[fswair]

Summary

Fix: codex-auth-helper async clients now work on successive event loops.

The HTTP clients the helper owns (the Codex API client and the token-refresh client) kept their pooled connections bound to the first event loop. A request on a later loop, for example a second asyncio.run, or a host such as Kedi that closes its shared loop between runs, reused one of those connections and failed with RuntimeError: Event loop is closed. Closing the client afterwards reported the same error.

Pydantic AI already refreshes the clients its providers own in this situation, but never a client passed in through OpenAIProvider(openai_client=...), which is how create_codex_responses_model builds the model. So the fix belongs here:

• Both owned clients remember the loop they last ran on and are replaced once that loop has stopped. A loop that still runs is left alone, matching Pydantic AI.
• The SDK client is now built with the public DefaultAsyncHttpxClient. The SDK's default wrapper closes itself from its finalizer on whatever loop runs then, so a replaced client would have tried to close on the wrong loop.
• close() skips a client whose loop has stopped; its connections went with that loop.
• Borrowed clients (http_client=, auth_http_client=) are never replaced or closed, as before.

Pydantic AI 2.66. Support widens to pydantic-ai-slim<=2.66.0, and Harness moves to 0.66.0. The CI and Makefile matrices add 2.64.0, 2.65.0 and 2.66.0. Versions are bumped to 1.13.0.

Testing

• New tests/codex_auth_helper/test_event_loops.py runs real keep-alive HTTP requests across successive asyncio.run calls and fails on main for both the SDK client and the token refresh client.
• The pre-commit hook passed: version ordering, ruff, coverage thresholds, and build verification including the full Pydantic AI matrix 2.9.0–2.66.0.
• make tests, check, check-formatted, check-coverage, docs-build, release-check and check-langchain-stack pass.
• Checked end to end with Kedi and a real Codex login: run_main() twice on one runtime, a second runtime closed in between, then a clean aclose().

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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