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Lets coding agents crash-test webhook handlers and re-run until they survive retries.
About
Lets coding agents crash-test webhook handlers and re-run until they survive retries.
Security Report
Valid MCP server (5 strong, 3 medium validity signals). No known CVEs in dependencies. Package registry verified. Imported from the Official MCP Registry.
12 files analyzed · 1 issue found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
Permissions Required
This plugin requests these system permissions. Most are normal for its category.
How to Install
Add this to your MCP configuration file:
{
"mcpServers": {
"io-github-krrishkumar125-webhook-crash-lab-mcp": {
"args": [
"-y",
"webhook-crash-lab-mcp"
],
"command": "npx"
}
}
}Documentation
View on GitHubFrom the project's GitHub README.
webhook-crash-lab-mcp
Coding agents write webhook handlers that work for one test event and break in production on retries, duplicates and forged signatures. This package gives them a loop: run webhook-crash-lab → read structured failures with fix hints → fix → re-run.
It ships three things:
| What | Where | |
|---|---|---|
| MCP server | webhook-crash-lab-mcp (stdio, official MCP TypeScript SDK) | src/ |
| Claude Code plugin | skill + MCP server config | .claude-plugin/, skills/, .mcp.json |
| Codex / any-agent skill | same skill in the open Agent Skills format, plus an AGENTS.md snippet | .agents/skills/, docs/AGENTS-snippet.md |
Tools
| Tool | Input | Returns |
|---|---|---|
run_crash_lab | configPath, cwd?, scenarios?, reportPath? | ok, counts, failures[] (id, failed checks, why, fix) in fix order, notTested[], nextSteps[] |
run_demo | mode: "broken" | "fixed" | same shape, against the built-in demo app (no config needed) |
explain_report | reportPath or report (JSON from webhook-crash-lab run --json) | same shape, e.g. for a CI report |
list_scenarios | – | every scenario with what / why / fix |
Every result comes back as text for the model and structuredContent (with an outputSchema) for clients.
Errors such as a missing or invalid config come back as isError results, not crashes.
60-second start
Claude Code
claude mcp add webhook-crash-lab -- npx -y webhook-crash-lab-mcp@0.2.4
# or the full plugin (MCP server + skill):
# /plugin marketplace add Krrishkumar125/webhook-crash-lab-mcp
# /plugin install webhook-crash-lab@webhook-crash-lab
Codex
codex mcp add webhook-crash-lab -- npx -y webhook-crash-lab-mcp@0.2.4
mkdir -p .agents/skills && cp -r node_modules/webhook-crash-lab-mcp/.agents/skills/webhook-crash-lab .agents/skills/
Cursor / other MCP clients
{
"mcpServers": {
"webhook-crash-lab": { "command": "npx", "args": ["-y", "webhook-crash-lab-mcp@0.2.4"] }
}
}
The examples pin the version so npx never silently runs a newer release. To update, check the latest with npm view webhook-crash-lab-mcp version, read the releases, then change @0.2.4 to the new version in your MCP config and restart the client.
Then ask: "Run the webhook crash lab demo", or "Make my Stripe webhook pass webhook-crash-lab".
Paste docs/AGENTS-snippet.md into AGENTS.md / CLAUDE.md to make it a standing rule.
Safety
run_crash_lab imports your crash-lab config (.mjs/.js/.cjs, or .ts/.mts/.cts via the bundled jiti) (it is code, like any config file) and sends requests to
its target. Point configs at a local server and a test database and secret only. The skill tells
agents never to use production URLs or live secrets.
Related
- webhook-crash-lab: the CLI/library this wraps
- eslint-plugin-webhook-safety and eslint-plugin-bullmq: the same bugs, caught statically
Sibling packages
Other tools by the same author:
- secret-blast-radius: what a malicious npm install could steal, plus a rotation plan
- zod-india: Zod schemas for GSTIN, PAN, IFSC, UPI and Aadhaar
- create-bullmq-app: scaffold a production BullMQ + TypeScript service
- webhook-crash-lab: crash-test webhook handlers against duplicates and races
- eslint-plugin-bullmq: lint rules for BullMQ production pitfalls
- eslint-plugin-webhook-safety: lint rules for unsafe Stripe webhook handlers
License
MIT © Krrish Kumar
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