Messaging Adapter Parity

Goal

Prevent adapter-specific regressions by validating behavior contracts across messaging backends.

Contract Areas

• User-visible reply behavior
• Status update behavior (surfaced vs not surfaced)
• Delivery receipt ack/failure semantics
• Retry behavior and bounded backoff
• Error mapping and logging clarity

Parity Checklist

• For every changed adapter path, compare expected behavior with at least one other adapter.
• If an adapter intentionally does not surface a status, ensure receipt handling still converges correctly.
• Ensure unsupported features degrade gracefully and predictably.
• Ensure worker terminal notices cannot loop indefinitely.

Verification Checklist

• Run targeted tests for the touched adapter.
• Run targeted tests for receipt ack/failure paths.
• Run at least one parity comparison check across adapters.
• Run broad gate checks after targeted checks pass.

Required Handoff

• Adapter paths changed
• Contract decisions made
• Receipt behavior outcomes
• Verification evidence
• Residual parity gaps