> ## Documentation Index
> Fetch the complete documentation index at: https://gnero.genetind.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Custom Skills

## Custom Skills

### 12.1 What is a Skill

| Concept           | Command                          | Agent                          | Skill                         |
| ----------------- | -------------------------------- | ------------------------------ | ----------------------------- |
| **Purpose**       | User-triggered specific workflow | System-invoked autonomous unit | Reusable AI capability module |
| **Trigger**       | `/xxx`                           | `Task(subagent_type)`          | Skill system auto-matches     |
| **Cross-project** | No                               | No                             | Yes (npm publish)             |
| **Granularity**   | Workflow-level                   | Role-level                     | Capability-level              |

### 12.2 SKILL.md File Format

Skill files are stored in the `.claude/skills/` or `.agents/skills/` directory:

```markdown theme={null}
# Skill Name

## Trigger

When the user asks to [describe trigger condition]...

## Instructions

[Detailed instructions for the AI]

## Tools Required

- Tool1
- Tool2

## Examples

### Example 1

User: "..."
AI: [Expected behavior]
```

### 12.3 Creating Skills with skill-creator

```
/create-command
# Select Skill type
```

Or use the skill-creator Skill directly:

```
I want to create a new Skill for auto-generating API documentation
```

### 12.4 Integrating External Skills

```
/integrate-skill
```

The AI will:

1. Identify the Skill source
2. Analyze the Skill's functionality
3. Create integration docs in `spec/guides/`
4. Create a wrapper command in `.claude/commands/trellis/`
5. Generate a unified `/use-[skill-name]` entry point

### 12.5 Sharing Skills

If you want to share a Skill, you can publish it via npm or share it directly on GitHub. Other users can integrate your Skill into their projects via the `/integrate-skill` command.

***