tests/cli/test_run.py intermittently times out on Windows (Python 3.10, windows-latest), causing CI failures unrelated to the PR under test. The test appears to hang inside asyncio's selector loop while running a stdio transport test, eventually triggering pytest-timeout's thread-level timeout.
Example run: https://github.com/PrefectHQ/fastmcp/actions/runs/24585375099/job/71893509389
Observed on #3960, but the failure has no connection to that PR's changes and we've seen similar stdio timeouts on Windows across other PRs.
Worth investigating the stdio transport tests specifically — likely candidates:
- Process spawn/teardown timing that's racier on Windows
keep_alive=True not cleaning up cleanly under pytest-xdist- Selector-based event loop quirks on Windows 3.10
Separating this from any one PR's diff so it doesn't keep blocking unrelated merges.
tests/cli/test_run.pyintermittently times out on Windows (Python 3.10,windows-latest), causing CI failures unrelated to the PR under test. The test appears to hang inside asyncio's selector loop while running a stdio transport test, eventually triggering pytest-timeout's thread-level timeout.Example run: https://github.com/PrefectHQ/fastmcp/actions/runs/24585375099/job/71893509389
Observed on #3960, but the failure has no connection to that PR's changes and we've seen similar stdio timeouts on Windows across other PRs.
Worth investigating the stdio transport tests specifically — likely candidates:
keep_alive=Truenot cleaning up cleanly underpytest-xdistSeparating this from any one PR's diff so it doesn't keep blocking unrelated merges.