python-sdk

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**Is your feature request related to a problem? Please describe.** To run testing on local servers, I would like the option to not verify certificates. **Describe the solution you'd like**...

lairdresearch

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

5

**Describe the bug** When using FastMCP in stdio transport mode, any tool that attempts to execute an external Python script will hang indefinitely until timeout, without returning any result or...

ycycycl

STDIO hangs forever when the using multiprocessing in tools

2

**Describe the bug** when multiprocessing in a tool, and start mcp client by STDIO, the mcp server never response. **To Reproduce** Steps to reproduce the behavior: 1. write mcp server:...

huang-sh

**Describe the bug** The current implementation of OauthMetadata is too restrictive **To Reproduce** Steps to reproduce the behavior: 1. Initialize an OAuth config as described in the [README](https://github.com/modelcontextprotocol/python-sdk/blob/6e418e62f9446e3204f4bf889efcd9e6df76aef8/README.md#oauth-authentication-for-clients) 2. Use...

sakalys

INFO: 127.0.0.1:52574 - "DELETE /mcp/ HTTP/1.1" 200 OK [05/28/25 12:07:55] INFO HTTP Request: POST http://127.0.0.1:10003/mcp "HTTP/1.1 307 Temporary Redirect" _client.py:1740 INFO HTTP Request: POST http://127.0.0.1:10003/mcp "HTTP/1.1 307 Temporary Redirect" _client.py:1740...

freedba

Hi, Thanks for the great work on this SDK! I have a question regarding the `stdio` MCP client. In particular: - Does a single `Stdio Client Session` support concurrent operations?...

kalelsun

`tools/call` with string `arguments` breaks mcp server until restart

3

**Describe the bug** When making a `tools/call` JSON-RPC request to the mcp server, passing the `arguments` parameter as a string instead of an object causes the server to stop responding...

Sillocan

Throwing an error when the function takes too long, TypeError: 'NoneType' object is not callable

5

Throwing an error when the function takes too long ```python import asyncio from mcp.server.fastmcp import FastMCP mcp = FastMCP("Demo") @mcp.tool() async def add(a: int, b: int) -> int: # await...

wukan1986

ValueError: I/O operation on closed pipe

3

**Describe the bug** The code runs but at the end I get a ValueError: I/O operation on closed pipe ```shell Exception ignored in: Traceback (most recent call last): File "C:\Users\Fractal\AppData\Roaming\uv\python\cpython-3.11.11-windows-x86_64-none\Lib\asyncio\proactor_events.py",...

Fractal-0

feat: Add output schema generation for tools and update documentation

1

# Output Schema Support with Semantic Metadata Enhancement This PR adds automatic JSON Schema generation for tool return types with intelligent semantic metadata enhancement, enabling LLMs and client applications to...

PratyushNag