AutoSkillUpdate: A Claude Code Plugin That Detects Outdated Skills

AutoSkillUpdate is a Claude Code plugin built specifically for Claude Code users to detect when their custom skills have become outdated due to codebase changes. The tool addresses the problem where skills written months ago continue teaching Claude old patterns while the actual codebase has evolved with new libraries, different patterns, or updated conventions.

How It Works

When you run /updateskill, the plugin reads your source files, checks dependencies, and pulls the latest library documentation through Context7. It then generates a drift report with specific evidence including file paths and line references.

Examples of what it catches:

• Your skill says "use styled-components for styling" but 47 files in your codebase use Tailwind
• Your backend skill references Firebase Functions v1 patterns but you migrated to v2
• Your team adopted Zustand but the skill doesn't mention it

The plugin can rewrite the skill for you, but only after showing you the diff and getting your confirmation. Nothing gets written without approval.

Development Details

The entire plugin was built using Claude Code. The orchestrator skill, codebase analyzer agent, doc-fetcher agent, and skill-writer were all developed and iterated on inside Claude Code sessions. Claude helped architect the agent workflow, write the drift detection logic, and handle the parallel agent dispatch pattern.

Installation and Usage

Install from GitHub:

claude plugin marketplace add Snowtumb/claude-auto-skill-update
claude plugin install auto-skill-update@claude-auto-skill-update

Or run locally:

claude --plugin-dir /path/to/claude-auto-skill-update

Then run /updateskill in any project that has custom skills.

Additional options:

• --dry-run mode to see what's outdated without changing anything
• --all for batch updating every skill at once

The plugin is MIT licensed and available on GitHub: https://github.com/Snowtumb/claude-auto-skill-update