repo-scan

SKILL.md

repo-scan

Every ecosystem has its own dependency manager, but no tool looks across C++, Android, iOS, and Web to tell you: how much code is actually yours, what's third-party, and what's dead weight.

When to Use

Taking over a large legacy codebase and need a structural overview

Before major refactoring — identify what's core, what's duplicate, what's dead

Auditing third-party dependencies embedded directly in source (not declared in package managers)

Preparing architecture decision records for monorepo reorganization

Installation
# Fetch only the pinned commit for reproducibility
mkdir -p ~/.claude/skills/repo-scan
git init repo-scan
cd repo-scan
git remote add origin https://github.com/haibindev/repo-scan.git
git fetch --depth 1 origin 2742664
git checkout --detach FETCH_HEAD
cp -r . ~/.claude/skills/repo-scan

Review the source before installing any agent skill.

Core Capabilities

Capability
Description

Cross-stack scanning
C/C++, Java/Android, iOS (OC/Swift), Web (TS/JS/Vue) in one pass

File classification
Every file tagged as project code, third-party, or build artifact

Library detection
50+ known libraries (FFmpeg, Boost, OpenSSL…) with version extraction

Four-level verdicts
Core Asset / Extract & Merge / Rebuild / Deprecate

HTML reports
Interactive dark-theme pages with drill-down navigation

Monorepo support
Hierarchical scanning with summary + sub-project reports

Analysis Depth Levels

Level
Files Read
Use Case

fast
1-2 per module
Quick inventory of huge directories

standard
2-5 per module
Default audit with full dependency + architecture checks

deep
5-10 per module
Adds thread safety, memory management, API consistency

full
All files
Pre-merge comprehensive review

How It Works

Classify the repo surface: enumerate files, then tag each as project code, embedded third-party code, or build artifact.

Detect embedded libraries: inspect directory names, headers, license files, and version markers to identify bundled dependencies and likely versions.

Score each module: group files by module or subsystem, then assign one of the four verdicts based on ownership, duplication, and maintenance cost.

Highlight structural risks: call out dead-weight artifacts, duplicated wrappers, outdated vendored code, and modules that should be extracted, rebuilt, or deprecated.

Produce the report: return a concise summary plus the interactive HTML output with per-module drill-down so the audit can be reviewed asynchronously.

Examples

On a 50,000-file C++ monorepo:

Found FFmpeg 2.x (2015 vintage) still in production

Discovered the same SDK wrapper duplicated 3 times

Identified 636 MB of committed Debug/ipch/obj build artifacts

Classified: 3 MB project code vs 596 MB third-party

Best Practices

Start with standard depth for first-time audits

Use fast for monorepos with 100+ modules to get a quick inventory

Run deep incrementally on modules flagged for refactoring

Review the cross-module analysis for duplicate detection across sub-projects

Links

GitHub Repository

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