hermes - 💡(How to fix) Fix Webhook: coalesce same-object GitHub events to avoid duplicate agent runs and 429s [1 comments, 1 participants]

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NousResearch/hermes-agent#13456Fetched 2026-04-22 08:06:24
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Background

GitHub label state transitions emit multiple labeled / unlabeled webhook events in rapid succession for the same logical object (for example one Issue moving from assigned:bajie + status:working to assigned:wukong + status:review).

Hermes currently processes each webhook POST independently and immediately spawns a new agent run per delivery ID. This causes:

  • duplicate agent/model invocations for the same logical transition
  • transient-state misreads during label convergence
  • avoidable 429 pressure when several events arrive within the same second

Goal

Add webhook-side coalescing/debounce for same-object GitHub events so a burst of near-simultaneous events results in one agent run, preferably using the last effective event in the short window.

Proposed behavior

  • Group by logical object, not just delivery ID
  • Start with GitHub issues / pull_request routes
  • Within a short configurable debounce window, keep the last event and drop earlier same-object duplicates from execution
  • Preserve idempotency for exact delivery retries
  • Emit clear logs showing coalesced event count and final chosen event
  • Make this route-configurable, not a global blunt rule for all webhooks

Notes

This is infra/runtime behavior in Hermes itself, not a project business-code issue.

extent analysis

TL;DR

Implement a debounce mechanism in Hermes to coalesce same-object GitHub events within a short configurable window, ensuring only the last event triggers an agent run.

Guidance

  • Identify the logical object (e.g., issue or pull request) and group incoming webhook events accordingly to enable coalescing.
  • Introduce a configurable debounce window (e.g., 1-2 seconds) to determine the time frame within which duplicate events are dropped.
  • Develop a mechanism to preserve idempotency for exact delivery retries, ensuring that retries of the same event do not cause duplicate agent invocations.
  • Implement logging to track the number of coalesced events and the final chosen event for debugging and monitoring purposes.

Example

No code example is provided due to the high-level nature of the issue and the need for a specific implementation details.

Notes

The solution should focus on modifying the Hermes infrastructure to handle webhook events more efficiently, without affecting project business code. The debounce window duration and coalescing logic may require tuning based on the specific requirements and event patterns of the application.

Recommendation

Apply a workaround by implementing the proposed debounce mechanism in Hermes, as it directly addresses the issue of duplicate agent invocations and transient-state misreads caused by rapid successive webhook events.

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hermes - 💡(How to fix) Fix Webhook: coalesce same-object GitHub events to avoid duplicate agent runs and 429s [1 comments, 1 participants]