Upstream emits AI SDK v5 {"type":"error"} events inside an HTTP 200 stream.
The translator turned them into fake success content ([CommandCode error: ...]
+ finish_reason stop), so account/model fallback never fired and logs showed
Status: success.
- translator: error events now emit an OpenAI-shaped error chunk (chunk.error)
instead of content; parseSSEToOpenAIResponse already detects chunk?.error
- executor: peek the first events before committing the response; an early
error event returns 502 so fallback runs before any byte reaches the client
CommandCode upstream only speaks NDJSON streaming; the executor always
wraps it as OpenAI SSE. Force body.stream=true so non-stream client
requests still produce a parseable upstream stream (router aggregates
SSE→JSON downstream).
Co-authored-by: Cursor <cursoragent@cursor.com>
