xtralab 0.4.0

An opinionated JupyterLab meta-package that bundles a curated set of extensions, ships a path-first file browser and a VS Code-style git changes panel, and applies a quieter default workspace configuration.

xtralab

An opinionated JupyterLab meta-package.

Bundles a curated set of extensions, a path-first file browser, a VS Code-style git changes panel, an agent-focused launcher, and a quieter default workspace.

Install

pip install xtralab

Usage

As a JupyterLab package

Run JupyterLab the usual way:

jupyter lab

As a desktop app

A standalone Electron build (DMG on macOS, AppImage on Linux) ships with each tagged release — grab the installer for your platform from the Releases page. Builds from the current main branch are also produced on every push as workflow artifacts under the repository's Actions tab. See CONTRIBUTING.md for the architecture and local build instructions.

What's included

• ajlab — agent-ready JupyterLab base
• JupyterLab 4.6+
• jupyterlab-git — backs the bundled changes panel
• jupyterlab-lsp + ty — Python LSP via Astral's ty (bundled); also detects typescript-language-server on PATH for JS/TS
• jupyterlab-quickopen
• jupyterlab-cursor-light, jupyterlab-cursor-dark
• jupyterlab-day, jupyterlab-night themes

The bundled labextension adds:

• A path-first file browser in the left sidebar.
• A "Source Control" panel powered by jupyterlab-git and @pierre/diffs.
• An agent launcher with a prompt textarea, a row of agent buttons (Claude, Codex, Gemini, Copilot, Goose, OpenCode, Kiro, Mistral Vibe), and a collapsible list of changed files. Buttons are filtered to agents installed on the machine; a typed prompt is shell-quoted and spliced into the launch command for agents that accept one.

Language servers

xtralab ships with jupyterlab-lsp and pre-registers two language servers through jupyter_server_config.d/xtralab-lsp.json:

• Python — ty — installed as a Python dependency. Works out of the box.

• TypeScript / JavaScript — typescript-language-server — install yourself:

  npm install -g typescript-language-server typescript
  

  Restart JupyterLab (or the desktop app) after installing.

Specs use bare command names (["ty", "server"]), so binaries are resolved from PATH at spawn time.

Where binaries are discovered

• pip install xtralab — anything on the JupyterLab process's PATH.
• Desktop app — the supervisor augments PATH with common shim locations (~/.volta/bin, ~/.npm-global/bin, ~/.bun/bin, ~/.asdf/shims, ~/.mise/shims, /opt/homebrew/bin, /usr/local/bin, …). Set XTRALAB_EXTRA_PATH (colon-separated) before launching the app to add directories the defaults miss.

Adding more servers

To enable another server (bash, yaml, json, dockerfile, pyright, …), install the binary then drop a JSON file into a jupyter_server_config.d/ directory:

• pip install xtralab — run jupyter --paths and pick a config dir (typically ~/.jupyter/jupyter_server_config.d/).
• Desktop app (macOS) — ~/Library/Application Support/xtralab/jupyter/config/jupyter_server_config.d/ (or xtralab dev for local dev builds).
• Desktop app (Linux AppImage) — ~/.config/xtralab/jupyter/config/jupyter_server_config.d/.

Example (bash-lsp.json):

{
  "LanguageServerManager": {
    "language_servers": {
      "bash-language-server": {
        "version": 2,
        "argv": ["bash-language-server", "start"],
        "languages": ["bash", "sh"],
        "mime_types": ["text/x-sh", "application/x-sh"],
        "display_name": "bash-language-server"
      }
    }
  }
}

Pair with npm install -g bash-language-server. Reuse a bundled key to override it. See jupyterlab-lsp's docs for the full spec schema.

Customizing the launcher

Open Settings → Settings Editor → xtralab launcher and edit the agents array. Entries are merged with the defaults by id.

{
  "agents": [
    // Hide an agent
    { "id": "kiro", "enabled": false },

    // Override an agent's command (e.g. point Claude at a shell alias)
    { "id": "claude", "command": "cl", "requireAvailable": false },

    // Add a new agent; promptArgs: [] appends the prompt as a positional arg
    { "id": "aider", "label": "Aider", "command": "aider", "promptArgs": [] }
  ]
}

Fields: id (required), label, caption, command, promptArgs (how to splice the prompt — [] for positional, ["--flag"] for flagged, null to opt out), iconSvg, rank, enabled, requireAvailable.

Contributing

See CONTRIBUTING.md for the development setup, the Electron desktop app architecture, and the build pipeline.

License

BSD-3-Clause