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The clef driver connects Polyglot Decision to Cloudflare’s hosted Clef and Clef-flash decision models on Workers AI. Both speak the System One protocol: a state plus a map of typed noul, choice, and score questions in, one probability distribution per question out. Output tokens are not billed.

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Configure the driver

Set the Cloudflare account ID and an API token with Workers AI access:
Then select one of the bundled presets:
Both presets target https://api.cloudflare.com/client/v4/accounts/{account}/ai with the endpoint /run/@cf/cloudflare/{model}. The driver substitutes the effective model into {model}, so a per-request model override changes both the URL route and the model field of the body.

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Protocol notes

  • Every question needs instructions. The driver rejects a question without them before sending the request.
  • Clef accepts 1 to 64 questions, 2 to 255 Choice options, and 2 to 10 Score levels. Text, object, and list state keep their System One shape.
  • Cloudflare wraps results in a {result, success, errors, messages} envelope. The adapter unwraps it, fails closed when success is not true, and also accepts an unwrapped System One body.
  • The cf-ray response header becomes the provider request ID.
  • Probabilities are returned rounded to four decimals, so the adapter checks distribution sums and probability-weighted scores with a 0.02 tolerance.
  • The optional Clef images extension is not exposed by the Decision API.
HTTP 401 and 403 map to authentication errors, 429 to rate limits, 408 and 5xx to retriable transient errors, and other 4xx responses to invalid requests. The first request to a cold model can take close to a minute, so allow a generous request timeout.

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Live smoke

The test runs one mixed Noul, Choice, and Score decision against both presets and needs CLOUDFLARE_ACCOUNT_ID and CLOUDFLARE_API_TOKEN in the environment.