elevenlabs-webhooks-events

name	elevenlabs-webhooks-events
description	Implement ElevenLabs webhook HMAC signature verification and event handling. Use when setting up webhook endpoints for transcription completion, call recording, or agent conversation events from ElevenLabs. Trigger with "elevenlabs webhook", "elevenlabs events", "elevenlabs webhook signature", "handle elevenlabs notifications", "elevenlabs post-call webhook", "elevenlabs transcription webhook".
allowed-tools	Read, Write, Edit, Bash(curl:*)
version	1.6.0
license	MIT
author	Jeremy Longshore <[e-mail]>
tags	["saas","voice","ai","elevenlabs","webhooks","events"]
compatibility	Designed for Claude Code

ElevenLabs Webhooks & Events

Overview

ElevenLabs webhooks send HTTP POST notifications when async operations complete: transcription completion, post-call data from Conversational AI agents, and call initiation failures. Every delivery is signed with an HMAC-SHA256 signature you must verify before processing. This skill builds a secure endpoint that verifies signatures, routes events by type, and acks fast to avoid auto-disable.

Prerequisites

• ElevenLabs account (webhooks configured in Settings > Webhooks)
• HTTPS endpoint accessible from the internet
• Webhook secret (generated during webhook creation in dashboard)

Instructions

The full, copy-ready code for each step lives in references/implementation.md; per-event handlers live in references/examples.md. The high-level workflow:

1. Know the event types — subscribe only to what you handle (table below).
2. Create the webhook in the dashboard (Settings > Webhooks) and copy the HMAC secret.
3. Verify the signature with HMAC-SHA256 over "<timestamp>.<raw_body>", using a timing-safe compare and a 5-minute replay window. See the full verifier.
4. Handle the request with a raw body parser, ack 200 immediately, then process asynchronously. See the Express handler.
5. Route events to per-type handlers. See handler examples.
6. Guard against duplicates with idempotency keyed on the event ID. See idempotency.
7. Test locally by tunneling with ngrok. See local testing.

Webhook event types

Event Type	Payload	When Triggered
post_call_transcription	Full conversation transcript, analysis, metadata	After Conversational AI call ends
post_call_audio	Base64-encoded call audio, minimal metadata	After call ends (if audio recording enabled)
call_initiation_failure	Failure reason, metadata	When an outbound call fails to connect