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

# Send Conversation Message

> Send a new message within an existing conversation.



## OpenAPI

````yaml POST /v1/conversations/{id}/messages
openapi: 3.0.0
info:
  title: Conduit API
  version: 1.0.0
  description: Public API for Conduit.
servers:
  - url: https://api.conduit.ai
    description: Production
security: []
tags:
  - name: meta
    description: Discovery and API metadata endpoints.
  - name: agents
    description: >-
      V2 chat agent configuration, including instructions, skills, triggers, and
      automation behavior.
  - name: contacts
    description: >-
      Contact profile and contact-scoped related resources such as tickets and
      calls.
  - name: workspaces
    description: Workspaces accessible to the current API token.
  - name: escalations
    description: >-
      Chat escalations that require operator review, including message, proposed
      response, and disposition context when available.
  - name: conversations
    description: >-
      Canonical message threads. Use these endpoints to list threads, inspect
      conversation state, read transcripts, and send replies.
  - name: conversation-tags
    description: >-
      Conversation labels, root topics, and subtopics used for classification
      and topic analytics.
  - name: tickets
    description: >-
      Operational queue items tied to conversations, including ticket-scoped
      transcripts and replies.
  - name: calls
    description: Phone call records, transcripts, summaries, and recordings when available.
  - name: reservations
    description: >-
      PMS reservations synced from the workspace's integrations (Hostaway,
      Guesty, Airbnb, etc.), including guest identity, payment status, and stay
      dates.
  - name: appointments
    description: >-
      Scheduled appointments (bookings) backed by the Conduit booking service.
      Exposes allocation context and the upstream booking-service `external_id`.
  - name: helpdesk_tickets
    description: >-
      Helpdesk tickets mirrored from external helpdesk integrations (Zendesk,
      Pylon, Plain), including requester identity and upstream metadata.
  - name: kb
    description: >-
      Knowledge base search and node management. Nodes represent knowledge base
      entries (files or directories), chunks are the indexed retrieval units
      used by search.
  - name: skills
    description: >-
      Workspace agent skills that can be attached to V2 chat agents.
      Sidebar/global-assistant skills are intentionally excluded.
  - name: custom_tools
    description: >-
      Custom code tools: user-authored Python/JavaScript functions executed in a
      sandbox when an agent calls them. Includes a runtimes endpoint describing
      the entrypoint signature, return shape, and available dependencies per
      language.
  - name: inbox_types
    description: >-
      Workspace inbox types. Each id is stable and usable as a message trigger's
      `inboxTypeId` and as the `inbox_type_id` filter on list conversations.
paths:
  /v1/conversations/{id}/messages:
    post:
      tags:
        - conversations
      summary: Send message to conversation
      description: >-
        Sends a reply on the current conversation thread. Requires a token with
        write access and uses the active channel/thread behind the conversation.
      operationId: sendConversationMessage
      parameters:
        - schema:
            type: string
            description: Canonical conversation id.
            example: ph77c0dy0mgdpzmqz6tesry8w184002s
          required: true
          name: id
          in: path
        - schema:
            type: string
            description: >-
              Optional workspace override. If omitted, Conduit resolves the
              conversation's workspace automatically.
            example: j57demo8f8x7c9v0n2q4r6t8y1u3i5o
          required: false
          name: workspace_id
          in: query
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                body:
                  type: string
                  minLength: 1
              required:
                - body
              description: Request body for sending a message into an existing thread.
              example:
                body: Hi there, can you confirm check-in time?
                attachments:
                  - attachment_id: kg2a8d8w8zv1m9q9f9h7e3b2n97j6x2c
                    name: failed-contacts.csv
                    content_type: text/csv
                    content_length: 18432
      responses:
        '201':
          description: Conversation message sent
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    type: object
                    properties:
                      id:
                        type: string
                        nullable: true
                      workspace_id:
                        type: string
                      conversation_id:
                        type: string
                      ticket_id:
                        type: string
                        nullable: true
                      channel:
                        type: string
                        nullable: true
                      status:
                        type: string
                        enum:
                          - sent
                    required:
                      - id
                      - workspace_id
                      - conversation_id
                      - channel
                      - status
                required:
                  - data
                description: Result returned after a message is accepted for delivery.
                example:
                  data:
                    id: yh7t5azsr0zpfpyf67vtce0j6n844y1e
                    workspace_id: j57demo8f8x7c9v0n2q4r6t8y1u3i5o
                    conversation_id: ph77c0dy0mgdpzmqz6tesry8w184002s
                    ticket_id: null
                    channel: unthreaded_email
                    status: sent
        '400':
          description: Invalid request
          content:
            application/json:
              schema:
                type: object
                properties:
                  error:
                    type: string
                required:
                  - error
                description: Standard error response.
                example:
                  error: Invalid workspace id
        '401':
          description: Unauthorized
          content:
            application/json:
              schema:
                type: object
                properties:
                  error:
                    type: string
                required:
                  - error
                description: Standard error response.
                example:
                  error: Invalid workspace id
        '403':
          description: Forbidden
          content:
            application/json:
              schema:
                type: object
                properties:
                  error:
                    type: string
                required:
                  - error
                description: Standard error response.
                example:
                  error: Invalid workspace id
        '404':
          description: Not found
          content:
            application/json:
              schema:
                type: object
                properties:
                  error:
                    type: string
                required:
                  - error
                description: Standard error response.
                example:
                  error: Invalid workspace id
        '409':
          description: Conversation cannot be replied to
          content:
            application/json:
              schema:
                type: object
                properties:
                  error:
                    type: string
                required:
                  - error
                description: Standard error response.
                example:
                  error: Invalid workspace id
        '429':
          description: Rate limit exceeded
          content:
            application/json:
              schema:
                type: object
                properties:
                  error:
                    type: string
                required:
                  - error
                description: Standard error response.
                example:
                  error: Invalid workspace id
      security:
        - bearerAuth: []
components:
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      bearerFormat: API Token
      description: >-
        Conduit API token. Use `Authorization: Bearer <token>`. Read/write
        endpoints require a token with write access.

````