{
  "task_id": "L18",
  "title": "Receipts on every admitted result, with the thin gate attached",
  "repo": "tessera",
  "kind": "build",
  "effect_class": "write-repo",
  "owner_type": "muse-code",
  "done_when": "make suite BACKEND=http passes T15 against a local server",
  "context": [
    "AGENTS.md",
    "conformance-draft/SPEC.md",
    "src/tessera/receipts.py"
  ],
  "constraints": [
    "Read AGENTS.md first; the spec wins over the code",
    "Never edit conformance-draft/ tests or SPEC.md in this task, and never weaken a test",
    "Writes are POST only; a GET on a write path answers 405 and changes nothing",
    "No key, token or credential in any response, page, log or commit",
    "Run make check before committing; one task per branch; do not push"
  ],
  "budget": {
    "max_model_steps": 200,
    "usd": 2.0
  },
  "depends_on": [
    "L8"
  ],
  "branch": "t/L18-receipts-gate"
}