Cloudflare Workers AI Clef Decision Models API

openapi: 3.1.0
info:
  title: Cloudflare Workers AI Clef Decision Models API
  description: Workers AI REST surface for Cloudflare's Clef and Clef Flash decision models. Authored
    by API Evangelist from the JSON Schemas Cloudflare publishes for these models; request/response schemas
    are embedded verbatim. Cloudflare does not publish this OpenAPI.
  version: '2026-10-12'
  x-generated-from: schemas
  x-derived-from:
  - https://developers.cloudflare.com/workers-ai/models/clef/schema-input.json
  - https://developers.cloudflare.com/workers-ai/models/clef/schema-output.json
  - https://developers.cloudflare.com/workers-ai/models/clef-flash/schema-input.json
  - https://developers.cloudflare.com/workers-ai/models/clef-flash/schema-output.json
  x-ae-authored:
    by: API Evangelist
    date: '2026-10-12'
    method: OpenAPI wrapper written by hand around verbatim published JSON Schemas; path follows the Workers
      AI REST pattern /accounts/{account_id}/ai/run/{model}.
servers:
- url: https://api.cloudflare.com/client/v4
security:
- bearerAuth: []
tags:
- name: Decision Models
paths:
  /accounts/{account_id}/ai/run/@cf/cloudflare/clef:
    post:
      operationId: runWorkersAiClef
      summary: Run @cf/cloudflare/clef
      description: 'Runs the Workers AI decision model @cf/cloudflare/clef: one state, 1-64 typed questions
        (noul, choice, score), calibrated answers per question.'
      tags:
      - Decision Models
      parameters:
      - name: account_id
        in: path
        required: true
        schema:
          type: string
        description: Cloudflare account identifier.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/ClefInput'
      responses:
        '200':
          description: 'Model output. NOTE (AE): the schema below is the published model output schema;
            the REST endpoint is expected to wrap it in the standard Cloudflare v4 envelope (result/success/errors/messages),
            which the model schema pages do not themselves state.'
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ClefOutput'
  /accounts/{account_id}/ai/run/@cf/cloudflare/clef-flash:
    post:
      operationId: runWorkersAiClefFlash
      summary: Run @cf/cloudflare/clef-flash
      description: 'Runs the Workers AI decision model @cf/cloudflare/clef-flash: one state, 1-64 typed
        questions (noul, choice, score), calibrated answers per question.'
      tags:
      - Decision Models
      parameters:
      - name: account_id
        in: path
        required: true
        schema:
          type: string
        description: Cloudflare account identifier.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/ClefInput'
      responses:
        '200':
          description: 'Model output. NOTE (AE): the schema below is the published model output schema;
            the REST endpoint is expected to wrap it in the standard Cloudflare v4 envelope (result/success/errors/messages),
            which the model schema pages do not themselves state.'
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ClefOutput'
components:
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: Cloudflare API token with Workers AI permission.
  schemas:
    ClefInput:
      type: object
      properties:
        model:
          type: string
          pattern: ^\s*(clef|clef-flash)\s*$
          description: 'Required. The model selector: "clef" for @cf/cloudflare/clef, "clef-flash" for
            @cf/cloudflare/clef-flash.'
        state:
          description: 'Required. The content to evaluate: a string, or structured data (object/array)
            such as records, chat logs, or application state. Long text state is truncated to fit the
            model''s token limit.'
        questions:
          type: object
          description: Map of question id to a typed question (noul, choice, or score). 1 to 64 questions;
            ids may use letters, digits, '_', '.', '-' (max 100 chars). Answers are returned under the
            same ids.
          minProperties: 1
          maxProperties: 64
          additionalProperties:
            oneOf:
            - type: object
              title: Noul
              description: A yes/no question. Returns the probability the answer is yes.
              properties:
                type:
                  type: string
                  enum:
                  - noul
                instructions:
                  description: 'Required. The yes/no question to evaluate: a non-empty string, or an object/array
                    that holds the question in one field and referenced data in others.'
                criteria:
                  type: object
                  description: Optional descriptions of what a yes and a no mean.
                  properties:
                    'true':
                      description: What a yes (value near 1) means.
                    'false':
                      description: What a no (value near 0) means.
              required:
              - type
              - instructions
            - type: object
              title: Choice
              description: Pick one option from a set you define. Returns the chosen option, a probability
                per option, and confidence.
              properties:
                type:
                  type: string
                  enum:
                  - choice
                instructions:
                  description: 'Required. What the model should decide: a non-empty string, or an object/array
                    holding the question and referenced data.'
                criteria:
                  type: object
                  description: 'Map of option id (non-empty string) to its description: string, object,
                    array, or null when no detail is needed. 2 to 255 options.'
                  additionalProperties: {}
              required:
              - type
              - instructions
              - criteria
            - type: object
              title: Score
              description: Rate the state on an ordered rubric. Returns a probability-weighted score,
                a probability per level, and confidence.
              properties:
                type:
                  type: string
                  enum:
                  - score
                instructions:
                  description: 'Required. What the model should rate: a non-empty string, or an object/array
                    holding the question and referenced data.'
                criteria:
                  type: array
                  description: Ordered level descriptions (string, object, or array), lowest first; levels
                    are indexed from 0. 2 to 10 levels.
                  minItems: 2
                  maxItems: 10
                  items: {}
              required:
              - type
              - instructions
              - criteria
        images:
          type: array
          description: Clef extension to the System One API. Optional embedded PNG, JPEG, or WebP images
            placed before the state (max 4; 4 MiB and 16 megapixels each, 8 MiB total decoded; whole request
            body max 13 MiB). Remote URLs are not accepted.
          maxItems: 4
          items:
            anyOf:
            - type: string
              title: Data URL
              description: 'A base64 data URL: data:image/png;base64,..., data:image/jpeg;base64,...,
                or data:image/webp;base64,...'
              pattern: '^[Dd][Aa][Tt][Aa]:'
            - type: object
              title: Base64 image
              properties:
                content_type:
                  type: string
                  description: image/png, image/jpeg, or image/webp.
                base64:
                  type: string
                  description: Base64-encoded image bytes.
              required:
              - content_type
              - base64
      required:
      - model
      - state
      - questions
    ClefOutput:
      type: object
      contentType: application/json
      properties:
        model:
          type: string
          description: The model that performed the evaluation.
        answers:
          type: object
          description: One answer per question, keyed by the question ids from the request.
          additionalProperties:
            oneOf:
            - type: object
              title: Noul answer
              properties:
                type:
                  type: string
                  enum:
                  - noul
                noul:
                  type: number
                  minimum: 0
                  maximum: 1
                  description: Probability the answer is yes.
              required:
              - type
              - noul
            - type: object
              title: Choice answer
              properties:
                type:
                  type: string
                  enum:
                  - choice
                choice:
                  type: string
                  description: The highest-probability option.
                probabilities:
                  type: object
                  description: Probability per option/level; values sum to 1.
                  additionalProperties:
                    type: number
                    minimum: 0
                    maximum: 1
                confidence:
                  type: number
                  minimum: 0
                  maximum: 1
                  description: How certain the model is, derived from the probabilities.
              required:
              - type
              - choice
              - probabilities
              - confidence
            - type: object
              title: Score answer
              properties:
                type:
                  type: string
                  enum:
                  - score
                score:
                  type: number
                  description: Probability-weighted level; can land between levels.
                legend:
                  type: object
                  description: Level index (string) mapped to its description.
                  additionalProperties: {}
                probabilities:
                  type: object
                  description: Probability per option/level; values sum to 1.
                  additionalProperties:
                    type: number
                    minimum: 0
                    maximum: 1
                confidence:
                  type: number
                  minimum: 0
                  maximum: 1
                  description: How certain the model is, derived from the probabilities.
              required:
              - type
              - score
              - legend
              - probabilities
              - confidence
        usage:
          type: object
          properties:
            input_tokens:
              type: integer
            output_tokens:
              type: integer
          required:
          - input_tokens
          - output_tokens
      required:
      - model
      - answers
      - usage