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A webhook is an HTTP POST that AGNT sends to a developer-supplied URL when an event happens, so that the developer's service can react without polling.

Definition

What is Webhook?

Quick answer

A webhook is an HTTP POST that AGNT sends to a developer-supplied URL when an event happens, so that the developer's service can react without polling.

Full definition

AGNT fires webhooks for booking.confirmed, booking.cancelled, and a growing list of commerce events. Each delivery carries an X-Agnt-Signature header containing an HMAC-SHA256 of the raw body using the webhook secret. Signatures are valid for five minutes after the event timestamp.

Failed deliveries are retried with exponential backoff up to a cap, and every attempt is visible in the developer dashboard for replay. Secrets can be rotated without downtime.

Code example

Verifying an AGNT webhook signature in Node

import crypto from "node:crypto";

function verify(rawBody, signature, secret) {
  const mac = crypto.createHmac("sha256", secret).update(rawBody).digest("hex");
  return crypto.timingSafeEqual(Buffer.from(mac), Buffer.from(signature));
}

FAQ

Webhook FAQ.

Common questions about Webhook in the AGNT platform.

A webhook is an HTTP POST that AGNT sends to a developer-supplied URL when an event happens, so that the developer's service can react without polling.

People also ask.

How do I get started with AGNT?Guides →What technology powers AGNT?Stack →How does AGNT compare to alternatives?Comparisons →

Related comparisons

A2A Protocol vs Webhooks

Webhooks push events in one direction from server to client; A2A carries structured AGPEnvelope messages in both directions so two agents can negotiate a booking in a single conversation.

Authority sources

Authority sources

HMAC (RFC 2104)

Source: agnt-backend/app/routers/webhook.py

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What is Webhook? A webhook is an HTTP POST that AGNT sends to a developer-supplied URL when an event happens, so that the developer's service can react without polling. https://agntdot.com/glossary/webhook

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See it in action.

Now you know what Webhook means. Try the live scan demo or read the developer docs to go deeper.

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