Is this skill specific to the Go programming language?

While the logic applies to many environments, this skill features specific optimizations for Go, such as gopls integration, slice pre-allocation, and race-condition checks.

How does it ensure code safety during refactoring?

It follows a strict TDD methodology where tests are written and confirmed to fail before any production code is modified, followed by static analysis and race checks.

Does this skill change my public API?

No, the primary goal is to improve internal quality and maintainability without changing external behavior, APIs, or persistence formats.

Can I use this for adding new features?

This skill is specifically designed for refactoring and technical debt reduction. Feature development should be handled by other skills to maintain scope clarity.

What is Serena MCP's role in this skill?

Serena MCP provides semantic search and pinpoint editing capabilities, allowing Claude to find and edit specific symbols without reading entire large files.

Codegen Refactor Specialist

Name: Codegen Refactor Specialist
Author: nihiyama

bynihiyama

•

Security & Testing

Refactors codebases using a TDD approach to improve internal quality, performance, and race safety without altering external behavior.

The Codegen Refactor skill automates the process of improving existing codebases by strictly following Test-Driven Development (TDD) principles and project-specific conventions. By analyzing GitHub Issues and README documentation, it identifies necessary structural improvements—such as performance optimizations and race-safety enhancements—while ensuring that external APIs and public interfaces remain unchanged. It leverages semantic search to minimize unnecessary file reading and ensures all changes are backed by passing tests, static analysis, and race-condition checks.

Key Features

01Pinpoint semantic code editing with Serena MCP integration

02Automated race-condition detection and thread-safety enforcement

032 GitHub stars

04Test-Driven Refactoring (TDD workflow) from Issues

05Performance optimization including pre-allocation and zero-copy patterns

06Context-aware code style matching for existing Go projects

Use Cases

01Hardening shared state logic to prevent data races and synchronization bugs

02Improving internal code maintainability without breaking existing APIs or exports

03Optimizing performance in high-concurrency Go applications and hot paths

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add nihiyama/ffq codegen-refactor

For use in Claude.ai and ChatGPT

Download Skill