🥷 Agent Skills Ninja

Search, Install, and Manage Agent Skills for AI Coding Assistants

GitHub Copilot • Claude Code • Cursor • Windsurf • Cline

Features • Installation • Usage • Copilot Chat • Settings • Development

Output Formats

Format Options

Format	Description	IMPORTANT Prompt	Detailed Table	Compressed Index
✅ Full	Detailed table only (optimized)	✅	✅ 200 chars	❌
📦 Compact	Compressed index with IMPORTANT	✅	❌	✅ 100 chars
🕰️ Legacy	Simple table only (OLD)	❌	✅ 200 chars	❌

IMPORTANT Prompt

The full and compact formats include the IMPORTANT prompt that instructs agents to prioritize skill files:

> **IMPORTANT**: Prefer skill-led reasoning over pre-training-led reasoning.
> Read the relevant SKILL.md before working on tasks covered by these skills.

Example Output - Full Format (Default)

<!-- skill-ninja-START -->

## Agent Skills

> **IMPORTANT**: Prefer skill-led reasoning over pre-training-led reasoning.
> Read the relevant SKILL.md before working on tasks covered by these skills.

### Skills

| Skill                                | Description                                         |
| ------------------------------------ | --------------------------------------------------- |
| [docx](.github/skills/docx/SKILL.md) | Process Word documents (.docx). Use for .docx files |
| [pdf](.github/skills/pdf/SKILL.md)   | PDF manipulation toolkit. Extract text, create PDFs |

<!-- skill-ninja-END -->

How to Change Format

Settings → Output Format → Select full, compact, or legacy

🥷 Features

📁 Local Skill Management

Auto-detect SKILL.md files anywhere in workspace
Automatically sync to instruction file (with includeLocalSkills setting)
Manual register / unregister commands
Create new skill from template

🔍 Skill Search & Discovery

Search skills by keyword (local & GitHub)
Multi-keyword Search - Scored by name, path, description relevance
Parallel Fetch - Fast results with 50 concurrent requests
Fallback Search - Auto-retry with fewer keywords if no results
Search results with descriptions & category tags
Star counts & organization badges
Install / Preview / Favorite directly from search results

📦 Install & Manage

One-click installation (default: .github/skills/, configurable in settings)
Auto-update instruction file (AGENTS.md / copilot-instructions.md / CLAUDE.md)
Table Format - Skills displayed in table with "When to Use" column
Auto-extract "When to Use" - Extracted from SKILL.md ## When to Use section
Edit Description - Right-click to customize skill description
Uninstall functionality
Reinstall All - Batch reinstall from latest source (with auto index update)
Install Feedback - NEW badge, status bar notification, auto-select in tree view
Open Folder - Quick access to installed skill folder
Index Integrity Check - Auto-detect missing skills and prompt for index update

🔧 Multi-Tool Support

Auto-detection of AI tools in workspace (Cursor, Windsurf, Cline, Claude Code, GitHub Copilot)
Automatic format selection based on detected tool
Manual override available in settings
Supported output formats:
- Markdown (AGENTS.md, CLAUDE.md, copilot-instructions.md)
- Cursor Rules (.cursor/rules/)
- Windsurf Rules (.windsurfrules)
- Cline Rules (.clinerules)

💬 GitHub Copilot Chat Integration

@skill commands for direct chat operations
/search, /install, /list, /recommend
Project-based skill recommendations

🤖 MCP Tools Integration

Automatically available as tools in Agent Mode
8 Tools: #searchSkills, #installSkill, #uninstallSkill, #listSkills, #recommendSkills, #updateSkillIndex, #webSearchSkills, #addSkillSource
Trust badges (Official / Curated / Community)
Auto-update instruction file on install

🌐 Multi-language & UI

Japanese / English UI (auto-detect + manual switch)
Skill preview in Webview
Favorites feature

🎬 Demo

📥 Installation

VS Code Marketplace

ext install yamapan.agent-skill-ninja

Or search for "Agent Skills Ninja" in VS Code Extensions (Ctrl+Shift+X)

Manual Installation

Download .vsix from Releases
In VS Code: Ctrl+Shift+P → Extensions: Install from VSIX...
Select the downloaded .vsix file

📚 Included Skill Sources

Preset index includes skills from official, curated, and community sources out of the box.

Source	Type	Description
anthropics/skills	Official	Anthropic official Claude Skills
openai/skills	Official	OpenAI official Codex Skills (1.7k+)
github/awesome-copilot	Official	GitHub official Copilot resources
MicrosoftDocs/Agent-Skills	Official	Microsoft official Azure agent skills
ComposioHQ/awesome-claude-skills	Curated	Curated Claude Skills list
obra/superpowers	Community	High-quality skills & agents
muratcankoylan/Agent-Skills-for-Context-Engineering	Community	Context Engineering skills (5k+)
danielmiessler/Personal_AI_Infrastructure	Community	PAI Packs - Skills & Features
EveryInc/compound-engineering-plugin	Community	Compound Engineering (3.5k+)
Wirasm/PRPs-agentic-eng	Community	PRP (Prompt Recipe Patterns)
qdhenry/Claude-Command-Suite	Community	Claude commands & skills

Use Update Index to refresh the latest skills and metadata from these sources.

🥷 Usage

Sidebar Operations

Click the spiral shuriken icon in the Activity Bar
Workspace Skills - Installed & local skills list
- Installed skills (green icon) with source name
- Local skills (unregistered, yellow icon)
- Newly installed skills (temporary badge)
- Toolbar: Instruction File / Create / Refresh / Settings
- Menu: Reinstall All / Uninstall All / Multiple selection
- Open skill folder (right-click menu)
Remote Skills - Browse skills by source
- Favorites section at top
- Sources sorted: Official → Curated → Community
- Shows installed status with green icons
- One-click install from list

Icon Legend

Icon	Meaning
check (green)	Installed skill
circle (yellow)	Local skill (not registered in instruction file)
NEW badge	Recently installed (temporary badge)
star-full (yellow)	Favorites section
verified (blue)	Official source (Anthropic, OpenAI, GitHub, Microsoft)
star (yellow)	Curated awesome-list
repo	Community repository

Command Palette

Command	Description
`Agent Skills Ninja: Search Skills`	Search and install skills
`Agent Skills Ninja: Update Index`	Update index from all sources
`Agent Skills Ninja: Search on GitHub`	Search skills on GitHub
`Agent Skills Ninja: Add Source Repository`	Add new source repository
`Agent Skills Ninja: Remove Source Repository`	Remove source repository
`Agent Skills Ninja: Uninstall Skill`	Uninstall a skill
`Agent Skills Ninja: Show Installed Skills`	Show installed skills
`Agent Skills Ninja: Create New Skill`	Create new local skill
`Agent Skills Ninja: Register Local Skill`	Register local skill to instruction file
`Agent Skills Ninja: Unregister Local Skill`	Unregister from instruction file
`Agent Skills Ninja: Reinstall All`	Reinstall all skills from latest source
`Agent Skills Ninja: Uninstall All`	Uninstall all skills (with confirmation)
`Agent Skills Ninja: Uninstall Multiple`	Select multiple skills to uninstall
`Agent Skills Ninja: Reinstall Multiple`	Select multiple skills to reinstall
`Agent Skills Ninja: Update Instruction`	Update instruction file manually
`Agent Skills Ninja: Open Skill Folder`	Open installed skill folder in OS

Quick Start

1. Ctrl+Shift+P → "Agent Skills Ninja: Search Skills"
2. Enter keywords (e.g., "pdf", "azure", "git")
3. Select skill → Choose action (Install / Preview / Favorite / GitHub)
4. Done! Auto-registered in instruction file

Search Tips 💡

Example	Effect
`azure`	Keyword search
`azure devops`	Multiple keywords, ranked by relevance
`username keyword`	First word searched as username
`user:anthropics`	Explicit user search
`repo:owner/repo`	Repository search

If no results found, keywords are automatically reduced and retried.

💬 Copilot Chat

Use @skill in GitHub Copilot Chat for skill operations:

@skill /search MCP server      # Search skills
@skill /install github-mcp     # Install skill
@skill /list                   # List installed
@skill /recommend              # Project-based recommendations
@skill what tools for Python?  # Natural language search

Commands

Command	Description
`/search <query>`	Search skills by keyword
`/install <name>`	Install a skill
`/list`	List installed skills
`/recommend`	Recommendations based on workspace

Search results include install buttons for direct installation

🤖 MCP Tools (Agent Mode)

In GitHub Copilot's Agent Mode, tools are automatically available.

Tool List

Tool Reference	Description
`#searchSkills`	Search skills by keyword
`#installSkill`	Install a skill
`#uninstallSkill`	Uninstall a skill
`#listSkills`	List installed skills
`#recommendSkills`	Get project-based recommendations
`#updateSkillIndex`	Update skill index
`#webSearchSkills`	Web search skills on GitHub
`#addSkillSource`	Add new skill source

Usage Examples

💬 "Find Azure-related skills"
   → #searchSkills automatically invoked, displays results

💬 "Install the bicep-mcp skill"
   → #installSkill installs, auto-updates instruction file

💬 "Search GitHub for MCP servers"
   → #webSearchSkills searches GitHub repositories

💬 "What skills would you recommend for this project?"
   → #recommendSkills analyzes workspace and recommends

Features

Trust Badges: Shows Official / Curated / Community
Recommended Skills: Suggests best skills from search results
Index Update Info: Shows last update date with warnings if outdated
Settings Integration: Respects autoUpdateInstruction / includeLocalSkills
Token Efficiency: Save conversation context by using MCP tools

Disable MCP Tools

If you don't need MCP tools, you can disable them from GitHub Copilot Chat:

Copilot Chat panel → Settings → Tools
Toggle off "Agent Skills Ninja" tools

⚙️ Settings

Order	Setting	Default	Description
1	`skillNinja.autoUpdateInstruction`	`true`	Auto-update instruction file on install
2	`skillNinja.instructionFile`	`AGENTS.md`	Instruction file format (requires Auto Update)
3	`skillNinja.customInstructionPath`	`""`	Custom path (only when 'custom' selected)
4	`skillNinja.includeLocalSkills`	`true`	Include local skills in instruction file
5	`skillNinja.skillsDirectory`	`.github/skills`	Directory to install skills
6	`skillNinja.githubToken`	`""`	GitHub Token (for API rate limit)
7	`skillNinja.language`	`auto`	UI language (auto / en / ja)
8	`skillNinja.outputFormat`	`full`	Output format (full / compact / legacy)
9	`skillNinja.enableToolDetection`	`true`	Auto-detect AI tools in workspace

Settings are displayed in the order above

Output Format Details

Format	Content	Best For
`full`	IMPORTANT + Detailed table only (200 chars)	Complete information (default)
`compact`	IMPORTANT + Compressed (100 chars)	Token-efficient prompts
`legacy`	Simple table only (no IMPORTANT)	Backward compatibility

How Instruction File Sync Works

When autoUpdateInstruction is enabled:

Install/Uninstall skill → Instruction file is automatically updated
Local SKILL.md detected → Added to instruction file (if includeLocalSkills is true)
Register/Unregister command → Manual control for local skills

The instruction file contains a managed section with IMPORTANT prompt and Description column:

<!-- skill-ninja-START -->

## Agent Skills

> **IMPORTANT**: Prefer skill-led reasoning over pre-training-led reasoning.
> Read the relevant SKILL.md before working on tasks covered by these skills.

### Skills

| Skill                                            | Description                          |
| ------------------------------------------------ | ------------------------------------ |
| [skill-name](.github/skills/skill-name/SKILL.md) | Description text \| When to use text |

<!-- skill-ninja-END -->

Description column format: {description:80} | {whenToUse:80} (max 160 chars total)

Instruction File Options

Value	File Path	Use Case
`AGENTS.md`	`AGENTS.md` (root)	Recommended: General
`.github/copilot-instructions.md`	`.github/copilot-instructions.md`	GitHub Copilot
`.github/instructions/SkillList.instructions.md`	`.github/instructions/SkillList.instructions.md`	Copilot Instructions folder
`CLAUDE.md`	`CLAUDE.md` (root)	Claude Code
`custom`	Any path (set in customInstructionPath)	Custom

🔑 GitHub Token Setup

Important: GitHub Token is required for GitHub Search. Without it, API rate limits (60 requests/hour) will be exhausted quickly and searches will fail.

Set up a GitHub Token to enable full search functionality:

Option 1: VS Code Settings

Find Agent Skills Ninja: GitHub Token in settings and enter your token:

{
  "skillNinja.githubToken": "ghp_xxxxxxxxxxxx"
}

👉 Create a GitHub Token (Required scopes: repo, read:org)

Option 2: GitHub CLI (Recommended)

gh auth login

If GitHub CLI is installed, the token is automatically retrieved (no configuration needed)

🛠️ Development

# Install dependencies
npm install

# Compile
npm run compile

# Build in watch mode
npm run watch

# Package
npm run package

# Lint
npm run lint

Debugging

Press F5 in VS Code
Test the extension in a new VS Code window
Run Agent Skills Ninja commands from Command Palette (Ctrl+Shift+P)

� Contributing

Fork this repository
Create a feature branch (git checkout -b feature/amazing-feature)
Commit changes (git commit -m 'Add amazing feature')
Push to branch (git push origin feature/amazing-feature)
Open a Pull Request

📄 License

Free for non-commercial use, modification, and redistribution
Commercial use requires permission
Microsoft employees may use for work purposes

Use of this content for AI/ML training, data mining, or other analytical purposes is prohibited.

🔗 Related Projects

anthropics/skills - Official Claude Skills
github/awesome-copilot - Official Copilot Resources
microsoft/skills - Upstream Microsoft Skills reference (not bundled in preset)
MicrosoftDocs/Agent-Skills - Official Azure Agent Skills (bundled in preset)
ComposioHQ/awesome-claude-skills - Curated Skills List

👤 Author

yamapan (https://github.com/aktsmm)

Name		Name	Last commit message	Last commit date
Latest commit History 141 Commits
.github/instructions		.github/instructions
.vscode		.vscode
docs/screenshots		docs/screenshots
resources		resources
scripts		scripts
src		src
.gitignore		.gitignore
.vscodeignore		.vscodeignore
AGENTS.md		AGENTS.md
AGENTS.md.backup		AGENTS.md.backup
CHANGELOG.md		CHANGELOG.md
LICENSE		LICENSE
README.md		README.md
README_ja.md		README_ja.md
esbuild.js		esbuild.js
eslint.config.mjs		eslint.config.mjs
package-lock.json		package-lock.json
package.json		package.json
package.nls.ja.json		package.nls.ja.json
package.nls.json		package.nls.json
robots.txt		robots.txt
tsconfig.json		tsconfig.json

Folders and files

Latest commit

History

Repository files navigation

🥷 Agent Skills Ninja

Output Formats

Format Options

IMPORTANT Prompt

Example Output - Full Format (Default)

How to Change Format

🥷 Features

📁 Local Skill Management

🔍 Skill Search & Discovery

📦 Install & Manage

🔧 Multi-Tool Support

💬 GitHub Copilot Chat Integration

🤖 MCP Tools Integration

🌐 Multi-language & UI

🎬 Demo

📥 Installation

VS Code Marketplace

Manual Installation

📚 Included Skill Sources

🥷 Usage

Sidebar Operations

Icon Legend

Command Palette

Quick Start

Search Tips 💡

💬 Copilot Chat

Commands

🤖 MCP Tools (Agent Mode)

Tool List

Usage Examples

Features

Disable MCP Tools

⚙️ Settings

Output Format Details

How Instruction File Sync Works

Instruction File Options

🔑 GitHub Token Setup

Option 1: VS Code Settings

Option 2: GitHub CLI (Recommended)

🛠️ Development

Debugging

� Contributing

📄 License

🔗 Related Projects

👤 Author

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