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theia-code-os/packages/ai-core/README.md
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<div align='center'>
<br />
<img src='https://raw.githubusercontent.com/eclipse-theia/theia/master/logo/theia.svg?sanitize=true' alt='theia-ext-logo' width='100px' />
<h2>ECLIPSE THEIA - AI CORE EXTENSION</h2>
<hr />
</div>
## Description
The `@theia/ai-core` extension serves as the basis of all AI integration in Theia.
It manages the integration of language models and provides core concepts like agents, prompts, AI variables, and skills.
### Skills
Skills provide reusable instructions and domain knowledge for AI agents. A skill is a directory containing a `SKILL.md` file with YAML frontmatter (name, description) and markdown content.
#### Skill Directories
Skills are discovered from multiple locations, processed in priority order (first wins on duplicates):
1. **Workspace:** `.prompts/skills/` in the workspace root (project-specific skills)
2. **User-configured:** Directories listed in `ai-features.skills.skillDirectories` preference
3. **Global:** `~/.theia/skills/` (user defaults)
#### Skill Structure
Each skill must be in its own directory with the directory name matching the skill name:
```text
skills/
├── my-skill/
│ └── SKILL.md
└── another-skill/
└── SKILL.md
```
#### Usage
- Add `{{skills}}` to an agent's prompt to inject available skills as XML (name and description)
- Agents can read full skill content using the `getSkillFileContent` tool with the skill name
Enablement of the Theia AI feature is managed via the AI preferences, contributed by `@theia/ai-core-ui`.
Either include `@theia/ai-core-ui` or bind the included preferences schemas in your Theia based application.
## Additional Information
- [API documentation for `@theia/ai-core`](https://eclipse-theia.github.io/theia/docs/next/modules/_theia_ai-core.html)
- [Theia - GitHub](https://github.com/eclipse-theia/theia)
- [Theia - Website](https://theia-ide.org/)
## License
- [Eclipse Public License 2.0](http://www.eclipse.org/legal/epl-2.0/)
- [一 (Secondary) GNU General Public License, version 2 with the GNU Classpath Exception](https://projects.eclipse.org/license/secondary-gpl-2.0-cp)
## Trademark
"Theia" is a trademark of the Eclipse Foundation
<https://www.eclipse.org/theia>