How does this skill improve performance?

By utilizing progressive disclosure, it keeps the main prompt small (under 500 lines) and only loads detailed domain knowledge when specifically needed, saving tokens and reducing model confusion.

What is a Claude Code Skill?

A Claude Code Skill is a specialized, filesystem-based capability that provides domain-specific guidance, best practices, and implementation patterns to enhance Claude's behavior during specific tasks.

Why use XML tags in SKILL.md files?

XML tags provide a clear, semantic structure that helps Claude distinguish between different types of instructions, leading to better instruction following and more reliable outputs compared to standard markdown headers.

What is the Router Pattern for skills?

The Router Pattern is an organizational structure that uses a central SKILL.md file to identify user intent and then routes the model to specific sub-files in workflows/ or references/ to keep context focused.

Claude Code Skill Builder

Name: Claude Code Skill Builder
Author: glittercowboy

byglittercowboy

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770

Developer Tools

Provides expert guidance and structured workflows for designing, building, and refining high-quality Claude Code Skills.

About

This skill serves as a comprehensive framework for developing modular, filesystem-based capabilities within Claude Code. It enforces industry-best practices such as the Router Pattern, XML-based prompting, and progressive disclosure to ensure skills are efficient, maintainable, and easy for Claude to navigate. Whether you are authoring a simple task-execution skill or a complex domain expertise knowledge base, this tool provides the necessary templates, workflows, and principles to optimize Claude's performance and output consistency.

Key Features

770 GitHub stars
Automated auditing and verification workflows to maintain skill quality and accuracy
Router pattern implementation for organizing complex skills into workflows and references
Standardized templates for workflows, references, and executable scripts
Progressive disclosure logic to keep SKILL.md files concise and context-efficient
Pure XML structural enforcement for cleaner prompting and better model instruction following

Use Cases

Converting monolithic prompt files into modular, router-based skills for better performance
Bootstrapping a new Claude Code skill from scratch using standardized directory structures
Auditing existing skills against best practices to improve instruction adherence and reliability

About

Key Features

770 GitHub stars
Automated auditing and verification workflows to maintain skill quality and accuracy
Router pattern implementation for organizing complex skills into workflows and references
Standardized templates for workflows, references, and executable scripts
Progressive disclosure logic to keep SKILL.md files concise and context-efficient
Pure XML structural enforcement for cleaner prompting and better model instruction following

Use Cases

Converting monolithic prompt files into modular, router-based skills for better performance
Bootstrapping a new Claude Code skill from scratch using standardized directory structures
Auditing existing skills against best practices to improve instruction adherence and reliability