What is a Claude Code Skill?

A Claude Code Skill is a specialized capability that enhances Claude's behavior during tasks by providing domain-specific guidance, best practices, and automated implementation patterns.

What is the '500-line rule' for skills?

It is a performance best practice recommending that SKILL.md files remain under 500 lines to ensure Claude processes the context efficiently without slowing down response times.

How do enforcement levels like 'BLOCK' work?

The BLOCK level physically prevents tool execution (like editing a file) until the developer complies with the skill's requirements, which is ideal for critical data integrity or security guardrails.

Can skills be triggered by file paths?

Yes, skills can be configured to activate automatically when specific file types, directories, or naming patterns (globs) are detected in the current workspace.

Claude Code Skill Developer

Name: Claude Code Skill Developer
Author: claudiodearaujo

byclaudiodearaujo

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Developer Tools

Standardizes the creation, management, and optimization of custom specialized skills for the Claude Code CLI environment.

The Skill Developer guide provides a comprehensive framework for building domain-specific capabilities within Claude Code. It enables developers to implement sophisticated trigger patterns, hook into prompt submission and tool execution phases, and enforce coding best practices through proactive suggestions or guardrail blocks. By following the Anthropic-recommended 500-line rule and progressive disclosure patterns, this skill ensures that Claude remains efficient while providing deep, context-aware assistance for any specialized workflow or organizational coding standard.

Key Features

01Advanced trigger configuration using keywords, regex intent patterns, and file globbing

020 GitHub stars

03Dual-hook architecture support for UserPromptSubmit and PreToolUse interventions

04Session-aware state management to prevent repetitive notifications and 'nagging'

05Multi-level enforcement options including BLOCK for guardrails and SUGGEST for guidance

06Standardized YAML frontmatter and automated skill-rules.json configuration patterns

Use Cases

01Creating custom organizational coding standards and automated guardrails

02Injecting domain-specific documentation and API patterns into Claude's context

03Debugging complex skill activation and trigger logic during local development

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add claudiodearaujo/sistema-de-narra-o-de-livro-front skill-developer

For use in Claude.ai and ChatGPT

Download Skill