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Fast MCP Server Initializes Twice

bugSomething isn't workingSomething isn't working

P1Significant bug affecting many users, highly requested featureSignificant bug affecting many users, highly requested feature

ready for workEnough information for someone to start working onEnough information for someone to start working on

Status: Open.

#301 In modelcontextprotocol/python-sdk;

· dino-su opened on Mar 17, 2025

fastmcp.run() runtimeerror: task group is not initialized. make sure to use run().

bugSomething isn't workingSomething isn't working

needs reproneeds additional information to be able to reproduce bugneeds additional information to be able to reproduce bug

Status: Open.

#1372 In modelcontextprotocol/python-sdk;

· SinDongHwan opened on Sep 17, 2025

Bug Report: FastMCP <code>RuntimeError: Received request before initialization was complete</code> Leading to Empty SSE Responses When Embedded in FastAPI

bugSomething isn't workingSomething isn't working

P1Significant bug affecting many users, highly requested featureSignificant bug affecting many users, highly requested feature

ready for workEnough information for someone to start working onEnough information for someone to start working on

Status: Open.

#737 In modelcontextprotocol/python-sdk;

· jasny6969 opened on May 16, 2025

Different models for the same entity for FastMCP vs low-level.Server.

enhancementNew feature or requestNew feature or request

P1Significant bug affecting many users, highly requested featureSignificant bug affecting many users, highly requested feature

ready for workEnough information for someone to start working onEnough information for someone to start working on

Status: Open.

#1033 In modelcontextprotocol/python-sdk;

· aravadani opened on Jun 26, 2025

Option to not rewrite the logging configuration

feature requestRequest for a new feature that's not currently supportedRequest for a new feature that's not currently supported

P1Significant bug affecting many users, highly requested featureSignificant bug affecting many users, highly requested feature

ready for workEnough information for someone to start working onEnough information for someone to start working on

Status: Open.

#420 In modelcontextprotocol/python-sdk;

· carlosemart opened on Apr 3, 2025

Specifying capabilities w/ FastMCP Server

feature requestRequest for a new feature that's not currently supportedRequest for a new feature that's not currently supported

good first issueGood for newcomersGood for newcomers

P2Moderate issues affecting some users, edge cases, potentially valuable featureModerate issues affecting some users, edge cases, potentially valuable feature

PR welcomePRs for this issue are welcome and will be reviewed by maintainersPRs for this issue are welcome and will be reviewed by maintainers

ready for workEnough information for someone to start working onEnough information for someone to start working on

v2Ideas, requests and plans for v2 of the SDK which will incorporate major changes and fixesIdeas, requests and plans for v2 of the SDK which will incorporate major changes and fixes

Status: Open.

#1126 In modelcontextprotocol/python-sdk;

· chrisagrams opened on Jul 11, 2025

how to trigger a resources_changed or listChanged

feature requestRequest for a new feature that's not currently supportedRequest for a new feature that's not currently supported

P2Moderate issues affecting some users, edge cases, potentially valuable featureModerate issues affecting some users, edge cases, potentially valuable feature

ready for workEnough information for someone to start working onEnough information for someone to start working on

v2Ideas, requests and plans for v2 of the SDK which will incorporate major changes and fixesIdeas, requests and plans for v2 of the SDK which will incorporate major changes and fixes

Status: Open.

#710 In modelcontextprotocol/python-sdk;

· skunkwerk opened on May 14, 2025

How to receive notifications on mcp client side?

feature requestRequest for a new feature that's not currently supportedRequest for a new feature that's not currently supported

improves sdk consistencyImproves consistency with other SDKs such as TyepscriptImproves consistency with other SDKs such as Tyepscript

improves spec complianceWhen a change improves ability of SDK users to comply with spec definitionWhen a change improves ability of SDK users to comply with spec definition

P0Broken core functionality, security issues, critical missing featureBroken core functionality, security issues, critical missing feature

ready for workEnough information for someone to start working onEnough information for someone to start working on

Status: Open.

#889 In modelcontextprotocol/python-sdk;

· shashisingh opened on Jun 5, 2025

How tools should be created to use images in Claude Desktop?

bugSomething isn't workingSomething isn't working

P0Broken core functionality, security issues, critical missing featureBroken core functionality, security issues, critical missing feature

ready for workEnough information for someone to start working onEnough information for someone to start working on

Status: Open.

#771 In modelcontextprotocol/python-sdk;

· alexlopezcifuentes opened on May 21, 2025

FastMCP: Support dynamic annotation updates

feature requestRequest for a new feature that's not currently supportedRequest for a new feature that's not currently supported

improves spec complianceWhen a change improves ability of SDK users to comply with spec definitionWhen a change improves ability of SDK users to comply with spec definition

P2Moderate issues affecting some users, edge cases, potentially valuable featureModerate issues affecting some users, edge cases, potentially valuable feature

Status: Open.

#1475 In modelcontextprotocol/python-sdk;

· maxisbey opened on Oct 13, 2025

how to get http request headers in mcp tools logic when i use streamable http mode to run mcp server ?

feature requestRequest for a new feature that's not currently supportedRequest for a new feature that's not currently supported

P2Moderate issues affecting some users, edge cases, potentially valuable featureModerate issues affecting some users, edge cases, potentially valuable feature

ready for workEnough information for someone to start working onEnough information for someone to start working on

Status: Open.

#750 In modelcontextprotocol/python-sdk;

· kelify opened on May 19, 2025