AI agents with Langfuse webhooks

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

Get started now

What you can do with Langfuse webhooks

Start an agent

Langfuse events can start a new agent run. For example, an agent that tests every new Langfuse prompt version.

Resume an agent

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

Message an agent

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

Events you can receive from Langfuse

Langfuse sends events like prompt-version, monitor-alert and project-notification, and your agent can filter on any of them.

View all events

Example

An agent that tests every new Langfuse prompt version

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


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


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

Handled for you

Docs

Verified for you

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

Retries don't run twice

Retries are matched on event.id, so a retried webhook doesn't start a second run.

Filter before anything runs

Only the Langfuse 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 Langfuse

    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 Langfuse'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 Langfuse's signing secret

    Copy the signing secret from Langfuse. 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 Langfuse.

  4. 4

    Try it

    Send a test event from Langfuse, 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 Langfuse webhooks?

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

Get started for free