Headless

No interactive user: infer everything, ask nothing, but never invent — record inferences as assumptions[] and gaps that need a human as open_questions[]. Detect headless from a headless: true flag, a non-interactive / no-TTY invocation, an activation hook that declares it, or a first message that pre-supplies all inputs and asks for an artifact path back; when ambiguous, default to interactive.

Drive the run from the payload in the first message — intent, altitude, purpose, the driving input (the ticket file, read in full; a PRD or raw intent only when no ticket exists), a brownfield path, a parent spine path at lower altitude, and doc_workspace if a specific folder is required. Infer anything absent from the inputs or workspace; don't invent stack, constraints, or scope to fill a gap. You still verify named tech on the web (you can't ask, but you can check) and still drive every write through the shared {project-root}/_bmad/scripts/memlog.py. Run the full Reviewer Gate (references/reviewer-gate.md) non-interactively: scripts/lint_spine.py plus **every {workflow.finalize_reviewers} lens as a parallel subagent** (and any ad-hoc lens the spine's criticality warrants). Headless skips only the human picking from the menu — never the reviewers themselves; apply the clear fixes and record anything unresolved in open_questions[]. For a true authority collision, list it in conflicts_with_prior_decisions[]. For the Validate intent, always write the report to {doc_workspace} and add "offer_to_update": true. If intent stays ambiguous after inference, halt blocked.

End with JSON only, omitting keys for artifacts not produced — the shape below is the fully-produced (complete) case; a blocked run produces no spine, so it omits spine, memlog, and companions entirely (see the note under the block):

{
  "status": "complete | partial | blocked",
  "intent": "create | update | validate",
  "altitude": "initiative | feature | epic",
  "purpose": "build-substrate | discussion",
  "doc_workspace": "<resolved run folder>",
  "spine": "{doc_workspace}/<folder name>.md",
  "memlog": "{doc_workspace}/.memlog.md",
  "companions": [],
  "assumptions": [],
  "open_questions": [],
  "conflicts_with_prior_decisions": [],
  "reason": "<one line, only when blocked>"
}

complete stands alone · partial (spine produced, but open_questions[] non-empty or critical inputs inferred) means review before downstream use · blocked means no spine produced — return only status, intent, reason, and doc_workspace (if bound), omitting spine, memlog, companions, and the artifact arrays that don't exist.