Agent Skills: Claude Skills Troubleshooting

Claude Skills Troubleshooting

Overview

Diagnose and resolve common Claude Code plugin and skill configuration issues. This skill provides systematic debugging workflows for plugin installation, enablement, and activation problems.

Quick Diagnosis

Run the diagnostic script to identify common issues:

python3 scripts/diagnose_plugins.py

The script checks:

• Installed vs enabled plugins mismatch
• Missing enabledPlugins entries in settings.json
• Stale marketplace cache
• Invalid plugin configurations

Common Issues

Issue 1: Plugin Installed But Not Showing in Available Skills

Symptoms:

• /plugin shows plugin as installed
• Skill not appearing in Skill tool's available list
• Plugin metadata exists in installed_plugins.json

Root Cause: Known bug (GitHub #17832) - plugins are added to installed_plugins.json but NOT automatically added to enabledPlugins in settings.json.

Diagnosis:

# Check if plugin is in installed_plugins.json
cat ~/.claude/plugins/installed_plugins.json | grep "plugin-name"

# Check if plugin is enabled in settings.json
cat ~/.claude/settings.json | grep "plugin-name"

Solution:

# Option 1: Use CLI to enable
claude plugin enable plugin-name@marketplace-name

# Option 2: Manually edit settings.json
# Add to enabledPlugins section:
# "plugin-name@marketplace-name": true

Issue 2: Understanding Plugin State Architecture

Key files:

| File | Purpose | |------|---------| | ~/.claude/plugins/installed_plugins.json | Registry of ALL plugins (installed + disabled) | | ~/.claude/settings.json → enabledPlugins | Controls which plugins are ACTIVE | | ~/.claude/plugins/known_marketplaces.json | Registered marketplace sources | | ~/.claude/plugins/cache/ | Actual plugin files |

A plugin is active ONLY when:

1. Exists in installed_plugins.json (registered)
2. Listed in settings.json → enabledPlugins with value true

Issue 3: Marketplace Cache Stale

Symptoms:

• GitHub has latest changes
• Install finds plugin but gets old version
• Newly added plugins not visible

Solution:

# Update marketplace cache
claude plugin marketplace update marketplace-name

# Or clear and re-fetch
rm -rf ~/.claude/plugins/cache/marketplace-name
claude plugin marketplace update marketplace-name

Issue 4: Plugin Not Found in Marketplace

Common causes (in order of likelihood):

1. Local changes not pushed to GitHub - Most common!

   git status
   git push
   claude plugin marketplace update marketplace-name
   

2. marketplace.json configuration error

   python3 -m json.tool .claude-plugin/marketplace.json
   

3. Skill directory missing

   ls -la skill-name/SKILL.md
   

Diagnostic Commands Reference

| Purpose | Command | |---------|---------| | List marketplaces | claude plugin marketplace list | | Update marketplace | claude plugin marketplace update {name} | | Install plugin | claude plugin install {plugin}@{marketplace} | | Enable plugin | claude plugin enable {plugin}@{marketplace} | | Disable plugin | claude plugin disable {plugin}@{marketplace} | | Uninstall plugin | claude plugin uninstall {plugin}@{marketplace} | | Check installed | cat ~/.claude/plugins/installed_plugins.json \| jq '.plugins \| keys' | | Check enabled | cat ~/.claude/settings.json \| jq '.enabledPlugins' |

Batch Enable Missing Plugins

To enable all installed but disabled plugins from a marketplace:

python3 scripts/enable_all_plugins.py marketplace-name

Skills vs Commands Architecture

Claude Code has two types of user-invocable extensions:

1. Skills (in skills/ directory)

   • Auto-activated based on description matching
   • Loaded when user request matches skill description

2. Commands (in commands/ directory)

   • Explicitly invocable via /command-name
   • Appears in Skill tool's available list
   • Requires command file (e.g., commands/seer.md)

If a skill should be explicitly invocable, add a corresponding command file.

References

• See references/known_issues.md for GitHub issue tracking
• See references/architecture.md for detailed plugin architecture