MCP lets your coding agent call webhook tools directly: create endpoints, send test payloads, inspect captured requests, and replay to local targets. You can keep the whole debug loop in a single chat instead of switching between tabs.
Why MCP helps webhook debugging
- Fast iteration: no manual copy/paste between tools.
- Better context: the agent sees recent requests and can compare attempts.
- Automation-friendly: the same flow can be reused in scripts and checks.
1. Set up MCP server
npx @webhooks-cc/mcp setup codex --api-key whcc_...
After setup, confirm your agent can call tools like create_endpoint,send_webhook, and list_requests.
2. Example debug workflow
Create an endpoint named stripe-debug. Send a Stripe checkout.session.completed template to stripe-debug with secret whsec_dev. Show the last 3 requests for stripe-debug. Replay the latest request to http://localhost:3000/webhooks.
This sequence validates receive, inspect, and local handler behavior in one pass.
3. Use signed provider templates
The MCP send_webhook tool supports provider templates for Stripe, GitHub, Shopify, and Twilio. Pass provider, optional template, and a mock webhook secret to generate signature headers that match provider expectations.
Send a GitHub pull_request.opened template to repo-hooks with secret github_test_secret
4. Add guardrails
- Use dedicated endpoints per integration under test.
- Use test-only secrets, never production signing secrets.
- Replay only to trusted local or staging URLs.
See the full tool list in the MCP docs.