Every non-2xx answer (contracts/api-conventions.md, "Errors"). Clients branch on code, never on message.
invalid_request: one entry per problem, at a dotted path.
quota_exceeded: the quota that refused the request (contracts/quotas.md, "When a quota is exceeded"). Never with Retry-After.
rate only: an ISO 8601 duration, PT1S to PT1H.
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