Revit MCP - AI-Powered Revit Control

English | 繁體中文

Revit MCP lets AI clients call Autodesk Revit tools through the Model Context Protocol (MCP). The MCP server forwards tool calls to a local Revit add-in, and the add-in executes the corresponding Revit API workflow.

• Demo video: Revit MCP - AI-Powered BIM Workflow Demonstration

• Knowledge site: https://shuotao.github.io/REVIT_MCP_study/

• Default WebSocket port: 8964

What is this?

Talk to Revit in plain language. Ask your AI client to "dimension every wall on this view" or "check the curtain-wall elevations", and Revit does it — through 166 MCP tools backed by 72 professional BIM SOPs (building code, quantity take-off, compliance checks).

Who it's for: BIM engineers and architects who use Revit and want AI-assisted, standards-based workflows. You'll need Revit (2022–2026) on Windows and to be comfortable installing an add-in.

Related MCP server: revit-mcp

Quickstart (3 steps)

1. Install the Revit add-in. Build and deploy the C# add-in — see Manual Setup. This is the half that actually talks to Revit.

2. Point your AI client at the MCP server. No cloning needed — it runs straight from npm:

   { "mcpServers": { "revit-mcp": { "command": "npx", "args": ["-y", "@shuotao/revit-mcp-server"] } } }

3. Open Revit, enable the MCP service in the ribbon, and start asking. Full setup: AI Client Configuration.

Questions or want to show what you built? → Discussions

Current Project Counts

When these numbers change, update CLAUDE.md, README.zh-TW.md, this file, docs/DOCUMENT_AUDIENCE_INVENTORY.md, and run:

.\scripts\verify-qaqc.ps1 -SkipBuild -SkipDeploy

Architecture

AI Client
  Claude Desktop / Claude Code / Gemini CLI / VS Code Copilot / Antigravity
        |
        | stdio
        v
MCP Server
  Node.js / TypeScript
  MCP-Server/build/index.js
        |
        | WebSocket ws://localhost:8964
        v
Revit Add-in
  C# / Revit API
  MCP/Application.cs
  MCP/Core/SocketService.cs
  MCP/Core/ExternalEventManager.cs
        |
        v
Autodesk Revit

External AI clients do not need an API key inside this repository. Their account and authorization are managed by the AI client itself. Only an embedded Revit chat feature that directly calls an AI API would need an API key.

Requirements

One-Click Setup

Recommended for new users:

.\scripts\setup.ps1

For AI agents or non-interactive setup:

powershell -ExecutionPolicy Bypass -File scripts/setup.ps1 -NonInteractive -RevitVersions "2024,2025"

The setup script checks prerequisites, installs dependencies, builds the MCP server, builds and deploys the Revit add-in, and helps configure common AI clients.

Install from MCP Registry

The MCP server is published on the MCP Registry as io.github.shuotao/revit-mcp-server (npm package @shuotao/revit-mcp-server). Run it directly with:

npx -y @shuotao/revit-mcp-server

Note: this npm package is only the Node stdio bridge. The C# Revit add-in (MCP/) must still be installed separately — follow Manual Setup below for your Revit version.

Manual Setup

1. Build the MCP Server

cd MCP-Server
npm install
npm run build

AI clients launch:

node MCP-Server/build/index.js

2. Build the Revit Add-in

Choose the configuration that matches your Revit version:

cd MCP
dotnet build -c Release.R22 RevitMCP.csproj   # Revit 2022
dotnet build -c Release.R23 RevitMCP.csproj   # Revit 2023
dotnet build -c Release.R24 RevitMCP.csproj   # Revit 2024
dotnet build -c Release.R25 RevitMCP.csproj   # Revit 2025
dotnet build -c Release.R26 RevitMCP.csproj   # Revit 2026

Expected output:

MCP/bin/Release.R{YY}/RevitMCP.dll

Example for Revit 2024:

MCP/bin/Release.R24/RevitMCP.dll

3. Deploy the Add-in

Recommended:

.\scripts\install-addon.ps1

For manual deployment, place the .addin file and DLL under the matching Revit Addins directory, and keep the relative assembly path in RevitMCP.addin:

<Assembly>RevitMCP\RevitMCP.dll</Assembly>

Do not create version-specific .addin files, and do not hardcode absolute DLL paths.

AI Client Configuration

Project-level .mcp.json:

{
  "mcpServers": {
    "revit-mcp": {
      "type": "stdio",
      "command": "node",
      "args": ["./MCP-Server/build/index.js"],
      "env": {}
    }
  }
}

VS Code config in .vscode/mcp.json:

{
  "servers": {
    "revit-mcp": {
      "type": "stdio",
      "command": "node",
      "args": ["${workspaceFolder}/MCP-Server/build/index.js"],
      "env": {}
    }
  }
}

Other AI clients use the same concept: launch MCP-Server/build/index.js with node.

Config template per client:

Replace <YOUR_PROJECT_PATH> in the templates with the actual project path on your machine.

Switching Between AI Clients

The Revit-side WebSocket service accepts only one MCP connection at a time: a newly connected MCP server replaces the previous connection. Multiple AI clients are therefore used by switching, not concurrently:

1. Close the current AI client (or disable its MCP server).

2. Start the other AI client; once its MCP server connects to localhost:8964, it takes over.

3. If the connection misbehaves, restart the MCP service from the Revit ribbon to reset it.

Startup Flow

1. Start Revit.

2. Open or create a Revit project.

3. Enable the MCP service from the Revit ribbon.

4. Confirm the Revit add-in is listening on localhost:8964.

5. Start or restart the AI client so it loads the MCP server.

6. Call Revit MCP tools from the AI client.

If localhost:8964 is unreachable, Revit may not be running, the MCP service may be off, the port may be occupied, or the AI client and Revit add-in may be using different port settings.

Project Structure

REVIT_MCP/
  MCP/                         Revit Add-in (C#)
    Application.cs             Revit add-in entry point
    RevitMCP.csproj            Single multi-version project
    RevitMCP.addin             Single add-in manifest
    Core/
      SocketService.cs         Revit-side WebSocket server
      ExternalEventManager.cs  UI-thread execution bridge
      RevitCompatibility.cs    Revit 2022-2026 compatibility helpers
      CommandExecutor.cs       Main command dispatcher
      Commands/*.cs            Command modules
  MCP-Server/                  MCP Server (Node.js / TypeScript)
    src/index.ts               stdio MCP server entry
    src/socket.ts              WebSocket client to Revit
    src/tools/*.ts             MCP tool definitions
  domain/                      Shared BIM SOPs; do not convert to English-only
  .claude/                     AI commands and skills
  docs/                        Human-facing docs and public knowledge site
  scripts/                     Setup, deployment, QA/QC scripts
  log/                         Append-only session and commit logs

AI Docs and Human Docs

See docs/DOCUMENT_AUDIENCE_INVENTORY.md.

Domain, Skill, and Tool Responsibilities

• domain/*.md: BIM SOPs, regulatory logic, and calculation methods. Shared by humans and AI.

• .claude/skills/*/SKILL.md: AI workflow orchestration.

• MCP-Server/src/tools/*.ts: MCP tool definitions and input schemas.

• MCP/Core/Commands/*.cs: Revit API implementation.

If a Domain file and a Skill disagree on method, the Domain file wins.

QA/QC

After documentation, tool, Domain, Skill, build, or deployment changes, run:

.\scripts\verify-qaqc.ps1 -SkipBuild -SkipDeploy

Before deployment, run a full check:

.\scripts\verify-qaqc.ps1 -Version 2024

QA/QC checks:

• forbidden legacy files and paths

• required file structure

• README / CLAUDE / docs count alignment

• Domain table forward and reverse coverage

• local Markdown link rot

• Domain frontmatter

• document audience classification

• mojibake risk in canonical docs

Troubleshooting

AI cannot find Revit tools

Check:

1. npm run build has been run in MCP-Server.

2. The AI client's MCP config points to the correct MCP-Server/build/index.js.

3. The AI client has been restarted or has reloaded MCP servers.

MCP Server cannot connect to Revit

Check:

1. Revit is running.

2. The MCP service is enabled in the Revit ribbon.

3. localhost:8964 is not occupied.

4. If HTTP.sys / PID 4 is holding the port, try:

powershell -ExecutionPolicy Bypass -File scripts\release-port.ps1

Revit does not show the MCP Tools panel

Confirm the .addin file and DLL were deployed under the matching %APPDATA%\Autodesk\Revit\Addins\{version} directory, then restart Revit.

Important Rules

• Keep one MCP/RevitMCP.csproj.

• Keep one MCP/RevitMCP.addin.

• Do not create version-specific .csproj or .addin files.

• Do not create nested MCP/MCP/ directories.

• Do not change .addin <Assembly> to an absolute path.

• Do not convert Domain files to English-only.

• Do not bypass the MCP server with hand-written WebSocket JSON.

• For live Revit view, level, selection, or document state, AI must query live state in the current turn.

Document Navigation

License

MIT License