Issues · modelcontextprotocol/python-sdk · GitHub

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Pin `httpx<1.0` (or similar upper bound) — `pip install --pre` resolves `httpx 1.0.dev3` and breaks `httpx-sse`

#2543

· SyncTekLLC opened

on May 5, 2026

raise ValueError(str(e)) discards exception chain in get_prompt handler

#2541

· blackwell-systems opened

on May 5, 2026

Bug: task_result_handler.py serializes None optional fields as JSON null, breaking Node SDK Zod validation

#2539

· rynowak opened

on May 4, 2026

Python 3.14 not listed as a supported python version in README badge

#2537

· joshdavham opened

on May 3, 2026

InMemoryTaskStore.wait_for_update has lost-wakeup races (concurrent waiters, notify-before-wait)

#2535

· blackwell-systems opened

on May 2, 2026

FastMCP.init clobbers root logger with INFO RichHandler — hangs stdio servers under back-pressure

#2527

· mdbro opened

on May 1, 2026

ResourceContents.uri made non-nullable in 1.27.0, breaking servers that return uri=null

#2519

· divssheth opened

on Apr 29, 2026

Trying to connect to a MCP url got the follwing error any idea why ?

#2517

· user1500177 opened

on Apr 28, 2026

`ClientSession` never sends `notifications/cancelled` when `call_tool` is cancelled — server-side coroutines leak

#2507

· sherman94062 opened

on Apr 26, 2026

Was it a bad idea to stream the text generation process using Context.report_progress()?

#2501

· lottopotato opened

on Apr 24, 2026

Concurrent server-side requests are serialized end-to-end by BaseSession

#2489

· demoray opened

on Apr 21, 2026

Split the core from the server and client implementations

#2486

· leiserfg opened

on Apr 21, 2026