@jlowin](https://github.com/jlowin) in [#620](https://github.com/PrefectHQ/fastmcp/pull/620)

### [​](#docs--38) Docs 📚

- Add notes about uv and claude desktop by [@jlowin](https://github.com/jlowin) in [#597](https://github.com/PrefectHQ/fastmcp/pull/597)

### [​](#other-changes--23) Other Changes 🦾

- add init\_timeout for mcp client by [@jfouret](https://github.com/jfouret) in [#607](https://github.com/PrefectHQ/fastmcp/pull/607)
- Add init\_timeout for mcp client (incl settings) by [@jlowin](https://github.com/jlowin) in [#609](https://github.com/PrefectHQ/fastmcp/pull/609)
- Support for uppercase letters at the log level by [@ksawaray](https://github.com/ksawaray) in [#625](https://github.com/PrefectHQ/fastmcp/pull/625)

### [​](#new-contributors-34) New Contributors

- [@jfouret](https://github.com/jfouret) made their first contribution in [#607](https://github.com/PrefectHQ/fastmcp/pull/607)
- [@ksawaray](https://github.com/ksawaray) made their first contribution in [#625](https://github.com/PrefectHQ/fastmcp/pull/625)

**Full Changelog**: [v2.5.1…v2.5.2](https://github.com/PrefectHQ/fastmcp/compare/v2.5.1...v2.5.2)

[​](#v2-5-1)

v2.5.1

2024-05-24

## [​](#v2-5-1-route-awakening-part-2) [v2.5.1: Route Awakening (Part 2)](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.5.1)

### [​](#fixes--51) Fixes 🐞

- Ensure content-length is always stripped from client headers by [@jlowin](https://github.com/jlowin) in [#589](https://github.com/PrefectHQ/fastmcp/pull/589)

### [​](#docs--39) Docs 📚

- Fix redundant section of docs by [@jlowin](https://github.com/jlowin) in [#583](https://github.com/PrefectHQ/fastmcp/pull/583)

**Full Changelog**: [v2.5.0…v2.5.1](https://github.com/PrefectHQ/fastmcp/compare/v2.5.0...v2.5.1)

[​](#v2-5-0)

v2.5.0

2024-05-24

## [​](#v2-5-0-route-awakening) [v2.5.0: Route Awakening](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.5.0)

This release introduces completely new tools for generating and customizing MCP servers from OpenAPI specs and FastAPI apps, including popular requests like mechanisms for determining what routes map to what MCP components; renaming routes; and customizing the generated MCP components.

### [​](#new-features--28) New Features 🎉

- Add FastMCP 1.0 server support for in-memory Client / Testing by [@jlowin](https://github.com/jlowin) in [#539](https://github.com/PrefectHQ/fastmcp/pull/539)
- Minor addition: add transport to stdio server in mcpconfig, with default by [@jlowin](https://github.com/jlowin) in [#555](https://github.com/PrefectHQ/fastmcp/pull/555)
- Raise an error if a Client is created with no servers in config by [@jlowin](https://github.com/jlowin) in [#554](https://github.com/PrefectHQ/fastmcp/pull/554)
- Expose model preferences in `Context.sample` for flexible model selection. by [@davenpi](https://github.com/davenpi) in [#542](https://github.com/PrefectHQ/fastmcp/pull/542)
- Ensure custom routes are respected by [@jlowin](https://github.com/jlowin) in [#558](https://github.com/PrefectHQ/fastmcp/pull/558)
- Add client method to send cancellation notifications by [@davenpi](https://github.com/davenpi) in [#563](https://github.com/PrefectHQ/fastmcp/pull/563)
- Enhance route map logic for include/exclude OpenAPI routes by [@jlowin](https://github.com/jlowin) in [#564](https://github.com/PrefectHQ/fastmcp/pull/564)
- Add tag-based route maps by [@jlowin](https://github.com/jlowin) in [#565](https://github.com/PrefectHQ/fastmcp/pull/565)
- Add advanced control of openAPI route creation by [@jlowin](https://github.com/jlowin) in [#566](https://github.com/PrefectHQ/fastmcp/pull/566)
- Make error masking configurable by [@jlowin](https://github.com/jlowin) in [#550](https://github.com/PrefectHQ/fastmcp/pull/550)
- Ensure client headers are passed through to remote servers by [@jlowin](https://github.com/jlowin) in [#575](https://github.com/PrefectHQ/fastmcp/pull/575)
- Use lowercase name for headers when comparing by [@jlowin](https://github.com/jlowin) in [#576](https://github.com/PrefectHQ/fastmcp/pull/576)
- Permit more flexible name generation for OpenAPI servers by [@jlowin](https://github.com/jlowin) in [#578](https://github.com/PrefectHQ/fastmcp/pull/578)
- Ensure that tools/templates/prompts are compatible with callable objects by [@jlowin](https://github.com/jlowin) in [#579](https://github.com/PrefectHQ/fastmcp/pull/579)

### [​](#docs--40) Docs 📚

- Add version badge for prefix formats by [@jlowin](https://github.com/jlowin) in [#537](https://github.com/PrefectHQ/fastmcp/pull/537)
- Add versioning note to docs by [@jlowin](https://github.com/jlowin) in [#551](https://github.com/PrefectHQ/fastmcp/pull/551)
- Bump 2.3.6 references to 2.4.0 by [@jlowin](https://github.com/jlowin) in [#567](https://github.com/PrefectHQ/fastmcp/pull/567)

**Full Changelog**: [v2.4.0…v2.5.0](https://github.com/PrefectHQ/fastmcp/compare/v2.4.0...v2.5.0)

[​](#v2-4-0)

v2.4.0

2024-05-21

## [​](#v2-4-0-config-and-conquer) [v2.4.0: Config and Conquer](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.4.0)

**Note**: this release includes a backwards-incompatible change to how resources are prefixed when mounted in composed servers. However, it is only backwards-incompatible if users were running tests or manually loading resources by prefixed key; LLMs should not have any issue discovering the new route.

### [​](#new-features--29) New Features 🎉

- Allow \* Methods and all routes as tools shortcuts by [@jlowin](https://github.com/jlowin) in [#520](https://github.com/PrefectHQ/fastmcp/pull/520)
- Improved support for config dicts by [@jlowin](https://github.com/jlowin) in [#522](https://github.com/PrefectHQ/fastmcp/pull/522)
- Support creating clients from MCP config dicts, including multi-server clients by [@jlowin](https://github.com/jlowin) in [#527](https://github.com/PrefectHQ/fastmcp/pull/527)
- Make resource prefix format configurable by [@jlowin](https://github.com/jlowin) in [#534](https://github.com/PrefectHQ/fastmcp/pull/534)

### [​](#fixes--52) Fixes 🐞

- Avoid hanging on initializing server session by [@jlowin](https://github.com/jlowin) in [#523](https://github.com/PrefectHQ/fastmcp/pull/523)

### [​](#breaking-changes--9) Breaking Changes 🛫

- Remove customizable separators; improve resource separator by [@jlowin](https://github.com/jlowin) in [#526](https://github.com/PrefectHQ/fastmcp/pull/526)

### [​](#docs--41) Docs 📚

- Improve client documentation by [@jlowin](https://github.com/jlowin) in [#517](https://github.com/PrefectHQ/fastmcp/pull/517)

### [​](#other-changes--24) Other Changes 🦾

- Ensure openapi path params are handled properly by [@jlowin](https://github.com/jlowin) in [#519](https://github.com/PrefectHQ/fastmcp/pull/519)
- better error when missing lifespan by [@zzstoatzz](https://github.com/zzstoatzz) in [#521](https://github.com/PrefectHQ/fastmcp/pull/521)

**Full Changelog**: [v2.3.5…v2.4.0](https://github.com/PrefectHQ/fastmcp/compare/v2.3.5...v2.4.0)

[​](#v2-3-5)

v2.3.5

2024-05-20

## [​](#v2-3-5-making-progress) [v2.3.5: Making Progress](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.3.5)

### [​](#new-features--30) New Features 🎉

- support messages in progress notifications by [@rickygenhealth](https://github.com/rickygenhealth) in [#471](https://github.com/PrefectHQ/fastmcp/pull/471)
- feat: Add middleware option in server.run by [@Maxi91f](https://github.com/Maxi91f) in [#475](https://github.com/PrefectHQ/fastmcp/pull/475)
- Add lifespan property to app by [@jlowin](https://github.com/jlowin) in [#483](https://github.com/PrefectHQ/fastmcp/pull/483)
- Update `fastmcp run` to work with remote servers by [@jlowin](https://github.com/jlowin) in [#491](https://github.com/PrefectHQ/fastmcp/pull/491)
- Add FastMCP.as\_proxy() by [@jlowin](https://github.com/jlowin) in [#490](https://github.com/PrefectHQ/fastmcp/pull/490)
- Infer sse transport from urls containing /sse by [@jlowin](https://github.com/jlowin) in [#512](https://github.com/PrefectHQ/fastmcp/pull/512)
- Add progress handler to client by [@jlowin](https://github.com/jlowin) in [#513](https://github.com/PrefectHQ/fastmcp/pull/513)
- Store the initialize result on the client by [@jlowin](https://github.com/jlowin) in [#509](https://github.com/PrefectHQ/fastmcp/pull/509)

### [​](#fixes--53) Fixes 🐞

- Remove patch and use upstream SSEServerTransport by [@jlowin](https://github.com/jlowin) in [#425](https://github.com/PrefectHQ/fastmcp/pull/425)

### [​](#docs--42) Docs 📚

- Update transport docs by [@jlowin](https://github.com/jlowin) in [#458](https://github.com/PrefectHQ/fastmcp/pull/458)
- update proxy docs + example by [@zzstoatzz](https://github.com/zzstoatzz) in [#460](https://github.com/PrefectHQ/fastmcp/pull/460)
- doc(asgi): Change custom route example to PlainTextResponse by [@mcw0933](https://github.com/mcw0933) in [#477](https://github.com/PrefectHQ/fastmcp/pull/477)
- Store FastMCP instance on app.state.fastmcp\_server by [@jlowin](https://github.com/jlowin) in [#489](https://github.com/PrefectHQ/fastmcp/pull/489)
- Improve AGENTS.md overview by [@jlowin](https://github.com/jlowin) in [#492](https://github.com/PrefectHQ/fastmcp/pull/492)
- Update release numbers for anticipated version by [@jlowin](https://github.com/jlowin) in [#516](https://github.com/PrefectHQ/fastmcp/pull/516)

### [​](#other-changes--25) Other Changes 🦾

- run tests on all PRs by [@jlowin](https://github.com/jlowin) in [#468](https://github.com/PrefectHQ/fastmcp/pull/468)
- add null check by [@zzstoatzz](https://github.com/zzstoatzz) in [#473](https://github.com/PrefectHQ/fastmcp/pull/473)
- strict typing for `server.py` by [@zzstoatzz](https://github.com/zzstoatzz) in [#476](https://github.com/PrefectHQ/fastmcp/pull/476)
- Doc(quickstart): Fix import statements by [@mai-nakagawa](https://github.com/mai-nakagawa) in [#479](https://github.com/PrefectHQ/fastmcp/pull/479)
- Add labeler by [@jlowin](https://github.com/jlowin) in [#484](https://github.com/PrefectHQ/fastmcp/pull/484)
- Fix flaky timeout test by increasing timeout (#474) by [@davenpi](https://github.com/davenpi) in [#486](https://github.com/PrefectHQ/fastmcp/pull/486)
- Skipping `test_permission_error` if runner is root. by [@ZiadAmerr](https://github.com/ZiadAmerr) in [#502](https://github.com/PrefectHQ/fastmcp/pull/502)
- allow passing full uvicorn config by [@zzstoatzz](https://github.com/zzstoatzz) in [#504](https://github.com/PrefectHQ/fastmcp/pull/504)
- Skip timeout tests on windows by [@jlowin](https://github.com/jlowin) in [#514](https://github.com/PrefectHQ/fastmcp/pull/514)

### [​](#new-contributors-35) New Contributors

- [@rickygenhealth](https://github.com/rickygenhealth) made their first contribution in [#471](https://github.com/PrefectHQ/fastmcp/pull/471)
- [@Maxi91f](https://github.com/Maxi91f) made their first contribution in [#475](https://github.com/PrefectHQ/fastmcp/pull/475)
- [@mcw0933](https://github.com/mcw0933) made their first contribution in [#477](https://github.com/PrefectHQ/fastmcp/pull/477)
- [@mai-nakagawa](https://github.com/mai-nakagawa) made their first contribution in [#479](https://github.com/PrefectHQ/fastmcp/pull/479)
- [@ZiadAmerr](https://github.com/ZiadAmerr) made their first contribution in [#502](https://github.com/PrefectHQ/fastmcp/pull/502)

**Full Changelog**: [v2.3.4…v2.3.5](https://github.com/PrefectHQ/fastmcp/compare/v2.3.4...v2.3.5)

[​](#v2-3-4)

v2.3.4

2024-05-15

## [​](#v2-3-4-error-today-gone-tomorrow) [v2.3.4: Error Today, Gone Tomorrow](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.3.4)

### [​](#new-features--31) New Features 🎉

- logging stack trace for easier debugging by [@jbkoh](https://github.com/jbkoh) in [#413](https://github.com/PrefectHQ/fastmcp/pull/413)
- add missing StreamableHttpTransport in client exports by [@yihuang](https://github.com/yihuang) in [#408](https://github.com/PrefectHQ/fastmcp/pull/408)
- Improve error handling for tools and resources by [@jlowin](https://github.com/jlowin) in [#434](https://github.com/PrefectHQ/fastmcp/pull/434)
- feat: add support for removing tools from server by [@davenpi](https://github.com/davenpi) in [#437](https://github.com/PrefectHQ/fastmcp/pull/437)
- Prune titles from JSONSchemas by [@jlowin](https://github.com/jlowin) in [#449](https://github.com/PrefectHQ/fastmcp/pull/449)
- Declare toolsChanged capability for stdio server. by [@davenpi](https://github.com/davenpi) in [#450](https://github.com/PrefectHQ/fastmcp/pull/450)
- Improve handling of exceptiongroups when raised in clients by [@jlowin](https://github.com/jlowin) in [#452](https://github.com/PrefectHQ/fastmcp/pull/452)
- Add timeout support to client by [@jlowin](https://github.com/jlowin) in [#455](https://github.com/PrefectHQ/fastmcp/pull/455)

### [​](#fixes--54) Fixes 🐞

- Pin to mcp 1.8.1 to resolve callback deadlocks with SHTTP by [@jlowin](https://github.com/jlowin) in [#427](https://github.com/PrefectHQ/fastmcp/pull/427)
- Add reprs for OpenAPI objects by [@jlowin](https://github.com/jlowin) in [#447](https://github.com/PrefectHQ/fastmcp/pull/447)
- Ensure openapi defs for structured objects are loaded properly by [@jlowin](https://github.com/jlowin) in [#448](https://github.com/PrefectHQ/fastmcp/pull/448)
- Ensure tests run against correct python version by [@jlowin](https://github.com/jlowin) in [#454](https://github.com/PrefectHQ/fastmcp/pull/454)
- Ensure result is only returned if a new key was found by [@jlowin](https://github.com/jlowin) in [#456](https://github.com/PrefectHQ/fastmcp/pull/456)

### [​](#docs--43) Docs 📚

- Add documentation for tool removal by [@jlowin](https://github.com/jlowin) in [#440](https://github.com/PrefectHQ/fastmcp/pull/440)

### [​](#other-changes--26) Other Changes 🦾

- Deprecate passing settings to the FastMCP instance by [@jlowin](https://github.com/jlowin) in [#424](https://github.com/PrefectHQ/fastmcp/pull/424)
- Add path prefix to test by [@jlowin](https://github.com/jlowin) in [#432](https://github.com/PrefectHQ/fastmcp/pull/432)

### [​](#new-contributors-36) New Contributors

- [@jbkoh](https://github.com/jbkoh) made their first contribution in [#413](https://github.com/PrefectHQ/fastmcp/pull/413)
- [@davenpi](https://github.com/davenpi) made their first contribution in [#437](https://github.com/PrefectHQ/fastmcp/pull/437)

**Full Changelog**: [v2.3.3…v2.3.4](https://github.com/PrefectHQ/fastmcp/compare/v2.3.3...v2.3.4)

[​](#v2-3-3)

v2.3.3

2024-05-10

## [​](#v2-3-3-sse-you-later) [v2.3.3: SSE you later](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.3.3)

This is a hotfix for a bug introduced in 2.3.2 that broke SSE servers

### [​](#fixes--55) Fixes 🐞

- Fix bug that sets message path and sse path to same value by [@jlowin](https://github.com/jlowin) in [#405](https://github.com/PrefectHQ/fastmcp/pull/405)

### [​](#docs--44) Docs 📚

- Update composition docs by [@jlowin](https://github.com/jlowin) in [#403](https://github.com/PrefectHQ/fastmcp/pull/403)

### [​](#other-changes--27) Other Changes 🦾

- Add test for no prefix when importing by [@jlowin](https://github.com/jlowin) in [#404](https://github.com/PrefectHQ/fastmcp/pull/404)

**Full Changelog**: [v2.3.2…v2.3.3](https://github.com/PrefectHQ/fastmcp/compare/v2.3.2...v2.3.3)

[​](#v2-3-2)

v2.3.2

2024-05-10

## [​](#v2-3-2-stuck-in-the-middleware-with-you) [v2.3.2: Stuck in the Middleware With You](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.3.2)

### [​](#new-features--32) New Features 🎉

- Allow users to pass middleware to starlette app constructors by [@jlowin](https://github.com/jlowin) in [#398](https://github.com/PrefectHQ/fastmcp/pull/398)
- Deprecate transport-specific methods on FastMCP server by [@jlowin](https://github.com/jlowin) in [#401](https://github.com/PrefectHQ/fastmcp/pull/401)

### [​](#docs--45) Docs 📚

- Update CLI docs by [@jlowin](https://github.com/jlowin) in [#402](https://github.com/PrefectHQ/fastmcp/pull/402)

### [​](#other-changes--28) Other Changes 🦾

- Adding 23 tests for CLI by [@didier-durand](https://github.com/didier-durand) in [#394](https://github.com/PrefectHQ/fastmcp/pull/394)

**Full Changelog**: [v2.3.1…v2.3.2](https://github.com/PrefectHQ/fastmcp/compare/v2.3.1...v2.3.2)

[​](#v2-3-1)

v2.3.1

2024-05-09

## [​](#v2-3-1-for-good-nests-sake) [v2.3.1: For Good-nests Sake](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.3.1)

This release primarily patches a long-standing bug with nested ASGI SSE servers.

### [​](#fixes--56) Fixes 🐞

- Fix tool result serialization when the tool returns a list by [@strawgate](https://github.com/strawgate) in [#379](https://github.com/PrefectHQ/fastmcp/pull/379)
- Ensure FastMCP handles nested SSE and SHTTP apps properly in ASGI frameworks by [@jlowin](https://github.com/jlowin) in [#390](https://github.com/PrefectHQ/fastmcp/pull/390)

### [​](#docs--46) Docs 📚

- Update transport docs by [@jlowin](https://github.com/jlowin) in [#377](https://github.com/PrefectHQ/fastmcp/pull/377)
- Add llms.txt to docs by [@jlowin](https://github.com/jlowin) in [#384](https://github.com/PrefectHQ/fastmcp/pull/384)
- Fixing various text typos by [@didier-durand](https://github.com/didier-durand) in [#385](https://github.com/PrefectHQ/fastmcp/pull/385)

### [​](#other-changes--29) Other Changes 🦾

- Adding a few tests to Image type by [@didier-durand](https://github.com/didier-durand) in [#387](https://github.com/PrefectHQ/fastmcp/pull/387)
- Adding tests for TimedCache by [@didier-durand](https://github.com/didier-durand) in [#388](https://github.com/PrefectHQ/fastmcp/pull/388)

### [​](#new-contributors-37) New Contributors

- [@didier-durand](https://github.com/didier-durand) made their first contribution in [#385](https://github.com/PrefectHQ/fastmcp/pull/385)

**Full Changelog**: [v2.3.0…v2.3.1](https://github.com/PrefectHQ/fastmcp/compare/v2.3.0...v2.3.1)

[​](#v2-3-0)

v2.3.0

2024-05-08

## [​](#v2-3-0-stream-me-up-scotty) [v2.3.0: Stream Me Up, Scotty](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.3.0)

### [​](#new-features--33) New Features 🎉

- Add streaming support for HTTP transport by [@jlowin](https://github.com/jlowin) in [#365](https://github.com/PrefectHQ/fastmcp/pull/365)
- Support streaming HTTP transport in clients by [@jlowin](https://github.com/jlowin) in [#366](https://github.com/PrefectHQ/fastmcp/pull/366)
- Add streaming support to CLI by [@jlowin](https://github.com/jlowin) in [#367](https://github.com/PrefectHQ/fastmcp/pull/367)

### [​](#fixes--57) Fixes 🐞

- Fix streaming transport initialization by [@jlowin](https://github.com/jlowin) in [#368](https://github.com/PrefectHQ/fastmcp/pull/368)

### [​](#docs--47) Docs 📚

- Update transport documentation for streaming support by [@jlowin](https://github.com/jlowin) in [#369](https://github.com/PrefectHQ/fastmcp/pull/369)

**Full Changelog**: [v2.2.10…v2.3.0](https://github.com/PrefectHQ/fastmcp/compare/v2.2.10...v2.3.0)

[​](#v2-2-10)

v2.2.10

2024-05-06

## [​](#v2-2-10-that’s-json-bourne) [v2.2.10: That’s JSON Bourne](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.2.10)

### [​](#fixes--58) Fixes 🐞

- Disable automatic JSON parsing of tool args by [@jlowin](https://github.com/jlowin) in [#341](https://github.com/PrefectHQ/fastmcp/pull/341)
- Fix prompt test by [@jlowin](https://github.com/jlowin) in [#342](https://github.com/PrefectHQ/fastmcp/pull/342)

### [​](#other-changes--30) Other Changes 🦾

- Update docs.json by [@jlowin](https://github.com/jlowin) in [#338](https://github.com/PrefectHQ/fastmcp/pull/338)
- Add test coverage + tests on 4 examples by [@alainivars](https://github.com/alainivars) in [#306](https://github.com/PrefectHQ/fastmcp/pull/306)

### [​](#new-contributors-38) New Contributors

- [@alainivars](https://github.com/alainivars) made their first contribution in [#306](https://github.com/PrefectHQ/fastmcp/pull/306)

**Full Changelog**: [v2.2.9…v2.2.10](https://github.com/PrefectHQ/fastmcp/compare/v2.2.9...v2.2.10)

[​](#v2-2-9)

v2.2.9

2024-05-06

## [​](#v2-2-9-str-ing-the-pot-hotfix) [v2.2.9: Str-ing the Pot (Hotfix)](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.2.9)

This release is a hotfix for the issue detailed in #330

### [​](#fixes--59) Fixes 🐞

- Prevent invalid resource URIs by [@jlowin](https://github.com/jlowin) in [#336](https://github.com/PrefectHQ/fastmcp/pull/336)
- Coerce numbers to str by [@jlowin](https://github.com/jlowin) in [#337](https://github.com/PrefectHQ/fastmcp/pull/337)

### [​](#docs--48) Docs 📚

- Add client badge by [@jlowin](https://github.com/jlowin) in [#327](https://github.com/PrefectHQ/fastmcp/pull/327)
- Update bug.yml by [@jlowin](https://github.com/jlowin) in [#328](https://github.com/PrefectHQ/fastmcp/pull/328)

### [​](#other-changes--31) Other Changes 🦾

- Update quickstart.mdx example to include import by [@discdiver](https://github.com/discdiver) in [#329](https://github.com/PrefectHQ/fastmcp/pull/329)

### [​](#new-contributors-39) New Contributors

- [@discdiver](https://github.com/discdiver) made their first contribution in [#329](https://github.com/PrefectHQ/fastmcp/pull/329)

**Full Changelog**: [v2.2.8…v2.2.9](https://github.com/PrefectHQ/fastmcp/compare/v2.2.8...v2.2.9)

[​](#v2-2-8)

v2.2.8

2024-05-05

## [​](#v2-2-8-parse-and-recreation) [v2.2.8: Parse and Recreation](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.2.8)

### [​](#new-features--34) New Features 🎉

- Replace custom parsing with TypeAdapter by [@jlowin](https://github.com/jlowin) in [#314](https://github.com/PrefectHQ/fastmcp/pull/314)
- Handle \*args/\*\*kwargs appropriately for various components by [@jlowin](https://github.com/jlowin) in [#317](https://github.com/PrefectHQ/fastmcp/pull/317)
- Add timeout-graceful-shutdown as a default config for SSE app by [@jlowin](https://github.com/jlowin) in [#323](https://github.com/PrefectHQ/fastmcp/pull/323)
- Ensure prompts return descriptions by [@jlowin](https://github.com/jlowin) in [#325](https://github.com/PrefectHQ/fastmcp/pull/325)

### [​](#fixes--60) Fixes 🐞

- Ensure that tool serialization has a graceful fallback by [@jlowin](https://github.com/jlowin) in [#310](https://github.com/PrefectHQ/fastmcp/pull/310)

### [​](#docs--49) Docs 📚

- Update docs for clarity by [@jlowin](https://github.com/jlowin) in [#312](https://github.com/PrefectHQ/fastmcp/pull/312)

### [​](#other-changes--32) Other Changes 🦾

- Remove is\_async attribute by [@jlowin](https://github.com/jlowin) in [#315](https://github.com/PrefectHQ/fastmcp/pull/315)
- Dry out retrieving context kwarg by [@jlowin](https://github.com/jlowin) in [#316](https://github.com/PrefectHQ/fastmcp/pull/316)

**Full Changelog**: [v2.2.7…v2.2.8](https://github.com/PrefectHQ/fastmcp/compare/v2.2.7...v2.2.8)

[​](#v2-2-7)

v2.2.7

2024-05-03

## [​](#v2-2-7-you-auth-to-know-better) [v2.2.7: You Auth to Know Better](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.2.7)

### [​](#new-features--35) New Features 🎉

- use pydantic\_core.to\_json by [@jlowin](https://github.com/jlowin) in [#290](https://github.com/PrefectHQ/fastmcp/pull/290)
- Ensure openapi descriptions are included in tool details by [@jlowin](https://github.com/jlowin) in [#293](https://github.com/PrefectHQ/fastmcp/pull/293)
- Bump mcp to 1.7.1 by [@jlowin](https://github.com/jlowin) in [#298](https://github.com/PrefectHQ/fastmcp/pull/298)
- Add support for tool annotations by [@jlowin](https://github.com/jlowin) in [#299](https://github.com/PrefectHQ/fastmcp/pull/299)
- Add auth support by [@jlowin](https://github.com/jlowin) in [#300](https://github.com/PrefectHQ/fastmcp/pull/300)
- Add low-level methods to client by [@jlowin](https://github.com/jlowin) in [#301](https://github.com/PrefectHQ/fastmcp/pull/301)
- Add method for retrieving current starlette request to FastMCP context by [@jlowin](https://github.com/jlowin) in [#302](https://github.com/PrefectHQ/fastmcp/pull/302)
- get\_starlette\_request → get\_http\_request by [@jlowin](https://github.com/jlowin) in [#303](https://github.com/PrefectHQ/fastmcp/pull/303)
- Support custom Serializer for Tools by [@strawgate](https://github.com/strawgate) in [#308](https://github.com/PrefectHQ/fastmcp/pull/308)
- Support proxy mount by [@jlowin](https://github.com/jlowin) in [#309](https://github.com/PrefectHQ/fastmcp/pull/309)

### [​](#other-changes--33) Other Changes 🦾

- Improve context injection type checks by [@jlowin](https://github.com/jlowin) in [#291](https://github.com/PrefectHQ/fastmcp/pull/291)
- add readme to smarthome example by [@zzstoatzz](https://github.com/zzstoatzz) in [#294](https://github.com/PrefectHQ/fastmcp/pull/294)

**Full Changelog**: [v2.2.6…v2.2.7](https://github.com/PrefectHQ/fastmcp/compare/v2.2.6...v2.2.7)

[​](#v2-2-6)

v2.2.6

2024-04-30

## [​](#v2-2-6-the-rest-is-history) [v2.2.6: The REST is History](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.2.6)

### [​](#new-features--36) New Features 🎉

- Added feature : Load MCP server using config by [@sandipan1](https://github.com/sandipan1) in [#260](https://github.com/PrefectHQ/fastmcp/pull/260)
- small typing fixes by [@zzstoatzz](https://github.com/zzstoatzz) in [#237](https://github.com/PrefectHQ/fastmcp/pull/237)
- Expose configurable timeout for OpenAPI by [@jlowin](https://github.com/jlowin) in [#279](https://github.com/PrefectHQ/fastmcp/pull/279)
- Lower websockets pin for compatibility by [@jlowin](https://github.com/jlowin) in [#286](https://github.com/PrefectHQ/fastmcp/pull/286)
- Improve OpenAPI param handling by [@jlowin](https://github.com/jlowin) in [#287](https://github.com/PrefectHQ/fastmcp/pull/287)

### [​](#fixes--61) Fixes 🐞

- Ensure openapi tool responses are properly converted by [@jlowin](https://github.com/jlowin) in [#283](https://github.com/PrefectHQ/fastmcp/pull/283)
- Fix OpenAPI examples by [@jlowin](https://github.com/jlowin) in [#285](https://github.com/PrefectHQ/fastmcp/pull/285)
- Fix client docs for advanced features, add tests for logging by [@jlowin](https://github.com/jlowin) in [#284](https://github.com/PrefectHQ/fastmcp/pull/284)

### [​](#other-changes--34) Other Changes 🦾

- add testing doc by [@jlowin](https://github.com/jlowin) in [#264](https://github.com/PrefectHQ/fastmcp/pull/264)
- #267 Fix openapi template resource to support multiple path parameters by [@jeger-at](https://github.com/jeger-at) in [#278](https://github.com/PrefectHQ/fastmcp/pull/278)

### [​](#new-contributors-40) New Contributors

- [@sandipan1](https://github.com/sandipan1) made their first contribution in [#260](https://github.com/PrefectHQ/fastmcp/pull/260)
- [@jeger-at](https://github.com/jeger-at) made their first contribution in [#278](https://github.com/PrefectHQ/fastmcp/pull/278)

**Full Changelog**: [v2.2.5…v2.2.6](https://github.com/PrefectHQ/fastmcp/compare/v2.2.5...v2.2.6)

[​](#v2-2-5)

v2.2.5

2024-04-26

## [​](#v2-2-5-context-switching) [v2.2.5: Context Switching](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.2.5)

### [​](#new-features--37) New Features 🎉

- Add tests for tool return types; improve serialization behavior by [@jlowin](https://github.com/jlowin) in [#262](https://github.com/PrefectHQ/fastmcp/pull/262)
- Support context injection in resources, templates, and prompts (like tools) by [@jlowin](https://github.com/jlowin) in [#263](https://github.com/PrefectHQ/fastmcp/pull/263)

### [​](#docs--50) Docs 📚

- Update wildcards to 2.2.4 by [@jlowin](https://github.com/jlowin) in [#257](https://github.com/PrefectHQ/fastmcp/pull/257)
- Update note in templates docs by [@jlowin](https://github.com/jlowin) in [#258](https://github.com/PrefectHQ/fastmcp/pull/258)
- Significant documentation and test expansion for tool input types by [@jlowin](https://github.com/jlowin) in [#261](https://github.com/PrefectHQ/fastmcp/pull/261)

**Full Changelog**: [v2.2.4…v2.2.5](https://github.com/PrefectHQ/fastmcp/compare/v2.2.4...v2.2.5)

[​](#v2-2-4)

v2.2.4

2024-04-25

## [​](#v2-2-4-the-wild-side-actually) [v2.2.4: The Wild Side, Actually](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.2.4)

The wildcard URI templates exposed in v2.2.3 were blocked by a server-level check which is removed in this release.

### [​](#new-features--38) New Features 🎉

- Allow customization of inspector proxy port, ui port, and version by [@jlowin](https://github.com/jlowin) in [#253](https://github.com/PrefectHQ/fastmcp/pull/253)

### [​](#fixes--62) Fixes 🐞

- fix: unintended type convert by [@cutekibry](https://github.com/cutekibry) in [#252](https://github.com/PrefectHQ/fastmcp/pull/252)
- Ensure openapi resources return valid responses by [@jlowin](https://github.com/jlowin) in [#254](https://github.com/PrefectHQ/fastmcp/pull/254)
- Ensure servers expose template wildcards by [@jlowin](https://github.com/jlowin) in [#256](https://github.com/PrefectHQ/fastmcp/pull/256)

### [​](#docs--51) Docs 📚

- Update README.md Grammar error by [@TechWithTy](https://github.com/TechWithTy) in [#249](https://github.com/PrefectHQ/fastmcp/pull/249)

### [​](#other-changes--35) Other Changes 🦾

- Add resource template tests by [@jlowin](https://github.com/jlowin) in [#255](https://github.com/PrefectHQ/fastmcp/pull/255)

### [​](#new-contributors-41) New Contributors

- [@TechWithTy](https://github.com/TechWithTy) made their first contribution in [#249](https://github.com/PrefectHQ/fastmcp/pull/249)
- [@cutekibry](https://github.com/cutekibry) made their first contribution in [#252](https://github.com/PrefectHQ/fastmcp/pull/252)

**Full Changelog**: [v2.2.3…v2.2.4](https://github.com/PrefectHQ/fastmcp/compare/v2.2.3...v2.2.4)

[​](#v2-2-3)

v2.2.3

2024-04-25

## [​](#v2-2-3-the-wild-side) [v2.2.3: The Wild Side](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.2.3)

### [​](#new-features--39) New Features 🎉

- Add wildcard params for resource templates by [@jlowin](https://github.com/jlowin) in [#246](https://github.com/PrefectHQ/fastmcp/pull/246)

### [​](#docs--52) Docs 📚

- Indicate that Image class is for returns by [@jlowin](https://github.com/jlowin) in [#242](https://github.com/PrefectHQ/fastmcp/pull/242)
- Update mermaid diagram by [@jlowin](https://github.com/jlowin) in [#243](https://github.com/PrefectHQ/fastmcp/pull/243)

### [​](#other-changes--36) Other Changes 🦾

- update version badges by [@jlowin](https://github.com/jlowin) in [#248](https://github.com/PrefectHQ/fastmcp/pull/248)

**Full Changelog**: [v2.2.2…v2.2.3](https://github.com/PrefectHQ/fastmcp/compare/v2.2.2...v2.2.3)

[​](#v2-2-2)

v2.2.2

2024-04-24

## [​](#v2-2-2-prompt-and-circumstance) [v2.2.2: Prompt and Circumstance](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.2.2)

### [​](#new-features--40) New Features 🎉

- Add prompt support by [@jlowin](https://github.com/jlowin) in [#235](https://github.com/PrefectHQ/fastmcp/pull/235)

### [​](#fixes--63) Fixes 🐞

- Ensure that resource templates are properly exposed by [@jlowin](https://github.com/jlowin) in [#238](https://github.com/PrefectHQ/fastmcp/pull/238)

### [​](#docs--53) Docs 📚

- Update docs for prompts by [@jlowin](https://github.com/jlowin) in [#236](https://github.com/PrefectHQ/fastmcp/pull/236)

### [​](#other-changes--37) Other Changes 🦾

- Add prompt tests by [@jlowin](https://github.com/jlowin) in [#239](https://github.com/PrefectHQ/fastmcp/pull/239)

**Full Changelog**: [v2.2.1…v2.2.2](https://github.com/PrefectHQ/fastmcp/compare/v2.2.1...v2.2.2)

[​](#v2-2-1)

v2.2.1

2024-04-23

## [​](#v2-2-1-template-for-success) [v2.2.1: Template for Success](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.2.1)

### [​](#new-features--41) New Features 🎉

- Add resource templates by [@jlowin](https://github.com/jlowin) in [#230](https://github.com/PrefectHQ/fastmcp/pull/230)

### [​](#fixes--64) Fixes 🐞

- Ensure that resource templates are properly exposed by [@jlowin](https://github.com/jlowin) in [#231](https://github.com/PrefectHQ/fastmcp/pull/231)

### [​](#docs--54) Docs 📚

- Update docs for resource templates by [@jlowin](https://github.com/jlowin) in [#232](https://github.com/PrefectHQ/fastmcp/pull/232)

### [​](#other-changes--38) Other Changes 🦾

- Add resource template tests by [@jlowin](https://github.com/jlowin) in [#233](https://github.com/PrefectHQ/fastmcp/pull/233)

**Full Changelog**: [v2.2.0…v2.2.1](https://github.com/PrefectHQ/fastmcp/compare/v2.2.0...v2.2.1)

[​](#v2-2-0)

v2.2.0

2024-04-22

## [​](#v2-2-0-compose-yourself) [v2.2.0: Compose Yourself](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.2.0)

### [​](#new-features--42) New Features 🎉

- Add support for mounting FastMCP servers by [@jlowin](https://github.com/jlowin) in [#175](https://github.com/PrefectHQ/fastmcp/pull/175)
- Add support for duplicate behavior == ignore by [@jlowin](https://github.com/jlowin) in [#169](https://github.com/PrefectHQ/fastmcp/pull/169)

### [​](#breaking-changes--10) Breaking Changes 🛫

- Refactor MCP composition by [@jlowin](https://github.com/jlowin) in [#176](https://github.com/PrefectHQ/fastmcp/pull/176)

### [​](#docs--55) Docs 📚

- Improve integration documentation by [@jlowin](https://github.com/jlowin) in [#184](https://github.com/PrefectHQ/fastmcp/pull/184)
- Improve documentation by [@jlowin](https://github.com/jlowin) in [#185](https://github.com/PrefectHQ/fastmcp/pull/185)

### [​](#other-changes--39) Other Changes 🦾

- Add transport kwargs for mcp.run() and fastmcp run by [@jlowin](https://github.com/jlowin) in [#161](https://github.com/PrefectHQ/fastmcp/pull/161)
- Allow resource templates to have optional / excluded arguments by [@jlowin](https://github.com/jlowin) in [#164](https://github.com/PrefectHQ/fastmcp/pull/164)
- Update resources.mdx by [@jlowin](https://github.com/jlowin) in [#165](https://github.com/PrefectHQ/fastmcp/pull/165)

### [​](#new-contributors-42) New Contributors

- [@kongqi404](https://github.com/kongqi404) made their first contribution in [#181](https://github.com/PrefectHQ/fastmcp/pull/181)

**Full Changelog**: [v2.1.2…v2.2.0](https://github.com/PrefectHQ/fastmcp/compare/v2.1.2...v2.2.0)

[​](#v2-1-2)

v2.1.2

2024-04-14

## [​](#v2-1-2-copy-that-good-buddy) [v2.1.2: Copy That, Good Buddy](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.1.2)

The main improvement in this release is a fix that allows FastAPI / OpenAPI-generated servers to be mounted as sub-servers.

### [​](#fixes--65) Fixes 🐞

- Ensure objects are copied properly and test mounting fastapi by [@jlowin](https://github.com/jlowin) in [#153](https://github.com/PrefectHQ/fastmcp/pull/153)

### [​](#docs--56) Docs 📚

- Fix broken links in docs by [@jlowin](https://github.com/jlowin) in [#154](https://github.com/PrefectHQ/fastmcp/pull/154)

### [​](#other-changes--40) Other Changes 🦾

- Update README.md by [@jlowin](https://github.com/jlowin) in [#149](https://github.com/PrefectHQ/fastmcp/pull/149)
- Only apply log config to FastMCP loggers by [@jlowin](https://github.com/jlowin) in [#155](https://github.com/PrefectHQ/fastmcp/pull/155)
- Update pyproject.toml by [@jlowin](https://github.com/jlowin) in [#156](https://github.com/PrefectHQ/fastmcp/pull/156)

**Full Changelog**: [v2.1.1…v2.1.2](https://github.com/PrefectHQ/fastmcp/compare/v2.1.1...v2.1.2)

[​](#v2-1-1)

v2.1.1

2024-04-14

## [​](#v2-1-1-doc-holiday) [v2.1.1: Doc Holiday](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.1.1)

FastMCP’s docs are now available at gofastmcp.com.

### [​](#docs--57) Docs 📚

- Add docs by [@jlowin](https://github.com/jlowin) in [#136](https://github.com/PrefectHQ/fastmcp/pull/136)
- Add docs link to readme by [@jlowin](https://github.com/jlowin) in [#137](https://github.com/PrefectHQ/fastmcp/pull/137)
- Minor docs updates by [@jlowin](https://github.com/jlowin) in [#138](https://github.com/PrefectHQ/fastmcp/pull/138)

### [​](#fixes--66) Fixes 🐞

- fix branch name in example by [@zzstoatzz](https://github.com/zzstoatzz) in [#140](https://github.com/PrefectHQ/fastmcp/pull/140)

### [​](#other-changes--41) Other Changes 🦾

- smart home example by [@zzstoatzz](https://github.com/zzstoatzz) in [#115](https://github.com/PrefectHQ/fastmcp/pull/115)
- Remove mac os tests by [@jlowin](https://github.com/jlowin) in [#142](https://github.com/PrefectHQ/fastmcp/pull/142)
- Expand support for various method interactions by [@jlowin](https://github.com/jlowin) in [#143](https://github.com/PrefectHQ/fastmcp/pull/143)
- Update docs and add\_resource\_fn by [@jlowin](https://github.com/jlowin) in [#144](https://github.com/PrefectHQ/fastmcp/pull/144)
- Update description by [@jlowin](https://github.com/jlowin) in [#145](https://github.com/PrefectHQ/fastmcp/pull/145)
- Support openapi 3.0 and 3.1 by [@jlowin](https://github.com/jlowin) in [#147](https://github.com/PrefectHQ/fastmcp/pull/147)

**Full Changelog**: [v2.1.0…v2.1.1](https://github.com/PrefectHQ/fastmcp/compare/v2.1.0...v2.1.1)

[​](#v2-1-0)

v2.1.0

2024-04-13

## [​](#v2-1-0-tag-you’re-it) [v2.1.0: Tag, You’re It](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.1.0)

The primary motivation for this release is the fix in #128 for Claude desktop compatibility, but the primary new feature of this release is per-object tags. Currently these are for bookkeeping only but will become useful in future releases.

### [​](#new-features--43) New Features 🎉

- Add tags for all core MCP objects by [@jlowin](https://github.com/jlowin) in [#121](https://github.com/PrefectHQ/fastmcp/pull/121)
- Ensure that openapi tags are transferred to MCP objects by [@jlowin](https://github.com/jlowin) in [#124](https://github.com/PrefectHQ/fastmcp/pull/124)

### [​](#fixes--67) Fixes 🐞

- Change default mounted tool separator from / to \_ by [@jlowin](https://github.com/jlowin) in [#128](https://github.com/PrefectHQ/fastmcp/pull/128)
- Enter mounted app lifespans by [@jlowin](https://github.com/jlowin) in [#129](https://github.com/PrefectHQ/fastmcp/pull/129)
- Fix CLI that called mcp instead of fastmcp by [@jlowin](https://github.com/jlowin) in [#128](https://github.com/PrefectHQ/fastmcp/pull/128)

### [​](#breaking-changes--11) Breaking Changes 🛫

- Changed configuration for duplicate resources/tools/prompts by [@jlowin](https://github.com/jlowin) in [#121](https://github.com/PrefectHQ/fastmcp/pull/121)
- Improve client return types by [@jlowin](https://github.com/jlowin) in [#123](https://github.com/PrefectHQ/fastmcp/pull/123)

### [​](#other-changes--42) Other Changes 🦾

- Add tests for tags in server decorators by [@jlowin](https://github.com/jlowin) in [#122](https://github.com/PrefectHQ/fastmcp/pull/122)
- Clean up server tests by [@jlowin](https://github.com/jlowin) in [#125](https://github.com/PrefectHQ/fastmcp/pull/125)

**Full Changelog**: [v2.0.0…v2.1.0](https://github.com/PrefectHQ/fastmcp/compare/v2.0.0...v2.1.0)

[​](#v2-0-0)

v2.0.0

2024-04-11

## [​](#v2-0-0-second-to-none) [v2.0.0: Second to None](https://github.com/PrefectHQ/fastmcp/releases/tag/v2.0.0)

### [​](#new-features--44) New Features 🎉

- Support mounting FastMCP instances as sub-MCPs by [@jlowin](https://github.com/jlowin) in [#99](https://github.com/PrefectHQ/fastmcp/pull/99)
- Add in-memory client for calling FastMCP servers (and tests) by [@jlowin](https://github.com/jlowin) in [#100](https://github.com/PrefectHQ/fastmcp/pull/100)
- Add MCP proxy server by [@jlowin](https://github.com/jlowin) in [#105](https://github.com/PrefectHQ/fastmcp/pull/105)
- Update FastMCP for upstream changes by [@jlowin](https://github.com/jlowin) in [#107](https://github.com/PrefectHQ/fastmcp/pull/107)
- Generate FastMCP servers from OpenAPI specs and FastAPI by [@jlowin](https://github.com/jlowin) in [#110](https://github.com/PrefectHQ/fastmcp/pull/110)
- Reorganize all client / transports by [@jlowin](https://github.com/jlowin) in [#111](https://github.com/PrefectHQ/fastmcp/pull/111)
- Add sampling and roots by [@jlowin](https://github.com/jlowin) in [#117](https://github.com/PrefectHQ/fastmcp/pull/117)

### [​](#fixes--68) Fixes 🐞

- Fix bug with tools that return lists by [@jlowin](https://github.com/jlowin) in [#116](https://github.com/PrefectHQ/fastmcp/pull/116)

### [​](#other-changes--43) Other Changes 🦾

- Add back FastMCP CLI by [@jlowin](https://github.com/jlowin) in [#108](https://github.com/PrefectHQ/fastmcp/pull/108)
- Update Readme for v2 by [@jlowin](https://github.com/jlowin) in [#112](https://github.com/PrefectHQ/fastmcp/pull/112)
- fix deprecation warnings by [@zzstoatzz](https://github.com/zzstoatzz) in [#113](https://github.com/PrefectHQ/fastmcp/pull/113)
- Readme by [@jlowin](https://github.com/jlowin) in [#118](https://github.com/PrefectHQ/fastmcp/pull/118)
- FastMCP 2.0 by [@jlowin](https://github.com/jlowin) in [#119](https://github.com/PrefectHQ/fastmcp/pull/119)

**Full Changelog**: [v1.0…v2.0.0](https://github.com/PrefectHQ/fastmcp/compare/v1.0...v2.0.0)

[​](#v1-0)

v1.0

2024-04-11

## [​](#v1-0-it’s-official) [v1.0: It’s Official](https://github.com/PrefectHQ/fastmcp/releases/tag/v1.0)

This release commemorates FastMCP 1.0, which is included in the official Model Context Protocol SDK:

from mcp.server.fastmcp import FastMCP

To the best of my knowledge, v1 is identical to the upstream version included with `mcp`.

### [​](#docs--58) Docs 📚

- Update readme to redirect to the official SDK by [@jlowin](https://github.com/jlowin) in [#79](https://github.com/PrefectHQ/fastmcp/pull/79)

### [​](#other-changes--44) Other Changes 🦾

- fix: use Mount instead of Route for SSE message handling by [@samihamine](https://github.com/samihamine) in [#77](https://github.com/PrefectHQ/fastmcp/pull/77)

### [​](#new-contributors-43) New Contributors

- [@samihamine](https://github.com/samihamine) made their first contribution in [#77](https://github.com/PrefectHQ/fastmcp/pull/77)

**Full Changelog**: [v0.4.1…v1.0](https://github.com/PrefectHQ/fastmcp/compare/v0.4.1...v1.0)

[​](#v0-4-1)

v0.4.1

2024-12-09

## [​](#v0-4-1-string-theory) [v0.4.1: String Theory](https://github.com/PrefectHQ/fastmcp/releases/tag/v0.4.1)

### [​](#fixes--69) Fixes 🐞

- fix: handle strings containing numbers correctly by [@sd2k](https://github.com/sd2k) in [#63](https://github.com/PrefectHQ/fastmcp/pull/63)

### [​](#docs--59) Docs 📚

- patch: Update pyproject.toml license by [@leonkozlowski](https://github.com/leonkozlowski) in [#67](https://github.com/PrefectHQ/fastmcp/pull/67)

### [​](#other-changes--45) Other Changes 🦾

- Avoid new try\_eval\_type unavailable with older pydantic by [@jurasofish](https://github.com/jurasofish) in [#57](https://github.com/PrefectHQ/fastmcp/pull/57)
- Decorator typing by [@jurasofish](https://github.com/jurasofish) in [#56](https://github.com/PrefectHQ/fastmcp/pull/56)

### [​](#new-contributors-44) New Contributors

- [@leonkozlowski](https://github.com/leonkozlowski) made their first contribution in [#67](https://github.com/PrefectHQ/fastmcp/pull/67)

**Full Changelog**: [v0.4.0…v0.4.1](https://github.com/PrefectHQ/fastmcp/compare/v0.4.0...v0.4.1)

[​](#v0-4-0)

v0.4.0

2024-12-05

## [​](#v0-4-0-nice-to-mit-you) [v0.4.0: Nice to MIT You](https://github.com/PrefectHQ/fastmcp/releases/tag/v0.4.0)

This is a relatively small release in terms of features, but the version is bumped to 0.4 to reflect that the code is being relicensed from Apache 2.0 to MIT. This is to facilitate FastMCP’s inclusion in the official MCP SDK.

### [​](#new-features--45) New Features 🎉

- Add pyright + tests by [@jlowin](https://github.com/jlowin) in [#52](https://github.com/PrefectHQ/fastmcp/pull/52)
- add pgvector memory example by [@zzstoatzz](https://github.com/zzstoatzz) in [#49](https://github.com/PrefectHQ/fastmcp/pull/49)

### [​](#fixes--70) Fixes 🐞

- fix: use stderr for logging by [@sd2k](https://github.com/sd2k) in [#51](https://github.com/PrefectHQ/fastmcp/pull/51)

### [​](#docs--60) Docs 📚

- Update ai-labeler.yml by [@jlowin](https://github.com/jlowin) in [#48](https://github.com/PrefectHQ/fastmcp/pull/48)
- Relicense from Apache 2.0 to MIT by [@jlowin](https://github.com/jlowin) in [#54](https://github.com/PrefectHQ/fastmcp/pull/54)

### [​](#other-changes--46) Other Changes 🦾

- fix warning and flake by [@zzstoatzz](https://github.com/zzstoatzz) in [#47](https://github.com/PrefectHQ/fastmcp/pull/47)

### [​](#new-contributors-45) New Contributors

- [@sd2k](https://github.com/sd2k) made their first contribution in [#51](https://github.com/PrefectHQ/fastmcp/pull/51)

**Full Changelog**: [v0.3.5…v0.4.0](https://github.com/PrefectHQ/fastmcp/compare/v0.3.5...v0.4.0)

[​](#v0-3-5)

v0.3.5

2024-12-03

## [​](#v0-3-5-windows-of-opportunity) [v0.3.5: Windows of Opportunity](https://github.com/PrefectHQ/fastmcp/releases/tag/v0.3.5)

This release is highlighted by the ability to handle complex JSON objects as MCP inputs and improved Windows compatibility.

### [​](#new-features--46) New Features 🎉

- Set up multiple os tests by [@jlowin](https://github.com/jlowin) in [#44](https://github.com/PrefectHQ/fastmcp/pull/44)
- Changes to accommodate windows users. by [@justjoehere](https://github.com/justjoehere) in [#42](https://github.com/PrefectHQ/fastmcp/pull/42)
- Handle complex inputs by [@jurasofish](https://github.com/jurasofish) in [#31](https://github.com/PrefectHQ/fastmcp/pull/31)

### [​](#docs--61) Docs 📚

- Make AI labeler more conservative by [@jlowin](https://github.com/jlowin) in [#46](https://github.com/PrefectHQ/fastmcp/pull/46)

### [​](#other-changes--47) Other Changes 🦾

- Additional Windows Fixes for Dev running and for importing modules in a server by [@justjoehere](https://github.com/justjoehere) in [#43](https://github.com/PrefectHQ/fastmcp/pull/43)

### [​](#new-contributors-46) New Contributors

- [@justjoehere](https://github.com/justjoehere) made their first contribution in [#42](https://github.com/PrefectHQ/fastmcp/pull/42)
- [@jurasofish](https://github.com/jurasofish) made their first contribution in [#31](https://github.com/PrefectHQ/fastmcp/pull/31)

**Full Changelog**: [v0.3.4…v0.3.5](https://github.com/PrefectHQ/fastmcp/compare/v0.3.4...v0.3.5)

[​](#v0-3-4)

v0.3.4

2024-12-02

## [​](#v0-3-4-url’s-well-that-ends-well) [v0.3.4: URL’s Well That Ends Well](https://github.com/PrefectHQ/fastmcp/releases/tag/v0.3.4)

### [​](#fixes--71) Fixes 🐞

- Handle missing config file when installing by [@jlowin](https://github.com/jlowin) in [#37](https://github.com/PrefectHQ/fastmcp/pull/37)
- Remove BaseURL reference and use AnyURL by [@jlowin](https://github.com/jlowin) in [#40](https://github.com/PrefectHQ/fastmcp/pull/40)

**Full Changelog**: [v0.3.3…v0.3.4](https://github.com/PrefectHQ/fastmcp/compare/v0.3.3...v0.3.4)

[​](#v0-3-3)

v0.3.3

2024-12-02

## [​](#v0-3-3-dependence-day) [v0.3.3: Dependence Day](https://github.com/PrefectHQ/fastmcp/releases/tag/v0.3.3)

### [​](#new-features--47) New Features 🎉

- Surge example by [@zzstoatzz](https://github.com/zzstoatzz) in [#29](https://github.com/PrefectHQ/fastmcp/pull/29)
- Support Python dependencies in Server by [@jlowin](https://github.com/jlowin) in [#34](https://github.com/PrefectHQ/fastmcp/pull/34)

### [​](#docs--62) Docs 📚

- add `Contributing` section to README by [@zzstoatzz](https://github.com/zzstoatzz) in [#32](https://github.com/PrefectHQ/fastmcp/pull/32)

**Full Changelog**: [v0.3.2…v0.3.3](https://github.com/PrefectHQ/fastmcp/compare/v0.3.2...v0.3.3)

[​](#v0-3-2)

v0.3.2

Green with ENVy

## [​](#v0-3-2-green-with-envy) [v0.3.2: Green with ENVy](https://github.com/PrefectHQ/fastmcp/releases/tag/v0.3.2)

### [​](#new-features--48) New Features 🎉

- Support env vars when installing by [@jlowin](https://github.com/jlowin) in [#27](https://github.com/PrefectHQ/fastmcp/pull/27)

### [​](#docs--63) Docs 📚

- Remove top level env var by [@jlowin](https://github.com/jlowin) in [#28](https://github.com/PrefectHQ/fastmcp/pull/28)

**Full Changelog**: [v0.3.1…v0.3.2](https://github.com/PrefectHQ/fastmcp/compare/v0.3.1...v0.3.2)

[​](#v0-3-1)

v0.3.1

2024-12-01

## [​](#v0-3-1) [v0.3.1](https://github.com/PrefectHQ/fastmcp/releases/tag/v0.3.1)

### [​](#new-features--49) New Features 🎉

- Update README.md by [@jlowin](https://github.com/jlowin) in [#23](https://github.com/PrefectHQ/fastmcp/pull/23)
- add rich handler and dotenv loading for settings by [@zzstoatzz](https://github.com/zzstoatzz) in [#22](https://github.com/PrefectHQ/fastmcp/pull/22)
- print exception when server can’t start by [@jlowin](https://github.com/jlowin) in [#25](https://github.com/PrefectHQ/fastmcp/pull/25)

### [​](#docs--64) Docs 📚

- Update README.md by [@jlowin](https://github.com/jlowin) in [#24](https://github.com/PrefectHQ/fastmcp/pull/24)

### [​](#other-changes--48) Other Changes 🦾

- Remove log by [@jlowin](https://github.com/jlowin) in [#26](https://github.com/PrefectHQ/fastmcp/pull/26)

**Full Changelog**: [v0.3.0…v0.3.1](https://github.com/PrefectHQ/fastmcp/compare/v0.3.0...v0.3.1)

[​](#v0-3-0)

v0.3.0

2024-12-01

## [​](#v0-3-0-prompt-and-circumstance) [v0.3.0: Prompt and Circumstance](https://github.com/PrefectHQ/fastmcp/releases/tag/v0.3.0)

### [​](#new-features--50) New Features 🎉

- Update README by [@jlowin](https://github.com/jlowin) in [#3](https://github.com/PrefectHQ/fastmcp/pull/3)
- Make log levels strings by [@jlowin](https://github.com/jlowin) in [#4](https://github.com/PrefectHQ/fastmcp/pull/4)
- Make content method a function by [@jlowin](https://github.com/jlowin) in [#5](https://github.com/PrefectHQ/fastmcp/pull/5)
- Add template support by [@jlowin](https://github.com/jlowin) in [#6](https://github.com/PrefectHQ/fastmcp/pull/6)
- Refactor resources module by [@jlowin](https://github.com/jlowin) in [#7](https://github.com/PrefectHQ/fastmcp/pull/7)
- Clean up cli imports by [@jlowin](https://github.com/jlowin) in [#8](https://github.com/PrefectHQ/fastmcp/pull/8)
- Prepare to list templates by [@jlowin](https://github.com/jlowin) in [#11](https://github.com/PrefectHQ/fastmcp/pull/11)
- Move image to separate module by [@jlowin](https://github.com/jlowin) in [#9](https://github.com/PrefectHQ/fastmcp/pull/9)
- Add support for request context, progress, logging, etc. by [@jlowin](https://github.com/jlowin) in [#12](https://github.com/PrefectHQ/fastmcp/pull/12)
- Add context tests and better runtime loads by [@jlowin](https://github.com/jlowin) in [#13](https://github.com/PrefectHQ/fastmcp/pull/13)
- Refactor tools + resourcemanager by [@jlowin](https://github.com/jlowin) in [#14](https://github.com/PrefectHQ/fastmcp/pull/14)
- func → fn everywhere by [@jlowin](https://github.com/jlowin) in [#15](https://github.com/PrefectHQ/fastmcp/pull/15)
- Add support for prompts by [@jlowin](https://github.com/jlowin) in [#16](https://github.com/PrefectHQ/fastmcp/pull/16)
- Create LICENSE by [@jlowin](https://github.com/jlowin) in [#18](https://github.com/PrefectHQ/fastmcp/pull/18)
- Update cli file spec by [@jlowin](https://github.com/jlowin) in [#19](https://github.com/PrefectHQ/fastmcp/pull/19)
- Update readmeUpdate README by [@jlowin](https://github.com/jlowin) in [#20](https://github.com/PrefectHQ/fastmcp/pull/20)
- Use hatchling for version by [@jlowin](https://github.com/jlowin) in [#21](https://github.com/PrefectHQ/fastmcp/pull/21)

### [​](#other-changes--49) Other Changes 🦾

- Add echo server by [@jlowin](https://github.com/jlowin) in [#1](https://github.com/PrefectHQ/fastmcp/pull/1)
- Add github workflows by [@jlowin](https://github.com/jlowin) in [#2](https://github.com/PrefectHQ/fastmcp/pull/2)
- typing updates by [@zzstoatzz](https://github.com/zzstoatzz) in [#17](https://github.com/PrefectHQ/fastmcp/pull/17)

### [​](#new-contributors-47) New Contributors

- [@jlowin](https://github.com/jlowin) made their first contribution in [#1](https://github.com/PrefectHQ/fastmcp/pull/1)
- [@zzstoatzz](https://github.com/zzstoatzz) made their first contribution in [#17](https://github.com/PrefectHQ/fastmcp/pull/17)

**Full Changelog**: [v0.2.0…v0.3.0](https://github.com/PrefectHQ/fastmcp/compare/v0.2.0...v0.3.0)

[​](#v0-2-0)

v0.2.0

2024-11-30

## [​](#v0-2-0) [v0.2.0](https://github.com/PrefectHQ/fastmcp/releases/tag/v0.2.0)

**Full Changelog**: [v0.1.0…v0.2.0](https://github.com/PrefectHQ/fastmcp/compare/v0.1.0...v0.2.0)

[​](#v0-1-0)

v0.1.0

2024-11-30

## [​](#v0-1-0) [v0.1.0](https://github.com/PrefectHQ/fastmcp/releases/tag/v0.1.0)

The very first release of FastMCP! 🎉**Full Changelog**: [Initial commits](https://github.com/PrefectHQ/fastmcp/commits/v0.1.0)

[FastMCP Updates

Previous](gofastmcp__com__updates.md)[FAQ

Next](gofastmcp__com__more__faq.md)






