Does this skill help with refactoring?

Absolutely. By identifying similar but slightly different implementations, it provides a perfect starting point for extracting shared logic into generic, reusable abstractions.

When does the Anti-Duplication skill start working?

The skill auto-triggers as soon as you use action words like 'create', 'implement', 'add', or 'build' when describing a new feature or code artifact.

Can I still write new code if a similar pattern exists?

Yes. If the existing patterns don't meet your requirements, the skill will ask you to justify why a new implementation is necessary, ensuring the decision is documented.

What types of files does it search?

It is technology-agnostic and uses flexible search strategies to scan everything from React components and TypeScript services to SQL schemas and API routes.

Anti-Duplication

Name: Anti-Duplication
Author: marcusgoll

bymarcusgoll

•

Productivity & Workflow

Enforces the DRY principle by searching your codebase for existing patterns and components before implementing new code.

The Anti-Duplication skill is a powerful architectural guardian for Claude Code that prevents technical debt by proactively identifying existing code patterns. When a developer asks to build new functionality, the skill automatically triggers a multi-phase search across the repository to find similar endpoints, services, or UI components. By presenting options to reuse, extend, or abstract existing logic, it ensures that your codebase remains lean, consistent, and maintainable while significantly reducing the long-term burden of inconsistent bug fixes and redundant implementations.

Key Features

01Multi-layered search strategies using keyword matching, file patterns, and structural regex

02Parallel execution of searches to analyze large codebases in seconds

03Intelligent classification of results into exact matches, close matches, and pattern matches

04Structured decision-making process for code reuse, extension, or justified new creation

0518 GitHub stars

06Automatic trigger on implementation keywords like 'create', 'build', and 'add'

Use Cases

01Standardizing API endpoints by reusing existing authentication and validation middleware

02Maintaining database model consistency by checking for existing schemas before creating new entities

03Consolidating UI components by identifying similar rendering patterns across different domains

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add marcusgoll/spec-flow anti-duplication

For use in Claude.ai and ChatGPT

Download Skill