Rattlewatch

US product recall lookup for AI agents — CPSC consumer products and FDA food, drug and device enforcement, with every result pinned to an official source.

The point is not that it searches; it is that it refuses to answer without a citation. Ask it something it has no record of and it says so, rather than inventing a plausible answer.

Live API: https://rattlewatch.rattled.ca MCP endpoint: https://rattlewatch.rattled.ca/mcp Interactive docs: https://rattlewatch.rattled.ca/docs

Machine-readable discovery, for agents rather than browsers:

One container serves both surfaces — the REST API and MCP over streamable HTTP at /mcp. That matters for registry discovery: directories introspect the image's default command, so it has to be a working MCP server.

curl "https://rattlewatch.rattled.ca/v1/recalls/search?q=Bistro%20Pro%20Electric%20Grill"

Rattlewatch answers the questions an agent cannot safely answer itself:

• Is this product, brand, or model number subject to a recall?
• Which agency published that recall, and where is the source?
• What recalls or rule changes appeared since a given date?

Every answer carries an official source URL and a last-verified date. Rattlewatch never generates an answer — it returns records that exist in its store, or it says "no verified record". Absence is an honest negative, not a guess.

The trust guarantee

An answer without a citation does not ship.

• Cited — every fact and recall is pinned to an official source (CPSC, EUR-Lex, ECHA, the European Commission, OEHHA).
• Versioned — facts are append-only. A changed answer creates a new version and a change event, never an in-place edit.
• Current — the store is re-verified against its upstream sources on a schedule; verified_at tells you exactly when.
• Non-generative — verify() returns only matching records. If nothing matches, it returns found: false with an explicit reason. It will not invent one.

Tools (MCP)

Data coverage

• Recalls — the full structured U.S. CPSC feed (consumer products) plus openFDA enforcement reports for food, drug and device. Every record carries a resolvable source URL: the official CPSC page, or a per-record openFDA query.
• Requirements — a small curated set of cited market-entry facts, seven in total: CPSIA/Children's Product Certificate, CPSC eFiling, EU GPSR, CE marking, REACH SVHCs, RoHS, and California Prop 65 — each with a verbatim citation. This is a companion to the recall data, not a regulatory database.

python -m rattlewatch build --max-recalls 5000 --fda-limit 3000   # default in the image
python -m rattlewatch build --fda-limit 0                          # CPSC only (used by CI)

The engine is domain-agnostic: new markets (UK, CA, AU, JP, and beyond) and new rule sets are added as more cited facts and feeds are compiled, without code change.

Quick start

python -m venv .venv && .venv/Scripts/activate   # or: source .venv/bin/activate
pip install -r requirements.txt

# build the store (facts + CPSC recalls)
python -m rattlewatch build

# run as an MCP server over stdio (local agents)
python -m rattlewatch mcp

# or serve the REST API + MCP over HTTP
python -m rattlewatch serve --host 0.0.0.0 --port 8000

Connect a client

{
  "mcpServers": {
    "rattlewatch": {
      "command": "python",
      "args": ["-m", "rattlewatch", "mcp"],
      "cwd": "/path/to/rattlewatch"
    }
  }
}

REST API

Interactive docs: /docs.

Pricing

Free discovery and lookups, metered premium calls. The premium endpoint implements the x402 payment flow: the server returns 402 Payment Required with a structured payment requirement, and a paying agent retries with proof of payment. This is the monetization thesis in one endpoint — agents discover, agents pay. The payment rail (x402/USDC or Stripe metered billing) is wired at deploy time.

Repository

rattlewatch/
  rattlewatch/
    store.py      # ground-truth store (facts, recalls, events, sources)
    compile.py    # ingest CPSC + cited rules
    engine.py     # query logic (search, verify, change feed)
    textutil.py   # normalization + matching primitives
    mcp_server.py # MCP server (stdio + streamable HTTP)
    api.py        # FastAPI REST + x402 stub
    __main__.py   # CLI: build / stats / serve / mcp
  data/rules/seed.yaml   # cited facts
  tests/test_engine.py   # correctness + no-hallucination tests

Why this matters

AI generates infinite plausible text for free, so content is worth nothing. But AI hallucinates — especially on current rules, specific numbers, and what changed last week. Rattlewatch is the opposite of a generative model: a small, boring, cited layer of truth that agents and the software they power can depend on when being wrong is expensive.

Security

See SECURITY.md for the full threat model, the implemented controls, and — listed explicitly — what is not protected. Every claim there is backed by a test in tests/test_api.py.

Highlights: query input bounded at two independent layers; per-client rate limiting; API keys compared in constant time that fail closed; CORS denied by default; hardened response headers; no stack-trace leakage; container runs as an unprivileged user (UID 10001).

Testing

export PYTHONPATH=.
python tests/test_engine.py   # 13 checks — correctness + non-hallucination
python tests/test_api.py      # 30 checks — security + abuse

See TESTING.md for the coverage map and an explicit list of what is not tested. A green run is not the same as "verified secure."

License

MIT — see LICENSE.

The code is open source; the hosted service is the product. Nothing about the moat lives in the source: the defensible asset is the curated, daily-refreshed, cited corpus and the freshness pipeline that maintains it. Open-sourcing the code also means the citation machinery is auditable — which matters for a product whose entire claim is that its answers can be trusted.

You can self-host it:

docker build -t rattlewatch .
docker run -p 8000:8000 rattlewatch

Or use the hosted endpoint: https://rattlewatch.rattled.ca