Plugin Release Process

Complete guide for releasing new versions of plugins in the MAG Claude Plugins marketplace.

Critical Understanding

Claude Code plugin discovery works through TWO configuration files that MUST BOTH BE UPDATED:

1. plugins/{plugin-name}/plugin.json - The plugin's own version metadata
2. .claude-plugin/marketplace.json - The marketplace catalog (what users see when browsing)

Why both?

• plugin.json - Defines the plugin itself (agents, commands, version)
• marketplace.json - The "catalog" that Claude Code reads for plugin discovery
• Users run /plugin marketplace update which reads marketplace.json
• If you only update plugin.json, users won't see the new version!

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Release Checklist

Step 1: Update Plugin Files

• plugins/{plugin-name}/plugin.json - Update version field
• plugins/{plugin-name}/agents/*.md - Add new agents (if any)
• plugins/{plugin-name}/commands/*.md - Update commands (if any)
• plugins/{plugin-name}/skills/*/SKILL.md - Add new skills (if any)

Step 2: Update Documentation

• CHANGELOG.md - Add new version entry at the top
• RELEASES.md - Add detailed release notes at the top
• CLAUDE.md - Update ALL version references (6+ locations)

Step 3: ⚠️ CRITICAL - Update Marketplace Catalog

File: .claude-plugin/marketplace.json

Update TWO fields:

1. Marketplace metadata version (line ~10):

   "metadata": {
     "version": "3.3.0"  // ← Update this
   }
   

2. Specific plugin version (in plugins array):

   "plugins": [
     {
       "name": "frontend",
       "version": "3.3.0",      // ← Update this (CRITICAL!)
       "description": "..."     // ← Update if description changed
     }
   ]
   

Step 4: Commit and Tag

# Commit all changes
git add -A
git commit -m "feat({plugin}): v{X.Y.Z} - {Feature summary}"

# Create tag (format: plugins/{plugin-name}/v{X.Y.Z})
git tag -a plugins/{plugin}/v{X.Y.Z} -m "..."

# Push
git push origin main
git push origin plugins/{plugin}/v{X.Y.Z}

Step 5: Verify

/plugin marketplace update mag-claude-plugins
# Should show new version ✅

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Common Mistakes

❌ #1: Forgot to update marketplace.json

Symptom: Users still see old version after /plugin marketplace update

Fix:

# Update .claude-plugin/marketplace.json
vim .claude-plugin/marketplace.json
# Update plugins[].version field

git add .claude-plugin/marketplace.json
git commit -m "fix(marketplace): Update {plugin} version to v{X.Y.Z}"
git push origin main

❌ #2: Wrong git tag format

Wrong: frontend-v3.3.0, v3.3.0, frontend/v3.3.0 Correct: plugins/frontend/v3.3.0 ✅

❌ #3: Inconsistent versions

Problem: plugin.json says v3.3.0 but marketplace.json says v3.2.0

Prevention: Use checklist, search for old version: grep -r "3.2.0" .

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Version Numbering

MAJOR (X.0.0): Breaking changes (removed agents, changed behavior) MINOR (x.Y.0): New features (new agents/commands, backward compatible) PATCH (x.y.Z): Bug fixes (no new features, backward compatible)

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Quick Reference

Minimal checklist:

1. ✅ Update plugins/{plugin}/plugin.json version
2. ✅ Update .claude-plugin/marketplace.json plugin version ⚠️ CRITICAL
3. ✅ Update CHANGELOG.md, RELEASES.md, CLAUDE.md
4. ✅ Commit: git commit -m "feat({plugin}): v{X.Y.Z} - {summary}"
5. ✅ Tag: git tag -a plugins/{plugin}/v{X.Y.Z} -m "..."
6. ✅ Push: git push origin main && git push origin plugins/{plugin}/v{X.Y.Z}
7. ✅ Verify: /plugin marketplace update shows new version

---

Example Release

# 1. Update versions
vim plugins/frontend/plugin.json          # version: "3.3.0"
vim .claude-plugin/marketplace.json       # plugins[0].version: "3.3.0"  ← DON'T FORGET!
vim CHANGELOG.md RELEASES.md CLAUDE.md

# 2. Commit
git add -A
git commit -m "feat(frontend): v3.3.0 - Multi-Model Plan Review"

# 3. Tag
git tag -a plugins/frontend/v3.3.0 -m "Frontend Plugin v3.3.0"

# 4. Push
git push origin main
git push origin plugins/frontend/v3.3.0

# 5. Verify
/plugin marketplace update mag-claude-plugins
# Output: frontend v3.3.0 ✅

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Troubleshooting

Q: Users still see old version A: Check .claude-plugin/marketplace.json - version must match plugin.json

Q: Tag already exists A: git tag -d {tag} then git push origin :{tag} then recreate

Q: How to test locally? A: /plugin marketplace add /path/to/claude-code

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Related: RELEASE_PROCESS.md - Full detailed documentation

Last Updated: November 13, 2025