Subscribe to webhooks

import express from "express";
import Anthropic from "@anthropic-ai/sdk";

const client = new Anthropic(); // reads ANTHROPIC_WEBHOOK_SIGNING_KEY from env
const app = express();

// IMPORTANT: use express.raw(), not express.json(). The signature is computed over raw bytes.
app.post("/webhook", express.raw({ type: "application/json" }), (req, res) => {
  let event;
  try {
    // unwrap() throws if the signature is invalid or the payload is stale
    event = client.beta.webhooks.unwrap(req.body.toString("utf8"), {
      headers: req.headers as Record<string, string>
    });
  } catch {
    return res.status(400).send("invalid signature");
  }

  switch (event.data.type) {
    case "session.status_idled":
      console.log("session idled:", event.data.id);
      break;
    // handle other event types
  }

  res.sendStatus(200);
});

using Anthropic;

var client = new AnthropicClient(); // reads ANTHROPIC_WEBHOOK_SIGNING_KEY from env
var app = WebApplication.Create(args);

app.MapPost("/webhook", async (HttpRequest request) =>
{
    using var reader = new StreamReader(request.Body);
    var body = await reader.ReadToEndAsync();
    var headers = request.Headers.ToDictionary(header => header.Key, header => header.Value.ToString());

    UnwrapWebhookEvent webhookEvent;
    try
    {
        // Unwrap() throws if the signature is invalid or the payload is stale
        webhookEvent = client.Beta.Webhooks.Unwrap(body, headers);
    }
    catch
    {
        return Results.BadRequest("invalid signature");
    }

    if (webhookEvent.Data.TryPickSessionStatusIdled(out var idled))
    {
        Console.WriteLine({{CONTENT}}quot;session idled: {idled.ID}");
    }
    // handle other event types

    return Results.Ok();
});

package main

import (
	"fmt"
	"io"
	"net/http"

	"github.com/anthropics/anthropic-sdk-go"
)

var client = anthropic.NewClient() // reads ANTHROPIC_WEBHOOK_SIGNING_KEY from env

func webhook(w http.ResponseWriter, r *http.Request) {
	body, err := io.ReadAll(r.Body)
	if err != nil {
		http.Error(w, "could not read body", http.StatusBadRequest)
		return
	}

	// Unwrap returns an error if the signature is invalid or the payload is stale
	event, err := client.Beta.Webhooks.Unwrap(body, r.Header)
	if err != nil {
		http.Error(w, "invalid signature", http.StatusBadRequest)
		return
	}

	switch event.Data.Type {
	case "session.status_idled":
		fmt.Println("session idled:", event.Data.ID)
		// handle other event types
	}

	w.WriteHeader(http.StatusOK)
}

func main() {
	http.HandleFunc("/webhook", webhook)
}

import com.anthropic.client.AnthropicClient;
import com.anthropic.client.okhttp.AnthropicOkHttpClient;
import com.anthropic.core.UnwrapWebhookParams;
import com.anthropic.core.http.Headers;
import com.sun.net.httpserver.HttpServer;

// reads ANTHROPIC_WEBHOOK_SIGNING_KEY from env
AnthropicClient client = AnthropicOkHttpClient.fromEnv();

void main() throws Exception {
    var server = HttpServer.create(new InetSocketAddress(8000), 0);
    server.createContext("/webhook", exchange -> {
        var body = new String(exchange.getRequestBody().readAllBytes());
        var headers = Headers.builder();
        exchange.getRequestHeaders().forEach(headers::put);

        try {
            // unwrap() throws if the signature is invalid or the payload is stale
            var event = client.beta().webhooks().unwrap(
                UnwrapWebhookParams.builder()
                    .body(body)
                    .headers(headers.build())
                    .build());

            event.data().sessionStatusIdled().ifPresent(idled ->
                IO.println("session idled: " + idled.id()));
            // handle other event types

            exchange.sendResponseHeaders(200, -1);
        } catch (Exception _) {
            exchange.sendResponseHeaders(400, -1);
        }
        exchange.close();
    });
}

use Anthropic\Client;
use Anthropic\Core\Exceptions\WebhookException;

$client = new Client(); // reads ANTHROPIC_WEBHOOK_SIGNING_KEY from env

$body = file_get_contents('php://input');
$headers = getallheaders();

try {
    // unwrap() throws if the signature is invalid or the payload is stale
    $event = $client->beta->webhooks->unwrap($body, headers: $headers);
} catch (WebhookException) {
    http_response_code(400);
    exit('invalid signature');
}

match ($event->data->type) {
    'session.status_idled' => print "session idled: {$event->data->id}\n",
    // handle other event types
    default => null,
};

http_response_code(200);

require "sinatra"
require "anthropic"

client = Anthropic::Client.new # reads ANTHROPIC_WEBHOOK_SIGNING_KEY from env

post "/webhook" do
  headers = request.env
    .select { |key, _| key.start_with?("HTTP_") }
    .transform_keys { it.delete_prefix("HTTP_").downcase.tr("_", "-") }

  begin
    # unwrap raises if the signature is invalid or the payload is stale
    event = client.beta.webhooks.unwrap(request.body.read, headers: headers)
  rescue StandardError
    halt 400, "invalid signature"
  end

  if event.data.type == "session.status_idled"
    puts "session idled: #{event.data.id}"
  end
  # handle other event types

  status 200
end

if (event.data.type === "session.status_idled") {
  const session = await client.beta.sessions.retrieve(event.data.id);
  notifyUser(session);
}
res.sendStatus(204);

if (webhookEvent.Data.TryPickSessionStatusIdled(out var idled))
{
    var session = await client.Beta.Sessions.Retrieve(idled.ID);
    NotifyUser(session);
}
return Results.StatusCode(204);

if event.Data.Type == "session.status_idled" {
	session, err := client.Beta.Sessions.Get(r.Context(), event.Data.ID, anthropic.BetaSessionGetParams{})
	if err != nil {
		panic(err)
	}
	notifyUser(session)
}
w.WriteHeader(http.StatusNoContent)

event.data().sessionStatusIdled().ifPresent(idled -> {
    var session = client.beta().sessions().retrieve(idled.id());
    notifyUser(session);
});
exchange.sendResponseHeaders(204, -1);

if ($event->data->type === 'session.status_idled') {
    $session = $client->beta->sessions->retrieve($event->data->id);
    notifyUser($session);
}
http_response_code(204);

if event.data.type == "session.status_idled"
  session = client.beta.sessions.retrieve(event.data.id)
  notify_user(session)
end
status 204