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Why Webhooks Fail for Long-Running AI Agents and How to Fix It

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Webhooks are designed for short-lived, stateless HTTP requests, making them poorly suited for autonomous AI agents that may take minutes to process tasks. Common failures include duplicate event delivery from retries, missed events when the agent is busy, and silent breakdowns caused by NAT or changing IP addresses. The 'acknowledge immediately, process asynchronously' workaround introduces state-leakage and duplicate-delivery bugs rather than solving the root problem. A more reliable alternative is a persistent outbound tunnel that keeps a stable connection regardless of network changes, eliminating the need for a public-facing webhook URL. Pilot Protocol is one implementation of this model, using encrypted UDP tunnels with NAT traversal to let agents receive messages only when they are ready to process them.

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