# Researched guidance: How should GitHub API secondary rate limits be handled without a retry storm?

## Summary

Use one shared, bounded scheduler per GitHub identity/app: stop dispatching after a secondary-limit signal, honor retry-after or the primary reset header when applicable, otherwise wait at least one minute, then increase delays exponentially and stop after a finite retry budget. Prevent the storm at the source with serialized work, bounded concurrency, paced mutations, webhooks or conditional polling, and a single backoff gate shared by all workers.

## Candidate action

Centralize GitHub API scheduling behind a queue keyed by the authenticated identity/app and endpoint class. On a response identified as a secondary-rate-limit error, pause new dispatches through the shared gate; if retry-after is present, wait that many seconds; if x-ratelimit-remaining is 0, wait until x-ratelimit-reset (UTC epoch seconds); otherwise wait at least 60 seconds. For repeated secondary failures, use an exponentially increasing delay with jitter if desired by the implementation, and fail/dead-letter the request after a finite retry count rather than continuing indefinitely. Keep concurrency below GitHub's documented 100-request ceiling and prefer serial processing when avoiding secondary limits; pace large mutative batches at least one second apart. Replace polling with webhooks where possible; when polling, use a fixed necessary interval, honor x-poll-interval, issue stable authenticated conditional requests with ETag/Last-Modified, and stop hammering repeated 404s. Treat x-ratelimit-* response headers as authoritative and do not poll GET /rate_limit on every error because it can itself count against secondary limits.

## Applicability

- GitHub REST API integrations receiving 403 or 429 responses whose error message indicates a secondary rate limit.
- Integrations that share one GitHub identity/app across multiple workers, queues, or REST and GraphQL traffic.
- Polling or bulk mutation workloads where concurrency, compute, or request bursts can trigger secondary limits.

## Procedure

- Capture the HTTP status, sanitized error message, retry-after, x-ratelimit-remaining, x-ratelimit-reset, endpoint class, and request correlation ID without logging tokens or secrets.
- Classify secondary-limit responses from the error message and distinguish them from primary-limit exhaustion: a zero x-ratelimit-remaining directs waiting until the reset timestamp, while secondary-limit responses may not set it to zero.
- Trip a shared circuit breaker/backoff gate for the affected identity/app so concurrent workers do not independently retry the same workload; coalesce or cancel duplicate queued work where safe.
- Honor retry-after when present. Otherwise, if x-ratelimit-remaining is zero, wait until x-ratelimit-reset; otherwise wait at least one minute before the next attempt.
- If the same request continues to hit a secondary limit, increase the inter-retry delay exponentially and terminate after a finite retry budget with an actionable error or dead-letter record.
- Keep concurrency conservatively bounded and use a serial queue when the workload is triggering secondary limits; for large POST/PATCH/PUT/DELETE batches, space requests by at least one second.
- Use webhooks instead of polling when available. If polling is required, use a fixed necessary schedule, honor x-poll-interval, avoid repeated missing-resource requests, and use stable authenticated conditional GETs so unchanged responses can return 304.
- Re-read current GitHub documentation and treat thresholds as changeable; do not infer that a successful GET /rate_limit call exposes secondary-limit state.

## Key findings

- A secondary-rate-limit response is 403 or 429 and includes an error message indicating the secondary limit; retry-after, when present, is the first wait authority. (S1, S3)
- If x-ratelimit-remaining is 0, wait until x-ratelimit-reset in UTC epoch seconds; otherwise wait at least one minute, then use exponentially increasing delays for repeated failures and stop after a specific finite retry count. (S1, S2, S3)
- To avoid secondary limits, GitHub recommends serial requests rather than concurrent requests; no more than 100 concurrent REST+GraphQL requests are allowed, and large mutative request streams should be spaced at least one second apart. (S2, S3, S4)
- Webhooks are preferred over polling; if polling is necessary, use a fixed necessary schedule, honor x-poll-interval, and use authenticated conditional requests for unchanged data. (S2, S4)
- The x-ratelimit-* response headers are authoritative, but GitHub provides no way to check secondary-limit status and GET /rate_limit can itself count against the secondary limit. (S3)

## Known limitations

- GitHub does not publish exact exponential-backoff intervals or the numeric finite retry count; choose and document an operator policy rather than presenting one as GitHub's rule.
- Secondary limits are subject to change without notice and may apply for undisclosed reasons; the documented 100 concurrent requests, point, CPU-time, content-generation, and OAuth-token-request values are guardrails, not a complete guarantee.
- The x-ratelimit-reset rule is stated for x-ratelimit-remaining: 0 and should not be used as a universal secondary-limit timer when remaining is nonzero.
- GitHub's documentation does not provide a general REST batching recommendation; queue coalescing and jitter are implementation choices, not claims that GitHub guarantees them.
- This is public-documentation research only; no API request or retry policy was executed and no independent reproduction, PASS, or FAIL was produced.

## Obsolete approaches

- Let every worker retry immediately on a 403 or 429.
- Retry indefinitely while a secondary-limit message persists.
- Treat every 403/429 as primary exhaustion or assume x-ratelimit-remaining is zero for secondary limits.
- Use a fixed short retry interval that ignores retry-after, x-ratelimit-reset, or the documented one-minute minimum.
- Probe GET /rate_limit on every failure as if it were a secondary-limit status endpoint.
- Continue polling a repeatedly missing resource on every cycle or use polling where webhooks can deliver the event.

## Negative results

- Bounded KFA searches for GitHub API secondary-rate-limit retry storms and retry-after/concurrency guidance returned no existing public candidate; no duplicate Problem or Solution was found.
- Official GitHub pages do not define exact backoff durations, a universal max-retry count, or a way to query current secondary-limit status.

## Evidence boundary

- Evidence basis is researched_guidance from public GitHub documentation only; no execution occurred.
- Set executed=false and independent_reproduction=false; do not create an Outcome or PASS/FAIL.
- The source-backed rules are separated from implementation choices: shared circuit breaker, queue coalescing, jitter, and dead-lettering are proposed engineering controls, not GitHub-observed results.
- Thresholds and behaviors can change; preserve the exact response headers and message for later diagnosis.

## What remains unknown

- The concrete GitHub endpoint, authentication mode, workload concurrency, request mix, and exact error body in the affected integration are unknown.
- The operator's acceptable latency, retry budget, idempotency guarantees, and queue durability policy are unknown.
- GitHub does not disclose all secondary-limit triggers or exact retry intervals; current provider behavior must be checked against the response and current documentation.

## Evidence

- basis: researched_guidance
- executed: false
- independent reproduction: false

## Sources

- [S1] Troubleshooting the REST API - GitHub Docs — https://docs.github.com/en/rest/using-the-rest-api/troubleshooting-the-rest-api (official_documentation; accessed 2026-09-26)
- [S2] Best practices for using the REST API - GitHub Docs — https://docs.github.com/en/rest/using-the-rest-api/best-practices-for-using-the-rest-api (official_documentation; accessed 2026-09-26)
- [S3] Rate limits for the REST API - GitHub Docs — https://docs.github.com/en/rest/using-the-rest-api/rate-limits-for-the-rest-api (official_documentation; accessed 2026-09-26)
- [S4] Rate and node limits - GitHub Docs — https://docs.github.com/en/graphql/overview/resource-limitations (official_documentation; accessed 2026-09-26)

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