From Traffic Context to Confirmed Fix in 3 Minutes

An internal Gmail synchronization service was silently dropping messages after bursts of Gmail API rate-limit errors caused by using `Promise.all` to issue up to 100 metadata requests concurrently per page. Production traffic captured through an eBPF collector showed that 28 of 183 calls returned HTTP 429 within a 16-second interval, pointing to excessive concurrency rather than random failures. After initially attempting a fix before defining a measurable success criterion, the team created a local mock-based harness that tracked in-flight requests, confirming a peak of 100 concurrent calls before the change and 10 after replacing unbounded parallelism with a worker pool capped at 10. Their Agent Factory system then automated the investigation, reproduction, code change, and validation workflow in roughly three minutes, using recorded traffic and request-arrival timestamps to measure bursts even when replayed responses retained historical errors. A post-deployment production snapshot showed 407 Gmail calls with no 429 errors, compared with a prior 14.5% rate, supporting the conclusion that bounded concurrency resolved the sync failures.

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