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Overview

Webhooks allow you to receive real-time notifications when important events occur in your Manus tasks. When you register a webhook, Manus will send HTTP POST requests to your specified callback URL whenever these events are triggered.

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How Webhook Events Work

When you create and execute tasks, two key lifecycle events can trigger webhook deliveries:
  • Task Creation: Immediately after a task is successfully created via the API
  • Task State Change: When a task completes, or requires user input
Each webhook delivery contains a specific event type identifier and a structured payload with relevant task information. Your endpoint will receive these as standard HTTP POST requests that you can process like any other API call.

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Setting Up Webhooks

Manage Webhooks

Navigate to the API Integration settings to create or manage webhooks.
 Before activating a webhook, Manus will send a test request to verify your endpoint is accessible and responding correctly. Your endpoint should:
  • Respond with HTTP status code 200
  • Accept POST requests with JSON payloads
  • Respond within 10 seconds

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Event Types and Payloads

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task_created Event

When it triggers: Immediately after a new task is successfully created. Why it’s useful: Allows you to track task creation in your own systems, send confirmation emails, or update dashboards in real-time. Payload Schema:
FieldTypeRequiredDescription
event_idstringYesUnique identifier for this webhook event
event_typestringYesAlways "task_created" for this event
task_idstringYesUnique identifier for the created task
task_titlestringYesHuman-readable title of the task
task_urlstringYesDirect URL to view the task in Manus app
Example Payload: 
{
  "event_id": "task_created_task_abc123",
  "event_type": "task_created",
  "task_detail":{
    "task_id": "task_abc123",
    "task_title": "Generate quarterly sales report",
    "task_url": "https://manus.im/app/task_abc123",
  }
}

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task_stopped Event

When it triggers: When a task reaches a stopping point - either because it completed successfully or needs user input to proceed. Why it’s useful: Essential for knowing when your tasks finish and what the outcome was. Enables automated workflows based on task completion. Payload Schema:
FieldTypeRequiredDescription
event_idstringYesUnique identifier for this webhook event
event_typestringYesAlways "task_stopped" for this event
task_idstringYesUnique identifier for the task
task_titlestringYesHuman-readable title of the task
task_urlstringYesDirect URL to view the task in Manus app
messagestringYesStatus message from the task execution
attachmentsarrayNoList of files generated by the task
stop_reasonstringYesWhy the task stopped: "finish" or "ask"
Stop Reason Values:
  • "finish": Task completed successfully and has final results
  • "ask": Task paused and requires user input or confirmation to continue
Attachment Object Schema:
FieldTypeRequiredDescription
file_namestringYesName of the generated file
urlstringYesSecure download URL for the file
size_bytesintegerYesFile size in bytes
Example Payload (Task Completed): 
{
  "event_id": "task_stopped_task_abc123",
  "event_type": "task_stopped",
  "task_detail": {
    "task_id": "task_abc123",
    "task_title": "Generate quarterly sales report",
    "task_url": "https://manus.im/app/task_abc123",
    "message": "I've completed the quarterly sales report analysis. The report includes revenue trends, top-performing products, and regional breakdowns.",
    "attachments": [
      {
        "file_name": "q4-sales-report.pdf",
        "url": "https://s3.amazonaws.com/manus-files/reports/q4-sales-report.pdf",
        "size_bytes": 2048576
      },
      {
        "file_name": "sales-data.xlsx",
        "url": "https://s3.amazonaws.com/manus-files/reports/sales-data.xlsx",
        "size_bytes": 512000
      }
    ],
    "stop_reason": "finish"
  }
}
Example Payload (User Input Required): 
{
  "event_id": "task_stopped_task_abc123",
  "event_type": "task_stopped",
  "task_detail": {
    "task_id": "task_abc123",
    "task_title": "Book restaurant reservation",
    "task_url": "https://manus.im/app/task_abc123",
    "message": "I found several restaurants with availability for your requested date and time. Which option would you prefer? 1) Bistro Milano - 7:00 PM, 2) Garden Terrace - 7:30 PM, 3) The Blue Door - 8:00 PM",
    "attachments": [],
    "stop_reason": "ask"
  }
}

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Integration Examples

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Slack Integration

Post task updates directly to Slack channels: 
// Example webhook handler for Slack integration
app.post('/manus-webhook', (req, res) => {
  const { event_type, task_detail } = req.body;
  const { task_title, message, stop_reason } = task_detail || {};

  if (event_type === 'task_stopped' && stop_reason === 'finish') {
    // Post completion message to Slack
    slack.chat.postMessage({
      channel: '#ai-tasks',
      text: `✅ Task completed: ${task_title}\n${message}`
    });
  }

  res.status(200).send('OK');
});

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Custom Dashboard Updates

Update your internal dashboards in real-time: 
# Example webhook handler in Python/Flask
@app.route('/manus-webhook', methods=['POST'])
def handle_webhook():
    data = request.json
    event_type = data.get('event_type')
    task_detail = data.get('task_detail', {})

    # Update task status in your database
    if event_type == 'task_stopped':
        update_task_status(
            task_id=task_detail.get('task_id'),
            status='completed' if task_detail.get('stop_reason') == 'finish' else 'waiting',
            message=task_detail.get('message')
        )

    return '', 200

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Troubleshooting

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Common Issues

  • Webhook not receiving events: Verify your URL is accessible and returns 200 status
  • SSL/TLS errors: Ensure your endpoint uses valid HTTPS certificates
  • Timeout errors: Make sure your endpoint responds within 10 seconds

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Testing Your Webhook

You can test your webhook endpoint using tools like:
  • webhook.site for quick testing
  • ngrok for local development
  • Postman or curl for manual testing