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CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+
+This is a JupyterLab extension package that provides default chat commands for Jupyter AI. It consists of:
+- A Python server extension (`jupyter_ai_chat_commands`)
+- A TypeScript frontend extension (`@jupyter-ai/chat-commands`)
+
+The extension currently provides two chat commands:
+- `@file:<path>`: Add a file as an attachment to a message
+- `/refresh-personas`: Reload local personas defined in `.jupyter/personas`
+
+## Development Setup
+
+Initial setup requires micromamba/conda and Node.js 22:
+```bash
+micromamba install uv jupyterlab nodejs=22
+jlpm
+jlpm dev:install
+```
+
+The `dev:install` script handles the complete development setup including building the extension, installing Python dependencies, and enabling the server extension.
+
+## Common Commands
+
+### Building
+- `jlpm build` - Build both TypeScript and labextension for development
+- `jlpm build:prod` - Production build with optimization
+- `jlpm build:lib` - Build TypeScript source with source maps
+- `jlpm build:labextension` - Build the JupyterLab extension
+
+### Development Workflow
+- `jlpm watch` - Watch mode for development (runs both TypeScript and labextension watch)
+- `jupyter lab` - Start JupyterLab (run in separate terminal alongside watch)
+
+### Linting and Testing
+- `jlpm lint` - Run all linters (stylelint, prettier, eslint)
+- `jlpm lint:check` - Check without fixing
+- `jlpm test` - Run Jest tests with coverage
+- `pytest -vv -r ap --cov jupyter_ai_chat_commands` - Run Python server tests
+
+### Extension Management
+- `jlpm dev:uninstall` - Remove development extension
+- `jupyter server extension list` - Check server extension status
+- `jupyter labextension list` - Check frontend extension status
+
+## Architecture
+
+### Frontend (TypeScript)
+- Entry point: `src/index.ts` - exports main plugin and chat command plugins
+- Chat commands: `src/chat-command-plugins/` contains individual command implementations
+- Uses JupyterLab 4.x plugin system and `@jupyter/chat` for chat integration
+
+### Backend (Python)
+- Server extension: `jupyter_ai_chat_commands/extension_app.py`
+- Request handlers: `jupyter_ai_chat_commands/handlers.py`
+- Depends on `jupyterlab_chat`, `jupyter_ai_router`, and `jupyter_ai_persona_manager`
+
+### Key Dependencies
+- Frontend: `@jupyter/chat`, `@jupyterlab/application`, Material-UI icons
+- Backend: `jupyter_server`, `jupyterlab_chat`, `jupyter_ai_router`
+
+## Code Style
+- TypeScript: ESLint with TypeScript rules, Prettier formatting, single quotes
+- Interface naming: Must start with 'I' and use PascalCase
+- CSS: Stylelint with standard config
+- Python: No specific linter configured (follows standard Python conventions)
+
+## Testing
+- Frontend: Jest with coverage reporting
+- Backend: Pytest with pytest-asyncio for server testing
+- Integration: Playwright tests in `ui-tests/` (currently skipped)
+
+Note: Integration tests are currently disabled - see recent commit "skip integration tests for now".