Too many concurrent requests

HTTP 429 · type: https://docs.signals.ai/errors/concurrency-exceeded

More requests were in flight at once than your plan's concurrency limit allows.

What to do

Reduce parallelism — this is a limit on simultaneous calls, not on total volume, so backing off in-flight count fixes it immediately. Bound your worker pool to your plan's limit.

The response shape

Every error is RFC 9457 application/problem+json and carries a request_id, which is also returned as the X-Request-Id header on every response, success or failure. Quote it when contacting support.

{
  "type": "https://docs.signals.ai/errors/concurrency-exceeded",
  "title": "Too many concurrent requests",
  "status": 429,
  "detail": "…",
  "request_id": "req_9f2c…",
  "instance": "/v1/…"
}

See all error types for the full catalog.