Skills

Skills are specialized prompt templates that give Claude domain-specific expertise for particular types of work.

How Skills Work

A skill is a Markdown document with structured guidance. When installed for a session, its content is injected into the system prompt, giving Claude a methodology to follow for that type of task.

Skills don't add new tools — they augment Claude's behavior through prompt engineering. A "Code Review" skill, for example, provides a structured checklist covering correctness, security, performance, and maintainability.

Installing Skills

Open the Skills panel in your session
Browse or search available skills by category
Click Install to activate a skill for the current session

Skills can be installed and uninstalled per-session as needed.

Built-In Skills

ChatML ships with 19 built-in skills across four categories:

Development

Skill	Description
Test-Driven Development	Red-Green-Refactor cycle guidance
Unit Testing Guide	Patterns, test doubles, async testing
Systematic Debugging	Hypothesis-driven bug finding
Code Review Assistant	Correctness, security, maintainability checks
API Design	REST/GraphQL conventions and patterns
Refactoring Guide	Safe, phased refactoring strategies
Performance Optimization	Profiling and bottleneck identification

Security

Skill	Description
Security Audit	OWASP Top 10 vulnerability scanning
Dependency Review	License, maintenance, and security evaluation

Documentation

Skill	Description
Brainstorming	Structured idea exploration
Writing Plans	Implementation plan creation
Architecture Decision Records	Structured decision capture
Technical Writing	Documentation authoring
Project Scaffolding	New project setup guidance

Version Control

Skill	Description
Git Commit Helper	Conventional commit messages
PR Creation	Well-documented pull requests
Branch Management	Naming, merging, and cleanup
Code Migration	Framework and library migration
Accessibility Audit	WCAG compliance checking