1 Release published by 1 person

• v1.9.1

  published May 22, 2025

12 Pull requests merged by 11 people

• Fix async callable object tools

  #568 merged May 23, 2025

• add support for parallel run

  #739 merged May 23, 2025

• Python lint: Ruff rule PLW1510 -- subprocess-run-without-check

  #794 merged May 23, 2025

• Support custom httpx client creation

  #752 merged May 23, 2025

• llamallama-3.2-90b-vision-preview is deprecated

  #523 merged May 23, 2025

• Chatbot example: clean up servers in correct order

  #353 merged May 23, 2025

• Fix ClientSessionGroup cleanup logic

  #787 merged May 23, 2025

• fix: Pass cursor parameter to server

  #745 merged May 21, 2025

• Change default binding from 0.0.0.0 to 127.0.0.1 to align with security recommendations

  #738 merged May 20, 2025

• add auth client sse

  #760 merged May 20, 2025

• fastmcp: allow passing Tool directly to FastMCP constructor

  #699 merged May 20, 2025

• Add OAuth authentication client for HTTPX

  #751 merged May 19, 2025

15 Pull requests opened by 15 people

• Issue 687 fix

  #747 opened May 19, 2025

• feat: Add output schema generation for tools and update documentation

  #757 opened May 19, 2025

• fix: add status field in Resource class and Resource as a return type in CallToolResult

  #758 opened May 19, 2025

• Add support for remote-oauth-support Fix #686

  #764 opened May 20, 2025

• Align stdio shutdown sequence with spec

  #765 opened May 21, 2025

• [OpenAI Codex PR] Fix cleanup order issue with task groups

  #773 opened May 21, 2025

• Improve error handling during request validation in BaseSession

  #774 opened May 21, 2025

• fix: improve misleading warning for progress callback exceptions

  #775 opened May 21, 2025

• Webhooks

  #777 opened May 21, 2025

• Fix OAuth metadata validation for compliant servers

  #778 opened May 21, 2025

• Fix building auth metadata paths

  #779 opened May 22, 2025

• Fix 307 Temporary Redirect when use streamable_http

  #781 opened May 22, 2025

• Implementation of the proposal for modular design

  #782 opened May 22, 2025

• Handles message type Exception in lowlevel/server.py _handle_message function. Mentioned as TODO on line 528.

  #786 opened May 22, 2025

• fix: Clean up sessions from manager when terminated via DELETE request

  #791 opened May 23, 2025

7 Issues closed by 5 people

• `Tool.from_function` does not handle asynchronous callable objects

  #567 closed May 23, 2025

• Error during cleanup of server sqlite: Attempted to exit cancel scope in a different task than it was entered in

  #252 closed May 23, 2025

• Cursors are not sent to the server correctly

  #735 closed May 21, 2025

• `mcp.resource` doesn't generate correctly description from func.__doc__.

  #488 closed May 21, 2025

• Allow Direct inputSchema Registration for Tools (Critical for API Gateway Integration)

  #761 closed May 21, 2025

• RuntimeError: Task group is not initialized. Make sure to use run().

  #753 closed May 19, 2025

• when server run with sse, the mount_path never work

  #748 closed May 19, 2025

26 Issues opened by 26 people

• Support for API Gateway Path Prefixes in SSE Client URL Handling

  #795 opened May 23, 2025

• The official example code does not work

  #793 opened May 23, 2025

• MCP servers can not be accessed via Docker and docker-compose anymore.

  #790 opened May 23, 2025

• mcp-simple-streamablehttp-stateless not working as expected

  #789 opened May 23, 2025

• adding multiple servers using the ClientSessionGroup, an error occurs when closing the connection

  #788 opened May 23, 2025

• await mcp.client.stdio.stdio_client has no return with mcp 1.9.0

  #785 opened May 22, 2025

• Getting as async generator object instead of data being to be received as an output through streamable-Http

  #784 opened May 22, 2025

• mount_path does not work with sse_app

  #783 opened May 22, 2025

• mcp dev server.py Error: Cannot find module '../lib/cli.js'

  #780 opened May 22, 2025

• Misleading warning for progress callback exceptions

  #776 opened May 21, 2025

• No support of inputSchema in mcp.tool decorator

  #772 opened May 21, 2025

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

  #771 opened May 21, 2025

• Implement asynchronous task execution with result retrieval after connection loss

  #769 opened May 21, 2025

• Client example 'mcp_simple_auth' cannot connect to the server

  #768 opened May 21, 2025

• Feature Proposal: Modular Router System for MCP Python SDK

  #767 opened May 21, 2025

• (discussion) How to best handle instrumenting for `resources` and `prompts`

  #766 opened May 21, 2025

• Allow installing mcp servers from local packages

  #762 opened May 20, 2025

• No way to return `nextCursor` using list_resources decorator

  #759 opened May 20, 2025

• Stateless Mode memory leak

  #756 opened May 19, 2025

• MCP External Library Callback Support

  #755 opened May 19, 2025

• Functionality to fetch output schemas as well on list_tools()

  #754 opened May 19, 2025

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

  #750 opened May 19, 2025

• Support anything other than strings in GetPromptRequestParams

  #749 opened May 19, 2025

• For resources, is there TTL for client to cache data

  #746 opened May 18, 2025

• test_streamable_http.py::test_streamablehttp_client_resumption hangs intermittently

  #744 opened May 17, 2025

• RuntimeError but the actual root cause is not logged correctly

  #743 opened May 17, 2025

45 Unresolved conversations

Sometimes conversations happen on old items that aren’t yet closed. Here is a list of all the Issues and Pull Requests with unresolved conversations.

• Feature/add enable disable methods tools

  #728 commented on May 23, 2025 • 2 new comments

• Python lint: Ruff rules for pylint and code complexity

  #525 commented on May 23, 2025 • 2 new comments

• Add deepwiki link

  #694 commented on May 22, 2025 • 1 new comment

• add Tool.outputSchema and CallToolResult.structuredContent

  #685 commented on May 23, 2025 • 1 new comment

• Adding description field to the FastMCP get_prompt method

  #614 commented on May 23, 2025 • 1 new comment

• Conditionally Add Tools to an MCP

  #556 commented on May 17, 2025 • 0 new comments

• sse_app() ignores mount prefix, resulting in 404 from client

  #412 commented on May 23, 2025 • 0 new comments

• Added support for raw request injection in RequestContext.

  #380 commented on May 23, 2025 • 0 new comments

• fix: enables context injection into resources

  #413 commented on May 23, 2025 • 0 new comments

• Fix setup instructions for Claud and MCP

  #425 commented on May 23, 2025 • 0 new comments

• Added RFC 6570 complaint form style query expansion as optional param…

  #427 commented on May 23, 2025 • 0 new comments

• Add optional headers argument to websocket transport

  #455 commented on May 23, 2025 • 0 new comments

• fix: implemented exception handling for client indefinite blocks

  #500 commented on May 23, 2025 • 0 new comments

• Custom MCP requests + hooks

  #535 commented on May 23, 2025 • 0 new comments

• test: add pytest coverage for SSE transport functions

  #557 commented on May 23, 2025 • 0 new comments

• Fix Windows subprocess NotImplementedError (STDIO clients)

  #596 commented on May 17, 2025 • 0 new comments

• Sending cancellation notification to server based on client anyio.CancelScope status

  #628 commented on May 18, 2025 • 0 new comments

• Tests(cli): Add coverage for helper functions

  #635 commented on May 23, 2025 • 0 new comments

• OutputSchema support in MCP tools

  #654 commented on May 23, 2025 • 0 new comments

• Move `Prompt` object instantiation from server to prompt manager

  #687 commented on May 23, 2025 • 0 new comments

• feat: support audio content

  #725 commented on May 23, 2025 • 0 new comments

• feat: support embedded resources in sampling

  #727 commented on May 21, 2025 • 0 new comments

• Subprocess kill win32

  #729 commented on May 23, 2025 • 0 new comments

• MCP Tool execution hangs indefinitely in stdio mode when calling external Python scripts

  #671 commented on May 17, 2025 • 0 new comments

• Enable Server-Initiated Notifications to All Connected Clients

  #741 commented on May 17, 2025 • 0 new comments

• subscribe_resource return NotImplementedError

  #491 commented on May 17, 2025 • 0 new comments

• ValueError: I/O operation on closed pipe

  #716 commented on May 18, 2025 • 0 new comments

• Failed to run server: module 'mcp' has no attribute 'run'

  #560 commented on May 19, 2025 • 0 new comments

• MCP SSE Server: Received request before initialization was complete

  #423 commented on May 20, 2025 • 0 new comments

• Running Simple Auth Github Example throws 404 error

  #679 commented on May 20, 2025 • 0 new comments

• Auth for MCP - Starlette middleware vs. OAuthAuthorizationServerProvider

  #702 commented on May 20, 2025 • 0 new comments

• 401 unauthorized on simple-auth example

  #731 commented on May 20, 2025 • 0 new comments

• Fastmcp tool parameter parsing type error

  #381 commented on May 20, 2025 • 0 new comments

• Failed to run server: No module named 'sqlalchemy'

  #605 commented on May 20, 2025 • 0 new comments

• MCP server with STDIO transport throws an 'Error: SSE connection not established' when attempting to connect via MCP Inspector

  #542 commented on May 21, 2025 • 0 new comments

• How to mount streamable HTTP app to an existing starlette app

  #673 commented on May 21, 2025 • 0 new comments

• Expected ',' or ']' after array element in JSON in every MCP-Response

  #290 commented on May 21, 2025 • 0 new comments

• dynamic resource not working in Claude desktop

  #263 commented on May 21, 2025 • 0 new comments

• `RuntimeError: Attempted to exit cancel scope in a different task` when cleaning up multiple MCPClient instances out-of-order

  #577 commented on May 21, 2025 • 0 new comments

• cannot get response from await session.call_tool()

  #262 commented on May 21, 2025 • 0 new comments

• MCP Server Session Lost in Multi-Worker Environment

  #520 commented on May 22, 2025 • 0 new comments

• Option to not rewrite the logging configuration

  #420 commented on May 22, 2025 • 0 new comments

• Bug Report: FastMCP `RuntimeError: Received request before initialization was complete` Leading to Empty SSE Responses When Embedded in FastAPI

  #737 commented on May 22, 2025 • 0 new comments

• SSE does not work on nested routes

  #733 commented on May 23, 2025 • 0 new comments

• 307 Temporary Redirect

  #732 commented on May 23, 2025 • 0 new comments