chore(deps): update dependency fastmcp to v3.3.1#477
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This PR contains the following updates:
3.2.4→3.3.1Warning
Some dependencies could not be looked up. Check the Dependency Dashboard for more information.
Release Notes
PrefectHQ/fastmcp (fastmcp)
v3.3.1: : Loop There It IsCompare Source
FastMCP 3.3.1 is a hotfix for the 3.3 packaging split. Clean installs of 3.3.0 could fail on standalone component imports like
from fastmcp.tools import toolbecause component modules reached auth and task primitives throughfastmcp.server, pulling in the server/provider stack and exposing a circular import.Component-level auth and task primitives now live in lightweight utility modules, with the old server import paths preserved as compatibility re-exports. Component imports stay lightweight, existing server-facing imports continue to work, and the release also includes small docs corrections from the 3.3 rollout.
What's Changed
Fixes 🐞
Full Changelog: PrefectHQ/fastmcp@v3.3.0...v3.3.1
v3.3.0: : Slim ReaperCompare Source
FastMCP 3.3 ships
fastmcp-slim, a new lightweight distribution that separates the client from the server stack. It also closes out a meaningful backlog of security hardening, observability improvements, and auth additions that accumulated through the 3.2 cycle.fastmcp-slim
The full FastMCP package pulls in Starlette, Uvicorn, and the rest of the server machinery — necessary for running a server, but wasteful if you're writing a client, a script, or an agent that just needs to talk to MCP.
fastmcp-slimis a dependency-light distribution that ships the client and transport layer without any of that.The import namespace is unchanged:
Install
fastmcp-slim[client]anywhere you want FastMCP's client without the server footprint — CI environments, lightweight agents, library dependencies that shouldn't force Uvicorn on downstream users.Security
The OAuth proxy received three hardening upgrades. Silent consent is now guarded against AS-in-the-middle attacks — a malicious authorization server can no longer silently approve a consent it wasn't meant to handle. Redirect URI allowlist matching now rejects dot-segment paths (
/../,/./) that could otherwise bypass prefix checks. AndResponseCachingMiddlewarepartitions its cache by access token, closing a gap where different users could see each other's cached responses.Auth
AzureB2CProvideradds first-class support for Azure AD B2C user flows. The OCI provider is fixed for 3.x installs. AndOAuthProxygains a publicupdate_scopes()API for updating the proxy's required scopes after initialization — useful for servers that determine scope requirements at runtime.Observability
OTEL instrumentation is now fully compliant with MCP semantic conventions. List operations (
list_tools,list_resources,list_prompts,list_resource_templates) are instrumented, and delegate spans on proxy servers are enriched with backend attributes.Thread Affinity
Sync tools run in a thread pool by default. If your tool holds thread-local state or is bound to a specific thread (UI frameworks, some database drivers), you can now opt out:
Under the Hood
Docket is now reentrant, and mounted servers enter their own lifespan — so a server with startup/shutdown logic works correctly when composed into a larger server. The
FastMCPconstructor acceptsexperimental_capabilitiesfor passing raw capability flags. Tool errors accept alog_levelparameter to control how they're logged.FormInputsupports a default prefill value.Fixes: ping loop now exits cleanly when a stream closes; sampling from background tasks works correctly; Windows startup no longer crashes on non-UTF-8 console output; blank query string values are preserved in OpenAPI routing;
$defsintroduced byArgTransformare hoisted to the schema root; HTTP transports are terminated before lifespan shutdown.13 new contributors this release.
What's Changed
New Features 🎉
Enhancements ✨
Security 🔒
Fixes 🐞
Docs 📚
Dependencies 📦
Other Changes 🦾
New Contributors
Full Changelog: PrefectHQ/fastmcp@v3.2.4...v3.3.0
Configuration
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