Plugin Registry

Claude Code Plugin Registry

Expert knowledge for understanding and troubleshooting the Claude Code plugin registry.

When to Use This Skill

Registry Location

The plugin registry is stored at:

~/.claude/plugins/installed_plugins.json

This file tracks all installed plugins across all projects.

Registry Structure (v2)

{
  "version": 2,
  "plugins": {
    "plugin-name@marketplace-name": [
      {
        "scope": "project",
        "projectPath": "/path/to/project",
        "installPath": "~/.claude/plugins/cache/marketplace/plugin-name/1.0.0",
        "version": "1.0.0",
        "installedAt": "2024-01-15T10:30:00Z",
        "lastUpdated": "2024-01-15T10:30:00Z",
        "gitCommitSha": "abc123"
      }
    ]
  }
}

Each plugin key maps to an array of installations (supporting multiple scopes).

The registry holds version pointers, not plugin copies. Every entry's installPath — at any scope — resolves under ~/.claude/plugins/cache/<marketplace>/<plugin>/<version>/, and nothing is written inside the project. Measured 2026-09-13 on one machine: all 44 project-scope and all 50 user-scope entries pointed into that one cache. So an entry is a claim about which cached version this scope uses, and two entries for one plugin mean two version directories sitting side by side.

Field Reference

Installation Scopes

User Scope (global, default)

/plugin install my-plugin@marketplace

• "scope": "user" in registry entry
• No projectPath field
• Available in all projects

Project Scope

/plugin install my-plugin@marketplace --scope project

• "scope": "project" in registry entry
• Has projectPath set to installation directory
• Should only be active in that project
• Bug #14202: Still shows as "installed" in other projects

A project entry is also created without anyone running an install command. At session start Claude Code logs Syncing installed_plugins.json with enabledPlugins from all settings.json files and then one Added <plugin>@<marketplace> installation for scope project (<projectPath>) per plugin the project's committed .claude/settings.json enables. The version recorded is whatever is current at that moment, and it does not follow later updates to the user-scope install — so the entry starts correct and drifts. See "Which install loads" below for the consequence.

Known Issue: #14202

Problem: Project-scoped plugins incorrectly appear as globally installed.

Root Cause: Inconsistent projectPath checking:

Symptoms:

1. Plugin shows "(installed)" checkmark in Marketplaces view
2. /plugin install says "already installed"
3. Plugin doesn't appear in Installed tab for current project
4. Plugin doesn't actually work in current project

Workaround: Manually edit the registry to add an entry for the current project.

Which Install Loads, and Why a Project Can Run an Old Version

When a plugin has both a project entry for the current directory and a user entry, the project entry decides which cached version loads there, and it does not follow the user install's updates — so a project can quietly run a version behind the rest of the machine, missing skills that a newer version added.

claude plugin details reports the user version from inside such a project and so cannot detect this; claude plugin list --json reports each row's scope but not which row wins. The reliable read is the debug log:

CLAUDECODE= claude -p "reply ok" --debug plugins --debug-file /tmp/p.log

Then read its skillsPath: lines for the version actually loaded.

Removing a lagging row is a repair, not a fix — the next session in that project re-creates it, so the lag returns after the next release. Measured on one machine: a sweep removing 462 entries left zero lagging on 2026-09-13, and 19 had returned by 2026-09-17.

For the measured evidence, the query that finds lagging rows, the uninstall-rewrites-committed-settings hazard and its snapshot-restore procedure, and the upstream report, see REFERENCE.md.

Manual Registry Operations

View Registry

jq . ~/.claude/plugins/installed_plugins.json

List All Plugins

jq -r '.plugins | keys[]' ~/.claude/plugins/installed_plugins.json

Find Project-Scoped Plugins

jq '.plugins | to_entries[] | .value[] | select(.scope == "project") | {projectPath, version}' ~/.claude/plugins/installed_plugins.json

Find Orphaned Entries

Use the Read tool to read ~/.claude/plugins/installed_plugins.json, then check each projectPath with test -d.

Backup Registry

cp ~/.claude/plugins/installed_plugins.json ~/.claude/plugins/installed_plugins.json.backup

Fixing Registry Issues

Remove Orphaned Entry

1. Read ~/.claude/plugins/installed_plugins.json with the Read tool
2. Back up with cp ~/.claude/plugins/installed_plugins.json ~/.claude/plugins/installed_plugins.json.backup
3. Remove the orphaned entry from the plugins object
4. Write the updated JSON with the Write tool

Add Entry for Current Project

1. Read the registry with Read tool
2. Add a new entry to the plugin's array with scope: "project" and current projectPath
3. Write the updated JSON with Write tool

Convert Project-Scoped to User (Global)

1. Read the registry with Read tool
2. Change "scope": "project" to "scope": "user" and remove projectPath
3. Write the updated JSON with Write tool

Project Settings Integration

Project-scoped plugins also need entries in .claude/settings.json. enabledPlugins is an object mapping plugin@marketplace to a boolean — not an array of names:

{
  "enabledPlugins": {
    "plugin-name@marketplace": true
  }
}

Without this, even a correctly registered project-scoped plugin won't load. And because session start syncs the registry from these keys, every plugin enabled here also gains a project-scope registry row.

Troubleshooting Checklist

1. Plugin shows installed but doesn't work

   • Check if projectPath matches current directory
   • Check .claude/settings.json for enabledPlugins
   • Run /health:plugins for diagnosis

2. Can't install plugin (already installed)

   • Check registry for existing entry
   • Check if entry has different projectPath
   • Use /health:plugins --fix or manual edit

3. Plugin works in one project but not another

   • Likely a project-scoped plugin
   • Need separate registry entry per project
   • Or convert to global scope

4. A skill or command is missing in one project only, or behaves as an older version

   • Suspect a project entry lagging the user install — run the jq query above
   • Confirm with --debug plugins and read the skillsPath: version
   • claude plugin details reports the user version here and will mislead you

5. Registry file is corrupted

   • Restore from backup if available
   • Or delete and reinstall plugins
   • Location: ~/.claude/plugins/installed_plugins.json

Agentic Optimizations

Quick Reference

Registry Path

~/.claude/plugins/installed_plugins.json

Key Format

{plugin-name}@{marketplace-name}

Scope Indicator

• "scope": "project" + projectPath → Project-scoped
• "scope": "user" → Global (user-wide)

After Editing

Always restart Claude Code for registry changes to take effect.