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packages/ai-copilot/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 - GITHUB COPILOT EXTENSION</h2>
+
+<hr />
+
+</div>
+
+## Description
+
+The `@theia/ai-copilot` extension integrates GitHub Copilot language models with Theia AI.
+This allows users to authenticate with their GitHub Copilot subscription and use Copilot models (e.g., GPT-4o, Claude Sonnet) through Theia's AI features.
+
+### Authentication
+
+The extension uses GitHub's OAuth Device Flow for authentication:
+
+1. Click the "Copilot" status bar item or run the **Copilot: Sign In** command
+2. A dialog appears with a device code - click the link to open GitHub's device authorization page
+3. Enter the code and authorize the application
+4. The dialog updates to show "Authenticated" and the status bar reflects the signed-in state
+
+Once authenticated, Copilot models become available in the AI Configuration for use with any Theia AI agent.
+
+> **Note:** This extension requires an active GitHub Copilot subscription.
+
+### Configuration
+
+Available models can be configured via the `ai-features.copilot.models` preference:
+
+```json
+{
+    "ai-features.copilot.models": [
+        "gpt-4o",
+        "claude-sonnet-4"
+    ]
+}
+```
+
+### GitHub Enterprise
+
+For GitHub Enterprise users, configure the enterprise URL via the `ai-features.copilot.enterpriseUrl` preference:
+
+```json
+{
+    "ai-features.copilot.enterpriseUrl": "github.mycompany.com"
+}
+```
+
+### Commands
+
+- **Copilot: Sign In** - Initiates the OAuth device flow authentication
+- **Copilot: Sign Out** - Signs out and clears stored credentials
+
+## Additional Information
+
+- [API documentation for `@theia/ai-copilot`](https://eclipse-theia.github.io/theia/docs/next/modules/_theia_ai-copilot.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>