fix(sdk): execute the first message to a freshly-joined peer exactly once [INT-969]#477
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AlexanderZ-Band merged 10 commits intoJul 23, 2026
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Green regressions locking current single-context guarantees: - The gateway sequence (message posted before the peer's context is live, delivered via /next with the WebSocket copy arriving mid-execution) executes the handler exactly once. - Cancellation mid-processing releases the local in-flight claim. Red targets defining the desired lifecycle, to turn green with the fix: - Two live contexts for one room execute a shared message once. - ACK_PENDING state survives LRU pressure instead of being evicted into a side-effect replay on redelivery. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Arrange ACK_PENDING and the cache overflow via _process_event with a failing durable ack instead of poking the bookkeeping directly, and give the retry budget headroom so eviction surfaces as the actual hazard: a handler replay on redelivery. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Evicting a completed-but-unacked message from the ack-pending map turned redelivery into a full handler replay of already-executed side effects. Ack-pending entries have a bounded exit of their own (each retry either succeeds or the retry budget promotes the message to completed), so the LRU cap on this map was never needed for growth control. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
…r-processes-the-first-message-to-a-INT-969
AlexanderZ-Band
marked this pull request as ready for review
July 22, 2026 09:18
amit-gazal-thenvoi
approved these changes
Jul 23, 2026
…essage-to-a-INT-969
AlexanderZ-Band
deleted the
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July 23, 2026 07:06
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Summary
Prevents freshly joined A2A Gateway peers from processing the first inbound message more than once.
Validation
CI green; 2 live A2A gateway tests passed.