Local Webhook Development for Agent Inboxes

Short summary

Practical guide to local webhook development for Nylas Agent Inboxes using HTTPS tunnels and trial domains, solving the classic localhost problem. Covers the 10-second verification handshake, payload inspection, HMAC-SHA256 signature validation, and critical production edge cases like at-least-once delivery and message truncation. Includes Express.js code examples and debugging workflow to catch issues before production.

• •Use Nylas trial domain (*.nylas.email) + HTTPS tunnel (ngrok) for local development
• •Webhook verification is a 10-second GET handshake that must echo the challenge parameter
• •Catch delivery quirks locally (duplicate messages, out-of-order events, >1MB truncation) before production

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