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test: cover raw invalid UTF-8 stdio regression#2370

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raashish1601 wants to merge 1 commit intomodelcontextprotocol:mainfrom
raashish1601:contributor-65/python-sdk-2328-raw-invalid-utf8-stdio
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test: cover raw invalid UTF-8 stdio regression#2370
raashish1601 wants to merge 1 commit intomodelcontextprotocol:mainfrom
raashish1601:contributor-65/python-sdk-2328-raw-invalid-utf8-stdio

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@raashish1601 raashish1601 commented Mar 28, 2026

Summary

  • add a regression test for raw invalid UTF-8 bytes over the stdio transport
  • reproduce the issue-specific EOF race by delaying tool-side validation until after stdin closes
  • assert the server still completes initialization and exits cleanly instead of crashing with ClosedResourceError

Closes #2328.

Testing

  • PYTHONPATH=src python -m pytest tests/issues/test_2328_raw_invalid_utf8_stdio.py
  • python -m ruff check tests/issues/test_2328_raw_invalid_utf8_stdio.py
  • git diff --check

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raashish1601 commented Mar 28, 2026

Closing this duplicate in favor of #2369. The additional delayed-validation EOF regression was pushed as follow-up commit c492865 onto the existing PR branch.

@raashish1601 raashish1601 deleted the contributor-65/python-sdk-2328-raw-invalid-utf8-stdio branch March 28, 2026 14:29
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[Bug] Server crashes with anyio.ClosedResourceError when receiving raw invalid UTF-8 bytes

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