Skill SemVer

Automatic version control for Claude Code Skills with semantic versioning, auto-backup, and changelog generation.

Features

• 🔄 Auto-backup: Automatically backs up SKILL.md on every edit
• 📋 Semantic Versioning: MAJOR.MINOR.PATCH format with pre-release support
• 📜 Changelog: Track changes with Keep a Changelog format
• 🎯 Zero config: Works out of the box with PostToolUse hook
• 📁 Organized: Clean releases/ folder for version history
• 📅 Auto-update: Automatically updates "Last Updated" date
• 🏷️ Pre-release: Support for alpha, beta, rc versions (e.g., 1.0.0-alpha, 2.0.0-beta.1)

Quick Start

1. Install the plugin

# Using Claude Code CLI
claude mcp add-json skill-semver '{"type":"stdio","command":"npx","args":["-y","skill-semver"]}'

2. Or clone locally

# Clone this repo
git clone https://github.com/cathy-kim/skill-semver.git

# Install dependencies
cd skill-semver
npm install

3. Add version header to your SKILL.md

# My Skill

> Description of the skill

**Version**: 1.0.0
**Last Updated**: 2026-01-30

4. Edit and save - backup is automatic!

The hook will create releases/v1.0.0_2026-01-30_SKILL.md automatically.

Plugin Structure

skill-semver/
├── .claude-plugin/
│   └── plugin.json           # Plugin metadata
├── skills/
│   └── versioning-guide/
│       └── SKILL.md          # Versioning guide skill
├── hooks/
│   ├── hooks.json            # Hook configuration
│   └── skill-version-hook.ts # Auto-backup hook
├── scripts/
│   └── migrate-skill-versioning.ts  # Migration script
├── examples/
│   └── example-skill/        # Example skill structure
├── package.json
├── CHANGELOG.md
├── RESEARCH-SUMMARY.md
└── README.md

Skill Folder Structure

After using this plugin, your skills will have this structure:

.claude/skills/your-skill/
├── SKILL.md          # Current version
├── CHANGELOG.md      # Change history
└── releases/         # Version snapshots
    ├── v1.0.0_2025-12-01_SKILL.md
    ├── v2.0.0-beta.1_2025-12-15_SKILL.md
    └── v3.0.0_2026-01-15_SKILL.md

Version Formats

Supported Versions

Format	Example	Description
Standard	1.2.3	MAJOR.MINOR.PATCH
Pre-release	1.0.0-alpha	Alpha version
Pre-release with number	2.0.0-beta.1	Beta version 1
Release candidate	3.0.0-rc.1	Release candidate
Build metadata	1.0.0+build.123	With build info

Version Bump Guide

Change Type	Version	Example
Breaking change	MAJOR	Workflow restructure
New feature	MINOR	Add new agent
Bug fix	PATCH	Fix typo

Initial Development (0.x.x)

Versions starting with 0. are marked as "Initial Development" and indicate the skill is not yet stable.

How It Works

1. PostToolUse Hook detects when you edit a SKILL.md file
2. Version Extraction reads the **Version**: X.X.X header
3. Last Updated automatically updates the date
4. Auto-backup creates releases/v{VERSION}_{DATE}_SKILL.md
5. CHANGELOG updates with new version entry
6. Skip duplicates - won't create backup if same version exists

Version Header Formats

The hook recognizes these version patterns:

**Version**: 1.0.0           ✓ Preferred
**Version**: 1.0.0-alpha     ✓ Pre-release
Version: 1.0.0               ✓ Alternative
# My Skill v1.0.0            ✓ In title

Migration

For existing skills without versioning:

# Run from your project root
npx tsx scripts/migrate-skill-versioning.ts

The migration script will:

• Create releases/ folders
• Add version headers to SKILL.md files
• Generate CHANGELOG.md from git history
• Migrate existing backup files

CHANGELOG Format

# Changelog - my-skill

## [1.1.0] - 2026-01-30

### Added
- New feature description

### Changed
- Updated behavior

### Fixed
- Bug fix description

What's New in v1.1.0

• Pre-release Support: Handle alpha, beta, rc versions
• Build Metadata: Support +build.123 suffixes
• Auto Last Updated: Automatically update the date field
• Performance: Reduced file reads from 2 to 1
• Cross-platform: Fixed path separator issues (Windows/Mac)

Requirements

• Claude Code CLI v1.0.33+
• Node.js 18+
• TypeScript (tsx)

License

MIT

Author

cathy-kim

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Made with ❤️ for the Claude Code community