Fix Python E2E test flakiness and missing pytest-timeout

[SteveSandersonMS]

Summary

Fixes the Python E2E test failure in CI: https://github.com/github/copilot-sdk/actions/runs/21746470248/job/62733447842

Changes

1. Fix race condition in test cleanup (context.py)

The test fixture cleanup was failing with OSError: Directory not empty when shutil.rmtree() tried to delete session-state directories while background processes were still writing files.

Fix: Added ignore_errors=True to shutil.rmtree() and missing_ok=True to unlink() to gracefully handle these race conditions.

2. Add missing pytest-timeout dependency (pyproject.toml)

The test_compaction.py test uses @pytest.mark.timeout(120) but the pytest-timeout plugin was not installed, causing the warning: Unknown pytest.mark.timeout

Fix: Added pytest-timeout>=2.0.0 to dev dependencies.

[Copilot]

Copilot reviewed 2 out of 3 changed files in this pull request and generated 1 comment.

Comments suppressed due to low confidence (1)

python/e2e/testharness/context.py:112

• The approach of silently ignoring errors with ignore_errors=True could mask legitimate issues beyond race conditions (e.g., permission problems, disk failures, or other filesystem errors). The Node.js SDK uses a more robust retry mechanism with exponential backoff (see nodejs/test/e2e/harness/sdkTestContext.ts:99-101) which would distinguish between transient race conditions and persistent failures.

Consider implementing a similar retry mechanism for Python instead of silently ignoring all errors. This would make cleanup more reliable while still providing visibility into persistent issues.

                shutil.rmtree(item, ignore_errors=True)

[github-actions]

Cross-SDK Consistency Review ✅

I've reviewed this PR for consistency across all SDK implementations. No consistency issues found - this change maintains good cross-language parity.

Summary

This PR fixes Python E2E test flakiness by handling race conditions during test cleanup. All three major SDKs handle the same problem with language-appropriate patterns:

SDK	Cleanup Strategy	Location
Python	ignore_errors=True + missing_ok=True ✨ (this PR)	python/e2e/testharness/context.py
Node.js	Retry mechanism (5 attempts, 2s delay)	nodejs/test/e2e/harness/sdkTestContext.ts:99-100
.NET	Try-catch blocks silently catching exceptions	dotnet/test/Harness/E2ETestContext.cs:105-106

Analysis

The Python change appropriately uses Python idioms (ignore_errors, missing_ok) rather than forcing a retry pattern from Node.js or try-catch from .NET. Each approach is equivalent in handling the race condition where background processes may still be writing files during cleanup.

The addition of pytest-timeout>=2.0.0 is Python-specific and has no cross-SDK implications (each language uses its own test timeout mechanisms).

Recommendation: ✅ Approve - maintains cross-SDK consistency while using appropriate language idioms.

AI generated by SDK Consistency Review Agent