Targon Chat Completions Streaming (HTTP + SSE)

asyncapi: '2.6.0'
id: 'urn:com:targon:v1:chat-completions:sse'
info:
  title: Targon Chat Completions Streaming (HTTP + SSE)
  version: '1.0.0'
  description: |
    AsyncAPI 2.6 description of Targon's **chat completion streaming** surface.

    Targon is a decentralized AI inference platform operated as Bittensor
    Subnet 4 by Manifold Labs. It does not publish a WebSocket API. The only
    asynchronous / event-style transport documented for its OpenAI-compatible
    API at https://api.targon.com/v1 is **HTTP Server-Sent Events (SSE)**
    delivered over the same REST endpoint (`POST /chat/completions`) when the
    request body sets `stream: true`. SSE is a one-way, server-to-client HTTP
    streaming channel; it is **not** WebSocket.

    Following the OpenAI-compatible convention Targon implements, tokens are
    sent as data-only server-sent events as they become available, with the
    stream terminated by a `data: [DONE]` message.

    This AsyncAPI document models only the streamed events emitted by Targon's
    SSE response. The request body itself (model, messages, etc.) is modeled in
    the companion OpenAPI document at `openapi/targon-openapi.yml`.
  contact:
    name: API Evangelist
    email: kin@apievangelist.com
    url: https://apievangelist.com
  license:
    name: API documentation - Targon
    url: https://targon.com
  x-transport-notes:
    transport: HTTP Server-Sent Events (SSE)
    protocol: https
    direction: server-to-client (one-way)
    mediaType: text/event-stream
    triggeredBy: 'POST https://api.targon.com/v1/chat/completions with request body { "stream": true }'
    terminator: 'data: [DONE]'
    notWebSocket: true
    source: https://docs.targon.com
defaultContentType: text/event-stream
servers:
  targon:
    url: api.targon.com/v1
    protocol: https
    description: |
      Targon's OpenAI-compatible REST base. Chat completion streaming is
      delivered as HTTP Server-Sent Events over this base when `stream: true`
      is set on the JSON request body. AsyncAPI 2.6 does not define a dedicated
      SSE protocol identifier; `https` is used here and the SSE transport is
      documented in `info.x-transport-notes` and on each channel.
    security:
      - bearerAuth: []
channels:
  /chat/completions:
    description: |
      Chat completion SSE stream. The client opens this channel by issuing
      `POST https://api.targon.com/v1/chat/completions` with `stream: true` in
      the JSON request body and an `Authorization: Bearer` API key. The server
      responds with `Content-Type: text/event-stream` and emits chat completion
      chunk events until a final `data: [DONE]` sentinel.
    bindings:
      http:
        type: request
        method: POST
        bindingVersion: '0.1.0'
    subscribe:
      operationId: receiveChatCompletionChunk
      summary: Receive streamed chat completion chunks as SSE events.
      message:
        $ref: '#/components/messages/ChatCompletionChunk'
components:
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: Targon API key passed as a Bearer token in the Authorization header.
  messages:
    ChatCompletionChunk:
      name: ChatCompletionChunk
      title: Chat Completion Chunk
      summary: A single data-only Server-Sent Event carrying an incremental chat completion delta.
      contentType: text/event-stream
      payload:
        type: object
        properties:
          id:
            type: string
          object:
            type: string
            example: chat.completion.chunk
          created:
            type: integer
          model:
            type: string
          choices:
            type: array
            items:
              type: object
              properties:
                index:
                  type: integer
                delta:
                  type: object
                  properties:
                    role:
                      type: string
                    content:
                      type: string
                finish_reason:
                  type: string
                  nullable: true