How to Build a Claude Code Skill That Triggers Automatically by Context

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Claude Code supports 'skills' — Markdown-based instruction sets stored in designated folders that the AI invokes autonomously when a task matches their description, unlike slash commands which require manual input. A skill consists of a folder containing a SKILL.md file with YAML frontmatter defining a name and description, plus a body outlining the procedure to follow. Skills can be scoped to a project by placing them in .claude/skills/ within a repo, or made personal by storing them in ~/.claude/skills/ for use across all projects. The description field is the most critical component, as Claude uses it to decide whether the current task warrants invoking the skill — vague descriptions often cause skills to be overlooked. Writing descriptions as explicit trigger lists naming concrete situations, verbs, and file types significantly improves how reliably a skill gets selected.

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