{
  "version": 1,
  "description": "Cross-language contract fixture for the chat goal state. When auto-continue stands down, the worker stores one of stand_down_reason_codes in goal.last_evaluation.stand_down_reason (backend/packages/harness/deerflow/runtime/runs/worker.py); check_failure_codes are the ones where the goal could not be checked. Clearing a met goal writes the goal_outcome channel in the same checkpoint, and every other goal write removes it (runtime/goal.py write_thread_goal); clients cannot write it. The POST /api/threads/{thread_id}/history head carries at most history_head_keys, projecting goal only while it is active and goal_outcome only when achieved. host_reason_texts are the English last_evaluation.reason values the host writes itself instead of the evaluator; the evaluator_failed reason embeds an exception type name and is covered by check_failure_codes. The frontend reads the same file so it never shows a raw code and never labels host text as the evaluator's.",
  "stand_down_reason_codes": [
    "blocked:missing_evidence",
    "blocked:needs_user_input",
    "blocked:run_failed",
    "blocked:external_wait",
    "max_continuations_reached",
    "no_progress_detected",
    "token_capped",
    "loop_capped",
    "evaluator_failed",
    "no_durable_end_of_turn",
    "thread_changed_after_evaluation",
    "thread_changed_before_continuation"
  ],
  "check_failure_codes": [
    "evaluator_failed",
    "no_durable_end_of_turn",
    "thread_changed_after_evaluation",
    "thread_changed_before_continuation"
  ],
  "goal_outcome": {
    "channel": "goal_outcome",
    "statuses": ["achieved"],
    "keys": [
      "status",
      "objective",
      "goal_created_at",
      "achieved_at",
      "continuation_count",
      "max_continuations",
      "reason",
      "relied_on_assumption",
      "reply_message_id"
    ]
  },
  "history_head_keys": ["title", "thread_data", "messages", "goal", "goal_outcome"],
  "host_reason_texts": [
    "No visible assistant evidence is available yet.",
    "The turn ended on a question to the user that has not been answered.",
    "No durable assistant end-of-turn receipt was available."
  ]
}