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Compass Engineering Docs

DL-475

A stale post returns a stale_post arm on PostMessageResponse with the oldest 20 unseen messages; idempotent retries win first, a non-locking pre-check runs only where the cost gate would hold, a confirm re-sends the current view, the render is body-budgeted, refused ids are deduplicated against later delivery, and tools never auto-retry

Status: Active (proposed, pending Matt, 2026-10-11)

Record: ../../agent/compass-topic-write-locks/design.md#q4-what-a-refused-post-returns