D-ID Chat API

openapi: 3.0.3
info:
  title: D-ID Agents Chat API
  description: 'API for creating and managing interactive real-time AI agents that combine digital avatar streaming with large language models, RAG-based knowledge bases, and custom tools. Supports WebRTC and LiveKit-powered streaming sessions, conversation memory, chat export, and integration with third-party LLM providers. Enables face-to-face AI conversations at scale.

    '
  version: 1.0.0
  contact:
    url: https://www.d-id.com
  termsOfService: https://www.d-id.com/terms-of-use/
servers:
- url: https://api.d-id.com
  description: D-ID Production API
security:
- basicAuth: []
- bearerAuth: []
tags:
- name: Chat
  description: Send messages and receive responses in an agent chat
paths:
  /agents/{agentId}/chat/{chatId}:
    post:
      operationId: agentchat
      summary: Send a chat message
      description: 'Send a message to an agent''s chat and receive a response including optional knowledge matches, video ID, and chat mode.

        '
      tags:
      - Chat
      security:
      - basicAuth: []
      - bearerAuth: []
      - clientKeyAuth: []
      parameters:
      - name: agentId
        in: path
        required: true
        description: Agent identifier.
        schema:
          type: string
      - name: chatId
        in: path
        required: true
        description: Chat identifier.
        schema:
          type: string
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/ChatMessageRequest'
      responses:
        '200':
          description: Chat response.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ChatMessageResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
components:
  responses:
    Unauthorized:
      description: Authentication failure.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/JsonError'
          example:
            kind: AuthorizationError
            description: user unauthenticated
  schemas:
    ChatMessage:
      type: object
      properties:
        role:
          type: string
          enum:
          - user
          - assistant
          - system
        content:
          type: string
        created_at:
          type: string
          format: date-time
    ChatMessageResponse:
      type: object
      properties:
        matches:
          type: array
          items:
            $ref: '#/components/schemas/KnowledgeMatch'
          description: Relevant knowledge base matches.
        documentIds:
          type: array
          items:
            type: string
        result:
          type: string
          description: Text response from the agent.
        chatMode:
          type: string
        videoId:
          type: string
          description: ID of the generated avatar video response.
    KnowledgeMatch:
      type: object
      properties:
        id:
          type: string
        data:
          type: string
        title:
          type: string
        document_id:
          type: string
        knowledge_id:
          type: string
        source_url:
          type: string
          format: uri
    JsonError:
      type: object
      properties:
        kind:
          type: string
          example: AuthorizationError
        description:
          type: string
          example: user unauthenticated
    ChatMessageRequest:
      type: object
      required:
      - messages
      properties:
        messages:
          type: array
          items:
            $ref: '#/components/schemas/ChatMessage'
          description: Conversation messages. Must contain at least one message.
        streamId:
          type: string
          description: Optional stream ID to link video response.
        sessionId:
          type: string
          description: Optional session ID for WebRTC stream.
        chatMode:
          type: string
          enum:
          - Functional
          - TextOnly
          - Maintenance
          - Playground
          description: Chat operating mode (Playground deprecated).
  securitySchemes:
    basicAuth:
      type: http
      scheme: basic
      description: HTTP Basic Authentication using API key as username.
    bearerAuth:
      type: http
      scheme: bearer
      description: Bearer token authentication.
    clientKeyAuth:
      type: apiKey
      in: header
      name: Authorization
      description: Scoped client key for SDK embedding.
externalDocs:
  description: D-ID Agents API Reference
  url: https://docs.d-id.com/reference/agents