ACC MCP Server (for Claude web)

A remote Model Context Protocol server that lets Claude on claude.ai browse your Autodesk Construction Cloud (ACC) hubs/projects/files and hand you a link that opens the actual model in a hosted Autodesk Viewer page.

Why this shape: Claude web only connects to remote, publicly-reachable MCP servers (Streamable HTTP). It cannot run a local stdio server on your Mac, and it cannot render the real Autodesk Viewer (WebGL + Autodesk's own JS/CSS) inline in the chat — so the get_viewer_link tool gives you a URL that opens a small hosted viewer page in your browser instead.

1. Create an APS app (3-legged)

1. Go to https://aps.autodesk.com/myapps and create a new app.

2. Choose app type "Traditional Web App" (this is the 3-legged OAuth type — you need this, not "Server-to-Server", because the MCP server needs to act as you to see your ACC projects).

3. Set the Callback URL to: https://YOUR-DOMAIN/aps/callback (use the same domain you'll deploy to in step 3 — you can update this later once you know it).

4. Note the Client ID and Client Secret.

2. Provision the app in ACC

Your APS app needs to be added as a custom integration in your ACC account before it can see any projects:

1. In the ACC/BIM 360 admin panel, go to Account Admin > Custom Integrations and add your APS app (by Client ID).

2. Add it to the specific projects you want visible (or give it account-wide access, depending on your admin settings).

3. Deploy the server

This is a plain Node.js/Express app — deploy it anywhere that gives you a public HTTPS URL. Render.com's free tier is the easiest for testing:

cd acc-mcp-server
npm install

Render.com (easiest):

1. Push this folder to a GitHub repo.

2. On Render: New > Web Service > connect the repo.

3. Build command: npm install. Start command: npm start.

4. Add environment variables (see .env.example) in Render's dashboard.

5. Once deployed, Render gives you a URL like https://acc-mcp.onrender.com — set that as PUBLIC_BASE_URL, redeploy, and also update the APS app's callback URL (step 1.3) to https://acc-mcp.onrender.com/aps/callback.

Any other host (Fly.io, Railway, a VPS, AWS): same idea — just make sure the process is reachable over HTTPS at the domain you put in PUBLIC_BASE_URL.

Local test only (not reachable by Claude, but useful for sanity-checking):

npm start

4. Add it as a custom connector in Claude

1. In claude.ai: Settings > Connectors (or the "+" button in a chat > "Connectors").

2. Click Add custom connector.

3. Paste your server's MCP URL: https://YOUR-DOMAIN/mcp

4. Click Add. Claude will discover the OAuth endpoints automatically (via /.well-known/oauth-authorization-server) and walk you through logging into Autodesk — you'll see Autodesk's real login/consent screen.

5. Enable the connector for your conversation (per-conversation toggle via the "+" button > Connectors).

5. Using it

Once connected, you can ask things like:

• "List my ACC hubs"

• "Show me the projects in [hub name]"

• "List the files in the Project Files folder of [project name]"

• "Give me a link to open [model name] in the viewer"

The last one returns a URL — open it in your browser to see the real Autodesk Viewer with your model loaded.

Notes on what's simplified here

• Token storage is in-memory. Restarting the server logs everyone out and drops in-flight OAuth handshakes. For anything beyond testing, swap the Map()s in server.js (sessions, authCodes, mcpTokens) for a Postgres table — since you're already running Postgres locally, something like:

  create table mcp_sessions (
    session_id uuid primary key,
    aps_access_token text,
    aps_refresh_token text,
    aps_expires_at timestamptz
  );

  is a drop-in replacement for the sessions Map.

• Single ACC integration only. This doesn't distinguish between multiple Autodesk accounts/users beyond one OAuth session per browser login — fine for personal use, would need per-user scoping for a team.

• Tools are read/browse-only (list_hubs, list_projects, list_top_folders, list_folder_contents, get_viewer_link). Adding ACC Issues, markups, or write actions means adding more tools that call the corresponding APS endpoints the same way — the pattern in server.js (mcp.registerTool(...)) is copy-pasteable.

• Viewer page uses your 3-legged session token. ACC/BIM 360-hosted derivatives require the viewing user's own account access — a generic app-level 2-legged token can't read their manifests — so the viewer link is tied to your login and expires with the short-lived signed link (15 min), not a separate long-lived credential.