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2026-03-20
Concurrency limiting enforced

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Action concurrency limiting is now enforced

Kombo now enforces concurrency limits on action endpoints. Previously, concurrent requests were measured but not rejected. Now, when more than 30 action requests are in flight simultaneously for a single integration, additional requests are rejected with HTTP 429 and the error code PLATFORM.CONCURRENCY_LIMIT_EXCEEDED.Who is affected: Customers sending many parallel action requests (e.g., bulk-creating candidates or moving applications) may start receiving 429 responses they were not receiving before. Model read endpoints are not affected (e.g. GET /ats/candidates)What to do:
  • Handle the new PLATFORM.CONCURRENCY_LIMIT_EXCEEDED error code in your retry logic.
  • Use exponential backoff starting at ~1s.
  • Optionally, check the Concurrency-Remaining response header to throttle proactively.
See the full Concurrency Limiting guide for details.