Function streamMetadata

streamMetadata(
    systemPrompt: string,
    userPrompt: string,
    model: string,
    signal?: AbortSignal,
    fallbackModels?: string[],
): Promise<Response>
Opens a streaming chat completion request to OpenRouter and returns the raw upstream Response object whose body is an SSE text/event-stream.

The caller is responsible for piping response.body to the client. The request is aborted when signal fires (i.e. client disconnect).
Parameters
- systemPrompt: string
  Instructions for the AI
- userPrompt: string
  The user-facing content
- model: string
  OpenRouter model identifier
- Optionalsignal: AbortSignal
  Optional AbortSignal (e.g. from the Next.js request)
- OptionalfallbackModels: string[]
  Optional ordered fallback model identifiers. When passed, OpenRouter receives models: [model, ...fallbackModels] so it can route to the first available model for the streaming request.
Returns Promise<Response>
Throws
RateLimitError on HTTP 429

Throws
Error on any other non-2xx or network failure
- Defined in lib/ai/openrouter.ts:288