# Post Public Chat Message

> POST /api/v1/public/embed/chat/{session_token}/messages — request parameters and responses from the Menace Voice API schema.

`POST /api/v1/public/embed/chat/{session_token}/messages`

{/* Generated by scripts/sync_docs_api.mjs. Edit the API schema source to change the contract. */}

See [authentication](/api-reference/authentication) for workspace API access. Public embed and artifact endpoints use their documented session or access tokens.

## API contract for documentation tools

Generated from the OpenAPI schema. Do not infer a different parameter type from an example. Authentication headers are alternatives as explained in the authentication guide.

### Parameters

| Name | Location | Type | Required | Description and constraints |
| --- | --- | --- | --- | --- |
| session_token | path | string | yes |  |

### Request body: application/json

Required body. Schema: PublicEmbedChatMessageRequest (object).

| Field | Type | Required | Description and constraints |
| --- | --- | --- | --- |
| text | string | yes | minLength: 1; maxLength: 4000 |
| expected_revision | integer or null | no |  |

### Response 200

Successful Response

application/json: PublicEmbedChatSessionResponse (object).

| Field | Type | Required | Description and constraints |
| --- | --- | --- | --- |
| revision | integer | yes |  |
| state | string | yes |  |
| is_completed | boolean | yes |  |
| turns | array of PublicEmbedChatTurn (object) | yes |  |

### Response 404

Not found

### Response 422

Validation Error

application/json: HTTPValidationError (object).

| Field | Type | Required | Description and constraints |
| --- | --- | --- | --- |
| detail | array of ValidationError (object) | no |  |

## OpenAPI

````yaml api-reference/openapi.json post /api/v1/public/embed/chat/{session_token}/messages
openapi: 3.1.0
info:
  title: Menace Voice API
  description: API for Menace Voice agents
  version: 1.0.0
servers:
  - url: https://voice.menaceui.com
    description: Production
  - url: http://localhost:8000
    description: Local development
paths:
  /api/v1/public/embed/chat/{session_token}/messages:
    post:
      tags:
        - main
      summary: Post Public Chat Message
      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:
    HTTPValidationError:
      properties:
        detail:
          items:
            $ref: "#/components/schemas/ValidationError"
          type: array
          title: Detail
      type: object
      title: HTTPValidationError
    PublicEmbedChatMessage:
      properties:
        text:
          type: string
          title: Text
        created_at:
          anyOf:
            - type: string
            - type: "null"
          title: Created At
      type: object
      required:
        - text
      title: PublicEmbedChatMessage
    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
    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"
      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
````