Agent skills are packaged instruction sets that extend what an AI agent can do for a specific task: a workflow, a domain convention, a tool recipe. In Claude's ecosystem they live as SKILL.md files; other platforms ship comparable units under names like custom instructions, gems, or GPTs.
Skills multiply faster than any other agent asset because they are shareable and vendor-bundled. A scan of one machine found 3,073 SKILL.md files with 887 distinct contents — bundles, copies, and forks, most of them invisible to the person running the agent.
Treat skills like dependencies: one canonical version per skill in an inventory, explicit deployment to the machines that need it, and drift detection for local edits.
This entry is part of the untactit glossary. Definitions draw on measured write-ups published on the blog.
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