Model MCP server

The Python package of Model MCP for Autodesk® Revit® exposes Revit tools over MCP stdio; actions run by default. Set REVIT_MCP_READ_ONLY=1 or create the workstation read-only file to disable them without hiding the action tools. It requires Python 3.11 or later and the matching add-in loaded in Revit on Windows.

Install and run

After the first PyPI release, run the published package with uv:

uvx revit-model-mcp

Register the local Windows server with Claude Code:

claude mcp add revit-model-mcp -e REVIT_MCP_HOST=local -- uvx revit-model-mcp

For a client on macOS or Linux:

claude mcp add revit-model-mcp -e REVIT_MCP_HOST=ssh:revit-host -e REVIT_MCP_REDACT_PATHS=1 -- uvx revit-model-mcp

Replace revit-host with an alias from the client's SSH configuration. The Windows SSH session must use the same account as Revit or an explicitly shared channel directory.

Claude Desktop uses this entry in claude_desktop_config.json on Windows:

{
  "mcpServers": {
    "revit-model-mcp": {
      "command": "uvx",
      "args": ["revit-model-mcp"],
      "env": {
        "REVIT_MCP_HOST": "local",
        "REVIT_MCP_REDACT_PATHS": "1"
      }
    }
  }
}

uvx must be available on the client's PATH; an absolute executable path is also supported. A remote Desktop client uses REVIT_MCP_HOST=ssh:revit-host.

For development or before the first PyPI publication, run from the repository root:

uv run --directory server revit-model-mcp
claude mcp add revit-model-mcp -e REVIT_MCP_HOST=local -- uv run --directory /absolute/path/to/revit-model-mcp/server revit-model-mcp

mcp-name: io.github.sharafutdinovdi/revit-model-mcp

Configuration

Set server variables in the MCP client's env block. Set add-in variables in the environment of the Revit process before it starts, and restart Revit after a change. Boolean server variables accept 1, true, yes, on and 0, false, no, off; any other value is an error. Add-in variables that say 1 accept only 1.

The add-in also reads REVIT_MCP_BATCH_WORKER; the batch supervisor sets it on worker processes, so do not set it yourself. See the settings reference for the settings.json keys.

revit_family_audit is a read tool. It inspects an open family when families is omitted, or exact family names / ["*"] in a project. revit_edit_families applies ordered shared-parameter, removal, purge and shared-flag operations. Project edits use one family load per family and one undo entry; dry_run=true rolls back. The edit tool is refused in read-only mode. Family audit defaults to a 600-second response budget; family edits default to 1800 seconds.

SSH mode passes ControlMaster=auto, ControlPath=<dir>/mux-%C and ControlPersist=600 on every invocation. The socket directory is $XDG_RUNTIME_DIR when nonempty, otherwise /tmp/revit-model-mcp-<uid>/. The directory is created or restricted to mode 0700 on macOS and Linux. Keep its absolute path short for Unix socket limits; %C hashes the connection identity. The master connection remains available for 600 seconds after its last client disconnects. Extra options follow OpenSSH's first-value-wins behavior. To supply a custom multiplexing path or lifetime, set REVIT_MCP_SSH_MUX=0 and provide all three Control* options through REVIT_MCP_SSH_OPTIONS. Clients whose OpenSSH lacks multiplexing support, such as native Windows OpenSSH, use REVIT_MCP_SSH_MUX=0.

uv run --directory server revit-model-mcp --help prints the environment host mode, Windows channel directory and path redaction flag without contacting Revit.

The server reads activation configuration at process startup. A configured task may restore and focus the Revit window. Without a task the server only polls for pickup.

Responses and privacy

Model paths occur in responder metadata and instance listings. Redaction covers documentPath, path and centralPath fields in MCP results, including RVT/CAD/image link paths from revit_links_status. It also reduces Windows drive and UNC paths in confirmationText, summary, error, message, warning and warnings strings at any depth to file names, including tool errors. It preserves exported image localPath values for clients that open the downloaded file. Names, parameter values and remaining message text stay visible. Redaction applies to outgoing Python responses, not files stored in the channel or add-in logs. Revit model data and errors can retain their original language. Python tool descriptions and server-generated messages are English.

Request behavior

For HTTP setup and remote access commands, see transport. HTTP submits once and polls by job ID within timeout_seconds; pickup timeout applies only to file transports. HTTP exports download PNG directly without remote PowerShell. Each HTTP endpoint represents one Revit process.

The default file pickup timeout is 300 seconds. The response timeout is 120 seconds after pickup. Most tools accept pickup_timeout_seconds and timeout_seconds. revit_export_view uses the defaults. Supply document when multiple Revit instances run on the host. Use a distinctive document title or file name. Matching is case-insensitive and accepts substrings. A pending job remains in the channel after pickup timeout and may execute later. Use one MCP server process per channel directory.

See transport for file handling and SSH behavior.

Tests

From the repository root:

cd server
uv run --with pytest pytest -q

The tests use mocked host operations and exercise MCP stdio without Revit.

See the tool arguments, action arguments and response contract.

License

MIT, copyright (c) 2026 Dinar Sharafutdinov.