Alto Connector

mcp-name: io.github.lukebmandel-debug/alto-connector

A Claude connector that interviews you about your own materials — a course, a novel, a research project — and builds you an interactive, filterable "liquid-glass" Alto timeline: glass cards on colored act bands, entity chips, routed connection lines, detail pages with your own schema, highlights and notes, mobile layout, and a self-contained offline file you can share.

The one rule (§0): Alto is a closed knowledge container. It connects and organizes what you provide — it never invents facts, events, holdings, or descriptions. Sparse notes make a sparse timeline, on purpose. The connector enforces this server-side: authoring tools stay locked until your materials and explicit consent are recorded.

Install

Download the file for your computer from the latest release, then in Claude Desktop go to Settings → Extensions → Advanced settings → Install Extension… and choose it. Restart Claude Desktop and Alto appears under Extensions.

macOS, Apple Silicon	Alto-macos-arm64.mcpb
macOS, Intel	Alto-macos-x64.mcpb
Windows, 64-bit	Alto-windows-x64.mcpb

Nothing else to install. Each bundle carries its own Python, which is why it is around 50MB. Claude Desktop ships Node but not Python, and stock macOS still has 3.9 — too old for this server.

Without Claude Desktop

Alto is a plain MCP server, so any MCP client can run it — Claude Code, Cline, Zed, Continue, your own script. No download, no bundle.

Add this to your client's MCP config:

{
  "mcpServers": {
    "alto": {
      "command": "uvx",
      "args": ["--from",
               "git+https://github.com/lukebmandel-debug/alto-connector",
               "alto-connector"]
    }
  }
}

Requires uv (curl -LsSf https://astral.sh/uv/install.sh | sh). uvx fetches and runs Alto in a throwaway environment each time, so there is nothing to install or update.

Prefer a permanent install? Then alto-connector is on your PATH and the config is simply {"command": "alto-connector"}:

pip install git+https://github.com/lukebmandel-debug/alto-connector
alto-connector --help      # check it works; without --help it waits for a
                           # client to speak to it, which looks like a hang

Everything works the same way — the interview, the build, the offline file — because the bundle and this are the same server; the bundle just carries its own Python so Claude Desktop users need not install one.

Timelines land in ~/Documents/Alto. Each is a single self-contained HTML file you open in any browser — no server, no account, no internet. Shareable web links are optional (see Publishing below); without them, that file is the finished product.

Then tell your client: "I want to build a timeline in Alto — interview me."

From a checkout

bash setup.sh — macOS and Claude Desktop only; it registers the connector by writing claude_desktop_config.json. For any other client, use one of the two methods above pointed at your checkout.

Using it — what a new user actually does

1. Open a chat and say something like "I want to build a timeline in Alto — interview me."
2. Claude calls get_interview_guide and runs a short warm interview:
   • Flow 1 — name the project container and what it's for.
   • Flow 2 §A — the materials gate: you hand over your actual materials (upload files or paste text into the chat), and explicitly agree that Alto builds only from them.
   • §B–§I — title, what the axis means, your acts/eras, your entities (characters, doctrines, teams…), node schema (e.g. Facts·Issue·Holding· Rule for law), relationship vocabulary for the lines, extra filter axes, persona, presentation.
3. Claude authors nodes verbatim from your materials, wires connections, runs a layout preview, builds (a verifier gates every build), and publishes.
4. You get your timeline two ways:
   • Offline file (always): one self-contained HTML — double-click to open, send to a friend, works forever with no server.
   • Web links (optional, still free): if Firebase publishing is configured, https://<your-site>.web.app/t/<timeline>/ plus a homepage listing all your published timelines, a reports page, and cross-device sync of highlights/notes/reports.
5. Come back any time — drafts resume across chats via get_timeline.

Publishing (optional web links + cross-device sync)

Timelines are private by default and the offline file always works. To publish shareable links — and to get highlights, notes and reports syncing between your desktop and your phone — you host them on your own free Firebase project (Spark plan, no card).

You host what you share. Everyone who authors a timeline publishes to their own project, so the people you send a link to read it from your site and their notes live in your Firestore. That means you can revoke a link at any time (publish_timeline(timeline_id, visibility="private") deletes the page from your site), and it means nobody's data flows through anyone else's project. Reading a shared timeline needs no install and no Alto account — just the link.

1. console.firebase.google.com → create a project → Hosting → add a site (e.g. my-alto).

2. Enable Firestore and Authentication → Google in that project, and deploy the per-user rules in firestore.rules (firebase deploy --only firestore:rules). Do this before publishing: a Firestore left in test mode is world-readable and world-writable for 30 days.

3. npm i -g firebase-tools && firebase login

4. Open Alto's settings in Claude Desktop (Settings → Extensions → Alto) and fill in Firebase Hosting site, Firebase project id and Firebase web config. From a checkout instead, set ALTO_FIREBASE_SITE, ALTO_FIREBASE_PROJECT and ALTO_FIREBASE_CONFIG in the environment.

   The web config comes from Firebase console → Project settings → Your apps → SDK setup and configuration. It is spliced into alto-cloud.js at publish time. Leave it unset and sync is simply off: highlights stay in the browser's local storage on each device. ALTO_FIREBASE_BIN overrides the path to the firebase CLI if it is not on your PATH.

Two things worth knowing before you share a link. Published means public to anyone who has the URL — the address carries a random tail so it cannot be guessed, but it is not access-controlled. And a reader who signs in to sync their notes gets an account in your Firebase project: the security rules stop you reading their notes through the app, but you own the project and can see them in the Firebase console.

Repo layout

• engine/ — the three page templates, extracted content-free from the reference build. The extraction fixtures they were derived from are not published: they contain the author's own writing. test_roundtrip.py skips without them.
• alto/build/ — brief model, height estimator, layout resolver (a port of the engine's own), block generators, verifier, offline bundler.
• alto/mcp_server.py — the 14 MCP tools + interview prompt.
• alto/build/sanitize.py — makes user content inert before it reaches a page. Load-bearing: the engine renders detail sections straight into innerHTML.
• alto/publish_static.py — free-tier static publishing via the Firebase CLI.
• packaging/ — the .mcpb bundles, the download page and the registry entry. See packaging/README.md.
• alto/web.py, alto/auth/ — a full remote-server variant (streamable HTTP
  • OAuth 2.1), not used by the local install; kept for a future hosted deployment.

Development

.venv/bin/python -m pytest tests/        # incl. the golden round-trip
python3 -m alto.build samples/contracts_brief.json --bundle   # CLI build

Privacy

See alto/privacy.html. Short version: your source documents stay in your Claude conversation; the connector stores only what it builds, locally in ~/Documents/Alto (and, if you publish, on your own Firebase site).