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MCP Server Hangs Indefinitely After KqueueSelector Log on macOS (Python 3.12, Both STDIO & SSE)

2

**Describe the bug** When running an MCP server using `mcp-sdk` (both `FastMCP` and the low-level `Server` with `mcp.server.stdio.stdio_server`) on macOS with Python 3.12, the server process hangs indefinitely immediately after...

jlcases

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

4

Since the last update to version 1.9.1, any of the Docker setups that run any MCP servers are not working anymore. This bug is because since 1.9.1, the `host` from...

Vildnex

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

2

**Describe the bug** When adding multiple servers using the Client Session Group, an error occurs when closing the connection No problem when adding only one server **code** ``` async def...

gaojun1212

client_credentials grant type for mcp oauth

1

**Describe the solution you'd like** support client_credentials for app to app auth **Additional context** MCP doc mentioned https://modelcontextprotocol.io/specification/2025-03-26/basic/authorization#2-1-1-oauth-grant-types `client credential` grant type is also supported, just wondering if we have...

elvis-cai

Fix: Prevent session manager shutdown on individual session crash

1

Previously, an unhandled exception within a single MCP session's `MCPServer.run()` task could propagate to the `StreamableHTTPSessionManager`'s main task group. This would cause the entire task group to cancel, effectively shutting...

soby

Fix Windows subprocess NotImplementedError (STDIO clients)

10

Fix subprocess creation errors on Windows for STDIO client connections. This updates `create_windows_process` to properly handle the case where asyncio cannot create subprocess transports on Windows by falling back to...

theailanguage

how to manage multi streamable http server lifespan

7

**Describe the bug** I write a multi streamable http server example according to your readme doc, but only the mcp server which pass the session_manager.run() to FastAPI works right **To...

AniviaTn

Type system complexity creating developer friction and maintenance overhead

1

## Context I've been working with the Python SDK and noticed that the type system has quite a bit of abstraction complexity compared to the underlying TypeScript schema. I'm curious...

davenpi

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

3

i want to create a mcp server base on streamablehttp_stateless running mode(https://github.com/modelcontextprotocol/python-sdk/blob/main/examples/servers/simple-streamablehttp-stateless/mcp_simple_streamablehttp_stateless/server.py example code), but i can not find any mothed to get http request msg in the tools logic....

kelify

MCP SSE Server: Received request before initialization was complete

18

**Describe the bug** The MCP server receives `Received request before initialization was complete` after a second deployment when a client is trying to list the different tools or even when...

folkvir