Study finds Claude Code skill auto-invocation depends entirely on description keywords

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A developer experiment on DEV Community tested how Claude Code decides whether to automatically invoke a custom skill, running 38 headless sessions across seven description variants of a single commit-message skill. The key finding was that auto-invocation depended on whether the skill's one-line listing description contained words matching the user's request, regardless of which field those words appeared in. A vague description like 'Helps with git stuff' triggered zero invocations across six runs, while specific descriptions and even a file with no frontmatter but a relevant first line each achieved a perfect six-out-of-six invocation rate. The tests were conducted on Claude Code version 2.1.273 on September 16, 2026, using isolated directories to eliminate interference from personal settings or bundled skills. The experiment also found that a dedicated 'when_to_use' field offered no advantage over simply placing the right keywords in the description itself.

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