Claude Code Skill Developer Guide FAQs

Question 1

How do I trigger a skill automatically?

Accepted Answer

Skills are triggered based on configurations in the skill-rules.json file, which supports keyword matching, intent patterns (regex), specific file paths (globs), or file content detection.

Question 2

What is the 500-line rule in Claude Code?

Accepted Answer

The 500-line rule is an Anthropic best practice recommending that SKILL.md files stay under 500 lines. This ensures the AI can process the instructions efficiently without exceeding context limits or losing focus.

Question 3

What are hooks in the Claude Code skill architecture?

Accepted Answer

Hooks are TypeScript scripts that run at specific lifecycle events: UserPromptSubmit runs before Claude sees a prompt, and PreToolUse runs before a tool like 'Edit' is executed.

Question 4

What is the difference between BLOCK and SUGGEST enforcement?

Accepted Answer

BLOCK enforcement physically prevents a tool from executing until a condition is met (critical for guardrails), while SUGGEST injects advice into the prompt context without stopping the workflow.

Question 5

How can I prevent a skill from repeating its advice too often?

Accepted Answer

Claude Code skills use session tracking via state files in the .claude/hooks/state/ directory to record when a skill has been used, allowing the system to skip redundant reminders in the same session.

Claude Code Skill Developer Guide

Key Features

Use Cases

Claude Code Skill Developer Guide

Key Features

Use Cases