Code Reaper

CodeReaper is an AI-driven MCP tool for Cursor that finds and removes dead JavaScript by exploring real UIs and capturing V8 coverage

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CodeReaper

CodeReaper is an AI-driven MCP tool for Cursor that finds and removes dead JavaScript by exploring real UIs and capturing V8 coverage.

Key Features

  • Autonomous UI exploration via the Index browser agent
  • V8 precise coverage to identify zero-execution functions
  • Risk scoring and removal recommendations
  • Patch generation and optional verification replay
  • MCP integration for Cursor workflows

Quick Install

pip install codereaper
playwright install chromium
codereaper

When you first run codereaper, it prompts for your Gemini API key and saves it in your global ~/.cursor/mcp.json so Cursor can invoke it later.

Alternative Install

# pipx
pipx run codereaper

Prerequisites

  • Python 3.11+
  • Playwright Chromium (installed via playwright install chromium)
  • A Gemini API key (or OpenAI / Anthropic if you change providers)

Quick Start

  1. Install and run codereaper (it updates ~/.cursor/mcp.json)
  2. Restart Cursor
  3. Ask the assistant:

    "Find dead JavaScript code on http://localhost:3000"

Usage

Command:

codereaper

Example scan with local source mapping:

"Find dead code on http://localhost:3000, source is in ./test_site"

MCP Tools

ToolDescription
find_dead_codeFull pipeline: scan + analyze. Returns dead-code report with file paths, line numbers, risk scores, and removal recommendations.
scan_websiteScan only (no analysis). Returns scan_id for later use.
analyze_dead_codeAnalyze a completed scan. Takes scan_id.
generate_patchesGenerate unified diffs to remove dead code (conservative / balanced / aggressive).
get_patch_diffRetrieve the combined diff for a patch.
apply_patchApply a patch to source files (stores snapshots for rollback).
verify_patchRe-run the browser agent to check for regressions after patching.
rollback_patchRestore original files from pre-patch snapshots.
list_scansList recent scans.
get_scan_statusGet detailed status of a scan.

Troubleshooting

  • If the browser doesn’t open, install Chromium: playwright install chromium
  • If the scan fails with key errors, ensure GEMINI_API_KEY exists in ~/.cursor/mcp.json
  • If local pages don’t load, confirm your dev server is running and reachable
  • If Gemini rate limits hit, retry after the quota window resets

Update

  • 02-09-2026: v0.2.3 release

Issues & Feedback

Open an issue with steps to reproduce and logs if possible. Feedback and suggestions are welcome.

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