{
  "name": "run_cohort",
  "arguments": {
    "endpoint_id": "00000000-0000-0000-0000-000000000001",
    "input": {"text": "hello"},
    "execution": {"mode": "cohort", "fallback": "single", "trace": "summary"},
    "idempotency_key": "candidate-example-0001"
  }
}