Send Message

Requires the `messages:write` permission.

Abhinav Raut · Last updated Sep 28, 2026

POST /api/v1/conversations/{cuuid}/messages

Requires the messages:write permission.

Authentication

Use an agent API key and secret.

Parameters

Name	Location	Type	Required	Description
cuuid	path	string	Yes

Request body

Message details

Required: Yes.

application/json

Field	Type	Required	Description
message	string	No	Message content
attachments	array of integer	No	Attachment IDs
attachments[]	integer
private	boolean	No	Whether message is private (internal note)
to	array of string	No	Email recipients
to[]	string
cc	array of string	No	CC recipients
cc[]	string
bcc	array of string	No	BCC recipients
bcc[]	string
sender_type	string (enum)	Yes	Specifies whether the message is sent by an agent or a contact. enum: ["agent", "contact"]
mentions	array of object	No	Agents or teams mentioned in a private note.
mentions[].type	string (enum)	No	Whether the mention targets an agent or a team enum: ["agent", "team"]
mentions[].id	integer	No	ID of the mentioned agent or team
echo_id	string	No	Client-generated identifier echoed back to deduplicate the message on the sender's side

Responses

200

Message sent successfully

Content type: application/json.

Field	Type	Required	Description
status	string	No	example: "success"
data	object	No
data.id	integer	No
data.created_at	string (date-time)	No
data.updated_at	string (date-time)	No
data.uuid	string	No
data.type	string (enum)	No	enum: ["incoming", "outgoing", "activity"]
data.status	string (enum)	No	enum: ["pending", "sent", "received", "failed"]
data.conversation_id	integer	No
data.conversation_uuid	string	No
data.content	string	No
data.text_content	string	No
data.content_type	string (enum)	No	enum: ["html", "text"]
data.private	boolean	No
data.sender_id	integer	No
data.sender_type	string (enum)	No	enum: ["agent", "contact"]
data.meta	object	No	nullable: true
data.meta.to	array of string	No
data.meta.to[]	string
data.meta.cc	array of string	No
data.meta.cc[]	string
data.meta.bcc	array of string	No
data.meta.bcc[]	string
data.meta.from	array of string	No
data.meta.from[]	string
data.meta.subject	string	No
data.attachments	array of object	No
data.attachments[].name	string	No
data.attachments[].size	integer	No
data.attachments[].content	string (byte)	No	nullable: true
data.attachments[].content_id	string	No
data.attachments[].content_type	string	No
data.attachments[].disposition	string (enum)	No	enum: ["inline", "attachment"]
data.attachments[].uuid	string	No
data.attachments[].url	string	No
data.attachments[].thumbnail_url	string	No
data.author	object	No
data.author.id	integer	No
data.author.first_name	string	No
data.author.last_name	string	No
data.author.email	string (email)	No	nullable: true
data.author.avatar_url	string	No	nullable: true
data.author.availability_status	string	No
data.author.type	string (enum)	No	enum: ["agent", "contact", "visitor", "ai_assistant"]
data.author.last_active_at	string (date-time)	No	nullable: true

400

Invalid request

Content type: application/json.

Field	Type	Required	Description
status	string	No	example: "error"
message	string	No	Error message example: "Invalid request"
data	unspecified	No	Additional error data nullable: true
error_type	string (enum)	No	enum: ["GeneralException", "PermissionException", "InputException", "DataException", "NetworkException", "NotFoundException", "ConflictException", "UnauthorizedException", "RateLimitException"]

401

Unauthorized

Content type: application/json.

Field	Type	Required	Description
status	string	No	example: "error"
message	string	No	Error message example: "Invalid request"
data	unspecified	No	Additional error data nullable: true
error_type	string (enum)	No	enum: ["GeneralException", "PermissionException", "InputException", "DataException", "NetworkException", "NotFoundException", "ConflictException", "UnauthorizedException", "RateLimitException"]

403

Forbidden

Content type: application/json.

Field	Type	Required	Description
status	string	No	example: "error"
message	string	No	Error message example: "Invalid request"
data	unspecified	No	Additional error data nullable: true
error_type	string (enum)	No	enum: ["GeneralException", "PermissionException", "InputException", "DataException", "NetworkException", "NotFoundException", "ConflictException", "UnauthorizedException", "RateLimitException"]

404

Not found

Content type: application/json.

Field	Type	Required	Description
status	string	No	example: "error"
message	string	No	Error message example: "Invalid request"
data	unspecified	No	Additional error data nullable: true
error_type	string (enum)	No	enum: ["GeneralException", "PermissionException", "InputException", "DataException", "NetworkException", "NotFoundException", "ConflictException", "UnauthorizedException", "RateLimitException"]

500

Internal server error

Content type: application/json.

Field	Type	Required	Description
status	string	No	example: "error"
message	string	No	Error message example: "Invalid request"
data	unspecified	No	Additional error data nullable: true
error_type	string (enum)	No	enum: ["GeneralException", "PermissionException", "InputException", "DataException", "NetworkException", "NotFoundException", "ConflictException", "UnauthorizedException", "RateLimitException"]

Specification

Download the complete OpenAPI specification.

OpenAPI definition for this endpoint

openapi: 3.0.0
info:
  title: Libredesk API
  description: >-
    REST API documentation for Libredesk helpdesk system.


    ## Authentication


    The Libredesk API supports two authentication methods:


    ### 1. Basic Authentication

    Use your API key and secret with Basic authentication:

    ```

    Authorization: Basic <base64_encoded_api_key:api_secret>

    ```


    ### 2. Token Authentication  

    Use your API key and secret with token authentication:

    ```

    Authorization: token api_key:api_secret

    ```


    To obtain API credentials, generate them from your agent profile in the
    Libredesk dashboard.
  version: 1.0.0
servers:
  - url: http://localhost:8080
    description: Local development server
security:
  - basicAuth: []
  - tokenAuth: []
paths:
  /api/v1/conversations/{cuuid}/messages:
    post:
      tags:
        - Conversations
      summary: Send Message
      description: Requires the `messages:write` permission.
      operationId: handleSendMessage
      parameters:
        - name: cuuid
          in: path
          required: true
          schema:
            type: string
      requestBody:
        description: Message details
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/MessageRequest'
      responses:
        '200':
          description: Message sent successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MessageResponse'
        '400':
          description: Invalid request
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '401':
          description: Unauthorized
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '403':
          description: Forbidden
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '404':
          description: Not found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '500':
          description: Internal server error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
      security:
        - basicAuth: []
        - tokenAuth: []
components:
  schemas:
    MessageRequest:
      type: object
      required:
        - sender_type
      properties:
        message:
          type: string
          description: Message content
        attachments:
          type: array
          items:
            type: integer
          description: Attachment IDs
        private:
          type: boolean
          description: Whether message is private (internal note)
        to:
          type: array
          items:
            type: string
          description: Email recipients
        cc:
          type: array
          items:
            type: string
          description: CC recipients
        bcc:
          type: array
          items:
            type: string
          description: BCC recipients
        sender_type:
          type: string
          enum:
            - agent
            - contact
          description: Specifies whether the message is sent by an agent or a contact.
        mentions:
          type: array
          description: Agents or teams mentioned in a private note.
          items:
            type: object
            properties:
              type:
                type: string
                enum:
                  - agent
                  - team
                description: Whether the mention targets an agent or a team
              id:
                type: integer
                description: ID of the mentioned agent or team
        echo_id:
          type: string
          description: >-
            Client-generated identifier echoed back to deduplicate the message
            on the sender's side
    MessageResponse:
      type: object
      properties:
        status:
          type: string
          example: success
        data:
          $ref: '#/components/schemas/Message'
    ErrorResponse:
      type: object
      description: Error response format
      properties:
        status:
          type: string
          example: error
        message:
          type: string
          description: Error message
          example: Invalid request
        data:
          nullable: true
          description: Additional error data
        error_type:
          type: string
          enum:
            - GeneralException
            - PermissionException
            - InputException
            - DataException
            - NetworkException
            - NotFoundException
            - ConflictException
            - UnauthorizedException
            - RateLimitException
    Message:
      type: object
      properties:
        id:
          type: integer
        created_at:
          type: string
          format: date-time
        updated_at:
          type: string
          format: date-time
        uuid:
          type: string
        type:
          type: string
          enum:
            - incoming
            - outgoing
            - activity
        status:
          type: string
          enum:
            - pending
            - sent
            - received
            - failed
        conversation_id:
          type: integer
        conversation_uuid:
          type: string
        content:
          type: string
        text_content:
          type: string
        content_type:
          type: string
          enum:
            - html
            - text
        private:
          type: boolean
        sender_id:
          type: integer
        sender_type:
          type: string
          enum:
            - agent
            - contact
        meta:
          type: object
          properties:
            to:
              type: array
              items:
                type: string
            cc:
              type: array
              items:
                type: string
            bcc:
              type: array
              items:
                type: string
            from:
              type: array
              items:
                type: string
            subject:
              type: string
          nullable: true
        attachments:
          type: array
          items:
            $ref: '#/components/schemas/Attachment'
        author:
          $ref: '#/components/schemas/MessageAuthor'
    Attachment:
      type: object
      properties:
        name:
          type: string
        size:
          type: integer
        content:
          type: string
          format: byte
          nullable: true
        content_id:
          type: string
        content_type:
          type: string
        disposition:
          type: string
          enum:
            - inline
            - attachment
        uuid:
          type: string
        url:
          type: string
        thumbnail_url:
          type: string
    MessageAuthor:
      type: object
      properties:
        id:
          type: integer
        first_name:
          type: string
        last_name:
          type: string
        email:
          type: string
          format: email
          nullable: true
        avatar_url:
          type: string
          nullable: true
        availability_status:
          type: string
        type:
          type: string
          enum:
            - agent
            - contact
            - visitor
            - ai_assistant
        last_active_at:
          type: string
          format: date-time
          nullable: true
  securitySchemes:
    basicAuth:
      type: http
      scheme: basic
      description: >-
        Basic authentication using base64 encoded API key and secret. Format:
        `Authorization: Basic <base64(api_key:api_secret)>`
    tokenAuth:
      type: apiKey
      name: Authorization
      in: header
      description: >-
        Token authentication using API key and secret. Format: `Authorization:
        token api_key:api_secret`

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