Claude Code Skills(2025年-)。Skills(stateful workflow・projectSettings:skill-name・YAML+Markdown declarative・$0 OSS)・Personal Skills(~/.claude/skills/)・Project Skills(.claude/commands/)・Examples: glossary-batch・article-batch・doc-audit・uiux-review・perf-audit・cleanup-audit・自作Skill Markdown 1file定義・Argument support($ARGUMENTS)・Tool restriction可・MCP integration可・Anthropic公式 Skills repo(GitHub)・Community Skills exchange(Smithery類似 future)・Cursor Custom Modes類似・2026年 Skills市場拡大、Workflow共有化進行。