ElevenLabs Conversational AI API

openapi: 3.1.0
info:
  title: ElevenLabs Conversational AI API
  description: >-
    The ElevenLabs Conversational AI API enables developers to build
    interactive voice agents that can engage in natural, real-time
    conversations. It provides REST endpoints for managing agents,
    conversations, knowledge bases, tools, and phone number integrations.
    The API supports multi-turn dialogue across 70+ languages and is
    designed for building customer service agents, voice assistants, and
    interactive voice response systems.
  version: '1.0'
  contact:
    name: ElevenLabs Support
    url: https://help.elevenlabs.io
  termsOfService: https://elevenlabs.io/terms-of-service
externalDocs:
  description: ElevenLabs Conversational AI Documentation
  url: https://elevenlabs.io/docs/overview/capabilities/conversational-ai
servers:
  - url: https://api.elevenlabs.io
    description: Production Server
tags:
  - name: Agents
    description: >-
      Endpoints for creating, managing, and configuring conversational AI
      agents with voice capabilities.
  - name: Conversations
    description: >-
      Endpoints for retrieving and managing conversation sessions and
      their associated data.
  - name: Knowledge Base
    description: >-
      Endpoints for managing knowledge base documents that agents use to
      answer questions.
  - name: Tools
    description: >-
      Endpoints for managing external tools and webhook integrations that
      agents can invoke during conversations.
security:
  - apiKeyAuth: []
paths:
  /v1/convai/agents:
    get:
      operationId: listAgents
      summary: List agents
      description: >-
        Returns a list of all conversational AI agents and their metadata
        for the authenticated account.
      tags:
        - Agents
      parameters:
        - name: page_size
          in: query
          required: false
          description: >-
            Number of agents to return per page.
          schema:
            type: integer
            default: 30
        - name: cursor
          in: query
          required: false
          description: >-
            Pagination cursor for retrieving the next page of results.
          schema:
            type: string
      responses:
        '200':
          description: List of agents retrieved successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/AgentListResponse'
        '401':
          description: Unauthorized - invalid or missing API key
    post:
      operationId: createAgent
      summary: Create agent
      description: >-
        Creates a new conversational AI agent from a configuration object
        specifying the agent's behavior, voice, language model, and
        available tools.
      tags:
        - Agents
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CreateAgentRequest'
      responses:
        '200':
          description: Agent created successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/AgentResponse'
        '400':
          description: Bad request - invalid configuration
        '401':
          description: Unauthorized - invalid or missing API key
        '422':
          description: Unprocessable entity - validation error
  /v1/convai/agents/{agent_id}:
    get:
      operationId: getAgent
      summary: Get agent
      description: >-
        Retrieves the full configuration and metadata for a specific
        conversational AI agent.
      tags:
        - Agents
      parameters:
        - $ref: '#/components/parameters/agentId'
      responses:
        '200':
          description: Agent configuration retrieved successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Agent'
        '401':
          description: Unauthorized - invalid or missing API key
        '404':
          description: Agent not found
    patch:
      operationId: updateAgent
      summary: Update agent
      description: >-
        Updates the configuration of an existing conversational AI agent.
        Only the provided fields are updated; unspecified fields retain
        their current values.
      tags:
        - Agents
      parameters:
        - $ref: '#/components/parameters/agentId'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/UpdateAgentRequest'
      responses:
        '200':
          description: Agent updated successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/AgentResponse'
        '400':
          description: Bad request - invalid configuration
        '401':
          description: Unauthorized - invalid or missing API key
        '404':
          description: Agent not found
    delete:
      operationId: deleteAgent
      summary: Delete agent
      description: >-
        Deletes a conversational AI agent and all its associated
        configuration. This action is irreversible.
      tags:
        - Agents
      parameters:
        - $ref: '#/components/parameters/agentId'
      responses:
        '200':
          description: Agent deleted successfully
        '401':
          description: Unauthorized - invalid or missing API key
        '404':
          description: Agent not found
  /v1/convai/agents/{agent_id}/simulate:
    post:
      operationId: simulateConversation
      summary: Simulate conversation
      description: >-
        Runs a simulated conversation between the agent and a simulated
        user for testing purposes. Returns the full conversation transcript
        and evaluation metrics.
      tags:
        - Agents
      parameters:
        - $ref: '#/components/parameters/agentId'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/SimulateConversationRequest'
      responses:
        '200':
          description: Simulation completed successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SimulationResult'
        '400':
          description: Bad request - invalid parameters
        '401':
          description: Unauthorized - invalid or missing API key
        '404':
          description: Agent not found
  /v1/convai/conversations:
    get:
      operationId: listConversations
      summary: List conversations
      description: >-
        Returns a list of conversations for the authenticated account,
        optionally filtered by agent identifier.
      tags:
        - Conversations
      parameters:
        - name: agent_id
          in: query
          required: false
          description: >-
            Filter conversations by agent identifier.
          schema:
            type: string
        - name: page_size
          in: query
          required: false
          description: >-
            Number of conversations to return per page.
          schema:
            type: integer
            default: 30
        - name: cursor
          in: query
          required: false
          description: >-
            Pagination cursor for the next page.
          schema:
            type: string
      responses:
        '200':
          description: List of conversations retrieved successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ConversationListResponse'
        '401':
          description: Unauthorized - invalid or missing API key
  /v1/convai/conversations/{conversation_id}:
    get:
      operationId: getConversation
      summary: Get conversation
      description: >-
        Retrieves the full details of a conversation including the
        transcript, metadata, and analysis.
      tags:
        - Conversations
      parameters:
        - $ref: '#/components/parameters/conversationId'
      responses:
        '200':
          description: Conversation details retrieved successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Conversation'
        '401':
          description: Unauthorized - invalid or missing API key
        '404':
          description: Conversation not found
    delete:
      operationId: deleteConversation
      summary: Delete conversation
      description: >-
        Deletes a conversation and its associated data.
      tags:
        - Conversations
      parameters:
        - $ref: '#/components/parameters/conversationId'
      responses:
        '200':
          description: Conversation deleted successfully
        '401':
          description: Unauthorized - invalid or missing API key
        '404':
          description: Conversation not found
  /v1/convai/conversations/{conversation_id}/audio:
    get:
      operationId: getConversationAudio
      summary: Get conversation audio
      description: >-
        Downloads the audio recording of a conversation session.
      tags:
        - Conversations
      parameters:
        - $ref: '#/components/parameters/conversationId'
      responses:
        '200':
          description: Conversation audio file
          content:
            audio/mpeg:
              schema:
                type: string
                format: binary
        '401':
          description: Unauthorized - invalid or missing API key
        '404':
          description: Conversation audio not found
  /v1/convai/knowledge-base:
    get:
      operationId: listKnowledgeBase
      summary: List knowledge base documents
      description: >-
        Returns a list of knowledge base documents available for use by
        conversational AI agents.
      tags:
        - Knowledge Base
      responses:
        '200':
          description: Knowledge base documents listed successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/KnowledgeBaseListResponse'
        '401':
          description: Unauthorized - invalid or missing API key
    post:
      operationId: addKnowledgeBaseDocument
      summary: Add knowledge base document
      description: >-
        Uploads a document to the knowledge base for use by conversational
        AI agents. Supported formats include PDF, TXT, and web URLs.
      tags:
        - Knowledge Base
      requestBody:
        required: true
        content:
          multipart/form-data:
            schema:
              $ref: '#/components/schemas/AddKnowledgeBaseRequest'
      responses:
        '200':
          description: Document added successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/KnowledgeBaseDocument'
        '400':
          description: Bad request - invalid document
        '401':
          description: Unauthorized - invalid or missing API key
  /v1/convai/knowledge-base/{document_id}:
    delete:
      operationId: deleteKnowledgeBaseDocument
      summary: Delete knowledge base document
      description: >-
        Removes a document from the knowledge base.
      tags:
        - Knowledge Base
      parameters:
        - name: document_id
          in: path
          required: true
          description: >-
            The identifier of the document to delete.
          schema:
            type: string
      responses:
        '200':
          description: Document deleted successfully
        '401':
          description: Unauthorized - invalid or missing API key
        '404':
          description: Document not found
  /v1/convai/knowledge-base/{document_id}/dependent-agents:
    get:
      operationId: getDependentAgents
      summary: Get dependent agents
      description: >-
        Returns a list of agents that depend on a specific knowledge base
        document.
      tags:
        - Knowledge Base
      parameters:
        - name: document_id
          in: path
          required: true
          description: >-
            The identifier of the knowledge base document.
          schema:
            type: string
      responses:
        '200':
          description: Dependent agents retrieved successfully
          content:
            application/json:
              schema:
                type: object
                properties:
                  agents:
                    type: array
                    items:
                      $ref: '#/components/schemas/AgentSummary'
        '401':
          description: Unauthorized - invalid or missing API key
        '404':
          description: Document not found
  /v1/convai/tools:
    get:
      operationId: listTools
      summary: List tools
      description: >-
        Returns a list of tools configured for use by conversational AI
        agents, including webhook and MCP server integrations.
      tags:
        - Tools
      responses:
        '200':
          description: Tools listed successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ToolListResponse'
        '401':
          description: Unauthorized - invalid or missing API key
    post:
      operationId: createTool
      summary: Create tool
      description: >-
        Creates a new tool that agents can invoke during conversations.
        Tools can be webhook endpoints that connect to external services
        for real-time data retrieval or action execution.
      tags:
        - Tools
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CreateToolRequest'
      responses:
        '200':
          description: Tool created successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Tool'
        '400':
          description: Bad request - invalid configuration
        '401':
          description: Unauthorized - invalid or missing API key
  /v1/convai/tools/{tool_id}:
    delete:
      operationId: deleteTool
      summary: Delete tool
      description: >-
        Deletes a tool configuration.
      tags:
        - Tools
      parameters:
        - name: tool_id
          in: path
          required: true
          description: >-
            The identifier of the tool to delete.
          schema:
            type: string
      responses:
        '200':
          description: Tool deleted successfully
        '401':
          description: Unauthorized - invalid or missing API key
        '404':
          description: Tool not found
components:
  securitySchemes:
    apiKeyAuth:
      type: apiKey
      in: header
      name: xi-api-key
      description: >-
        ElevenLabs API key passed in the xi-api-key header for authentication.
  parameters:
    agentId:
      name: agent_id
      in: path
      required: true
      description: >-
        The unique identifier of the conversational AI agent.
      schema:
        type: string
    conversationId:
      name: conversation_id
      in: path
      required: true
      description: >-
        The unique identifier of the conversation.
      schema:
        type: string
  schemas:
    AgentListResponse:
      type: object
      properties:
        agents:
          type: array
          description: >-
            List of agents.
          items:
            $ref: '#/components/schemas/AgentSummary'
        has_more:
          type: boolean
          description: >-
            Whether there are more agents available.
        next_cursor:
          type: string
          description: >-
            Cursor for retrieving the next page.
    AgentSummary:
      type: object
      properties:
        agent_id:
          type: string
          description: >-
            Unique identifier for the agent.
        name:
          type: string
          description: >-
            Display name of the agent.
        created_at:
          type: string
          format: date-time
          description: >-
            Timestamp when the agent was created.
    Agent:
      type: object
      properties:
        agent_id:
          type: string
          description: >-
            Unique identifier for the agent.
        name:
          type: string
          description: >-
            Display name of the agent.
        conversation_config:
          $ref: '#/components/schemas/ConversationConfig'
        created_at:
          type: string
          format: date-time
          description: >-
            Timestamp when the agent was created.
        metadata:
          type: object
          description: >-
            Additional metadata associated with the agent.
          additionalProperties:
            type: string
    ConversationConfig:
      type: object
      description: >-
        Configuration defining the agent's conversational behavior,
        voice settings, and language model parameters.
      properties:
        agent:
          type: object
          description: >-
            Agent behavior configuration.
          properties:
            prompt:
              type: object
              description: >-
                The system prompt and instructions for the agent.
              properties:
                prompt:
                  type: string
                  description: >-
                    The system instructions that define agent behavior.
            first_message:
              type: string
              description: >-
                The initial message the agent sends when a conversation
                starts.
            language:
              type: string
              description: >-
                The primary language for the agent.
        tts:
          type: object
          description: >-
            Text-to-speech configuration for the agent's voice.
          properties:
            voice_id:
              type: string
              description: >-
                The voice to use for the agent's speech output.
            model_id:
              type: string
              description: >-
                The TTS model to use.
        stt:
          type: object
          description: >-
            Speech-to-text configuration for processing user input.
          properties:
            model_id:
              type: string
              description: >-
                The STT model to use for transcription.
        llm:
          type: object
          description: >-
            Language model configuration for conversation generation.
          properties:
            model_id:
              type: string
              description: >-
                The language model to use.
            temperature:
              type: number
              description: >-
                Controls randomness in the model's responses.
              minimum: 0
              maximum: 2
    CreateAgentRequest:
      type: object
      required:
        - conversation_config
      properties:
        name:
          type: string
          description: >-
            Display name for the agent.
        conversation_config:
          $ref: '#/components/schemas/ConversationConfig'
        metadata:
          type: object
          description: >-
            Additional metadata for the agent.
          additionalProperties:
            type: string
    UpdateAgentRequest:
      type: object
      properties:
        name:
          type: string
          description: >-
            Updated display name for the agent.
        conversation_config:
          $ref: '#/components/schemas/ConversationConfig'
        metadata:
          type: object
          description: >-
            Updated metadata for the agent.
          additionalProperties:
            type: string
    AgentResponse:
      type: object
      properties:
        agent_id:
          type: string
          description: >-
            The identifier of the agent.
    SimulateConversationRequest:
      type: object
      properties:
        simulated_user_config:
          type: object
          description: >-
            Configuration for the simulated user in the test conversation.
          properties:
            prompt:
              type: string
              description: >-
                Instructions defining the simulated user's behavior.
            first_message:
              type: string
              description: >-
                The initial message from the simulated user.
        max_turns:
          type: integer
          description: >-
            Maximum number of conversation turns for the simulation.
          minimum: 1
    SimulationResult:
      type: object
      properties:
        conversation_id:
          type: string
          description: >-
            Identifier for the simulated conversation.
        transcript:
          type: array
          description: >-
            Full transcript of the simulated conversation.
          items:
            type: object
            properties:
              role:
                type: string
                description: >-
                  The speaker role in the conversation.
                enum:
                  - agent
                  - user
              message:
                type: string
                description: >-
                  The spoken message content.
    ConversationListResponse:
      type: object
      properties:
        conversations:
          type: array
          description: >-
            List of conversations.
          items:
            $ref: '#/components/schemas/ConversationSummary'
        has_more:
          type: boolean
          description: >-
            Whether there are more conversations available.
        next_cursor:
          type: string
          description: >-
            Cursor for pagination.
    ConversationSummary:
      type: object
      properties:
        conversation_id:
          type: string
          description: >-
            Unique identifier for the conversation.
        agent_id:
          type: string
          description: >-
            The agent involved in the conversation.
        status:
          type: string
          description: >-
            Current status of the conversation.
          enum:
            - active
            - completed
            - failed
        started_at:
          type: string
          format: date-time
          description: >-
            Timestamp when the conversation started.
        duration_seconds:
          type: number
          description: >-
            Duration of the conversation in seconds.
    Conversation:
      type: object
      properties:
        conversation_id:
          type: string
          description: >-
            Unique identifier for the conversation.
        agent_id:
          type: string
          description: >-
            The agent involved in the conversation.
        status:
          type: string
          description: >-
            Current status of the conversation.
        transcript:
          type: array
          description: >-
            Full conversation transcript.
          items:
            type: object
            properties:
              role:
                type: string
                enum:
                  - agent
                  - user
              message:
                type: string
              timestamp:
                type: number
                description: >-
                  Timestamp in seconds from the start of the conversation.
        analysis:
          type: object
          description: >-
            Post-conversation analysis and metrics.
          properties:
            summary:
              type: string
              description: >-
                AI-generated summary of the conversation.
            sentiment:
              type: string
              description: >-
                Overall sentiment of the conversation.
            successful:
              type: boolean
              description: >-
                Whether the conversation achieved its intended goal.
        metadata:
          type: object
          description: >-
            Additional metadata about the conversation.
          additionalProperties:
            type: string
    KnowledgeBaseListResponse:
      type: object
      properties:
        documents:
          type: array
          description: >-
            List of knowledge base documents.
          items:
            $ref: '#/components/schemas/KnowledgeBaseDocument'
    KnowledgeBaseDocument:
      type: object
      properties:
        document_id:
          type: string
          description: >-
            Unique identifier for the document.
        name:
          type: string
          description: >-
            Display name of the document.
        type:
          type: string
          description: >-
            The type of the knowledge base document.
          enum:
            - file
            - url
            - text
        created_at:
          type: string
          format: date-time
          description: >-
            Timestamp when the document was added.
    AddKnowledgeBaseRequest:
      type: object
      properties:
        file:
          type: string
          format: binary
          description: >-
            A document file to upload. Supports PDF, TXT, and DOCX.
        url:
          type: string
          format: uri
          description: >-
            A URL to a web page to add as a knowledge source.
        name:
          type: string
          description: >-
            Display name for the knowledge base document.
    ToolListResponse:
      type: object
      properties:
        tools:
          type: array
          description: >-
            List of configured tools.
          items:
            $ref: '#/components/schemas/Tool'
    Tool:
      type: object
      properties:
        tool_id:
          type: string
          description: >-
            Unique identifier for the tool.
        name:
          type: string
          description: >-
            Display name of the tool.
        type:
          type: string
          description: >-
            The type of tool integration.
          enum:
            - webhook
            - mcp
            - client
        description:
          type: string
          description: >-
            Description of what the tool does.
        webhook_url:
          type: string
          format: uri
          description: >-
            The webhook URL for webhook-type tools.
        parameters:
          type: object
          description: >-
            JSON Schema defining the parameters the tool accepts.
        created_at:
          type: string
          format: date-time
          description: >-
            Timestamp when the tool was created.
    CreateToolRequest:
      type: object
      required:
        - name
        - type
      properties:
        name:
          type: string
          description: >-
            Display name for the tool.
        type:
          type: string
          description: >-
            The type of tool to create.
          enum:
            - webhook
            - mcp
            - client
        description:
          type: string
          description: >-
            Description of what the tool does.
        webhook_url:
          type: string
          format: uri
          description: >-
            The webhook endpoint URL for webhook-type tools.
        parameters:
          type: object
          description: >-
            JSON Schema defining the parameters the tool accepts.