Status and result of a job

Present when status=failed. Carries { code, message, details? }. Terminal code values include BYO_PROVIDER_REQUIRED, BYO_PROVIDER_ACCOUNT_ERROR (YOUR engine rejected the request for an ACCOUNT reason — exhausted credit, revoked key, quota, model access; details carries reason and provider. Nexus never falls back to another engine and never substitutes a verdict your engine did not emit: fix the account and retry), OUTPUT_WITHHELD_BY_POLICY (delegated enforcement; details follows WithholdDetails, no credits charged), and KEY_REVOKED_DURING_REQUEST (the API/sub-key was revoked or expired mid-job — parity with the sync 401 KEY_REVOKED_DURING_REQUEST).

Result payload; its shape follows kind. For kind=debate it carries analysis, arbiter, tiers, rounds, citationAudit, jurisdiction and panel. panel = { requested, participated, arbitrated, degraded } and states how many models the deliverable was ACTUALLY built on. It matters because tiers lists the panel that was CONVENED and rounds the rounds that were run — neither drops when a debater fails, so a 2-model debate reached you shaped exactly like a 3-model one. Check panel.degraded before presenting the output as a full adversarial panel: true means participated < requested (fewer independent analyses) and/or arbitrated: false (the arbiter emitted no synthesis, so analysis is a SINGLE model's text, not the panel's reconciled result). The same warning is also prepended INSIDE analysis, in the analysis language, so it survives PDF export and copy-paste — the JSON metadata does not. panel is a NEW optional object, never a new value in a published enum. Engine failures do not land here: if YOUR BYO engine fails for an account reason the job terminates as failed with error.code: BYO_PROVIDER_ACCOUNT_ERROR instead of quietly delivering a smaller panel.