AI agents with Retell AI webhooks

Receive Retell AI webhooks on Trigger.dev and use them to start, resume or message your AI agents.

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What you can do with Retell AI webhooks

Start an agent

Retell AI events can start a new agent run. For example, an agent that follows up after every Retell call.

Resume an agent

An agent can pause until the Retell AI event it needs arrives, for up to 90 days, and costs nothing while it waits.

Message an agent

Retell AI events can land in a running agent's conversation, so it acts on them with full context.

Events you can receive from Retell AI

Retell AI sends events like call_started, call_ended and call_analyzed, and your agent can filter on any of them.

View all events

Example

An agent that follows up after every Retell call

import { webhook, webhooks } from "@trigger.dev/sdk";


export const retell = webhooks.endpoint.define({
  id: "retell",
  source: webhooks.retell(),
});


export const retellEvents = webhook({
  id: "retell-events",
  endpoint: retell,
  filter: "event.event == 'call_ended'",
  onEvent: async ({ event }) => {
    // Start, resume or message your agent with the event
    console.log(event);
  },
});

Handled for you

Docs

Verified for you

webhooks.retell() checks the X-Retell-Signature header on every request. Bad requests are rejected before anything runs.

Filter before anything runs

Only the Retell AI events you care about start a run. Filtered webhooks use no compute.

See every delivery

Every webhook is recorded with its payload, headers and the agents it reached, so you can debug it and replay it.

Get started

  1. 1

    Set up the agent

    Copy the starter prompt into your coding agent, like Claude Code, Cursor or Codex. It creates a Trigger.dev project and adds the webhook endpoint. Prefer to write it yourself? Start from the example above.

  2. 2

    Add the webhook in Retell AI

    Deploy your project, or run trigger dev, and the endpoint appears on the Webhooks page of the Trigger.dev dashboard with its URL. Add that URL in Retell AI's webhook settings and pick the events you need. The endpoint's Copy setup prompt button gives your coding agent the exact steps.

  3. 3

    Add Retell AI's signing secret

    Copy the signing secret from Retell AI. Then on the endpoint's page in the Trigger.dev dashboard, choose Set signing secret and paste it in, so Trigger.dev can check every request really came from Retell AI.

  4. 4

    Try it

    Send a test event from Retell AI, or use the endpoint's Test tab. It appears on the endpoint's Deliveries tab, with the agents it reached.

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Ready to build with Retell AI webhooks?

Declare an endpoint, deploy, and paste the URL into your provider.

Get started for free