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kevinveenbirkenbachandClaude Opus 5
657015852a
`test_parallel_sessions_append_every_message_once` asserted that more than one of four sessions had appended something. ThreadPoolExecutor promises a thread count, never that every worker takes an item from a shared iterator, so a loaded host where one thread drains all 40 messages before its siblings start fails the assertion with nothing broken. CI did exactly that in run 40023932276; 25 local runs pinned to a single CPU did not. The sessions now meet at a barrier before their first append. A pool that runs them concurrently releases all four, and a serialised one reaches the timeout and leaves the later sessions empty, which the assertion still catches: with max_workers forced to 1 the test fails with the same "1 not greater than 1" CI reported. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>