Originally published at claudeguide.io/claude-code-skills-overview
Claude Code Skills Explained: What They Are & When to Use Them (2026)
Claude Code Skills are reusable, AI-callable workflows defined in SKILL.md files in your ~/.claude/skills/ directory. Each skill is auto-discovered by Claude Code, can be invoked via the Skill tool, and replaces what would otherwise be one-off prompts copy-pasted between sessions — turning 30-line instructions into a single /skill-name call. Skills are how power users compress repetitive workflows (code review, deployment, content generation, audit) into reusable building blocks. If you find yourself pasting the same instructions into Claude Code multiple times per week, a skill replaces them.
This guide covers the model: what counts as a skill, how Claude discovers them, when to use a skill vs a slash command vs a CLAUDE.md instruction, and what's already in the public skill library.
What is a Skill, exactly?
