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

# Post Public Chat Message

> Send a message using the embed session token, origin, and supported revision fields. A stale revision returns 409; ended or unavailable sessions cannot continue.



## OpenAPI

````yaml /api-reference/openapi.json post /api/v1/public/embed/chat/{session_token}/messages
openapi: 3.1.0
info:
  title: Athena API
  version: 1.0.0
  description: >-
    Hosted Athena customer API. Authenticate backend management and call-trigger
    requests with X-API-Key. Website embeds and artifact playback use their own
    scoped tokens. Provider availability, feature settings, and verification
    limits are described in the guides.
servers:
  - url: https://athena.tryopencomputer.com
    description: Hosted Athena API
security: []
paths:
  /api/v1/public/embed/chat/{session_token}/messages:
    post:
      tags:
        - Public
      summary: Post Public Chat Message
      description: >-
        Send a message using the embed session token, origin, and supported
        revision fields. A stale revision returns 409; ended or unavailable
        sessions cannot continue.
      operationId: >-
        post_public_chat_message_api_v1_public_embed_chat__session_token__messages_post
      parameters:
        - name: session_token
          in: path
          required: true
          schema:
            type: string
            title: Session Token
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/PublicEmbedChatMessageRequest'
      responses:
        '200':
          description: Successful Response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/PublicEmbedChatSessionResponse'
        '404':
          description: Not found
        '422':
          description: Validation Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HTTPValidationError'
components:
  schemas:
    PublicEmbedChatMessageRequest:
      properties:
        text:
          type: string
          maxLength: 4000
          minLength: 1
          title: Text
        expected_revision:
          anyOf:
            - type: integer
            - type: 'null'
          title: Expected Revision
      type: object
      required:
        - text
      title: PublicEmbedChatMessageRequest
    PublicEmbedChatSessionResponse:
      properties:
        revision:
          type: integer
          title: Revision
        state:
          type: string
          title: State
        is_completed:
          type: boolean
          title: Is Completed
        turns:
          items:
            $ref: '#/components/schemas/PublicEmbedChatTurn'
          type: array
          title: Turns
      type: object
      required:
        - revision
        - state
        - is_completed
        - turns
      title: PublicEmbedChatSessionResponse
    HTTPValidationError:
      properties:
        detail:
          items:
            $ref: '#/components/schemas/ValidationError'
          type: array
          title: Detail
      type: object
      title: HTTPValidationError
    PublicEmbedChatTurn:
      properties:
        id:
          type: string
          title: Id
        status:
          type: string
          title: Status
        user_message:
          anyOf:
            - $ref: '#/components/schemas/PublicEmbedChatMessage'
            - type: 'null'
        assistant_message:
          anyOf:
            - $ref: '#/components/schemas/PublicEmbedChatMessage'
            - type: 'null'
        assistant_messages:
          anyOf:
            - items:
                $ref: '#/components/schemas/PublicEmbedChatMessage'
              type: array
            - type: 'null'
          title: Assistant Messages
      type: object
      required:
        - id
        - status
      title: PublicEmbedChatTurn
    ValidationError:
      properties:
        loc:
          items:
            anyOf:
              - type: string
              - type: integer
          type: array
          title: Location
        msg:
          type: string
          title: Message
        type:
          type: string
          title: Error Type
        input:
          title: Input
        ctx:
          type: object
          title: Context
      type: object
      required:
        - loc
        - msg
        - type
      title: ValidationError
    PublicEmbedChatMessage:
      properties:
        text:
          type: string
          title: Text
        created_at:
          anyOf:
            - type: string
            - type: 'null'
          title: Created At
      type: object
      required:
        - text
      title: PublicEmbedChatMessage

````

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