openapi: 3.1.0
info:
  title: Gradient Labs Actions & Tools Messages API
  version: '1.0'
  description: 'HTTP API for Gradient Labs'' AI customer support agent ("Otto"). Use it to start and drive support conversations, add customer and human-agent messages, assign work to the AI agent, hand off to humans, run business tools/actions, and manage the knowledge base the agent reasons over.


    All requests are authenticated with a Bearer API key in the `Authorization` header. Unless stated otherwise, endpoints are idempotent and requests can be safely retried.


    IMPORTANT (accuracy note): Gradient Labs'' public API reference at https://api-docs.gradient-labs.ai/ is behind an access-code gate. The paths, verbs, and field names in this document were reconstructed from the vendor''s official open-source Go SDK (github.com/gradientlabs-ai/gradientlabs-go) and corroborating SDKs. Request/response schemas are modeled and simplified; verify exact field-level shapes against the gated reference before relying on them in production. See review.yml (endpointsConfirmed vs endpointsModeled).'
  contact:
    name: Gradient Labs
    url: https://www.gradient-labs.ai
  license:
    name: Proprietary
servers:
- url: https://api.gradient-labs.ai
  description: Gradient Labs production API
security:
- bearerAuth: []
tags:
- name: Messages
  description: Add inbound messages to a conversation.
paths:
  /conversations/{conversationID}/messages:
    post:
      tags:
      - Messages
      operationId: addMessage
      summary: Add a message to a conversation
      description: Adds an inbound message (from the customer or a human agent) to a conversation for the AI agent to process. The participant type cannot be the AI agent.
      parameters:
      - $ref: '#/components/parameters/ConversationID'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/AddMessageParams'
      responses:
        '200':
          description: Message accepted.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Message'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
components:
  responses:
    NotFound:
      description: Resource not found.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    Unauthorized:
      description: Missing or invalid API key.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  parameters:
    ConversationID:
      name: conversationID
      in: path
      required: true
      description: Your unique identifier for the conversation.
      schema:
        type: string
  schemas:
    Error:
      type: object
      properties:
        error:
          type: string
        message:
          type: string
    Message:
      type: object
      properties:
        id:
          type: string
        body:
          type: string
        subject:
          type: string
        participant_id:
          type: string
        participant_type:
          $ref: '#/components/schemas/ParticipantType'
        created:
          type: string
          format: date-time
        attachments:
          type: array
          items:
            $ref: '#/components/schemas/Attachment'
        conversation_token:
          type: string
    Attachment:
      type: object
      properties:
        id:
          type: string
        filename:
          type: string
        url:
          type: string
          format: uri
        content_type:
          type: string
    ParticipantType:
      type: string
      description: The type of participant in a conversation.
      enum:
      - ai-agent
      - customer
      - human-agent
    AddMessageParams:
      type: object
      required:
      - id
      - body
      - participant_id
      - participant_type
      properties:
        id:
          type: string
          description: Unique message identifier (letters, numbers and _ - + = characters).
        body:
          type: string
          description: The message text.
        subject:
          type: string
          description: Email subject line, when applicable.
        participant_id:
          type: string
          description: Identifier of the sender.
        participant_type:
          $ref: '#/components/schemas/ParticipantType'
        created:
          type: string
          format: date-time
        attachments:
          type: array
          items:
            $ref: '#/components/schemas/Attachment'
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: Provide your Gradient Labs API key as a Bearer token in the Authorization header. Some administrative endpoints (tools) require a Management API key.