docs(checkout-a2a): restate the complete_in_progress freeze for transport parity - #670
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…port parity The `complete_in_progress` update-freeze MUST is stated in the core checkout lifecycle and in the REST, MCP, OpenAPI, and OpenRPC contracts, but the A2A checkout binding does not restate it; it has only a `messageId`-based Request Idempotency section and uses `add_to_checkout` / `complete_checkout` action verbs. An implementer reading only the A2A binding gets no signal about the freeze. Add the freeze to the A2A Request Idempotency section, adapted to the A2A action model: while a Checkout is `complete_in_progress`, the platform MUST NOT send a further checkout-modifying message, and the business agent MUST leave the Checkout unchanged and return a recoverable error.
damaz91
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Problem
The
complete_in_progressupdate-freeze MUST is stated in the core checkout lifecycle and in the REST, MCP, OpenAPI, and OpenRPC contracts, but the A2A checkout binding (docs/specification/checkout-a2a.md) does not restate it. It has only amessageId-based Request Idempotency section and usesadd_to_checkout/complete_checkoutaction verbs, so an implementer reading only the A2A binding gets no signal about the freeze.Fix
Add the freeze to the A2A Request Idempotency section, adapted to the A2A action model: while a Checkout is
complete_in_progress, the platform MUST NOT send a further checkout-modifying message (for exampleadd_to_checkout), and the business agent MUST leave the Checkout unchanged and return a recoverable error Message.Verification
validate_examples.py282 passed (unchanged); spellcheck clean; thecheckout.md#update-checkoutanchor resolves.Raised from #665.