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Looking for more than a WebhookDebugger?
WebhookDebugger.com is a basic webhook testing tool for humans. HookSense is the agent-native callback layer: your AI agent creates a callback endpoint and awaits the result over MCP with wait_for_callback, signature-verified — no polling.
Last updated: June 2026
Feature Comparison
| Feature | HookSense | WebhookDebugger |
|---|---|---|
| Agent awaits over MCP (wait_for_callback) | ||
| MCP server (npx @hooksense/mcp) | ||
| Signature verification | ||
| Replay callback | ||
| Auto-retries / dead-letter | Soon | |
| Custom responses | ||
| Permanent callback URL | ||
| Search & filter | Basic | |
| Export as cURL/JSON |
Pricing Comparison
| Tier | HookSense | WebhookDebugger |
|---|---|---|
| Free | $0 (callback endpoints + MCP) | $0 (basic) |
| Hook | From $29/mo (early access) | N/A |
Why Choose HookSense
- Your agent awaits the result over MCP with wait_for_callback — no polling
- MCP-native: npx @hooksense/mcp adds the callback toolset to Claude or Cursor
- Signature-verified callbacks so your agent only acts on trusted payloads
- replay_callback to re-fire a captured callback when a step needs another try
- Custom responses with configurable status code, body, and headers
- Auto-retries and dead-letter coming soon (paid plans in early access)
Frequently asked
- Is HookSense a WebhookDebugger alternative?
- For the agent-callback use case, yes — and a different category. WebhookDebugger is a basic human tester; HookSense lets your AI agent create an endpoint and await a signed result over MCP with wait_for_callback.
- Can an agent block on a result with WebhookDebugger?
- No. There's no wait_for_callback primitive and no MCP server. With HookSense the agent calls wait_for_callback over MCP and blocks until the signed payload arrives.
- How do I verify callback signatures with HookSense?
- verify_signature is part of the MCP toolset. Add your signing secret once and HookSense verifies HMAC signatures on every inbound callback before your agent acts on it.
Give your agent a callback URL
Add HookSense to Claude or Cursor with `npx @hooksense/mcp`. Free to start; request early access for paid plans.
Get a callback URL