Claude Debug Plugin

Runtime debugging for Claude Code via instrumented fetch calls.

Installation

Via skills.sh

npx skills add pzep1/claudecode-debug-mode

Via Claude Code Plugin Marketplace

claude plugin marketplace add pzep1/claudecode-debug-mode
claude plugin install claude-debug-plugin@pzep1-claudecode-debug-mode

Local Development

npx skills add ./claudecode-debug-mode

Usage

Claude automatically uses this skill when you ask to debug runtime issues:

• "Can you help me debug why this async function times out?"
• "The state isn't updating correctly, can you trace through the execution?"
• "There's a race condition somewhere in the order processing"

How It Works

1. Start Debug Mode - Claude runs the bundled debug server from scripts/debug-server.js
2. Instrument Code - Claude inserts fetch() calls at strategic locations
3. Reproduce the Issue - You run your code and reproduce the bug
4. Analyze Logs - Claude reads .claude-debug/debug.log to identify the problem
5. Clean Up - Claude removes instrumentation and deletes .claude-debug/

Instrumentation

Claude inserts fetch calls like this:

fetch("http://localhost:3333/debug", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({ label: "function-entry", data: { arg1, arg2 } }),
}).catch(() => {});

Plugin Structure

claudecode-debug-mode/
├── .claude-plugin/
│   ├── marketplace.json
│   └── plugin.json
├── scripts/
│   └── debug-server.js
└── skills/
    └── runtime-debugging/
        └── SKILL.md

License

MIT