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

# Reply to a ticket

> A `public` message reaches the requester through whichever channel the ticket arrived on. An `internal` note notifies nobody outside the workspace and is never returned by the read endpoints.



## OpenAPI

````yaml /api-reference/openapi.json post /tickets/{id}/messages
openapi: 3.1.0
info:
  title: miniDesk API
  version: 1.0.0
  description: >-
    Create and work support tickets from your own systems. Every response
    carries an `X-Request-Id`; quote it when reporting a problem.
servers:
  - url: https://api.minidesk.ai/v1
security:
  - bearerAuth: []
paths:
  /tickets/{id}/messages:
    post:
      tags:
        - Messages
      summary: Reply to a ticket
      description: >-
        A `public` message reaches the requester through whichever channel the
        ticket arrived on. An `internal` note notifies nobody outside the
        workspace and is never returned by the read endpoints.
      operationId: sendMessage
      parameters:
        - name: id
          in: path
          required: true
          description: The ticket's id.
          schema:
            type: string
            format: uuid
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                body:
                  type: string
                  minLength: 1
                  maxLength: 50000
                visibility:
                  default: public
                  type: string
                  enum:
                    - public
                    - internal
                client_id:
                  type: string
                  maxLength: 64
              required:
                - body
      responses:
        '201':
          description: The message was recorded.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CreatedMessage'
        '400':
          description: The body failed validation. `field` names the offending property.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '401':
          description: Missing, malformed, or revoked credential.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '402':
          description: >-
            Out of conversations for this period. Reads and internal notes still
            work.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '404':
          description: Unknown id, or a resource belonging to another workspace.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '429':
          description: Over the rate limit. See the `Retry-After` header.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
components:
  schemas:
    CreatedMessage:
      type: object
      properties:
        id:
          type: string
          format: uuid
          pattern: >-
            ^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|ffffffff-ffff-ffff-ffff-ffffffffffff)$
        visibility:
          type: string
          enum:
            - public
            - internal
        created_at:
          type: string
      required:
        - id
        - visibility
        - created_at
    Error:
      type: object
      properties:
        error:
          type: object
          properties:
            code:
              type: string
              enum:
                - validation_failed
                - invalid_credential
                - identity_required
                - identity_invalid
                - quota_exhausted
                - forbidden
                - not_found
                - conflict
                - invalid_transition
                - rate_limited
                - internal_error
                - service_unavailable
            message:
              type: string
            field:
              type: string
          required:
            - code
            - message
      required:
        - error
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: >-
        An API credential from **Settings → API**, sent as `Authorization:
        Bearer mdsk_api_...`. Issued per workspace and shown once.

````