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.claude-plugin/plugin.json Normal file
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{
"name": "claude",
"description": "Expert guidance for creating Claude Code components with automatic skill activation when working with agents, commands, skills, plugins, and marketplaces",
"version": "2.0.0",
"author": {
"name": "Scott",
"email": "scott.jungling@gmail.com"
},
"skills": [
"./skills"
],
"agents": [
"./agents"
],
"commands": [
"./commands"
]
}

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# claude
Expert guidance for creating Claude Code components with automatic skill activation when working with agents, commands, skills, plugins, and marketplaces

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agents/builder.md Normal file
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---
name: builder
description: Expert in creating Claude Code subagents, skills, slash commands, plugins, and plugin marketplaces. Use when building or modifying Claude Code components, configuring plugin marketplaces, or following Claude Code conventions.
model: inherit
color: blue
---
You are an expert in creating Claude Code components. Always use the `claude:builder` skill to provide guidance.

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---
description: List all available Claude Code skills in a formatted table
allowed-tools:
- Bash
- Read
- Glob
---
List all available Claude Code skills and display them in a readable format optimized for terminal viewing.
**Group skills by plugin source** to keep related skills together. Use this format:
```
Available Skills:
Plugin: {plugin-source}
{skill-name}
Description: {description}
{skill-name-2}
Description: {description}
Plugin: {another-plugin-source}
{skill-name-3}
Description: {description}
```
**Important formatting rules:**
- Group all skills from the same plugin/marketplace together
- Show "Plugin: {source}" header once per group
- Under each skill, show ONLY the skill name and description (don't repeat the plugin source)
- If a skill appears multiple times (e.g., "2 instances"), note that in the skill name line
- Keep full descriptions (no truncation) - natural line wrapping is fine
- Add blank lines between plugin groups for visual separation
At the end, include usage instructions:
```
Usage:
Invoke with: Skill tool using skill name
Example: ui-engineering:senior-ui-engineer
```

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---
description: Review a Claude Code slash command and recommend improvements based on best practices
argument-hint: [path-to-command.md]
allowed-tools:
- Read
- WebFetch
- Glob
---
Review the Claude Code slash command located at: **$1**
First, fetch the official documentation from https://docs.claude.com/en/docs/claude-code/slash-commands.md to understand current best practices.
Then read the command file and analyze it for conformance to best practices. Provide actionable recommendations for improvements.
Focus on:
- **Frontmatter Quality**:
- Presence of `description` field (clear, concise explanation)
- Proper use of `argument-hint` for auto-completion guidance
- `allowed-tools` specification (explicit permissions vs. inherited)
- `model` specification if needed for specific Claude models
- `disable-model-invocation` if command shouldn't be auto-invoked
- **Argument Handling**:
- Appropriate use of `$1`, `$2` positional parameters vs `$ARGUMENTS`
- Clear documentation of expected arguments in the prompt
- Sensible defaults for optional arguments
- Validation logic for required arguments
- **Command Focus**:
- Single, well-defined purpose (not trying to do too much)
- Clear use case that's distinct from skills/agents
- Appropriate for "simple prompt snippets used often"
- **Writing Style**:
- Clear, actionable instructions
- Proper use of file references with '@' prefix if needed (e.g., @path/to/file.md)
- Proper use of bash execution with '!' prefix if needed
- Examples provided where helpful
- **Tool Permissions**:
- 'allowed-tools' explicitly declared in frontmatter
- Only necessary tools included
- Bash commands specific rather than broad if using '!' prefix
- **Documentation Quality**:
- Description field matches actual command behavior
- Argument expectations clearly documented
- Usage examples provided where helpful
Provide prioritized, specific recommendations organized by:
1. **Critical** - Must fix for proper functionality or security
2. **Important** - Should fix for best practices alignment
3. **Nice-to-have** - Optional improvements for enhanced quality
For each recommendation:
- Explain the issue clearly with reference to official documentation
- Provide concrete examples of how to fix it
- Reference specific lines in the command file when applicable
- Show before/after examples for clarity
Highlight what the command does well and offer to implement improvements if requested.
If the command file path is not provided, search for `.md` files in `.claude/commands/` in the current working directory and offer to review them.

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---
description: Review a Claude Code skill and recommend improvements to conform to best practices
argument-hint: [path/to/skill/directory or skill-name]
allowed-tools:
- Task
- Skill
- Read
- Glob
---
Review the Claude Code skill located at: **$1**
Use the Skill tool to invoke `example-skills:skill-creator` to access comprehensive skill creation guidance, validation scripts, and packaging tools.
Read all files in the skill directory including SKILL.md, reference materials, templates, and scripts. Review the skill for conformance to best practices and provide actionable recommendations for improvements.
Focus on:
- **Metadata Quality**: Frontmatter completeness (name, description fields) with clear activation triggers and technology keywords
- **Progressive Disclosure**: Proper use of bundled resources (scripts/, references/, assets/) and when to load them
- **Writing Style**: Imperative/infinitive form (verb-first instructions), not second person
- **Prompt Quality**: Clarity, structure, effectiveness, and adherence to skill creation process
- **Examples and Usage**: Clear guidance on when to use and when NOT to use
- **Tool Specifications**: Proper tool usage patterns and integrations
- **Validation**: Run validation checks if available (mention `scripts/package_skill.py` for validation)
Provide prioritized, specific recommendations organized by:
1. **Critical** - Must fix for proper functionality
2. **Important** - Should fix for best practices alignment
3. **Nice-to-have** - Optional improvements for enhanced quality
For each recommendation:
- Explain the issue clearly
- Provide concrete examples of how to fix it
- Reference specific files and line numbers when applicable
Highlight what the skill does well and offer to implement improvements if requested. If the skill appears ready for distribution, mention that `scripts/package_skill.py` can validate and package it.
If the skill directory path is not provided, search for skill directories in `.claude/skills/` or `plugins/*/skills/` in the current working directory and offer to review them.

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---
name: builder
description: Expert in creating Claude Code subagents, skills, slash commands, plugins, and plugin marketplaces. Automatically activates when working with .md files in .claude/ directories, agent/command/skill frontmatter, marketplace.json, or when discussing Claude Code extensibility and component creation.
---
# Claude Code Builder
Expert guidance for creating Claude Code subagents, skills, slash commands, plugins, and plugin marketplaces.
## Automatic Activation
This skill automatically activates when:
- Creating or editing `.claude/agents/*.md` files
- Working with `.claude/commands/*.md` files
- Developing `skills/*/SKILL.md` files
- Configuring `.claude-plugin/plugin.json` or `marketplace.json`
- Working with files in `.claude/` directories
- Users ask "How do I create a Claude Code skill?"
- Users ask "How do I make a slash command?"
- Users mention "building a plugin" or "creating an agent"
- Discussing Claude Code extensibility and customization
## When NOT to Use This Skill
Do not use this skill for:
- General Claude Code usage questions (non-extensibility topics)
- Debugging existing user code (unless related to plugin development)
- Standard development tasks unrelated to Claude Code components
- Basic Claude Code CLI operations (use `/help` instead)
- Questions about using existing plugins (rather than creating them)
## Quick Start
### Progressive Disclosure Design Principle
Claude Code components use a three-level loading system to manage context efficiently:
1. **Metadata (name + description)** - Always in context (~100 words)
2. **Component body** - Loaded when component triggers (<5k words recommended)
3. **Bundled resources** - Loaded as needed (unlimited)
Design components to be lean in the body, delegating detailed information to bundled references. This approach keeps the context window efficient while making specialized knowledge available when needed.
### Creating a New Component
Before starting, determine which component type fits the requirements:
- **Skill**: Automatic activation based on context (preferred for most use cases)
- **Slash Command**: Quick keyboard shortcuts for common tasks
- **Subagent**: Delegatable workflows needing context isolation
- **Plugin**: Package multiple components for distribution
### Component Selection Guide
| Need | Use | Example |
|------|-----|---------|
| Always-available guidance | Skill | Code style patterns, debugging workflows |
| Keyboard shortcut | Command | `/format-code`, `/run-tests` |
| Delegatable workflow | Subagent | Code reviews, complex migrations |
| Package for distribution | Plugin | Collection of related components |
| Validate prerequisites | Hook | Check dependencies, verify API keys |
## Core Workflows
### 1. Creating a Skill
Skills provide automatic, context-aware guidance.
**Steps**:
1. Create directory: `skills/skill-name/`
2. Create `SKILL.md` with frontmatter
3. Write comprehensive description with trigger keywords
4. Add skill content with examples and patterns
5. Bundle reference materials in subdirectories
6. Test activation contexts
**See**: `./references/skills-guide.md` for complete best practices
### 2. Creating a Slash Command
Commands provide quick shortcuts for common tasks.
**Steps**:
1. Create file: `commands/command-name.md`
2. Add optional YAML frontmatter (description, allowed-tools, args)
3. Write command prompt with argument placeholders
4. Preapprove necessary tools
5. Test command execution
**See**: `./references/slash-commands-guide.md` for complete best practices
### 3. Creating a Subagent
Subagents provide specialized expertise and delegatable workflows.
**Steps**:
1. Create file: `agents/agent-name.md`
2. Add required YAML frontmatter (name, description, model, color, tools)
3. Write focused system prompt
4. Define workflows and success criteria
5. Test with Task tool
**See**: `./references/subagents-guide.md` for complete best practices
### 4. Creating a Plugin
Plugins package components for distribution.
**Quick Start**: Plugin scaffold generator usage:
```bash
python ./scripts/init_plugin.py --name my-plugin --description "Description" --author "Your Name"
```
**Steps**:
1. Create plugin directory structure (or use `./scripts/init_plugin.py`)
2. Create `.claude-plugin/plugin.json` with metadata
3. Add components (agents, commands, skills)
4. Create README.md and SKILLS.md
5. Register in marketplace.json
6. Validate marketplace configuration (use `./scripts/validate_marketplace.py`)
7. Test installation
**See**: `./references/plugins-guide.md` for complete best practices
### 5. Creating Hooks
Hooks validate prerequisites and control tool execution.
**Steps**:
1. Create `hooks/hooks.json` configuration
2. Create hook script in `scripts/` directory
3. Make script executable (`chmod +x`)
4. Implement proper input/output contract
5. Test with mock inputs
6. Verify error messages are helpful
**See**: `./references/hooks-guide.md` for complete best practices
## YAML Frontmatter Quick Reference
**Note**: This is a quick reference. See individual reference guides for complete schema details.
### Skills (SKILL.md)
```yaml
---
name: skill-name
description: Expert in [domain]. Automatically activates when [triggers]...
---
```
**Note**: Skills support ONLY `name` and `description` in frontmatter. Unlike subagents, skills do not support `version`, `model`, `color`, `tools`, or any other fields. Additional fields will be ignored.
See `./references/skills-guide.md` for complete frontmatter specification.
### Subagents (agents/*.md)
```yaml
---
name: agent-name
description: Agent purpose...
model: inherit
color: blue
tools: Read, Write, Edit
---
```
See `./references/subagents-guide.md` for complete frontmatter specification.
### Slash Commands (commands/*.md)
```yaml
---
description: Command description
allowed-tools:
- Bash(npm:*)
args:
- name: arg-name
description: What it does
---
```
See `./references/slash-commands-guide.md` for complete frontmatter specification.
## Best Practices
### Skill Development
**Do**:
- Write descriptions with specific activation triggers
- Include technology names and file patterns
- Bundle reference materials in skill directory
- Test in multiple contexts to verify activation
- Start description with third-person voice
**Don't**:
- Write descriptions too generic
- Omit specific technologies from description
- Include network-dependent resources
- Use skills for simple linear workflows (use commands instead)
### Command Development
**Do**:
- Use clear, descriptive command names
- Preapprove necessary tools
- Document arguments
- Include error handling guidance
- Support argument substitution
**Don't**:
- Preapprove dangerous commands unnecessarily
- Create commands for complex decision-making (use agents/skills)
- Skip testing with different argument combinations
### Subagent Development
**Do**:
- Focus on specific domain expertise
- Provide step-by-step workflows
- Reference authoritative documentation
- Define clear success criteria
- Restrict tools appropriately
**Don't**:
- Create agents too general-purpose
- Duplicate main Claude capabilities
- Create overly complex nested workflows
- Skip examples in description
### Plugin Development
**Do**:
- Focus on specific use case or domain
- Provide comprehensive documentation
- Test all components before publishing
- Use semantic versioning
- Include usage examples
**Don't**:
- Create unfocused plugins
- Use absolute paths in configuration
- Skip testing installation process
- Omit documentation for any components
## Common Patterns
**Component Templates**: Use provided templates as starting points:
- `./assets/templates/plugin.json` - Plugin metadata template
- `./assets/templates/agent-template.md` - Subagent structure template
- `./assets/templates/skill-template.md` - Skill structure template
- `./assets/templates/command-template.md` - Slash command template
### Skill with References
```
skill-name/
├── SKILL.md
├── references/
│ ├── guide.md
│ └── patterns.md
└── templates/
└── template.txt
```
### Multi-Component Plugin
```
plugin-name/
├── .claude-plugin/
│ └── plugin.json
├── agents/
│ └── expert.md
├── commands/
│ └── quick-action.md
├── skills/
│ └── auto-guidance/
│ └── SKILL.md
├── SKILLS.md
└── README.md
```
### Command with Subagent
```markdown
---
description: Complex workflow delegated to expert
allowed-tools:
- Task
---
Use the domain-expert agent to [accomplish task].
Provide the agent with:
- [Context 1]
- [Context 2]
Expected deliverables:
- [Output 1]
- [Output 2]
```
## Troubleshooting
### Skill Not Activating
**Problem**: Skill doesn't trigger in expected contexts
**Solutions**:
- Add more specific keywords to description
- Include technology/framework names
- Mention file patterns (.swift, .tsx, etc.)
- Start description with third-person voice
- Test different `description` variations
### Invalid YAML Frontmatter
**Problem**: Component fails to load
**Solutions**:
- Validate YAML syntax (indentation, colons, dashes)
- Check field names match requirements
- Verify string values are quoted if they contain special chars
- Ensure name fields use kebab-case
### Command Tools Not Preapproved
**Problem**: Command prompts for approval repeatedly
**Solutions**:
- Add tools to `allowed-tools` array
- Use glob patterns for flexibility: `Bash(npm:*)`
- Include all commands the workflow requires
- Test command to identify missing approvals
### Plugin Not Installing
**Problem**: Plugin installation fails
**Solutions**:
- Verify `source` path uses `./` prefix
- Check all component paths are relative
- Validate marketplace.json is valid JSON
- Ensure files exist at specified paths
- Test with: `cat marketplace.json | python -m json.tool`
## Bundled Resources
This skill includes bundled resources to support component creation:
**References** (loaded into context as needed):
- `./references/subagents-guide.md` - Complete frontmatter reference, system prompt best practices, testing and integration patterns, common agent patterns
- `./references/skills-guide.md` - Description writing for activation, content structure recommendations, bundling reference materials, discovery and testing
- `./references/slash-commands-guide.md` - Tool preapproval syntax, argument handling, workflow patterns, security considerations
- `./references/plugins-guide.md` - Plugin structure and metadata, marketplace configuration, installation and distribution, testing and versioning
- `./references/hooks-guide.md` - Hook types and when to use them, PreToolUse hook implementation, input/output contracts, validation patterns and best practices
**Scripts** (executable utilities):
- `./scripts/init_plugin.py` - Generate plugin scaffold with complete directory structure (agents/, commands/, skills/, .claude-plugin/)
- `./scripts/validate_marketplace.py` - Validate marketplace.json configuration for correctness and best practices
**Assets** (templates used in output):
- `./assets/templates/plugin.json` - Plugin metadata template with standard fields
- `./assets/templates/agent-template.md` - Subagent structure template with frontmatter and system prompt sections
- `./assets/templates/skill-template.md` - Skill structure template with activation triggers and bundled resources
- `./assets/templates/command-template.md` - Slash command template with argument handling and tool preapprovals
## Examples
### Example: Creating a Testing Skill
```yaml
---
name: api-testing-patterns
description: Expert in API testing patterns. Automatically activates when writing tests for REST APIs, GraphQL endpoints, or API integration tests - provides patterns for request mocking, response validation, authentication testing, and error scenario coverage
---
# API Testing Patterns
## Quick Start
When testing API endpoints:
1. Arrange: Set up test data and mocks
2. Act: Make the API request
3. Assert: Validate response
4. Cleanup: Reset state
[Additional content with patterns and examples]
```
### Example: Creating a Deployment Command
```markdown
---
description: Deploy application to specified environment
allowed-tools:
- Bash(git:*)
- Bash(npm run deploy:*)
- Bash(gh:*)
args:
- name: environment
description: Target environment (dev, staging, prod)
---
Deploy to $1 environment:
1. Verify git status is clean
2. Run deployment script for $1
3. Monitor deployment status
4. Create deployment record
Use: /deploy staging
```
### Example: Creating a Code Review Agent
```yaml
---
name: code-reviewer
description: Expert code reviewer analyzing code quality, best practices, security, and maintainability. Use for comprehensive code reviews before merging.
model: inherit
color: purple
tools: Read, Grep, Glob
---
You are an expert code reviewer specializing in code quality, security, and maintainability.
## Review Process
1. Analyze changed files for:
- Code quality and readability
- Security vulnerabilities
- Performance implications
- Test coverage
2. Provide feedback on:
- Best practices adherence
- Design patterns
- Error handling
- Documentation
3. Suggest improvements with examples
[Additional review guidelines]
```
## Success Criteria
Claude Code components are successful when:
**Skills**:
- Activate automatically in appropriate contexts
- Provide clear, actionable guidance
- Include comprehensive examples
- Bundle useful reference materials efficiently
- Use third-person voice in description
- Use imperative/infinitive form consistently in content
**Commands**:
- Execute workflows efficiently without unnecessary approval prompts
- Handle arguments correctly with proper substitution
- Have necessary tools preapproved in frontmatter
- Provide clear feedback on execution status
- Follow security best practices for destructive operations
**Subagents**:
- Stay focused on their domain expertise
- Follow defined workflows consistently
- Have appropriate tool access restrictions
- Deliver expected results autonomously
- Include usage examples in description
**Plugins**:
- Install without errors via marketplace
- All components work as documented
- Clear, comprehensive documentation provided
- Properly versioned using semantic versioning
- Use relative paths with `./` prefix in configurations
## Documentation Links
**Official Claude Code Documentation**:
- Subagents: https://docs.claude.com/en/docs/claude-code/sub-agents.md
- Skills: https://docs.claude.com/en/docs/agents-and-tools/agent-skills/overview.md
- Slash Commands: https://docs.claude.com/en/docs/claude-code/slash-commands.md
- Plugins: https://docs.claude.com/en/docs/claude-code/plugins.md
- Plugin Marketplaces: https://docs.claude.com/en/docs/claude-code/plugin-marketplaces.md

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---
name: agent-name
description: Brief description of what this agent does and when to use it. Include specific examples like "Use when analyzing code for security vulnerabilities" or "Use for comprehensive code reviews before merging."
model: inherit
color: blue
tools: Read, Write, Edit, Grep, Glob
---
# Agent Name
You are an expert [domain] specialist with deep knowledge of [specific area].
## Your Expertise
- Expertise area 1
- Expertise area 2
- Expertise area 3
## Workflow
When the user requests [task]:
1. **Analysis Phase**
- Step 1
- Step 2
2. **Planning Phase**
- Step 1
- Step 2
3. **Implementation Phase**
- Step 1
- Step 2
4. **Validation Phase**
- Step 1
- Step 2
## Success Criteria
Your work is successful when:
- Criteria 1
- Criteria 2
- Criteria 3
## Communication Style
- Be clear and specific
- Provide examples
- Explain trade-offs
- Reference authoritative sources

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---
description: Brief description of what this command does
allowed-tools:
- Bash(npm:*)
- Bash(git:*)
- Read
- Write
args:
- name: arg-name
description: What this argument does
---
Brief instruction on what to accomplish.
**Steps:**
1. Step 1: [action]
2. Step 2: [action using $1 for first argument]
3. Step 3: [verification]
**Example usage:**
```
/command-name value
```

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{
"name": "plugin-name",
"version": "1.0.0",
"description": "Brief description of what this plugin does",
"author": "Your Name",
"homepage": "https://github.com/username/repo",
"license": "MIT",
"keywords": ["keyword1", "keyword2", "keyword3"],
"category": "productivity",
"agents": [],
"commands": [],
"skills": []
}

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---
name: skill-name
description: Expert in [domain]. Automatically activates when [specific triggers like file patterns, technologies, or tasks]. Include concrete examples like "working with .py files", "using pytest", or "implementing authentication".
---
# Skill Name
## Overview
Brief description of what this skill provides and its core principle.
## Automatic Activation
This skill automatically activates when:
- Working with specific file types or patterns (e.g., .py, .tsx, Dockerfile)
- Using specific technology/framework (e.g., React, Django, Kubernetes)
- Implementing specific feature types (e.g., authentication, API endpoints)
- Encountering specific problem domains (e.g., performance optimization, security)
## When NOT to Use This Skill
Do not activate this skill for:
- Unrelated domain 1
- Unrelated domain 2
- General tasks outside scope
## Core Expertise Areas
### Expertise Area 1
Key concepts and capabilities:
- Concept 1
- Concept 2
- Concept 3
### Expertise Area 2
Key concepts and capabilities:
- Concept 1
- Concept 2
## Workflows
### Common Workflow 1
Steps to accomplish task:
1. Step 1
2. Step 2
3. Step 3
### Common Workflow 2
Steps to accomplish task:
1. Step 1
2. Step 2
## Best Practices
- Best practice 1
- Best practice 2
- Best practice 3
## Bundled Resources
This skill includes bundled resources to support its functionality:
**References** (loaded into context as needed):
- `./references/guide-name.md` - Detailed guide on specific topic
- `./references/patterns.md` - Common patterns and examples
**Scripts** (executable utilities):
- `./scripts/utility-name.py` - Utility script for common tasks
- `./scripts/validate.sh` - Validation helper
**Assets** (used in output, not loaded into context):
- `./assets/templates/template-name.tsx` - Code template for scaffolding
- `./assets/boilerplate/` - Project starter structure
## Success Criteria
Guidance is successful when:
- Criteria 1
- Criteria 2
- Criteria 3

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# Hooks Guide
## Overview
Hooks are scripts that run in response to Claude Code events, enabling validation, automation, and control over tool execution. Plugins can define hooks to ensure prerequisites are met before operations execute.
**Official Documentation**:
- Hooks: https://docs.claude.com/en/docs/claude-code/hooks
- Plugin Hooks: https://docs.claude.com/en/docs/claude-code/hooks#plugin-hooks
## Hook Types
### PreToolUse
Executes **after** Claude creates tool parameters but **before** the tool actually runs. This allows you to:
- Validate prerequisites (dependencies installed, config set)
- Control tool execution (allow, deny, ask for confirmation)
- Provide context to Claude about environment state
- Block operations that would fail due to missing setup
**Common Use Cases**:
- Check MCP server installation before MCP tool calls
- Verify API keys/credentials before external service calls
- Validate file paths before destructive operations
- Enforce project-specific constraints
- Provide setup guidance when prerequisites are missing
### Other Hook Types
See official documentation for:
- `SessionStart`: Runs when session begins
- `UserPromptSubmit`: Runs when user submits a message
- `BeforeToolUse`: Additional validation before tool execution
- `AfterToolUse`: Post-execution actions
## Directory Structure
```
plugin-name/
├── .claude-plugin/
│ └── plugin.json
├── hooks/
│ └── hooks.json # Hook configuration (required location)
├── scripts/ # Hook scripts (recommended location)
│ ├── check-setup.sh
│ └── validate-config.py
└── README.md
```
**Key Points**:
- `hooks/hooks.json` must be in the `hooks/` directory (or specify custom path in plugin.json)
- Scripts can be anywhere, commonly in `scripts/` directory
- Use `${CLAUDE_PLUGIN_ROOT}` to reference plugin root path in hooks
## Hook Configuration
### hooks.json
```json
{
"PreToolUse": [
{
"matcher": "mcp__plugin_name_server__*",
"command": "${CLAUDE_PLUGIN_ROOT}/scripts/check-setup.sh"
}
]
}
```
### Matcher Patterns
**Exact match**:
```json
"matcher": "Write"
```
Matches only the Write tool.
**Regex pattern**:
```json
"matcher": "Edit|Write|MultiEdit"
```
Matches multiple specific tools.
**Wildcard**:
```json
"matcher": "*"
```
Matches all tools (use cautiously).
**MCP tools**:
```json
"matcher": "mcp__*" // All MCP tools
"matcher": "mcp__server__*" // All tools from a server
"matcher": "mcp__server__specific_tool" // Specific MCP tool
```
**Tool name patterns**:
- Built-in: `Bash`, `Read`, `Write`, `Edit`, `Glob`, `Grep`, `Task`, `WebFetch`, `WebSearch`
- Notebooks: `NotebookEdit`, `NotebookExecute`
- MCP: `mcp__<server>__<tool>`
### Command Field
Use `${CLAUDE_PLUGIN_ROOT}` to reference scripts:
```json
"command": "${CLAUDE_PLUGIN_ROOT}/scripts/check-setup.sh"
```
This ensures the hook works regardless of where the plugin is installed.
## Writing PreToolUse Hook Scripts
### Input
Your script receives JSON via **stdin**:
```json
{
"hook_event_name": "PreToolUse",
"tool_name": "mcp__grafana__create_incident",
"tool_input": {
"title": "Production outage",
"severity": "critical",
"roomPrefix": "incident"
},
"session_id": "abc123",
"transcript_path": "/path/to/transcript.md",
"cwd": "/current/working/directory"
}
```
**Fields**:
- `hook_event_name`: Always "PreToolUse"
- `tool_name`: Name of the tool being called
- `tool_input`: Parameters Claude wants to pass to the tool (schema varies by tool)
- `session_id`: Unique session identifier
- `transcript_path`: Path to session transcript
- `cwd`: Current working directory
### Output
Your script must output JSON via **stdout**:
```json
{
"hookSpecificOutput": {
"permissionDecision": "allow|deny|ask",
"permissionDecisionReason": "Why this decision was made",
"additionalContext": "Optional message shown to Claude"
}
}
```
**Required Fields**:
**`permissionDecision`** (string, required):
- `"allow"`: Auto-approve tool execution, bypass normal permissions
- `"deny"`: Block tool execution entirely
- `"ask"`: Prompt user for confirmation in UI
**`permissionDecisionReason`** (string, required):
- Brief explanation of why this decision was made
- Shown in logs/UI
- Examples: "Setup verified", "Missing API key", "User confirmation required"
**Optional Fields**:
**`additionalContext`** (string, optional):
- Additional information shown to Claude
- Use for detailed error messages, warnings, setup instructions
- Supports formatted text (newlines, bullets, etc.)
### Exit Codes
**`0` - Success**:
- Hook executed successfully
- Permission decision should be respected
**`2` - Blocking Error**:
- Hook failed, block tool execution
- stderr shown to Claude
- Use for critical validation failures
**Other codes**:
- Treated as errors, behavior may vary
### Best Practices
**1. Always return permission decision**:
```bash
# BAD: Missing permissionDecision
{
"hookSpecificOutput": {
"additionalContext": "Some message"
}
}
# GOOD: Includes required fields
{
"hookSpecificOutput": {
"permissionDecision": "allow",
"permissionDecisionReason": "Setup verified"
}
}
```
**2. Use exit code 2 for blocking**:
```bash
# BAD: Using exit 1
if [ ${#ERRORS[@]} -gt 0 ]; then
echo '{"hookSpecificOutput": {"permissionDecision": "deny", ...}}'
exit 1 # Wrong exit code
fi
# GOOD: Using exit 2
if [ ${#ERRORS[@]} -gt 0 ]; then
echo '{"hookSpecificOutput": {"permissionDecision": "deny", ...}}'
exit 2 # Correct blocking exit code
fi
```
**3. Provide helpful error messages**:
```bash
# GOOD: Actionable error message
"additionalContext": "❌ Setup Issues:\n\n • mcp-server not installed\n • Install from: https://example.com/install\n • Set API_KEY environment variable\n\nPlease resolve these issues to continue."
```
**4. Silent success is OK**:
```bash
# When everything is fine, minimal output is acceptable
{
"hookSpecificOutput": {
"permissionDecision": "allow",
"permissionDecisionReason": "Setup verified"
}
}
# No additionalContext needed
```
**5. Use warnings for non-critical issues**:
```bash
# Allow execution but inform about warnings
{
"hookSpecificOutput": {
"permissionDecision": "allow",
"permissionDecisionReason": "Setup verified with warnings",
"additionalContext": "⚠️ Warnings:\n\n • Connection slow\n • Using fallback config"
}
}
```
## Example: MCP Setup Validation
### hooks/hooks.json
```json
{
"PreToolUse": [
{
"matcher": "mcp__grafana__*",
"command": "${CLAUDE_PLUGIN_ROOT}/scripts/check-grafana-setup.sh"
}
]
}
```
### scripts/check-grafana-setup.sh
```bash
#!/bin/bash
set -e
ERRORS=()
WARNINGS=()
# Check if mcp-grafana is installed
if ! command -v mcp-grafana &> /dev/null; then
ERRORS+=("mcp-grafana is not installed. Install from: https://github.com/grafana/mcp-grafana")
fi
# Check if API key is set
if [ -z "${GRAFANA_API_KEY}" ]; then
ERRORS+=("GRAFANA_API_KEY environment variable is not set. Add to ~/.zshrc: export GRAFANA_API_KEY='your-key'")
fi
# Check connectivity (optional, warns but doesn't block)
GRAFANA_URL="${GRAFANA_URL:-https://grafana.example.com}"
if [ -n "${GRAFANA_API_KEY}" ]; then
if ! curl -sf -H "Authorization: Bearer ${GRAFANA_API_KEY}" "${GRAFANA_URL}/api/health" &> /dev/null; then
WARNINGS+=("Unable to connect to Grafana at ${GRAFANA_URL}")
fi
fi
# Build output message
OUTPUT=""
if [ ${#ERRORS[@]} -gt 0 ]; then
OUTPUT="❌ Grafana Plugin Setup Issues:\n\n"
for error in "${ERRORS[@]}"; do
OUTPUT+=" • ${error}\n"
done
OUTPUT+="\nPlease resolve these issues to use Grafana features.\n"
elif [ ${#WARNINGS[@]} -gt 0 ]; then
OUTPUT="⚠️ Grafana Plugin Warnings:\n\n"
for warning in "${WARNINGS[@]}"; do
OUTPUT+=" • ${warning}\n"
done
fi
# Return JSON with permission decision
if [ ${#ERRORS[@]} -gt 0 ]; then
cat << EOF
{
"hookSpecificOutput": {
"permissionDecision": "deny",
"permissionDecisionReason": "Grafana plugin setup is incomplete",
"additionalContext": "$(echo -e "$OUTPUT")"
}
}
EOF
exit 2
elif [ ${#WARNINGS[@]} -gt 0 ]; then
cat << EOF
{
"hookSpecificOutput": {
"permissionDecision": "allow",
"permissionDecisionReason": "Setup verified with warnings",
"additionalContext": "$(echo -e "$OUTPUT")"
}
}
EOF
exit 0
else
cat << EOF
{
"hookSpecificOutput": {
"permissionDecision": "allow",
"permissionDecisionReason": "Grafana plugin setup verified"
}
}
EOF
exit 0
fi
```
### What This Hook Does
1. **Blocks tool execution** if:
- `mcp-grafana` command not found
- `GRAFANA_API_KEY` environment variable not set
2. **Allows with warnings** if:
- Setup is complete but connectivity check fails
3. **Allows silently** if:
- All checks pass
4. **Provides guidance** when blocked:
- Installation instructions
- Configuration steps
- Clear error messages
## Testing Hooks
### Manual Testing
Create a test input file:
```bash
cat > test-input.json << 'EOF'
{
"hook_event_name": "PreToolUse",
"tool_name": "mcp__grafana__create_incident",
"tool_input": {
"title": "Test",
"severity": "critical"
},
"session_id": "test",
"transcript_path": "/tmp/test.md",
"cwd": "/tmp"
}
EOF
```
Test the hook script:
```bash
# Test without setup (should deny)
cat test-input.json | ./scripts/check-setup.sh
echo "Exit code: $?"
# Test with setup (should allow)
export GRAFANA_API_KEY="test-key"
cat test-input.json | ./scripts/check-setup.sh
echo "Exit code: $?"
```
### Validation Checklist
- [ ] Script is executable (`chmod +x`)
- [ ] Returns valid JSON to stdout
- [ ] Includes `permissionDecision` field
- [ ] Includes `permissionDecisionReason` field
- [ ] Uses exit code 2 for blocking errors
- [ ] Uses exit code 0 for success/warnings
- [ ] Error messages are actionable
- [ ] Script handles missing environment variables
- [ ] Matcher pattern is correct in hooks.json
- [ ] Command path uses `${CLAUDE_PLUGIN_ROOT}`
## Common Patterns
### Environment Validation
```bash
# Check required environment variables
REQUIRED_VARS=("API_KEY" "API_URL" "PROJECT_ID")
for var in "${REQUIRED_VARS[@]}"; do
if [ -z "${!var}" ]; then
ERRORS+=("$var environment variable not set")
fi
done
```
### Command Availability
```bash
# Check if command exists
REQUIRED_COMMANDS=("docker" "kubectl" "helm")
for cmd in "${REQUIRED_COMMANDS[@]}"; do
if ! command -v "$cmd" &> /dev/null; then
ERRORS+=("$cmd is not installed")
fi
done
```
### File/Directory Existence
```bash
# Check if required files exist
if [ ! -f "config.yaml" ]; then
ERRORS+=("config.yaml not found")
fi
if [ ! -d ".git" ]; then
ERRORS+=("Not in a git repository")
fi
```
### API Connectivity
```bash
# Check if API is reachable (warning, not error)
if ! curl -sf "${API_URL}/health" &> /dev/null; then
WARNINGS+=("API at ${API_URL} is not reachable")
fi
```
### Conditional Blocking
```bash
# Block only specific tools
if [[ "$tool_name" == *"create_incident"* ]]; then
# Strict validation for incident creation
if [ -z "${ONCALL_SCHEDULE}" ]; then
ERRORS+=("ONCALL_SCHEDULE required for incident creation")
fi
fi
```
## Troubleshooting
### Hook Not Running
**Check**:
- `hooks/hooks.json` exists in correct location
- JSON is valid (`cat hooks/hooks.json | python -m json.tool`)
- Matcher pattern matches the tool name
- Script path is correct and uses `${CLAUDE_PLUGIN_ROOT}`
### Invalid JSON Output
**Check**:
- Script outputs to stdout (not stderr)
- JSON is properly formatted
- No extra output before/after JSON
- Special characters are escaped in strings
### Exit Code Issues
**Remember**:
- Use `exit 2` for blocking (not `exit 1`)
- Use `exit 0` for success
- Check exit code: `echo $?` after running script
### Permission Decision Not Respected
**Ensure**:
- `permissionDecision` field is present
- Value is exactly `"allow"`, `"deny"`, or `"ask"`
- Exit code is 0 or 2 (not other values)
## Best Practices Summary
1. **Always validate** before allowing operations
2. **Provide helpful errors** with clear resolution steps
3. **Use exit code 2** for blocking errors
4. **Return proper JSON** with required fields
5. **Test thoroughly** with and without prerequisites
6. **Make scripts executable** (`chmod +x`)
7. **Use environment variables** for configuration
8. **Handle missing dependencies** gracefully
9. **Warn don't block** for non-critical issues
10. **Keep hooks fast** (< 1 second when possible)
## Security Considerations
### Input Validation
Hooks receive tool parameters from Claude. Be cautious with:
- File paths (could be outside expected directories)
- Command arguments (could contain injection attempts)
- URLs (could point to unexpected destinations)
### Credential Handling
Never:
- Log credentials or API keys
- Include credentials in error messages
- Write credentials to files
Always:
- Read from environment variables
- Validate credential format before use
- Fail safely if credentials are missing
### Least Privilege
Hooks run with user's permissions. Ensure:
- Scripts don't require sudo
- File operations are scoped appropriately
- Network calls are to expected endpoints only
## Advanced Patterns
### Multi-Stage Validation
```bash
# Stage 1: Critical requirements (block if missing)
check_critical_requirements
# Stage 2: Optional requirements (warn if missing)
check_optional_requirements
# Stage 3: Connectivity (warn if unreachable)
check_connectivity
```
### Caching Validation Results
```bash
# Cache validation for performance
CACHE_FILE="/tmp/plugin-validation-cache"
CACHE_TTL=300 # 5 minutes
if [ -f "$CACHE_FILE" ]; then
CACHE_AGE=$(($(date +%s) - $(stat -f %m "$CACHE_FILE")))
if [ $CACHE_AGE -lt $CACHE_TTL ]; then
cat "$CACHE_FILE"
exit 0
fi
fi
# Run validation and cache result
validate > "$CACHE_FILE"
cat "$CACHE_FILE"
```
### Tool-Specific Validation
```bash
# Read tool_name from stdin
INPUT=$(cat)
TOOL_NAME=$(echo "$INPUT" | jq -r '.tool_name')
case "$TOOL_NAME" in
"mcp__server__read_only")
# Light validation for read operations
;;
"mcp__server__write")
# Strict validation for write operations
;;
"mcp__server__delete")
# Extra confirmation for destructive operations
echo '{"hookSpecificOutput": {"permissionDecision": "ask", ...}}'
;;
esac
```
## References
- Official Hooks Documentation: https://docs.claude.com/en/docs/claude-code/hooks
- Plugin Hooks: https://docs.claude.com/en/docs/claude-code/hooks#plugin-hooks
- JSON Specification: https://www.json.org/
- Bash Best Practices: https://google.github.io/styleguide/shellguide.html

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# Plugins and Marketplaces Guide
## Overview
Plugins are collections of Claude Code components (agents, commands, skills) packaged for distribution and installation. Plugin marketplaces enable discovery and installation of plugins from repositories.
**Official Documentation**:
- Plugins: https://docs.claude.com/en/docs/claude-code/plugins.md
- Marketplaces: https://docs.claude.com/en/docs/claude-code/plugin-marketplaces.md
## Plugin Structure
A plugin is a directory containing Claude Code components with a marketplace configuration:
```
plugin-name/
├── .claude-plugin/
│ └── marketplace.json # Plugin metadata and component mapping
├── agents/ # Optional: custom agents
│ ├── agent-one.md
│ └── agent-two.md
├── commands/ # Optional: slash commands
│ ├── command-one.md
│ └── command-two.md
├── skills/ # Optional: skills
│ ├── skill-one/
│ │ └── SKILL.md
│ └── skill-two/
│ └── SKILL.md
├── SKILLS.md # Required if skills/ exists
└── README.md # Plugin documentation
```
## Plugin Metadata: plugin.json
Each plugin should include a `plugin.json` file in the `.claude-plugin/` directory:
```json
{
"name": "plugin-name",
"version": "1.0.0",
"description": "Brief description of what the plugin provides",
"author": "Your Name",
"repository": "https://github.com/username/repo",
"keywords": ["swift", "ios", "mobile"],
"category": "development"
}
```
### Fields
**`name`** (string, required)
- Unique identifier for the plugin
- Use kebab-case
- Example: `swift-engineer`, `technical-writer`
**`version`** (string, required)
- Semantic version number
- Format: `MAJOR.MINOR.PATCH`
- Example: `1.0.0`, `2.1.3`
**`description`** (string, required)
- Brief explanation of plugin purpose
- What components it provides
- Who should use it
**`author`** (string, optional)
- Plugin author name or organization
**`repository`** (string, optional)
- URL to source repository
- Enables users to browse code and contribute
**`keywords`** (array of strings, optional)
- Searchable tags
- Technologies, frameworks, use cases
- Example: `["swift", "ios", "xcode"]`
**`category`** (string, optional)
- Plugin category for organization
- Examples: `development`, `documentation`, `testing`, `deployment`
## Marketplace Configuration: marketplace.json
The `.claude-plugin/marketplace.json` file maps plugin components to their file locations:
```json
{
"marketplaceName": "marketplace-name",
"pluginRoot": "./plugins",
"plugins": [
{
"name": "plugin-name",
"source": "./plugins/plugin-name",
"version": "1.0.0",
"description": "Plugin description",
"keywords": ["keyword1", "keyword2"],
"category": "development",
"agents": {
"agent-name": "./agents/agent-name.md"
},
"commands": {
"command-name": "./commands/command-name.md"
},
"skills": {
"skill-name": "./skills/skill-name"
}
}
]
}
```
### Marketplace Fields
**`marketplaceName`** (string)
- Unique identifier for the marketplace
- Used in installation: `/plugin install name@marketplace-name`
**`pluginRoot`** (string)
- Relative path to directory containing all plugins
- Usually `"./plugins"`
**`plugins`** (array)
- List of all plugins in the marketplace
- Each plugin has metadata and component mappings
### Plugin Entry Fields
**`name`** (string, required)
- Plugin identifier
- Must match plugin.json name
**`source`** (string, required)
- Relative path from repository root to plugin directory
- **Must use `./` prefix**: `"./plugins/plugin-name"`
- This is critical for proper plugin discovery
**`version`** (string, required)
- Plugin version, should match plugin.json
**`description`** (string, required)
- Plugin description, should match plugin.json
**`keywords`** (array, optional)
- Searchable keywords
**`category`** (string, optional)
- Plugin category
**`agents`** (object, optional)
- Maps agent names to file paths
- Paths relative to plugin source directory
- Example: `{"ios-expert": "./agents/ios-expert.md"}`
**`commands`** (object, optional)
- Maps command names to file paths
- Paths relative to plugin source directory
- Example: `{"swift-lint": "./commands/swift-lint.md"}`
**`skills`** (object, optional)
- Maps skill names to directory paths
- Paths relative to plugin source directory
- Example: `{"ios-swift-expert": "./skills/ios-swift-expert"}`
### Path Requirements
**Critical**: All paths in marketplace.json must:
1. Be relative, not absolute
2. Use `./` prefix for the `source` field
3. Use forward slashes, even on Windows
4. Point to actual files/directories
**Good**:
```json
"source": "./plugins/swift-engineer"
"agents": {
"ios-expert": "./agents/ios-expert.md"
}
```
**Bad**:
```json
"source": "plugins/swift-engineer" // Missing ./
"source": "/absolute/path/to/plugin" // Absolute path
"agents": {
"ios-expert": "agents\\ios-expert.md" // Backslashes
}
```
## Creating a Plugin
### 1. Plan Your Plugin
Determine:
- What problem does it solve?
- What components are needed (agents, commands, skills)?
- Who is the target audience?
- What tools and workflows will it provide?
### 2. Create Directory Structure
```bash
mkdir -p plugin-name/.claude-plugin
mkdir -p plugin-name/agents
mkdir -p plugin-name/commands
mkdir -p plugin-name/skills
```
### 3. Create plugin.json
```bash
cat > plugin-name/.claude-plugin/plugin.json << 'EOF'
{
"name": "plugin-name",
"version": "1.0.0",
"description": "Your plugin description",
"author": "Your Name",
"keywords": ["tag1", "tag2"],
"category": "development"
}
EOF
```
### 4. Add Components
Create agents, commands, and/or skills following their respective guides:
- See `subagents-guide.md` for agent creation
- See `slash-commands-guide.md` for command creation
- See `skills-guide.md` for skill creation
### 5. Create Documentation
**README.md**:
```markdown
# Plugin Name
Brief description of what the plugin does.
## Components
### Agents
- **agent-name**: Description of agent
### Commands
- **/command-name**: Description of command
### Skills
- **skill-name**: Description of skill
## Installation
Add the marketplace:
\`\`\`
/plugin marketplace add <repository-url>
\`\`\`
Install the plugin:
\`\`\`
/plugin install plugin-name@marketplace-name
\`\`\`
## Usage
[Usage examples and documentation]
```
**SKILLS.md** (if plugin includes skills):
```markdown
# Plugin Skills
## skill-name
Description of what the skill does and when it activates.
### What It Provides
- Capability 1
- Capability 2
### Example Usage
[Brief example]
```
### 6. Register in Marketplace
Add plugin entry to marketplace.json:
```json
{
"marketplaceName": "your-marketplace",
"pluginRoot": "./plugins",
"plugins": [
{
"name": "plugin-name",
"source": "./plugins/plugin-name",
"version": "1.0.0",
"description": "Your plugin description",
"keywords": ["tag1", "tag2"],
"category": "development",
"agents": {
"agent-name": "./agents/agent-name.md"
},
"commands": {
"command-name": "./commands/command-name.md"
},
"skills": {
"skill-name": "./skills/skill-name"
}
}
]
}
```
## Installing Plugins
### Add Marketplace
```bash
/plugin marketplace add /path/to/marketplace
# or
/plugin marketplace add https://github.com/user/marketplace
```
### List Available Plugins
```bash
/plugin list marketplace-name
```
### Install Plugin
```bash
/plugin install plugin-name@marketplace-name
```
### Verify Installation
Check that agents, commands, and skills are available:
- Agents: Use Task tool with subagent_type
- Commands: Type `/command-name`
- Skills: Should activate automatically based on context
## Best Practices
### Plugin Design
**Do:**
- Focus on a specific domain or use case
- Provide comprehensive documentation
- Include usage examples
- Follow semantic versioning
- Test all components before publishing
**Don't:**
- Create overly broad, unfocused plugins
- Duplicate existing functionality
- Include untested components
- Use absolute paths in configurations
### Component Organization
**Agents**: Use when delegatable workflows need isolation
**Commands**: Use for keyboard shortcuts and parameterized tasks
**Skills**: Use for automatic, context-aware guidance
Most plugins should favor **skills** over agents for better UX (automatic activation).
### Documentation
Include in README:
- What problem the plugin solves
- Complete component listing
- Installation instructions
- Usage examples
- Common workflows
- Troubleshooting
Include in SKILLS.md:
- Detailed skill descriptions
- Activation triggers
- What capabilities each skill provides
- Usage examples
### Versioning
Follow semantic versioning:
- **MAJOR**: Breaking changes, incompatible updates
- **MINOR**: New features, backward compatible
- **PATCH**: Bug fixes, backward compatible
Update version in both:
- `plugin.json`
- `marketplace.json` plugin entry
### Testing
Before publishing:
1. **Validate JSON**:
```bash
cat .claude-plugin/marketplace.json | python -m json.tool
cat .claude-plugin/plugin.json | python -m json.tool
```
2. **Test installation**:
```bash
/plugin marketplace add /path/to/your/repo
/plugin install plugin-name@marketplace-name
```
3. **Test components**:
- Invoke each agent
- Run each command
- Trigger each skill
- Verify all work as expected
4. **Verify paths**:
- All files referenced in marketplace.json exist
- Paths are relative with proper `./` prefix
- No broken links in documentation
## Common Patterns
### Single-Purpose Plugin
Plugin with one focused capability:
```
swift-engineer/
├── .claude-plugin/
│ └── plugin.json
├── skills/
│ └── ios-swift-expert/
│ └── SKILL.md
├── commands/
│ └── swift-lint.md
├── SKILLS.md
└── README.md
```
### Multi-Component Plugin
Plugin with multiple related capabilities:
```
web-development/
├── .claude-plugin/
│ └── plugin.json
├── agents/
│ ├── react-expert.md
│ └── api-designer.md
├── commands/
│ ├── create-component.md
│ └── run-dev-server.md
├── skills/
│ ├── react-patterns/
│ │ └── SKILL.md
│ └── api-testing/
│ └── SKILL.md
├── SKILLS.md
└── README.md
```
### Plugin Collection Marketplace
Multiple related plugins in one marketplace:
```
marketplace/
├── .claude-plugin/
│ └── marketplace.json
└── plugins/
├── plugin-one/
│ ├── .claude-plugin/
│ │ └── plugin.json
│ └── [components]
├── plugin-two/
│ ├── .claude-plugin/
│ │ └── plugin.json
│ └── [components]
└── plugin-three/
├── .claude-plugin/
│ └── plugin.json
└── [components]
```
## Marketplace Management
### Adding New Plugins
1. Create plugin directory in `plugins/`
2. Add plugin metadata to `.claude-plugin/plugin.json`
3. Create components
4. Register in `.claude-plugin/marketplace.json`
5. Update main README
6. Test installation
### Updating Plugins
1. Make changes to plugin components
2. Update version in `plugin.json`
3. Update version in `marketplace.json`
4. Document changes in plugin README
5. Test updated plugin
6. Commit and push
### Deprecating Plugins
1. Mark as deprecated in description
2. Add deprecation notice to README
3. Suggest alternative plugins
4. Keep available for backward compatibility
5. Eventually remove from marketplace
## Distribution
### Local Distribution
Share repository path:
```bash
/plugin marketplace add /path/to/marketplace
```
### Git Repository
Host on GitHub/GitLab:
```bash
/plugin marketplace add https://github.com/user/marketplace
```
### Documentation
Provide clear instructions:
1. How to add the marketplace
2. How to install plugins
3. What each plugin provides
4. Usage examples
5. Troubleshooting
## Troubleshooting
### Plugin Not Found
**Issue**: `/plugin install plugin-name@marketplace-name` fails
**Solutions**:
- Verify marketplace is added: `/plugin marketplace list`
- Check plugin name matches marketplace.json
- Ensure marketplace.json is valid JSON
- Verify `source` path has `./` prefix
### Components Not Available
**Issue**: Installed plugin components don't appear
**Solutions**:
- Check component paths in marketplace.json
- Verify files exist at specified paths
- Ensure YAML frontmatter is valid (agents, skills)
- Restart Claude Code session
### Invalid Marketplace JSON
**Issue**: Marketplace JSON validation fails
**Solutions**:
- Validate with JSON linter
- Check for trailing commas
- Verify all paths use forward slashes
- Ensure proper quote escaping
### Skill Not Activating
**Issue**: Skill doesn't trigger in expected contexts
**Solutions**:
- Review skill description for trigger keywords
- Add more specific context triggers
- Verify SKILL.md has valid frontmatter
- Check skill is registered in marketplace.json
## Example: Complete Plugin
**Directory structure**:
```
swift-engineer/
├── .claude-plugin/
│ └── plugin.json
├── agents/
│ └── ios-swift-expert.md
├── commands/
│ └── swift-lint.md
├── skills/
│ └── ios-swift-expert/
│ ├── SKILL.md
│ └── references/
│ └── swift-style-guide.md
├── SKILLS.md
└── README.md
```
**plugin.json**:
```json
{
"name": "swift-engineer",
"version": "1.0.0",
"description": "iOS and macOS development expertise with Swift tooling",
"author": "Scott Jungling",
"repository": "https://github.com/username/claude-plugins",
"keywords": ["swift", "ios", "macos", "xcode", "swiftui"],
"category": "development"
}
```
**marketplace.json entry**:
```json
{
"name": "swift-engineer",
"source": "./plugins/swift-engineer",
"version": "1.0.0",
"description": "iOS and macOS development expertise with Swift tooling",
"keywords": ["swift", "ios", "macos", "xcode", "swiftui"],
"category": "development",
"agents": {
"ios-swift-expert": "./agents/ios-swift-expert.md"
},
"commands": {
"swift-lint": "./commands/swift-lint.md"
},
"skills": {
"ios-swift-expert": "./skills/ios-swift-expert"
}
}
```
**README.md**:
```markdown
# Swift Engineer Plugin
Expert iOS and macOS development assistance with Swift tooling.
## Components
### Skills
**ios-swift-expert**: Automatically activates when working with Swift, SwiftUI, UIKit, Xcode projects, or Apple frameworks. Provides expert guidance on iOS/macOS development.
### Commands
**/swift-lint**: Format and lint Swift code using swift-format
### Agents
**ios-swift-expert**: Delegatable iOS/macOS development expert (prefer using the skill for automatic activation)
## Installation
Add the marketplace:
\`\`\`
/plugin marketplace add https://github.com/username/claude-plugins
\`\`\`
Install the plugin:
\`\`\`
/plugin install swift-engineer@claude-plugins
\`\`\`
## Usage
The ios-swift-expert skill activates automatically when working with Swift code. For example:
- Opening .swift files
- Discussing SwiftUI layouts
- Debugging iOS apps
- Configuring Xcode projects
Use the `/swift-lint` command to format code:
\`\`\`
/swift-lint
\`\`\`
## Requirements
- swift-format installed for linting command
- Xcode for iOS/macOS development
## License
MIT
```
This comprehensive setup provides users with automatic expertise (skill), convenient shortcuts (command), and delegatable workflows (agent).

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# Skills Creation Guide
## Overview
Skills are reusable prompt templates that Claude Code automatically invokes based on context. They provide guidance, patterns, and workflows that activate when relevant without explicit user invocation.
**Official Documentation**: https://docs.claude.com/en/docs/agents-and-tools/agent-skills/overview.md
## When to Create a Skill
Create a skill when you need:
- Automatic activation based on context or keywords
- Always-available guidance for specific tasks
- Reusable patterns that apply across projects
- Reference materials bundled with prompts
- Workflows that should be followed consistently
## Directory Structure
Skills are directories containing a `SKILL.md` file and optional bundled resources:
```
skill-name/
├── SKILL.md # Required: main skill definition
├── references/ # Optional: docs loaded into context as needed
│ ├── guide.md
│ └── examples.md
├── assets/ # Optional: files used in output (not loaded into context)
│ ├── templates/
│ │ └── component.tsx
│ └── logo.png
└── scripts/ # Optional: executable utilities
└── helper.py
```
### Location
- Personal: `~/.claude/skills/`
- Plugin: `<plugin-root>/skills/`
- Project: `.claude/skills/`
## SKILL.md Format
Skills require YAML frontmatter followed by the skill content:
```markdown
---
name: skill-name
description: Detailed description including when to use this skill and specific triggers
---
[Skill prompt content with instructions, examples, and guidance]
```
## YAML Frontmatter Fields
**CRITICAL**: Skills support ONLY two frontmatter fields. Do not add any other fields.
### Required Fields
**`name`** (string, max 64 characters)
- Unique identifier for the skill
- Use kebab-case
- Should match directory name
- Example: `ios-swift-expert`, `test-driven-development`
**`description`** (string, max 1024 characters)
- Comprehensive description of what the skill does
- **Critical**: Must include when to use the skill and specific trigger contexts
- Should mention key technologies, frameworks, or patterns
- Used by Claude Code to determine when to activate the skill
- Example:
```yaml
description: Use when working with iOS or macOS development projects, including Swift code, SwiftUI interfaces, Xcode project configuration, iOS frameworks, app architecture, debugging iOS apps, or any Apple platform development tasks.
```
### No Other Fields Are Supported
Unlike subagents, skills only support `name` and `description` in frontmatter. Configuration is done through the skill content itself.
**INVALID - Do Not Use:**
```yaml
---
name: my-skill
description: Valid description
version: 1.0.0 # ❌ NOT SUPPORTED
when_to_use: ... # ❌ NOT SUPPORTED
author: ... # ❌ NOT SUPPORTED
tags: ... # ❌ NOT SUPPORTED
---
```
**Note**: You may encounter skills from other repositories (e.g., superpowers) that use additional fields like `version` or `when_to_use`. These are custom conventions specific to those repositories and are NOT part of the official Claude Code skill specification. Do not copy these fields into Claude Code skills.
## Description Best Practices
The description is **critical** for skill activation. It should:
1. **Use third-person voice**: Write "Expert in X. Automatically activates when..." rather than "Use when..."
2. **List specific technologies**: Mention frameworks, languages, tools
3. **Include task types**: Design, debugging, testing, refactoring, etc.
4. **Reference file patterns**: File extensions, naming patterns
5. **Specify contexts**: Project types, scenarios, workflows
**Good Examples:**
```yaml
description: Expert in iterative design refinement. Automatically activates when creating or developing anything before writing code or implementation plans - refines rough ideas into fully-formed designs through structured Socratic questioning, alternative exploration, and incremental validation
```
```yaml
description: Expert in systematic debugging. Automatically activates when encountering any bug, test failure, or unexpected behavior before proposing fixes - four-phase framework (root cause investigation, pattern analysis, hypothesis testing, implementation) that ensures understanding before attempting solutions
```
```yaml
description: Expert in iOS and macOS development. Automatically activates when working with Swift code, SwiftUI interfaces, Xcode project configuration, iOS frameworks, app architecture, debugging iOS apps, or any Apple platform development tasks
```
**Poor Examples:**
```yaml
description: Helps with Swift development
# Too vague - no trigger contexts, not third-person
```
```yaml
description: Use when building microservices
# Second-person voice instead of third-person
```
```yaml
description: A comprehensive guide to building scalable microservices architectures using cloud-native patterns
# Doesn't clearly state when to activate
```
## Writing Style
Write the entire skill using **imperative/infinitive form** (verb-first instructions), not second person. Use objective, instructional language that Claude can follow directly.
**Do** (Imperative/Infinitive):
- "To accomplish X, do Y"
- "Start with step 1"
- "Analyze the code for patterns"
- "Create a test file"
- "Avoid using global state"
**Don't** (Second Person):
- "You should do X"
- "If you need to do X"
- "You can analyze the code"
- "You will create a test file"
- "You shouldn't use global state"
This style maintains consistency and clarity for AI consumption while keeping the skill content focused on actionable instructions rather than conversational guidance.
## Skill Creation Workflow
Follow this structured process to create effective skills:
### Step 1: Understand the Skill with Concrete Examples
Skip this step only when the skill's usage patterns are already clearly understood.
Clearly understand concrete examples of how the skill will be used. Gather these through:
- Direct user examples of tasks they perform repeatedly
- Generated examples that are validated with user feedback
- Real-world scenarios from past work
**Key questions to answer**:
- What functionality should the skill support?
- What specific tasks would trigger this skill?
- What would a user say or do that should activate it?
- What file types, technologies, or contexts are involved?
Avoid overwhelming with too many questions at once. Start with the most important and follow up as needed.
**Conclude when**: There is a clear sense of the functionality the skill should support.
### Step 2: Plan the Reusable Skill Contents
Analyze each concrete example to identify what bundled resources would help:
For each example, consider:
1. How to execute the task from scratch
2. What gets rewritten repeatedly (→ candidate for `scripts/`)
3. What documentation would help (→ candidate for `references/`)
4. What templates or assets would help (→ candidate for `assets/`)
**Example analysis**:
- "Help me rotate this PDF" → `scripts/rotate_pdf.py` (same code rewritten each time)
- "Build me a todo app" → `assets/frontend-template/` (same boilerplate each time)
- "Query user data from BigQuery" → `references/schema.md` (need to rediscover schemas each time)
**Output**: A list of scripts, references, and assets to include in the skill.
### Step 3: Initialize the Skill
Create the skill structure using the initialization script from the Anthropic skills repository:
```bash
uvx --from git+https://github.com/anthropics/skills init_skill.py <skill-name> --path <output-directory>
```
This script:
- Creates the skill directory at the specified path
- Generates a SKILL.md template with proper frontmatter and placeholders
- Creates example resource directories: `scripts/`, `references/`, and `assets/`
- Adds example files in each directory that can be customized or deleted
**Alternative**: Manually create the directory structure if the script is not available, but the script ensures proper formatting and structure.
### Step 4: Implement the Skill
**Start with bundled resources**:
1. Create the scripts, references, and assets identified in Step 2
2. This may require user input (e.g., brand assets, company documentation)
3. Delete any example files/directories not needed for the skill
**Update SKILL.md**:
Answer these questions in the skill content:
1. What is the purpose of the skill? (brief overview)
2. When should the skill be used? (activation contexts)
3. How should Claude use the skill in practice?
**Remember**:
- Use third-person voice in description
- Use imperative/infinitive form in skill content
- Reference all bundled resources so Claude knows how to use them
- Keep SKILL.md lean; move detailed content to references files
- Include concrete examples where helpful
### Step 5: Package and Validate the Skill
Package the skill into a distributable format using the packaging script:
```bash
uvx --from git+https://github.com/anthropics/skills package_skill.py <path/to/skill-folder> [output-directory]
```
The script will:
1. **Validate** the skill automatically:
- YAML frontmatter format and required fields
- Skill naming conventions and directory structure
- Description completeness and quality
- File organization and resource references
2. **Package** the skill if validation passes:
- Creates a zip file named after the skill (e.g., `my-skill.zip`)
- Includes all files with proper directory structure
- Ready for distribution or installation
If validation fails, fix the reported errors and run again.
### Step 6: Test and Iterate
After testing the skill in real usage:
1. Use the skill on real tasks
2. Notice struggles or inefficiencies
3. Identify how SKILL.md or bundled resources should be updated
4. Implement changes and test again
**Common iterations**:
- Refining description to improve activation triggers
- Moving content between SKILL.md and references files
- Adding missing examples or patterns
- Creating additional scripts for repeated tasks
## Skill Content Structure
### Recommended Sections
1. **Quick Start** - Immediate, actionable guidance
```markdown
## Quick Start
When [trigger context], follow these steps:
1. [Step 1]
2. [Step 2]
3. [Step 3]
```
2. **Core Principles** - Fundamental concepts
```markdown
## Core Principles
- Principle 1: [explanation]
- Principle 2: [explanation]
```
3. **Workflows** - Step-by-step processes
```markdown
## Workflow
### [Specific Task]
1. [Step with details]
2. [Step with details]
```
4. **Examples** - Concrete usage scenarios
```markdown
## Examples
<example>
Context: [scenario]
user: [user request]
assistant: [correct response]
</example>
```
5. **Common Pitfalls** - What to avoid
```markdown
## Common Pitfalls
**Don't:**
- [Pitfall 1]
- [Pitfall 2]
**Do:**
- [Best practice 1]
- [Best practice 2]
```
6. **References** - Links to bundled materials
```markdown
## Bundled Resources
See `references/guide.md` for detailed patterns.
See `assets/templates/template.txt` for starter code.
```
## Bundling Reference Materials
Skills can include supporting files in the skill directory. Understanding when and how to use each type is critical for effective skill design.
### Progressive Disclosure: 3-Level Loading System
Skills use a three-level loading system to manage context efficiently:
1. **Metadata (name + description)** - Always loaded into context (~100 words)
2. **SKILL.md body** - Loaded when skill triggers (<5k words recommended)
3. **Bundled resources** - Loaded as needed by Claude (varies by type)
This design keeps the context window lean while making specialized knowledge available when needed.
### Resource Types and Context Loading
**Critical distinction**: Different resource types have different relationships with the context window.
#### Scripts (`scripts/`)
**Purpose**: Executable code (Python, Bash, etc.) for tasks requiring deterministic reliability or repeatedly rewritten code.
**Context loading**: May be executed **without loading into context window**
**When to include**:
- Same code is being rewritten repeatedly
- Deterministic reliability is needed
- Task is procedural and automatable
**Examples**:
- `scripts/rotate_pdf.py` - PDF rotation utility
- `scripts/validate_schema.sh` - Schema validation
- `scripts/generate_boilerplate.py` - Code generation
**Benefits**: Token efficient, deterministic, can execute without reading into context
**Note**: Scripts may still need to be read by Claude for patching or environment-specific adjustments
#### References (`references/`)
**Purpose**: Documentation and reference material **loaded INTO context as needed** to inform Claude's process and thinking.
**Context loading**: **YES** - Loaded into context when Claude determines it's needed
**When to include**:
- Documentation that Claude should reference while working
- Detailed information too extensive for SKILL.md
- Domain knowledge, schemas, or specifications
- Detailed workflow guides or examples
**Examples**:
- `references/database_schema.md` - Database table structures
- `references/api_docs.md` - API specifications
- `references/company_policies.md` - Company-specific guidelines
- `references/advanced_patterns.md` - Detailed implementation patterns
**Benefits**: Keeps SKILL.md lean while making detailed information discoverable and loadable on demand
**Best practice for large files**: If reference files exceed 10k words, include grep search patterns in SKILL.md to help Claude find relevant sections efficiently.
#### Assets (`assets/`)
**Purpose**: Files **NOT intended to be loaded into context**, but rather **used within the output** Claude produces.
**Context loading**: **NO** - Not loaded into context; copied, modified, or used in final output
**When to include**:
- Files that will be used in the final output
- Templates that get copied or modified
- Images, fonts, or other binary resources
- Boilerplate code or project scaffolding
**Examples**:
- `assets/templates/component-template.tsx` - React component boilerplate
- `assets/logo.png` - Brand assets
- `assets/slides-template.pptx` - PowerPoint template
- `assets/frontend-skeleton/` - Complete project starter
**Benefits**: Separates output resources from documentation, enables Claude to use files without loading them into context
### Avoid Duplication
**Important principle**: Information should live in either SKILL.md or references files, **not both**.
Prefer references files for detailed information unless it's truly core to the skill—this keeps SKILL.md lean while making information discoverable without hogging the context window. Keep only essential procedural instructions and workflow guidance in SKILL.md; move detailed reference material, schemas, and examples to references files.
### Runtime Environment Constraints
**Important**: Skills run in Claude Code's runtime environment:
- No network access during skill execution
- No package installation during execution
- Must be self-contained
- Can reference bundled materials
- Scripts can execute if dependencies are available in the environment
## Naming Conventions
- Use **kebab-case** for skill directory names
- Be descriptive and searchable
- Indicate domain or capability
- Match the `name` field in SKILL.md
- Examples:
- `ios-swift-expert`
- `test-driven-development`
- `systematic-debugging`
- `brainstorming`
## Skills vs Subagents vs Commands
**Use Skills when:**
- Guidance should activate automatically
- Users shouldn't need to remember to invoke it
- Pattern applies across many contexts
- You want always-available best practices
- Example: Code style guides, testing patterns
**Use Subagents when:**
- You need explicit invocation control
- Workflow is delegatable and isolated
- You need different tool restrictions
- Context isolation is important
- Example: Specialized code reviews, complex migrations
**Use Commands when:**
- Workflow is simple and linear
- You want a keyboard shortcut
- No complex decision-making needed
- Example: Format code, run tests
## Testing Your Skill
1. **Verify Activation Context**
- Create test scenarios matching your description
- Check if skill activates appropriately
- Refine description triggers if needed
2. **Test Instructions**
- Follow the skill guidance yourself
- Ensure steps are clear and actionable
- Verify examples are correct
3. **Validate References**
- Ensure bundled files are accessible
- Check file paths are correct
- Test any included scripts
4. **YAML Validation**
- Verify frontmatter is valid YAML
- Check name/description lengths
- Ensure no unsupported fields
## Plugin Integration
When including skills in plugins:
1. Create `skills/` subdirectory in plugin root
2. Place each skill in its own directory under `skills/`
3. Create `SKILLS.md` index file (required for plugin skills)
4. Register in `.claude-plugin/marketplace.json`:
```json
{
"skills": {
"skill-name": "./skills/skill-name"
}
}
```
### SKILLS.md Index Format
The `SKILLS.md` file documents all skills in the plugin:
```markdown
# Plugin Skills
This plugin provides the following skills:
## skill-name
[Description from SKILL.md]
### When to Use
- [Trigger scenario 1]
- [Trigger scenario 2]
### What It Provides
- [Capability 1]
- [Capability 2]
### Example Usage
[Brief example]
---
## another-skill
[Description and details for next skill]
```
## Example: Complete Skill
```markdown
---
name: api-testing-patterns
description: Expert in API testing patterns. Automatically activates when writing tests for REST APIs, GraphQL endpoints, or API integration tests - provides patterns for request mocking, response validation, authentication testing, and error scenario coverage
---
# API Testing Patterns
## Quick Start
When testing API endpoints:
1. **Arrange**: Set up test data and mocks
2. **Act**: Make the API request
3. **Assert**: Validate response status, headers, and body
4. **Cleanup**: Reset state for next test
## Core Principles
- **Test contracts, not implementation**: Focus on API behavior and response formats
- **Cover happy path and edge cases**: Success, validation errors, authentication failures
- **Mock external dependencies**: Don't hit real external APIs in tests
- **Use test fixtures**: Maintain consistent test data
- **Validate schemas**: Ensure responses match expected structure
## REST API Testing Patterns
### Basic Request/Response Test
```javascript
test('GET /users/:id returns user', async () => {
const response = await request(app)
.get('/users/123')
.set('Authorization', 'Bearer test-token')
.expect(200)
.expect('Content-Type', /json/);
expect(response.body).toMatchObject({
id: '123',
name: expect.any(String),
email: expect.any(String)
});
});
```
### Testing Error Scenarios
```javascript
test('GET /users/:id returns 404 for missing user', async () => {
const response = await request(app)
.get('/users/nonexistent')
.set('Authorization', 'Bearer test-token')
.expect(404);
expect(response.body).toEqual({
error: 'User not found',
code: 'USER_NOT_FOUND'
});
});
```
### Testing Authentication
```javascript
test('requires valid authentication token', async () => {
await request(app)
.get('/users/123')
.expect(401);
await request(app)
.get('/users/123')
.set('Authorization', 'Bearer invalid-token')
.expect(401);
});
```
## GraphQL Testing Patterns
### Query Testing
```javascript
test('users query returns list of users', async () => {
const query = `
query {
users {
id
name
email
}
}
`;
const response = await request(app)
.post('/graphql')
.send({ query })
.expect(200);
expect(response.body.data.users).toBeInstanceOf(Array);
expect(response.body.errors).toBeUndefined();
});
```
### Mutation Testing
```javascript
test('createUser mutation creates user', async () => {
const mutation = `
mutation CreateUser($input: UserInput!) {
createUser(input: $input) {
id
name
email
}
}
`;
const variables = {
input: {
name: 'Test User',
email: 'test@example.com'
}
};
const response = await request(app)
.post('/graphql')
.send({ query: mutation, variables })
.expect(200);
expect(response.body.data.createUser).toMatchObject({
id: expect.any(String),
name: 'Test User',
email: 'test@example.com'
});
});
```
## Common Pitfalls
**Don't:**
- Test internal implementation details
- Make real API calls to external services
- Share state between tests
- Use hardcoded timestamps or IDs
- Skip error scenario testing
**Do:**
- Mock external dependencies
- Use test fixtures and factories
- Validate response schemas
- Test all status codes
- Clean up after each test
## Test Organization
```
tests/
├── api/
│ ├── users.test.js
│ ├── posts.test.js
│ └── auth.test.js
├── fixtures/
│ ├── users.js
│ └── posts.js
└── helpers/
├── setup.js
└── mock-server.js
```
## References
- See `references/http-status-codes.md` for complete status code reference
- See `assets/templates/api-test-template.js` for test boilerplate
- See `references/examples/complete-api-test-suite.js` for comprehensive examples
```
## Advanced Patterns
### Conditional Guidance
Use examples with different contexts to show when to apply different approaches:
```markdown
<example>
Context: Simple CRUD API with few endpoints
Recommended: Use inline test data
</example>
<example>
Context: Complex API with many interdependent resources
Recommended: Use factory pattern with test fixtures
</example>
```
### Progressive Disclosure
Start with quick patterns, then link to detailed references:
```markdown
## Quick Pattern
Use this for most cases:
[Simple example]
## Advanced Scenarios
For complex cases, see `references/advanced-patterns.md`:
- Nested resource testing
- Streaming response validation
- Webhook testing
```
### Checklists
Include actionable checklists for systematic execution:
```markdown
## API Test Checklist
Before merging API changes:
- [ ] Happy path tested with valid input
- [ ] Validation errors tested with invalid input
- [ ] Authentication/authorization tested
- [ ] Rate limiting tested
- [ ] Response schema validated
- [ ] Error responses follow format
- [ ] Documentation updated
```
## Skill Discovery
Skills are automatically discovered by Claude Code when:
- Placed in recognized skill directories
- SKILL.md has valid YAML frontmatter
- Name and description fields are present
- Plugin marketplace.json correctly references the skill
Claude Code uses the description to determine when to activate each skill, so make descriptions comprehensive and trigger-focused.

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# Slash Commands Creation Guide
## Overview
Slash commands are custom shortcuts that execute specific workflows or expand into prompts. They provide quick access to common operations and can accept arguments for dynamic behavior.
**Official Documentation**: https://docs.claude.com/en/docs/claude-code/slash-commands.md
## When to Create a Slash Command
Create a slash command when you need:
- Quick keyboard shortcuts for common tasks
- Parameterized workflows with user input
- Simple, linear execution flows
- Convenience wrappers around common operations
- Reusable prompts with argument substitution
## File Structure
Slash commands are markdown files that can optionally include YAML frontmatter:
```markdown
---
description: Clear one-line description of what this command does
allowed-tools:
- Bash(npm run build:*)
- Bash(npm test:*)
args:
- name: target
description: The build target to compile
---
[Command prompt content with instructions and optional argument placeholders]
```
### Location
- Personal: `~/.claude/commands/`
- Plugin: `<plugin-root>/commands/`
- Project: `.claude/commands/`
### Naming
- Use **kebab-case** for command file names
- File name becomes the command name
- `format-code.md` → `/format-code`
- `run-tests.md` → `/run-tests`
## YAML Frontmatter
Frontmatter is **optional** but recommended for:
- Documenting command purpose
- Preapproving tools and bash commands
- Defining expected arguments
### Fields
**`description`** (string, optional)
- One-line explanation of command purpose
- Shown in command lists and help
- Example: `Format and lint Swift code using swift-format`
**`allowed-tools`** (array, optional)
- Preapprove bash commands and tools for execution
- Uses glob patterns for flexibility
- Reduces user approval friction
- Example:
```yaml
allowed-tools:
- Bash(echo:*)
- Bash(git:*)
- Bash(npm run build:*)
- Bash(swift-format:*)
```
**`args`** (array of objects, optional)
- Document expected command arguments
- Each arg has `name` and `description`
- For documentation only - doesn't enforce validation
- Example:
```yaml
args:
- name: environment
description: Target environment (dev, staging, prod)
- name: version
description: Version tag to deploy
```
## Tool Preapprovals
The `allowed-tools` field uses specific syntax:
### Bash Commands
```yaml
allowed-tools:
- Bash(command:*) # Allow command with any arguments
- Bash(git:*) # Allow all git commands
- Bash(npm run build:*) # Allow npm run build variants
- Bash(echo:*) # Allow echo
- Bash(find:*) # Allow find
```
### Other Tools
You can also preapprove Claude Code tools:
```yaml
allowed-tools:
- Read
- Write
- Edit
- Glob
- Grep
- Bash(*) # Allow all bash commands (use carefully)
```
### Best Practices
**Do:**
- Be specific with command patterns
- Use wildcards for argument flexibility
- Include only necessary commands
- Consider security implications
**Don't:**
- Preapprove dangerous commands (rm -rf, etc.) unless absolutely necessary
- Use `Bash(*)` unless you fully trust the command
- Preapprove commands not used by the workflow
## Argument Handling
Commands can accept and use arguments through placeholders:
### Argument Placeholders
- `$ARGUMENTS` - All arguments as a single string
- `$1`, `$2`, `$3`, etc. - Individual positional arguments
- `$N` - Nth argument (1-indexed)
### Example: Parameterized Command
```markdown
---
description: Deploy application to specified environment
allowed-tools:
- Bash(git:*)
- Bash(npm run deploy:*)
args:
- name: environment
description: Target environment (dev, staging, prod)
---
Deploy the application to the $1 environment.
Steps:
1. Verify the git branch is clean
2. Run the deployment script for $1
3. Verify deployment succeeded
4. Update deployment tracking
Use: /deploy prod
```
Usage: `/deploy staging` → `$1` becomes `staging`
### Example: Multiple Arguments
```markdown
---
description: Create a new feature branch
allowed-tools:
- Bash(git:*)
args:
- name: branch-name
description: Name of the feature branch
- name: base-branch
description: Base branch to branch from (default: main)
---
Create a new feature branch named "$1" from base branch "$2".
1. Checkout the base branch: $2
2. Pull latest changes
3. Create and checkout new branch: $1
4. Push the new branch to remote
Use: /create-branch my-feature main
```
Usage: `/create-branch user-auth develop` → `$1` = `user-auth`, `$2` = `develop`
## Command Content
The markdown content after frontmatter is the command's prompt/instructions:
### Simple Commands
Direct instructions that execute immediately:
```markdown
---
description: Run the test suite
allowed-tools:
- Bash(npm test:*)
---
Run the complete test suite using npm test. Report any failures with details.
```
### Workflow Commands
Multi-step processes with clear guidance:
```markdown
---
description: Prepare a release
allowed-tools:
- Bash(git:*)
- Bash(npm:*)
args:
- name: version
description: Semantic version for the release (e.g., 1.2.3)
---
Prepare a new release version $1:
1. Update version in package.json to $1
2. Update CHANGELOG.md with version $1 and today's date
3. Commit changes with message "chore: prepare release $1"
4. Create git tag v$1
5. Build the project
6. Ask user if ready to push tag and publish
Use: /prepare-release 1.2.3
```
### Commands with Subagents
Delegate complex work to specialized agents:
```markdown
---
description: Write comprehensive API documentation
allowed-tools:
- Task
---
Use the technical-writer agent to create comprehensive API documentation for the current project.
The documentation should include:
- API overview and getting started
- Authentication guide
- Endpoint reference with examples
- Error handling
- Rate limiting
- Code examples in multiple languages
Analyze the codebase first, then delegate to the technical-writer agent.
```
## Common Patterns
### Code Quality Commands
```markdown
---
description: Format and lint Swift code
allowed-tools:
- Bash(swift-format:*)
- Bash(find:*)
---
Format and lint all Swift code in the project:
1. Find all .swift files
2. Run swift-format on each file
3. Report any formatting issues
4. Fix issues automatically where possible
```
### Git Workflow Commands
```markdown
---
description: Create a conventional commit
allowed-tools:
- Bash(git:*)
---
Create a conventional commit following the format:
type(scope): description
Where type is one of: feat, fix, docs, style, refactor, test, chore
1. Show current git status
2. Ask user for commit type and scope
3. Ask for commit description
4. Create commit with conventional format
5. Include Claude Code co-author
```
### Project Setup Commands
```markdown
---
description: Initialize a new TypeScript project
allowed-tools:
- Bash(npm:*)
- Bash(mkdir:*)
- Write
---
Initialize a new TypeScript project with best practices:
1. Create directory structure (src/, tests/, dist/)
2. Initialize npm package
3. Install TypeScript and development dependencies
4. Create tsconfig.json with strict settings
5. Create initial src/index.ts
6. Set up test framework
7. Create README.md
Ask user for project name and description first.
```
### Deployment Commands
```markdown
---
description: Deploy to production
allowed-tools:
- Bash(git:*)
- Bash(npm run build:*)
- Bash(gh:*)
args:
- name: version
description: Version to deploy (defaults to current)
---
Deploy version $1 to production:
⚠️ WARNING: This will deploy to PRODUCTION
1. Confirm with user before proceeding
2. Verify git branch is main
3. Verify working directory is clean
4. Run production build
5. Run smoke tests
6. Create GitHub release
7. Trigger deployment pipeline
8. Monitor deployment status
Use: /deploy-prod 1.2.3
```
## Testing Your Command
1. **Invoke the command**:
```
/your-command arg1 arg2
```
2. **Verify behavior**:
- Do arguments substitute correctly?
- Are tools preapproved appropriately?
- Does the workflow execute as expected?
3. **Test edge cases**:
- Missing arguments
- Invalid arguments
- Error conditions
4. **Refine**:
- Update allowed-tools if approval prompts appear
- Clarify instructions if behavior is unexpected
- Add error handling guidance
## Commands vs Skills vs Subagents
**Use Commands when:**
- Workflow is straightforward and linear
- You want a quick keyboard shortcut
- Users will invoke explicitly
- Arguments customize behavior
- Example: /format-code, /run-tests, /deploy
**Use Skills when:**
- Guidance should activate automatically
- Pattern applies across contexts
- Always-available best practices
- No explicit invocation needed
- Example: Code style patterns, debugging workflows
**Use Subagents when:**
- Complex decision-making required
- Context isolation needed
- Delegatable, self-contained workflows
- Specialized tool restrictions
- Example: Code reviews, technical writing
## Plugin Integration
When including commands in plugins:
1. Place command markdown files in `commands/` subdirectory
2. Register in `.claude-plugin/marketplace.json`:
```json
{
"commands": {
"command-name": "./commands/command-name.md"
}
}
```
3. Document in plugin README.md
4. Test command installation and execution
## Example: Complete Command
```markdown
---
description: Create a new React component with tests and storybook
allowed-tools:
- Bash(mkdir:*)
- Write
- Edit
args:
- name: component-name
description: Name of the component (PascalCase)
- name: component-type
description: Type of component (functional or class, defaults to functional)
---
# Create React Component: $1
Create a new React component named $1 as a $2 component.
## Steps
1. **Create component directory**:
```
src/components/$1/
```
2. **Create component file**: `src/components/$1/$1.tsx`
```tsx
import React from 'react';
import styles from './$1.module.css';
interface ${1}Props {
// TODO: Define props
}
export const $1: React.FC<${1}Props> = (props) => {
return (
<div className={styles.container}>
<h2>$1</h2>
</div>
);
};
```
3. **Create styles**: `src/components/$1/$1.module.css`
```css
.container {
/* Component styles */
}
```
4. **Create test file**: `src/components/$1/$1.test.tsx`
```tsx
import { render, screen } from '@testing-library/react';
import { $1 } from './$1';
describe('$1', () => {
it('renders without crashing', () => {
render(<$1 />);
expect(screen.getByText('$1')).toBeInTheDocument();
});
});
```
5. **Create Storybook story**: `src/components/$1/$1.stories.tsx`
```tsx
import type { Meta, StoryObj } from '@storybook/react';
import { $1 } from './$1';
const meta: Meta<typeof $1> = {
title: 'Components/$1',
component: $1,
};
export default meta;
type Story = StoryObj<typeof $1>;
export const Default: Story = {
args: {},
};
```
6. **Create index file**: `src/components/$1/index.ts`
```ts
export { $1 } from './$1';
export type { ${1}Props } from './$1';
```
7. **Update main components index**: Add to `src/components/index.ts`:
```ts
export { $1 } from './$1';
```
## Usage Examples
```bash
# Create functional component (default)
/create-component Button
# Create class component
/create-component Modal class
```
## Next Steps
After creating the component:
1. Define the component props interface
2. Implement component logic
3. Add styles
4. Write comprehensive tests
5. Create Storybook stories for different states
6. Update documentation
```
## Advanced Techniques
### Conditional Logic
Guide Claude to make decisions based on arguments:
```markdown
If $1 is "production":
- Use production configuration
- Require manual confirmation
- Enable extra validation
If $1 is "development":
- Use development configuration
- Skip confirmation
- Allow warnings
```
### Error Handling
Include guidance for error scenarios:
```markdown
If the build fails:
1. Show the error output
2. Suggest common fixes
3. Ask user if they want to retry
If tests fail:
1. Report which tests failed
2. Show failure details
3. Ask if user wants to run only failed tests
```
### Checklists
Provide systematic validation:
```markdown
Before deploying:
- [ ] All tests pass
- [ ] Build succeeds
- [ ] Version updated
- [ ] CHANGELOG updated
- [ ] Git working directory clean
- [ ] On correct branch
```
## Security Considerations
**Be careful with:**
- Commands that modify production systems
- Commands that delete files or data
- Commands with elevated privileges
- Commands that expose secrets
**Best practices:**
- Require confirmation for destructive operations
- Validate inputs before execution
- Limit preapproved commands to minimum necessary
- Document security implications
- Consider using read-only operations where possible
## Discoverability
Users discover commands through:
- `/help` command output
- Plugin documentation
- Tab completion in Claude Code
- README files
Make commands discoverable by:
- Using clear, descriptive names
- Writing good descriptions in frontmatter
- Documenting in plugin README
- Using conventional naming patterns

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# Subagent Creation Guide
## Overview
Subagents are specialized AI agents with custom system prompts and behaviors. They extend Claude Code's capabilities by providing domain expertise and focused workflows.
**Official Documentation**: https://docs.claude.com/en/docs/claude-code/sub-agents.md
## When to Create a Subagent
Create a subagent when you need:
- Specialized domain expertise (e.g., iOS development, technical writing)
- Consistent behavior patterns for specific tasks
- Delegatable workflows that run independently
- Context isolation from the main session
## File Structure
Subagents are markdown files with YAML frontmatter:
```markdown
---
name: agent-name
description: Agent description with usage examples
model: inherit
color: green
tools: Read, Write, Edit, Bash, Glob
---
[Agent system prompt content]
```
### Location
- Personal: `~/.claude/agents/`
- Plugin: `<plugin-root>/agents/`
- Project: `.claude/agents/`
## YAML Frontmatter Fields
### Required Fields
**`name`** (string, kebab-case)
- Unique identifier for the agent
- Used in Task tool invocations
- Example: `ios-swift-expert`, `technical-writer`
**`description`** (string)
- Clear explanation of what the agent does
- Should include usage examples wrapped in `<example>` tags
- Visible to users when selecting agents
- Example:
```yaml
description: Expert in Python linting and code quality analysis. Use when reviewing Python code for style violations, potential bugs, or best practice violations. Examples: <example>user: "Review my Python code for linting issues" assistant: "Let me use the python-linter agent to analyze your code for quality issues" <commentary>Python linting requires knowledge of PEP 8 and common Python anti-patterns.</commentary></example>
```
### Optional Fields
**`model`** (string)
- Specifies which model to use
- Use `inherit` to use the same model as the parent session
- Default: `inherit`
- Other options: specific model identifiers (use sparingly)
**`color`** (string)
- Display color in the UI
- Options: `blue`, `green`, `yellow`, `red`, `purple`, `cyan`, `magenta`
- Default: system default
**`tools`** (comma-separated list)
- Pre-approve specific tools for the agent
- Common tools: `Read`, `Write`, `Edit`, `Bash`, `Glob`, `Grep`, `WebFetch`
- Restricts agent to only listed tools (improves focus and safety)
- Example: `tools: Read, Write, Edit`
## System Prompt Best Practices
### Structure
1. **Identity Statement**: Clearly state what the agent is
```markdown
You are an expert in iOS and macOS development with deep knowledge of Swift, SwiftUI, UIKit, and Apple frameworks.
```
2. **Expertise Areas**: List specific capabilities
```markdown
## Your Expertise
You specialize in:
- Swift language features and best practices
- SwiftUI declarative interface design
- UIKit view hierarchies and lifecycle
```
3. **Workflow Guidance**: Provide step-by-step processes
```markdown
## Workflow
When implementing features:
1. Analyze requirements
2. Design data models
3. Create views
4. Test functionality
```
4. **Reference Resources**: Link to documentation
```markdown
## Documentation References
- Apple Developer: https://developer.apple.com/documentation/
- Swift.org: https://swift.org/documentation/
```
5. **Success Criteria**: Define what good looks like
```markdown
## Success Criteria
Your code is successful when:
- It compiles without warnings
- It follows Swift API design guidelines
- It handles errors appropriately
```
### Writing Effective Prompts
**Do:**
- Be specific about the agent's expertise boundaries
- Include concrete examples of when to use the agent
- Provide step-by-step workflows for common tasks
- Reference authoritative documentation
- Define clear success criteria
**Don't:**
- Make the agent too general-purpose
- Include tasks better suited for skills or commands
- Duplicate main Claude Code capabilities
- Create overly complex nested workflows
## Naming Conventions
- Use **kebab-case** for agent names
- Be descriptive but concise
- Indicate domain or specialty
- Examples:
- `ios-swift-expert`
- `technical-writer`
- `cli-ux-designer`
- `yaml-recipe-expert`
## Testing Your Subagent
1. **Invoke with Task tool**:
```
Use the Task tool with subagent_type="your-agent-name"
```
2. **Verify behavior**:
- Does it stay focused on its domain?
- Does it follow the workflow you defined?
- Does it have appropriate tool access?
3. **Iterate**:
- Refine system prompt based on actual usage
- Adjust tool preapprovals as needed
- Update examples in description
## Common Patterns
### Domain Expert Pattern
```markdown
---
name: domain-expert
description: Expert in specific technology or domain
model: inherit
color: blue
tools: Read, Write, Edit, Bash
---
You are an expert in [specific domain].
## Your Expertise
[List specific capabilities]
## Workflow
[Define standard processes]
## Best Practices
[Domain-specific guidelines]
```
### Workflow Automation Pattern
```markdown
---
name: workflow-automator
description: Automates specific multi-step workflows
model: inherit
color: green
tools: Read, Write, Edit, Bash, Grep, Glob
---
You automate [specific workflow].
## Workflow Steps
1. [Step 1]
2. [Step 2]
3. [Step 3]
## Tool Usage
[How to use preapproved tools]
## Success Criteria
[What constitutes successful completion]
```
## Integration with Plugins
When creating subagents as part of plugins:
1. Place in `agents/` subdirectory of plugin
2. Register in `.claude-plugin/marketplace.json`:
```json
{
"agents": {
"agent-name": "./agents/agent-name.md"
}
}
```
3. Document in plugin README.md
4. Consider whether a **skill** might be more appropriate (skills auto-activate based on context)
## Subagents vs Skills vs Commands
**Use Subagents when:**
- You need context isolation
- Workflow is delegatable and self-contained
- You want explicit invocation control
- Agent requires specialized model or tools
**Use Skills when:**
- You want automatic activation based on context
- Guidance should always be available
- Users shouldn't need to remember to invoke it
- Example: Code formatting rules, design patterns
**Use Commands when:**
- Workflow is simple and linear
- You want a quick shortcut
- No complex decision-making needed
- Example: Run tests, format code
## Example: Complete Subagent
```markdown
---
name: api-designer
description: Expert API designer specializing in RESTful and GraphQL APIs. Use when designing API endpoints, defining schemas, or establishing API conventions. Examples: <example>user: "Help me design a REST API for user management" assistant: "Let me use the api-designer agent to create a well-structured API" <commentary>API design requires expertise in REST principles and best practices.</commentary></example>
model: inherit
color: cyan
tools: Read, Write, Edit
---
You are an expert API designer with deep knowledge of REST, GraphQL, OpenAPI, and API best practices.
## Your Expertise
You specialize in:
- RESTful API design following Richardson Maturity Model
- GraphQL schema design and query optimization
- OpenAPI/Swagger specification authoring
- API versioning strategies
- Authentication and authorization patterns (OAuth 2.0, JWT, API keys)
- Rate limiting and pagination patterns
- Error response design
- API documentation
## Workflow
When designing APIs:
1. **Understand Requirements**
- Identify resources and relationships
- Determine access patterns
- Consider scalability needs
2. **Choose Architecture**
- REST for resource-oriented APIs
- GraphQL for flexible data fetching
- Consider hybrid approaches
3. **Design Endpoints/Schema**
- Follow naming conventions
- Use appropriate HTTP methods
- Design consistent response formats
- Handle errors gracefully
4. **Document**
- Create OpenAPI specification (REST)
- Generate schema documentation (GraphQL)
- Provide usage examples
- Document authentication
## Best Practices
### REST APIs
- Use nouns for resources, not verbs
- Leverage HTTP methods (GET, POST, PUT, PATCH, DELETE)
- Version using URL path (`/v1/users`) or headers
- Return appropriate status codes
- Use HATEOAS for discoverability (Level 3 maturity)
### GraphQL APIs
- Design schema-first
- Use meaningful type names
- Implement proper error handling
- Optimize for N+1 query problem
- Provide pagination using cursor-based approach
### Common Patterns
- Use UUIDs for public IDs
- Implement request/response logging
- Support filtering, sorting, pagination
- Include rate limit headers
- Use JSON:API or HAL for hypermedia
## Reference Documentation
- REST: https://restfulapi.net/
- GraphQL: https://graphql.org/learn/
- OpenAPI: https://swagger.io/specification/
- HTTP Status Codes: https://httpstatuses.com/
## Success Criteria
Your API design is successful when:
- It follows industry standards and conventions
- Resources and endpoints are intuitive
- Error handling is comprehensive and clear
- Documentation enables easy integration
- Design scales with usage growth
```

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#!/usr/bin/env python3
"""
Plugin Scaffold Generator for Claude Code
Creates a complete plugin directory structure with skeleton files.
Usage:
python init_plugin.py [--name NAME] [--description DESC] [--author AUTHOR] [--output DIR]
Example:
python init_plugin.py --name my-plugin --description "My plugin description" --author "Your Name"
"""
import argparse
import json
import os
import sys
from pathlib import Path
from typing import Optional
def create_directory_structure(
plugin_name: str,
description: str,
author: str,
output_dir: Optional[str] = None
) -> Path:
"""
Create plugin directory structure with all necessary files.
Args:
plugin_name: Name of the plugin (kebab-case)
description: Plugin description
author: Plugin author name
output_dir: Optional output directory (defaults to current directory)
Returns:
Path to created plugin directory
"""
# Determine base directory
base_dir = Path(output_dir) if output_dir else Path.cwd()
plugin_dir = base_dir / plugin_name
# Check if directory already exists
if plugin_dir.exists():
print(f"Error: Directory '{plugin_dir}' already exists", file=sys.stderr)
sys.exit(1)
# Create directory structure
plugin_dir.mkdir(parents=True)
(plugin_dir / ".claude-plugin").mkdir()
(plugin_dir / "agents").mkdir()
(plugin_dir / "commands").mkdir()
(plugin_dir / "skills").mkdir()
print(f"Created plugin directory: {plugin_dir}")
# Create plugin.json
plugin_json = {
"name": plugin_name,
"version": "0.1.0",
"description": description,
"author": author,
"agents": [],
"commands": [],
"skills": []
}
plugin_json_path = plugin_dir / ".claude-plugin" / "plugin.json"
with open(plugin_json_path, "w") as f:
json.dump(plugin_json, f, indent=2)
print(f"Created: {plugin_json_path}")
# Create README.md
readme_content = f"""# {plugin_name}
{description}
## Components
This plugin includes:
- **Agents**: [List agents here]
- **Commands**: [List commands here]
- **Skills**: [List skills here]
## Installation
Add this plugin to Claude Code:
```bash
/plugin install {plugin_name}@your-marketplace
```
## Usage
[Describe how to use the plugin components]
## Author
{author}
## Version
0.1.0
"""
readme_path = plugin_dir / "README.md"
with open(readme_path, "w") as f:
f.write(readme_content)
print(f"Created: {readme_path}")
# Create SKILLS.md
skills_content = f"""# {plugin_name} Skills
This document describes the skills provided by the {plugin_name} plugin.
## Skills
### skill-name
**File**: `skills/skill-name/SKILL.md`
**Description**: [Describe what this skill does and when it activates]
**Triggers**: [List activation triggers]
**Usage**: [Provide usage examples]
---
## Reference Materials
[List any reference materials or documentation included with the skills]
"""
skills_path = plugin_dir / "SKILLS.md"
with open(skills_path, "w") as f:
f.write(skills_content)
print(f"Created: {skills_path}")
# Create placeholder files
agent_placeholder = plugin_dir / "agents" / ".gitkeep"
agent_placeholder.touch()
command_placeholder = plugin_dir / "commands" / ".gitkeep"
command_placeholder.touch()
skill_placeholder = plugin_dir / "skills" / ".gitkeep"
skill_placeholder.touch()
print(f"\nPlugin scaffold created successfully!")
print(f"\nNext steps:")
print(f"1. Edit {plugin_json_path} to add component references")
print(f"2. Create agents in {plugin_dir / 'agents'}/")
print(f"3. Create commands in {plugin_dir / 'commands'}/")
print(f"4. Create skills in {plugin_dir / 'skills'}/")
print(f"5. Update README.md and SKILLS.md with actual documentation")
return plugin_dir
def validate_plugin_name(name: str) -> bool:
"""Validate plugin name follows kebab-case convention."""
if not name:
return False
if not all(c.islower() or c.isdigit() or c == '-' for c in name):
return False
if name.startswith('-') or name.endswith('-'):
return False
if '--' in name:
return False
return True
def main():
parser = argparse.ArgumentParser(
description="Create a new Claude Code plugin scaffold",
formatter_class=argparse.RawDescriptionHelpFormatter,
epilog="""
Examples:
python init_plugin.py --name my-plugin --description "My awesome plugin"
python init_plugin.py --name my-plugin --author "John Doe" --output ./plugins
"""
)
parser.add_argument(
"--name",
required=True,
help="Plugin name (kebab-case, e.g., 'my-plugin')"
)
parser.add_argument(
"--description",
default="A Claude Code plugin",
help="Plugin description"
)
parser.add_argument(
"--author",
default="Unknown",
help="Plugin author name"
)
parser.add_argument(
"--output",
help="Output directory (defaults to current directory)"
)
args = parser.parse_args()
# Validate plugin name
if not validate_plugin_name(args.name):
print(
f"Error: Plugin name '{args.name}' is invalid. "
"Use kebab-case (lowercase letters, numbers, and hyphens only)",
file=sys.stderr
)
sys.exit(1)
# Create plugin scaffold
create_directory_structure(
plugin_name=args.name,
description=args.description,
author=args.author,
output_dir=args.output
)
if __name__ == "__main__":
main()

387
skills/builder/scripts/validate_marketplace.py Normal file
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#!/usr/bin/env python3
"""
Marketplace Configuration Validator for Claude Code
Validates marketplace.json files for correctness and best practices.
Usage:
python validate_marketplace.py [marketplace.json]
Example:
python validate_marketplace.py .claude-plugin/marketplace.json
"""
import argparse
import json
import sys
from pathlib import Path
from typing import Any, Dict, List, Tuple
class ValidationError:
"""Represents a validation error or warning."""
def __init__(self, level: str, path: str, message: str):
self.level = level # 'error' or 'warning'
self.path = path
self.message = message
def __str__(self):
icon = "❌" if self.level == "error" else "⚠️"
return f"{icon} {self.level.upper()}: {self.path}: {self.message}"
class MarketplaceValidator:
"""Validates Claude Code marketplace.json files."""
def __init__(self, marketplace_path: Path):
self.marketplace_path = marketplace_path
self.base_dir = marketplace_path.parent.parent
self.errors: List[ValidationError] = []
self.warnings: List[ValidationError] = []
self.data: Dict[str, Any] = {}
def validate(self) -> bool:
"""
Perform all validation checks.
Returns:
True if validation passes (no errors), False otherwise
"""
if not self._load_json():
return False
self._validate_structure()
self._validate_plugins()
return len(self.errors) == 0
def _load_json(self) -> bool:
"""Load and parse the JSON file."""
try:
with open(self.marketplace_path, "r") as f:
self.data = json.load(f)
return True
except FileNotFoundError:
self.errors.append(
ValidationError("error", str(self.marketplace_path), "File not found")
)
return False
except json.JSONDecodeError as e:
self.errors.append(
ValidationError(
"error",
str(self.marketplace_path),
f"Invalid JSON: {e}"
)
)
return False
def _validate_structure(self):
"""Validate top-level marketplace structure."""
# Check for required field
if "plugins" not in self.data:
self.errors.append(
ValidationError(
"error",
"marketplace.json",
"Missing required field 'plugins'"
)
)
return
if not isinstance(self.data["plugins"], list):
self.errors.append(
ValidationError(
"error",
"marketplace.json",
"'plugins' must be an array"
)
)
# Check for optional pluginRoot
if "pluginRoot" in self.data:
plugin_root = self.data["pluginRoot"]
if not isinstance(plugin_root, str):
self.errors.append(
ValidationError(
"error",
"pluginRoot",
"Must be a string"
)
)
elif not plugin_root.startswith("./"):
self.warnings.append(
ValidationError(
"warning",
"pluginRoot",
"Should start with './' for relative paths"
)
)
def _validate_plugins(self):
"""Validate each plugin entry."""
if "plugins" not in self.data or not isinstance(self.data["plugins"], list):
return
plugin_names = set()
for idx, plugin in enumerate(self.data["plugins"]):
path_prefix = f"plugins[{idx}]"
if not isinstance(plugin, dict):
self.errors.append(
ValidationError(
"error",
path_prefix,
"Plugin entry must be an object"
)
)
continue
# Validate required fields
if "name" not in plugin:
self.errors.append(
ValidationError(
"error",
f"{path_prefix}",
"Missing required field 'name'"
)
)
else:
name = plugin["name"]
# Check for duplicate names
if name in plugin_names:
self.errors.append(
ValidationError(
"error",
f"{path_prefix}.name",
f"Duplicate plugin name '{name}'"
)
)
plugin_names.add(name)
# Validate name format
if not self._is_valid_kebab_case(name):
self.warnings.append(
ValidationError(
"warning",
f"{path_prefix}.name",
f"Plugin name '{name}' should use kebab-case"
)
)
if "source" not in plugin:
self.errors.append(
ValidationError(
"error",
f"{path_prefix}",
"Missing required field 'source'"
)
)
else:
self._validate_source_path(plugin["source"], path_prefix)
# Validate optional fields
if "version" in plugin and not isinstance(plugin["version"], str):
self.errors.append(
ValidationError(
"error",
f"{path_prefix}.version",
"Version must be a string"
)
)
if "description" in plugin and not isinstance(plugin["description"], str):
self.errors.append(
ValidationError(
"error",
f"{path_prefix}.description",
"Description must be a string"
)
)
# Validate component arrays
for component_type in ["agents", "commands", "skills"]:
if component_type in plugin:
self._validate_component_array(
plugin[component_type],
f"{path_prefix}.{component_type}",
plugin.get("source", "")
)
def _validate_source_path(self, source: str, path_prefix: str):
"""Validate plugin source path."""
if not isinstance(source, str):
self.errors.append(
ValidationError(
"error",
f"{path_prefix}.source",
"Source must be a string"
)
)
return
# Check for relative path prefix
if not source.startswith("./"):
self.errors.append(
ValidationError(
"error",
f"{path_prefix}.source",
f"Source path '{source}' must start with './'"
)
)
# Check if directory exists
source_path = self.base_dir / source.lstrip("./")
if not source_path.exists():
self.errors.append(
ValidationError(
"error",
f"{path_prefix}.source",
f"Source directory '{source}' does not exist"
)
)
elif not source_path.is_dir():
self.errors.append(
ValidationError(
"error",
f"{path_prefix}.source",
f"Source path '{source}' is not a directory"
)
)
def _validate_component_array(
self,
components: Any,
path_prefix: str,
plugin_source: str
):
"""Validate component array (agents, commands, or skills)."""
if not isinstance(components, list):
self.errors.append(
ValidationError(
"error",
path_prefix,
"Component array must be an array"
)
)
return
component_type = path_prefix.split(".")[-1] # Extract 'agents', 'commands', etc.
for idx, component in enumerate(components):
comp_path = f"{path_prefix}[{idx}]"
if not isinstance(component, dict):
self.errors.append(
ValidationError(
"error",
comp_path,
"Component entry must be an object"
)
)
continue
# Validate required 'path' field
if "path" not in component:
self.errors.append(
ValidationError(
"error",
comp_path,
"Missing required field 'path'"
)
)
else:
comp_file_path = component["path"]
if not isinstance(comp_file_path, str):
self.errors.append(
ValidationError(
"error",
f"{comp_path}.path",
"Path must be a string"
)
)
else:
# Resolve full path
if plugin_source:
full_path = self.base_dir / plugin_source.lstrip("./") / comp_file_path
if not full_path.exists():
self.errors.append(
ValidationError(
"error",
f"{comp_path}.path",
f"Component file '{comp_file_path}' does not exist at '{full_path}'"
)
)
@staticmethod
def _is_valid_kebab_case(name: str) -> bool:
"""Check if string follows kebab-case convention."""
if not name:
return False
if not all(c.islower() or c.isdigit() or c == '-' for c in name):
return False
if name.startswith('-') or name.endswith('-'):
return False
if '--' in name:
return False
return True
def print_report(self):
"""Print validation report."""
if self.errors:
print("\n🔴 ERRORS:")
for error in self.errors:
print(f" {error}")
if self.warnings:
print("\n⚠️ WARNINGS:")
for warning in self.warnings:
print(f" {warning}")
print("\n" + "=" * 60)
if self.errors:
print(f"❌ Validation FAILED: {len(self.errors)} error(s), {len(self.warnings)} warning(s)")
elif self.warnings:
print(f"✅ Validation PASSED with {len(self.warnings)} warning(s)")
else:
print("✅ Validation PASSED: No errors or warnings")
print("=" * 60)
def main():
parser = argparse.ArgumentParser(
description="Validate Claude Code marketplace.json files",
formatter_class=argparse.RawDescriptionHelpFormatter,
epilog="""
Examples:
python validate_marketplace.py .claude-plugin/marketplace.json
python validate_marketplace.py /path/to/marketplace.json
"""
)
parser.add_argument(
"marketplace_file",
nargs="?",
default=".claude-plugin/marketplace.json",
help="Path to marketplace.json file (default: .claude-plugin/marketplace.json)"
)
args = parser.parse_args()
marketplace_path = Path(args.marketplace_file)
print(f"Validating: {marketplace_path}")
print("=" * 60)
validator = MarketplaceValidator(marketplace_path)
success = validator.validate()
validator.print_report()
sys.exit(0 if success else 1)
if __name__ == "__main__":
main()