Detect Duplicate Files

by @Sounder25 in Development

# Install this skill:

npx skills add Sounder25/Google-Antigravity-Skills-Library --skill "Detect Duplicate Files"

Install specific skill from multi-skill repository

# Description

Identify duplicate files across the workspace using SHA256 hashing to reduce redundancy and confusion.

# SKILL.md

name: Detect Duplicate Files
description: Identify duplicate files across the workspace using SHA256 hashing to reduce redundancy and confusion.
version: 1.0.0
author: Antigravity Skills Library
created: 2026-01-16
leverage_score: 2/5

SKILL-014: Detect Duplicate Files

Overview

Scans the workspace for identical files (by content, not name) to detect redundancy, copy-paste errors, or accidental forks. Generates a report suggesting deduplication actions.

Trigger Phrases

find duplicates
check for duplicate files
scan redundancy

Inputs

Parameter	Type	Required	Default	Description
`--workspace-path`	string	No	Current directory	Root to scan
`--min-size`	int	No	0	Minimum file size in bytes to check
`--exclude`	string[]	No	`node_modules`, `.git`, `bin`, `obj`	Directories to ignore

Outputs

1. DUPLICATE_REPORT.md

Summary of found duplicates:

# Duplicate File Report

**Total Duplicates:** 12
**Wasted Space:** 4.5 MB

## Group 1 (Hash: a1b2...)
- `src/utils/math.ts` (Original?)
- `src/legacy/math_copy.ts`

## Group 2 (Hash: c3d4...)
- `config/settings.json`
- `deploy/settings.prod.json`

Implementation

Script: find_duplicates.ps1

recurses through directory (respecting excludes).
Calculates SHA256 hash of every file.
Groups by hash.
Filters groups with count < 2.
Generates Markdown report.

Use Cases

Cleanup: Reducing repo size by removing accidental copies of large assets.
Refactoring: Finding code that was copy-pasted instead of shared.

# Supported AI Coding Agents

This skill is compatible with the SKILL.md standard and works with all major AI coding agents:

⚡ Amp 🚀 Antigravity 🤖 Claude Code 🦀 Clawdbot 📝 Codex ▶️ Cursor 🤖 Droid 💎 Gemini CLI 🐙 GitHub Copilot 🪿 Goose 📊 Kilo Code 🔧 Kiro CLI 💻 OpenCode 🦘 Roo Code 🌲 Trae 🏄 Windsurf

Learn more about the SKILL.md standard and how to use these skills with your preferred AI coding agent.