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+---
+name: agent-identifier
+description: Use when creating or configuring Claude Code agents and their frontmatter.
+version: 0.1.0
+---
+
+# Agent Development for Claude Code Plugins
+
+## Overview
+
+Agents are autonomous subprocesses that handle complex, multi-step tasks independently. Understanding agent structure, triggering conditions, and system prompt design enables creating powerful autonomous capabilities.
+
+**Key concepts:**
+- Agents are FOR autonomous work, commands are FOR user-initiated actions
+- Markdown file format with YAML frontmatter
+- Triggering via description field with examples
+- System prompt defines agent behavior
+- Model and color customization
+
+## When to Use
+
+Use this skill when the user asks to:
+- Create an agent
+- Add an agent
+- Write a subagent
+- Define agent frontmatter
+- Decide when to use description examples
+- Configure agent tools, colors, or model behavior
+- Design autonomous agent structure, triggering conditions, or system prompts
+
+## When Not to Use
+
+Do not use this skill for:
+- Slash command design
+- Hook configuration
+- MCP server setup
+- General plugin layout questions that belong to `plugin-structure`
+
+## Agent File Structure
+
+### Complete Format
+
+```markdown
+---
+name: agent-identifier
+description: Use this agent when [triggering conditions]. Examples:
+
+<example>
+Context: [Situation description]
+user: "[User request]"
+assistant: "[How assistant should respond and use this agent]"
+<commentary>
+[Why this agent should be triggered]
+</commentary>
+</example>
+
+<example>
+[Additional example...]
+</example>
+
+model: inherit
+color: blue
+tools: ["Read", "Write", "Grep"]
+---
+
+You are [agent role description]...
+
+**Your Core Responsibilities:**
+1. [Responsibility 1]
+2. [Responsibility 2]
+
+**Analysis Process:**
+[Step-by-step workflow]
+
+**Output Format:**
+[What to return]
+```
+
+## Frontmatter Fields
+
+### name (required)
+
+Agent identifier used for namespacing and invocation.
+
+**Format:** lowercase, numbers, hyphens only
+**Length:** 3-50 characters
+**Pattern:** Must start and end with alphanumeric
+
+**Good examples:**
+- `code-reviewer`
+- `test-generator`
+- `api-docs-writer`
+- `security-analyzer`
+
+**Bad examples:**
+- `helper` (too generic)
+- `-agent-` (starts/ends with hyphen)
+- `my_agent` (underscores not allowed)
+- `ag` (too short, < 3 chars)
+
+### description (required)
+
+Defines when Claude should trigger this agent. **This is the most critical field.**
+
+**Must include:**
+1. Triggering conditions ("Use this agent when...")
+2. Multiple `<example>` blocks showing usage
+3. Context, user request, and assistant response in each example
+4. `<commentary>` explaining why agent triggers
+
+**Format:**
+```
+Use this agent when [conditions]. Examples:
+
+<example>
+Context: [Scenario description]
+user: "[What user says]"
+assistant: "[How Claude should respond]"
+<commentary>
+[Why this agent is appropriate]
+</commentary>
+</example>
+
+[More examples...]
+```
+
+**Best practices:**
+- Include 2-4 concrete examples
+- Show proactive and reactive triggering
+- Cover different phrasings of same intent
+- Explain reasoning in commentary
+- Be specific about when NOT to use the agent
+
+### model (required)
+
+Which model the agent should use.
+
+**Options:**
+- `inherit` - Use same model as parent (recommended)
+- `sonnet` - Claude Sonnet (balanced)
+- `opus` - Claude Opus (most capable, expensive)
+- `haiku` - Claude Haiku (fast, cheap)
+
+**Recommendation:** Use `inherit` unless agent needs specific model capabilities.
+
+### color (required)
+
+Visual identifier for agent in UI.
+
+**Options:** `blue`, `cyan`, `green`, `yellow`, `magenta`, `red`
+
+**Guidelines:**
+- Choose distinct colors for different agents in same plugin
+- Use consistent colors for similar agent types
+- Blue/cyan: Analysis, review
+- Green: Success-oriented tasks
+- Yellow: Caution, validation
+- Red: Critical, security
+- Magenta: Creative, generation
+
+### tools (optional)
+
+Restrict agent to specific tools.
+
+**Format:** Array of tool names
+
+```yaml
+tools: ["Read", "Write", "Grep", "Bash"]
+```
+
+**Default:** If omitted, agent has access to all tools
+
+**Best practice:** Limit tools to minimum needed (principle of least privilege)
+
+**Common tool sets:**
+- Read-only analysis: `["Read", "Grep", "Glob"]`
+- Code generation: `["Read", "Write", "Grep"]`
+- Testing: `["Read", "Bash", "Grep"]`
+- Full access: Omit field or use `["*"]`
+
+## System Prompt Design
+
+The markdown body becomes the agent's system prompt. Write in second person, addressing the agent directly.
+
+### Structure
+
+**Standard template:**
+```markdown
+You are [role] specializing in [domain].
+
+**Your Core Responsibilities:**
+1. [Primary responsibility]
+2. [Secondary responsibility]
+3. [Additional responsibilities...]
+
+**Analysis Process:**
+1. [Step one]
+2. [Step two]
+3. [Step three]
+[...]
+
+**Quality Standards:**
+- [Standard 1]
+- [Standard 2]
+
+**Output Format:**
+Provide results in this format:
+- [What to include]
+- [How to structure]
+
+**Edge Cases:**
+Handle these situations:
+- [Edge case 1]: [How to handle]
+- [Edge case 2]: [How to handle]
+```
+
+### Best Practices
+
+✅ **DO:**
+- Write in second person ("You are...", "You will...")
+- Be specific about responsibilities
+- Provide step-by-step process
+- Define output format
+- Include quality standards
+- Address edge cases
+- Keep under 10,000 characters
+
+❌ **DON'T:**
+- Write in first person ("I am...", "I will...")
+- Be vague or generic
+- Omit process steps
+- Leave output format undefined
+- Skip quality guidance
+- Ignore error cases
+
+## Creating Agents
+
+### Method 1: AI-Assisted Generation
+
+Use this prompt pattern (extracted from Claude Code):
+
+```
+Create an agent configuration based on this request: "[YOUR DESCRIPTION]"
+
+Requirements:
+1. Extract core intent and responsibilities
+2. Design expert persona for the domain
+3. Create comprehensive system prompt with:
+   - Clear behavioral boundaries
+   - Specific methodologies
+   - Edge case handling
+   - Output format
+4. Create identifier (lowercase, hyphens, 3-50 chars)
+5. Write description with triggering conditions
+6. Include 2-3 <example> blocks showing when to use
+
+Return JSON with:
+{
+  "identifier": "agent-name",
+  "whenToUse": "Use this agent when... Examples: <example>...</example>",
+  "systemPrompt": "You are..."
+}
+```
+
+Then convert to agent file format with frontmatter.
+
+See `examples/agent-creation-prompt.md` for complete template.
+
+### Method 2: Manual Creation
+
+1. Choose agent identifier (3-50 chars, lowercase, hyphens)
+2. Write description with examples
+3. Select model (usually `inherit`)
+4. Choose color for visual identification
+5. Define tools (if restricting access)
+6. Write system prompt with structure above
+7. Save as `agents/agent-name.md`
+
+## Validation Rules
+
+### Identifier Validation
+
+```
+✅ Valid: code-reviewer, test-gen, api-analyzer-v2
+❌ Invalid: ag (too short), -start (starts with hyphen), my_agent (underscore)
+```
+
+**Rules:**
+- 3-50 characters
+- Lowercase letters, numbers, hyphens only
+- Must start and end with alphanumeric
+- No underscores, spaces, or special characters
+
+### Description Validation
+
+**Length:** 10-5,000 characters
+**Must include:** Triggering conditions and examples
+**Best:** 200-1,000 characters with 2-4 examples
+
+### System Prompt Validation
+
+**Length:** 20-10,000 characters
+**Best:** 500-3,000 characters
+**Structure:** Clear responsibilities, process, output format
+
+## Agent Organization
+
+### Plugin Agents Directory
+
+```
+plugin-name/
+└── agents/
+    ├── analyzer.md
+    ├── reviewer.md
+    └── generator.md
+```
+
+All `.md` files in `agents/` are auto-discovered.
+
+### Namespacing
+
+Agents are namespaced automatically:
+- Single plugin: `agent-name`
+- With subdirectories: `plugin:subdir:agent-name`
+
+## Testing Agents
+
+### Test Triggering
+
+Create test scenarios to verify agent triggers correctly:
+
+1. Write agent with specific triggering examples
+2. Use similar phrasing to examples in test
+3. Check Claude loads the agent
+4. Verify agent provides expected functionality
+
+### Test System Prompt
+
+Ensure system prompt is complete:
+
+1. Give agent typical task
+2. Check it follows process steps
+3. Verify output format is correct
+4. Test edge cases mentioned in prompt
+5. Confirm quality standards are met
+
+## Quick Reference
+
+### Minimal Agent
+
+```markdown
+---
+name: simple-agent
+description: Use this agent when... Examples: <example>...</example>
+model: inherit
+color: blue
+---
+
+You are an agent that [does X].
+
+Process:
+1. [Step 1]
+2. [Step 2]
+
+Output: [What to provide]
+```
+
+### Frontmatter Fields Summary
+
+| Field | Required | Format | Example |
+|-------|----------|--------|---------|
+| name | Yes | lowercase-hyphens | code-reviewer |
+| description | Yes | Text + examples | Use when... <example>... |
+| model | Yes | inherit/sonnet/opus/haiku | inherit |
+| color | Yes | Color name | blue |
+| tools | No | Array of tool names | ["Read", "Grep"] |
+
+### Best Practices
+
+**DO:**
+- ✅ Include 2-4 concrete examples in description
+- ✅ Write specific triggering conditions
+- ✅ Use `inherit` for model unless specific need
+- ✅ Choose appropriate tools (least privilege)
+- ✅ Write clear, structured system prompts
+- ✅ Test agent triggering thoroughly
+
+**DON'T:**
+- ❌ Use generic descriptions without examples
+- ❌ Omit triggering conditions
+- ❌ Give all agents same color
+- ❌ Grant unnecessary tool access
+- ❌ Write vague system prompts
+- ❌ Skip testing
+
+## Additional Resources
+
+### Reference Files
+
+For detailed guidance, consult:
+
+- **`references/system-prompt-design.md`** - Complete system prompt patterns
+- **`references/triggering-examples.md`** - Example formats and best practices
+- **`references/agent-creation-system-prompt.md`** - The exact prompt from Claude Code
+
+### Example Files
+
+Working examples in `examples/`:
+
+- **`agent-creation-prompt.md`** - AI-assisted agent generation template
+- **`complete-agent-examples.md`** - Full agent examples for different use cases
+
+### Utility Scripts
+
+Development tools in `scripts/`:
+
+- **`validate-agent.sh`** - Validate agent file structure
+- **`test-agent-trigger.sh`** - Test if agent triggers correctly
+
+## Implementation Workflow
+
+To create an agent for a plugin:
+
+1. Define agent purpose and triggering conditions
+2. Choose creation method (AI-assisted or manual)
+3. Create `agents/agent-name.md` file
+4. Write frontmatter with all required fields
+5. Write system prompt following best practices
+6. Include 2-4 triggering examples in description
+7. Validate with `scripts/validate-agent.sh`
+8. Test triggering with real scenarios
+9. Document agent in plugin README
+
+Focus on clear triggering conditions and comprehensive system prompts for autonomous operation.