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Title: Use shared `is_async_callable` instead of `inspect.iscoroutinefunction` by Kludex · Pull Request #2389 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: Use shared `is_async_callable` instead of `inspect.iscoroutinefunction` by Kludex · Pull Request #2389 · modelcontextprotocol/python-sdk

X Title: Use shared `is_async_callable` instead of `inspect.iscoroutinefunction` by Kludex · Pull Request #2389 · modelcontextprotocol/python-sdk

Description: Summary inspect.iscoroutinefunction misses callable objects with an async __call__ and functools.partial-wrapped coroutines. The tools/base.py module already had a local _is_async_callable helper that handles these cases, but the prompts, resources, and templates modules were using the raw inspect.iscoroutinefunction. This PR extracts the helper into mcp.shared._callable_inspection.is_async_callable (adapted from Starlette's implementation) and replaces all inspect.iscoroutinefunction usage across the codebase. Test plan All 333 mcpserver tests pass pyright clean on all changed files ruff lint + format clean

Open Graph Description: Summary inspect.iscoroutinefunction misses callable objects with an async __call__ and functools.partial-wrapped coroutines. The tools/base.py module already had a local _is_async_callable helper t...

X Description: Summary inspect.iscoroutinefunction misses callable objects with an async __call__ and functools.partial-wrapped coroutines. The tools/base.py module already had a local _is_async_callable helper t...

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/pull/2389

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1995794 Use shared `is_async_callable` instead of `inspect.iscoroutinefunction` Kludex Apr 3, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2389/commits/1995794bda664ed68a8e04f8e3131343daae1c88
a8340e4 Add reference link to Starlette source in docstring Kludex Apr 3, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2389/commits/a8340e4ec6aea48c26571d4c317f90ebeb52f8b6
cfafb2f Use correct branch name in Starlette reference link Kludex Apr 3, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2389/commits/cfafb2f33d530173a4f7a2d530e05fc505abe725
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