Webhook Crash Lab

Name: Webhook Crash Lab
Author: Krrishkumar125

by Krrishkumar125version 0.2.4i★ –iRuns on your computer

Registry nameio.github.Krrishkumar125/webhook-crash-lab-mcp

Install

Overview

Description from the maker (original English)

Lets coding agents crash-test webhook handlers and re-run until they survive retries.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Developer tools

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
The registry lists no key to fill in.

You need

npmNode.js installed (for the npx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "webhook-crash-lab": {
      "command": "npx",
      "args": [
        "-y",
        "webhook-crash-lab-mcp"
      ]
    }
  }
}

Run this in your terminal

claude mcp add webhook-crash-lab -- npx -y webhook-crash-lab-mcp

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "webhook-crash-lab": {
      "command": "npx",
      "args": [
        "-y",
        "webhook-crash-lab-mcp"
      ]
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "webhook-crash-lab": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "webhook-crash-lab-mcp"
      ]
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 8, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account Krrishkumar125, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Developer toolsi

More stars than 0% of the other 4919 servers in this category
Published to the registry more recently than 80% of the other 4919 servers in this category
Basic checks equal to or better than 100% of the other 4919 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Webhook Crash Lab safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (0.2.4) reached the registry 9 days ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: GitHub, Desktop Commander, Cloudflare MCP

Alternatives

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Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

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Desktop Commander

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Cloudflare MCP

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Install

README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

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](https://github.com/Krrishkumar125/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.

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

Webhook Crash Lab

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Developer toolsi

Common questions

Alternatives

GitHub

Desktop Commander

Cloudflare MCP

README from the maker

webhook-crash-lab-mcp

Tools

60-second start

or the full plugin (MCP server + skill):

/plugin marketplace add Krrishkumar125/webhook-crash-lab-mcp

/plugin install webhook-crash-lab@webhook-crash-lab

Safety

Related

Sibling packages

License