Local Webhook Development for Agent Inboxes (opens in new tab)

The first webhook integration I ever built failed before it received a single notification. The handler was solid — JSON parsing, logging, the lot — but the subscription itself showed up as failed seconds after I created it. The reason turned out to be boring: my endpoint was and the platform calling it lives on the internet, where my laptop does not. Every email-agent developer hits some version of this on day one, so here's the local development loop that actually works. The setup: you're b...