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Claude Code's SKILL.md format explained: how to write skills that trigger correctly

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Claude Code skills are reusable, structured instruction sets designed to replace repetitive procedures users paste into chat sessions. Unlike entries in CLAUDE.md, a skill's body only loads into context when the skill is actually invoked, keeping overhead minimal. Each skill lives in a dedicated directory with a SKILL.md file containing frontmatter fields — most importantly a description, which Claude reads in every session to decide when to activate the skill. The description acts as the trigger mechanism, so it should mirror the natural phrases a user might say, while the body holds the full step-by-step procedure. Optional frontmatter settings like disable-model-invocation and allowed-tools give developers control over whether a skill fires automatically or only on explicit user command.

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