openapi: 3.0.1
info:
  title: Klu Actions API
  description: 'REST API for the Klu (klu.ai) LLM app platform. The Klu Engine runs Actions - each encapsulating a prompt template, model config, context (RAG), and output parsing - against input variables to generate completions, and manages the data, feedback, sessions, models, apps, and workspaces around them. Authentication is via a Bearer API key obtained from the workspace API Keys settings.

    NOTE - Endpoints under the Actions, Context, and Apps/Workspaces paths reflect the publicly documented Klu API reference and SDK surface. Where the public docs document a capability via the SDK but do not publish the exact REST path, this spec models the conventional resource path used by the Klu Engine; see review.yml for which operations are documented verbatim versus inferred from the SDK.'
  termsOfService: https://klu.ai/terms
  contact:
    name: Klu Support
    url: https://help.klu.ai/
  version: '1.0'
servers:
- url: https://api.klu.ai/v1
  description: Klu Engine production API
security:
- bearerAuth: []
tags:
- name: Actions
  description: Run Actions to generate completions.
paths:
  /actions:
    post:
      operationId: runAction
      tags:
      - Actions
      summary: Run an Action
      description: Executes a Klu Action by GUID against the provided input, returning the generated completion and a feedback URL containing the data point GUID. Supports streaming, async execution, response caching, session memory, context metadata filtering, and experiments.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/RunActionRequest'
      responses:
        '200':
          description: Generation result.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/RunActionResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '429':
          $ref: '#/components/responses/RateLimited'
components:
  responses:
    Unauthorized:
      description: Missing or invalid API key.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    RateLimited:
      description: Too many requests.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  schemas:
    RunActionResponse:
      type: object
      properties:
        msg:
          type: string
          description: The generated completion text.
        feedback_url:
          type: string
          description: URL containing the data point GUID for submitting feedback on this generation.
        stream_url:
          type: string
          description: Token streaming endpoint, present when streaming is enabled.
        data_guid:
          type: string
          description: GUID of the data point recorded for this generation.
    RunActionRequest:
      type: object
      required:
      - action
      - input
      properties:
        action:
          type: string
          description: GUID of the Action to run.
        input:
          description: Input string, or an object of key-value variable pairs for the prompt template.
          oneOf:
          - type: string
          - type: object
            additionalProperties: true
        streaming:
          type: boolean
          description: Stream the response token by token.
          default: false
        async_mode:
          type: boolean
          description: Execute asynchronously and return a generation GUID to retrieve results later.
          default: false
        cache:
          type: boolean
          description: Return a cached response when an equivalent generation is available.
          default: false
        session:
          type: string
          description: Session GUID to use for conversational context.
        metadata_filter:
          type: object
          additionalProperties: true
          description: Filter Context documents by metadata attributes.
        experiment:
          type: string
          description: Experiment GUID for A/B testing.
    Error:
      type: object
      properties:
        error:
          type: string
        message:
          type: string
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: Klu API key passed as a Bearer token in the Authorization header.