AgentPhone messages API

openapi: 3.1.0
info:
  title: API Reference agent-webhooks messages API
  version: 1.0.0
servers:
- url: https://api.agentphone.ai
  description: Production
tags:
- name: messages
paths:
  /v1/messages:
    post:
      operationId: send-message-v-1-messages-post
      summary: Send Message
      description: 'Send an outbound message (SMS or iMessage) via the provider assigned to the number.


        Attach media by passing public HTTPS URLs in `media_urls`.


        ### Single attachment


        Pass a single-item array in `media_urls`. The URL must be publicly accessible.


        ### Carousel / multi-image (iMessage)


        To send a carousel of images on iMessage, pass 2-20 URLs in `media_urls`. Requirements:

        - Each URL must be a **publicly accessible HTTPS link** to an image (JPEG, PNG, GIF, etc.)

        - Minimum 2 URLs, maximum 20

        - `body` must be omitted or empty (text cannot be sent alongside a carousel)

        - Only supported on iMessage-capable lines


        > **Deprecation notice:** The `media_url` field (singular) is deprecated and will be removed in a future version. Use `media_urls` (array) instead — even for a single attachment, pass it as `media_urls: ["https://..."]`.'
      tags:
      - messages
      parameters:
      - name: Authorization
        in: header
        description: Bearer authentication
        required: true
        schema:
          type: string
      responses:
        '200':
          description: Successful Response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SendMessageResponse'
        '422':
          description: Validation Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HTTPValidationError'
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/SendMessageRequest'
  /v1/messages/{message_id}/reactions:
    post:
      operationId: send-reaction-v-1-messages-message-id-reactions-post
      summary: Send Reaction
      description: 'Send a tapback reaction to a message (iMessage only).


        Reactions are available only for iMessage messages. Attempting to react

        to an SMS message or another channel that does not support tapbacks

        returns a clear error.'
      tags:
      - messages
      parameters:
      - name: message_id
        in: path
        required: true
        schema:
          type: string
      - name: Authorization
        in: header
        description: Bearer authentication
        required: true
        schema:
          type: string
      responses:
        '200':
          description: Successful Response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SendReactionResponse'
        '422':
          description: Validation Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HTTPValidationError'
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/SendReactionRequest'
components:
  schemas:
    SendMessageResponse:
      type: object
      properties:
        id:
          type: string
        status:
          type: string
        channel:
          type: string
        from_number:
          type: string
        to_number:
          type: string
        conversation_id:
          type:
          - string
          - 'null'
        media_urls:
          type: array
          items:
            type: string
          default: []
        reply_to_message_id:
          type:
          - string
          - 'null'
        reply_parent_unresolved:
          type:
          - boolean
          - 'null'
      required:
      - id
      - status
      - channel
      - from_number
      - to_number
      title: SendMessageResponse
    ValidationErrorLocItems:
      oneOf:
      - type: string
      - type: integer
      title: ValidationErrorLocItems
    ValidationError:
      type: object
      properties:
        loc:
          type: array
          items:
            $ref: '#/components/schemas/ValidationErrorLocItems'
        msg:
          type: string
        type:
          type: string
      required:
      - loc
      - msg
      - type
      title: ValidationError
    SendMessageRequest:
      type: object
      properties:
        agent_id:
          type:
          - string
          - 'null'
        to_number:
          type:
          - string
          - 'null'
          description: 'Recipient of an existing chat: a phone (any format, normalized to E.164), US short code, email, or a group id (grp_...). Provide this OR `recipients` (to start a new group), not both.'
        recipients:
          type:
          - array
          - 'null'
          items:
            type: string
          description: Start a NEW iMessage group by listing 2 or more recipients (phones or emails). The first message is delivered to all of them, an iMessage group is created, and the response `to_number` returns the new group id (grp_...) to use for follow-up sends. iMessage numbers only.
        body:
          type: string
        media_url:
          type:
          - string
          - 'null'
        media_urls:
          type:
          - array
          - 'null'
          items:
            type: string
        number_id:
          type:
          - string
          - 'null'
        from_number:
          type:
          - string
          - 'null'
        send_style:
          $ref: '#/components/schemas/SendMessageRequestSendStyle'
          description: 'Optional iMessage expressive effect. Only valid on iMessage-capable numbers. Supported values: celebration, fireworks, lasers, love, confetti, balloons, spotlight, echo, invisible, gentle, loud, slam.'
        reply_to_message_id:
          type:
          - string
          - 'null'
          description: Optional parent message ID (AgentPhone Message.id) to send this message as an inline reply in iMessage.
      required:
      - body
      title: SendMessageRequest
    SendReactionRequest:
      type: object
      properties:
        reaction:
          type: string
          description: iMessage reaction to send. Classic tapbacks (love, like, dislike, laugh, emphasize, question) are supported on every iMessage line. Custom emoji reactions (e.g. "🔥", "😂", "👍") are supported on newer lines only; lines that don't support them return a 400 with upgrade instructions. Custom emoji also require the recipient to be on macOS 14 / iOS 17 or later.
      required:
      - reaction
      title: SendReactionRequest
    HTTPValidationError:
      type: object
      properties:
        detail:
          type: array
          items:
            $ref: '#/components/schemas/ValidationError'
      title: HTTPValidationError
    SendReactionResponse:
      type: object
      properties:
        id:
          type: string
        reaction_type:
          type: string
        message_id:
          type: string
        channel:
          type: string
      required:
      - id
      - reaction_type
      - message_id
      - channel
      title: SendReactionResponse
    SendMessageRequestSendStyle:
      type: string
      enum:
      - celebration
      - fireworks
      - lasers
      - love
      - confetti
      - balloons
      - spotlight
      - echo
      - invisible
      - gentle
      - loud
      - slam
      description: 'Optional iMessage expressive effect. Only valid on iMessage-capable numbers. Supported values: celebration, fireworks, lasers, love, confetti, balloons, spotlight, echo, invisible, gentle, loud, slam.'
      title: SendMessageRequestSendStyle
  securitySchemes:
    HTTPBearer:
      type: http
      scheme: bearer