webhook-mcp-server
Provides an MCP (Model Context Protocol) server that wraps webhook.site capabilities: creating and managing webhook endpoints (HTTP), and retrieving captured HTTP requests, emails, and DNS lookups. It also exposes tools for waiting/polling for new events and for generating common security test payloads (e.g., SSRF/XSS canary-style artifacts) and exporting captured data.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Strengths: uses HTTPS-oriented webhook.site endpoints by design (webhook URLs are shown as https://). Risks/unknowns: the README does not document how webhook.site credentials are provided or protected within the MCP server process, nor does it describe access control for created tokens/captured data. Security/bounty tooling implies users may generate OOB payloads; this increases the importance of external authorization controls and careful handling of captured sensitive data. Dependency hygiene and CVE status cannot be assessed from provided content; only minimal dependencies are listed (mcp, httpx).
⚡ Reliability
Best When
You want an agent-friendly interface (MCP tools via stdio) to quickly create webhook.site endpoints and programmatically capture/inspect resulting HTTP/email/DNS events for testing and debugging.
Avoid When
You require explicit, documented security controls for access to stored captures; you also want formal pagination/idempotency/retry guarantees beyond what’s documented in the README.
Use Cases
- • MCP-based webhook testing and debugging (create webhook, wait for requests, inspect captured data)
- • Monitoring and searching captured HTTP requests (filters, exports, statistics)
- • Email capture/testing (create temp inboxes, extract links)
- • DNS lookup capture/testing
- • Webhook-driven API testing (custom responses, CORS/timeout behaviors)
- • Security/bounty workflows that need out-of-band (OOB) callback/canary-style observation
- • Load testing via batch request sending and subsequent data export
Not For
- • Production handling of sensitive inbound traffic as a general webhook receiver (it’s a testing/inspection tool)
- • High-assurance security testing without appropriate legal authorization and safeguards
- • Environments needing strong enterprise authentication/authorization controls at the MCP layer (not evidenced in README)
Interface
Authentication
The README describes usage via MCP (stdio) but does not document authentication mechanisms for the MCP server or webhook.site integration (e.g., API keys, tokens, or how credentials are supplied). Authentication details appear to be handled indirectly via webhook.site tokens/endpoints rather than MCP-layer auth documentation.
Pricing
Pricing for the underlying webhook.site service is not provided in the README content shown.
Agent Metadata
Known Gotchas
- ⚠ Because the MCP server likely wraps an external SaaS (webhook.site), agent workflows may depend on webhook token state and eventual arrival of requests/emails/DNS lookups; the README emphasizes waiting/polling but does not document timeout/retry semantics or race conditions.
- ⚠ Security-related helper tools (SSRF/XSS/canaries) can generate payloads that may cause unintended network interaction; agents should still enforce strict safety/authorization checks externally.
- ⚠ The README documents many tools, but it does not show formal tool schemas, parameter constraints, or example error responses; agents may need to handle unexpected tool failures or external-service errors.
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Scores are editorial opinions as of 2026-04-04.