> ## Documentation Index
> Fetch the complete documentation index at: https://docs.nx1cloud.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Evaluate a decision

> Run a decision's published version against an input context.

The publication pointer is resolved once, up front, so the version
and `content_sha` on the response and the audit event are the ones
that actually executed even if a publish lands mid-request.

For understanding *why* a result occurred, use the simulate endpoint
with a trace instead of enabling traces on production traffic.

**Required roles**: `simulator` or above



## OpenAPI

````yaml post /api/decisions/{workspace}/{key}/evaluate
openapi: 3.1.0
info:
  title: Nx1 AI API
  description: |

    AI API for Nx1 Data Platform Management and Automated Data Tasks.

    Authentication is required via PSK in Authorization header.

    Default PSK is | [ask a friend] |
  version: 0.10.2
servers: []
security: []
paths:
  /api/decisions/{workspace}/{key}/evaluate:
    post:
      tags:
        - Decisions
      summary: Evaluate a decision
      description: |-
        Run a decision's published version against an input context.

        The publication pointer is resolved once, up front, so the version
        and `content_sha` on the response and the audit event are the ones
        that actually executed even if a publish lands mid-request.

        For understanding *why* a result occurred, use the simulate endpoint
        with a trace instead of enabling traces on production traffic.

        **Required roles**: `simulator` or above
      operationId: evaluate_api_decisions__workspace___key__evaluate_post
      parameters:
        - name: workspace
          in: path
          required: true
          schema:
            type: string
            maxLength: 64
            pattern: ^[a-z0-9][a-z0-9-]{0,63}$
            description: Workspace slug.
            title: Workspace
          description: Workspace slug.
        - name: key
          in: path
          required: true
          schema:
            type: string
            maxLength: 64
            pattern: ^[a-z0-9][a-z0-9-]{0,63}$
            description: Decision key — a flat slug, never a path.
            title: Key
          description: Decision key — a flat slug, never a path.
        - name: version
          in: query
          required: false
          schema:
            anyOf:
              - type: integer
                minimum: 1
              - type: 'null'
            description: Pin an exact version instead of the published one.
            title: Version
          description: Pin an exact version instead of the published one.
        - name: trace
          in: query
          required: false
          schema:
            type: boolean
            description: Include the node-by-node trace.
            default: false
            title: Trace
          description: Include the node-by-node trace.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/EvaluateRequest'
      responses:
        '200':
          description: Successful Response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/EvaluateResponse'
        '403':
          description: Forbidden
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '404':
          description: Not Found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '422':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
          description: Unprocessable Content
        '503':
          description: Service Unavailable
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
      security:
        - OAuth2AuthorizationCodeBearer: []
        - APIKeyHeader: []
components:
  schemas:
    EvaluateRequest:
      properties:
        context:
          additionalProperties: true
          type: object
          title: Context
          description: Input context passed to the decision graph.
      type: object
      title: EvaluateRequest
    EvaluateResponse:
      properties:
        workspace:
          type: string
          title: Workspace
        key:
          type: string
          title: Key
        version:
          type: integer
          title: Version
        content_sha:
          type: string
          title: Content Sha
        result:
          title: Result
          description: The decision's output.
        performance:
          anyOf:
            - type: string
            - type: 'null'
          title: Performance
        trace:
          anyOf:
            - additionalProperties: true
              type: object
            - type: 'null'
          title: Trace
          description: Node-by-node trace when requested.
        latency_ms:
          type: number
          title: Latency Ms
      type: object
      required:
        - workspace
        - key
        - version
        - content_sha
        - result
        - latency_ms
      title: EvaluateResponse
    ErrorResponse:
      properties:
        error:
          type: string
          title: Error
          description: A brief description of the error that occurred.
        code:
          type: integer
          title: Code
          description: The HTTP status code associated with the error.
          default: 500
      type: object
      required:
        - error
      title: ErrorResponse
  securitySchemes:
    OAuth2AuthorizationCodeBearer:
      type: oauth2
      flows:
        authorizationCode:
          scopes: {}
          authorizationUrl: >-
            https://sso-rapid.rapid.nx1cloud.com/realms/rapid/protocol/openid-connect/auth
          tokenUrl: >-
            https://sso-rapid.rapid.nx1cloud.com/realms/rapid/protocol/openid-connect/token
    APIKeyHeader:
      type: apiKey
      in: header
      name: Authorization-PSK

````