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

# Skills

> Add reusable domain expertise and workflows to your experts with Skills.

Skills are reusable packages of instructions, files, and structured context that add domain expertise to an expert. Think of them as portable behavior modules you can share across multiple experts.

## Skills vs System Prompt

|                 | System Prompt                      | Skills                                          |
| --------------- | ---------------------------------- | ----------------------------------------------- |
| **Format**      | Inline text in the expert editor   | Versioned packages with files and instructions  |
| **Portability** | Tied to one expert                 | Shareable across experts                        |
| **Best for**    | Simple behavior rules, tone, style | Multi-file workflows, reusable domain knowledge |
| **Maintenance** | Edit per expert                    | Edit per expert                                 |

**When to use which:**

* **Skills**: Multi-file workflows, reusable behavior across experts, structured templates, domain knowledge bases.
* **System prompt**: Simple behavior rules, tone/style guidelines, single-expert customizations.

## The agentskills.io Marketplace

[agentskills.io](https://agentskills.io) is the community marketplace for skills. Browse and install skills built by other users, or publish your own for others to use.

## Attaching Skills to an Expert

When creating or editing an expert:

1. Navigate to the **Basics / Behavior** step.
2. In the **Skills** section, click to add a skill.
3. Search for or select the skill you want to attach.
4. Save the expert.

The skill's instructions and files become part of the expert's context whenever it runs.

## Next Steps

<CardGroup cols={2}>
  <Card title="Knowledge Base" icon="book" color="#007AFF" href="/experts/knowledge-base" arrow={true}>
    Connect a Google Drive folder as a knowledge source for your expert.
  </Card>

  <Card title="Creating an Expert" icon="plus" color="#34C759" href="/experts/creating-a-new-agent" arrow={true}>
    Build your first expert with skills attached.
  </Card>

  <Card title="Expert Fields Reference" icon="list-check" color="#FF9500" href="/experts/expert-fields-reference" arrow={true}>
    See all configuration options including skills.
  </Card>

  <Card title="Hives Reference" icon="cubes" color="#5856D6" href="/experts/hives-reference" arrow={true}>
    Learn about built-in tool bundles.
  </Card>
</CardGroup>