rvt-mcp

rvt-mcp

MCP gateway for Autodesk Revit — local tools for agents, optional personal bake loop

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Install

Client machines should use the setup ZIP from GitHub Releases. It bundles a self-contained MCP server and Revit 2022–2027 plugins — no .NET SDK, NuGet global tool, or source clone.

AI agents: download RvtMcp.Setup-*-win-x64.zip from the latest release and run the installer. Do not clone, build, or dotnet tool install unless the user asked for a developer setup. Protocol: AGENTS.md.

$tag = (Invoke-RestMethod https://api.github.com/repos/bimwright/rvt-mcp/releases/latest).tag_name
$zip = "$env:TEMP\RvtMcp.Setup-$tag-win-x64.zip"
$dir = "$env:TEMP\RvtMcp.Setup-$tag-win-x64"
Invoke-WebRequest "https://github.com/bimwright/rvt-mcp/releases/download/$tag/RvtMcp.Setup-$tag-win-x64.zip" -OutFile $zip
Expand-Archive $zip -DestinationPath $dir -Force

powershell -ExecutionPolicy Bypass -File "$dir\install.ps1" -WhatIf
powershell -ExecutionPolicy Bypass -File "$dir\install.ps1"

The installer detects Revit 2022–2027, installs matching plugins, copies the server under %LOCALAPPDATA%\RvtMcp\rvt\server\<version>\, and wires detected MCP clients. Override with -Client codex|opencode|claude|kilo|none.

Do not install v0.5.0 or earlier ZIPs. Do not dotnet tool install -g Bimwright.Rvt.Server (legacy 0.1–0.3). Do not use NuGet instead of this ZIP on a Revit client machine — the tool package has no add-in.

For AutoCAD, use dwg-mcp separately — different product, different install.

Check that it works

1. Open Revit with a model.
2. Start the MCP connection from the ribbon (BIMwright / RvtMcp panel).
3. From the MCP client, list tools, then call revit_get_current_view_info.

You should get something like:

{ "viewName": "Level 1", "viewType": "FloorPlan", "levelName": "Level 1", "scale": 100 }

If that fails, install is not done yet — fix client config / plugin load before anything else.

Uninstall

From the setup ZIP root (or this repo’s scripts/):

# Setup ZIP layout:
powershell -ExecutionPolicy Bypass -File .\uninstall.ps1 -WhatIf
powershell -ExecutionPolicy Bypass -File .\uninstall.ps1 -Yes

# Clone layout:
powershell -ExecutionPolicy Bypass -File .\scripts\uninstall-all.ps1 -WhatIf
powershell -ExecutionPolicy Bypass -File .\scripts\uninstall-all.ps1 -Yes

Removes plugins, self-contained server, client entries, discovery files, logs, and ToolBaker cache.

Developer install

git clone https://github.com/bimwright/rvt-mcp.git
cd rvt-mcp
dotnet build src/RvtMcp.sln -c Debug
powershell -ExecutionPolicy Bypass -File .\scripts\install.ps1 -SourceDir . -Client none

Close every Revit first — the build deploys plugin DLLs into %APPDATA%\Autodesk\Revit\Addins\<year>\RvtMcp\. install.ps1 finds Revit 2022–2027, copies the server under %LOCALAPPDATA%\RvtMcp\rvt\server\<version>\, and wires detected MCP clients (-Client codex|opencode|claude|kilo|none, -Years 2024 for one year).

Optional — NuGet server only (does not install Revit plugins). Use this if the add-in is already on the machine (ZIP or a local build) and you want the MCP server on PATH:

dotnet tool uninstall -g Bimwright.Rvt.Server   # skip if you never installed the 0.1–0.3 tool
dotnet tool install -g RvtMcp.Server --version 0.6.1

Command name: rvt-mcp. Keep using the GitHub Release ZIP for plugins. Bimwright.Rvt.Server is obsolete.

Migrating from Bimwright.Rvt.* (v0.3 and earlier)

v0.4+ renamed packages and folders to RvtMcp.* (repo name and brand stay bimwright).

1. Close every Revit.
2. pwsh scripts/uninstall-old.ps1 — drops old %APPDATA%\…\Bimwright\ plugins and old server root; keeps user bake/journal data and migrates it to %LOCALAPPDATA%\RvtMcp\ on first new launch.
3. Install the current GitHub Release ZIP (Client install above). Do not install v0.5.0 or earlier packages. Uninstall the old global tool if present: dotnet tool uninstall -g Bimwright.Rvt.Server.
4. Point MCP clients at entry name rvt-mcp (old per-year bimwright-rvt-r22… entries are removed by the installer).

What this is

rvt-mcp is a local bridge between an MCP client (Claude, Cursor, Codex, OpenCode, …) and a running Revit session.

Two processes:

Agent → MCP → server → localhost TCP (≤2024) or Named Pipe (≥2025) → plugin → Revit API.

Everything stays on the machine. No cloud relay is required for the gateway itself.

There is no Node/TypeScript sidecar. Server, plugins, handlers, and ToolBaker are C# end to end. Shared command code lives in src/shared/; each year is a small shell project with #if where the API drifted. Details: ARCHITECTURE.md.

Why it exists

People who live in Revit already know what they want automated. The friction was always shipping that idea as software: learn enough C#/Dynamo, fight the API, package an add-in, survive version upgrades — or pay someone else, or buy a fixed tool that only half-matches the office.

Agents change the first half of that loop (describe the task, try it live). They do not remove transactions, units, selection, worksharing, or “did this just trash the model?” That is what this gateway is for: a typed tool surface for common work, plus an escape hatch when you need ad-hoc C# inside Revit, plus an optional path to turn repeated local patterns into personal tools (ToolBaker).

It is not a universal add-in for every firm. Offices differ. The bet is: start from a shared runtime, grow your tools on top.

Scope posture (honest): we do not mint a new MCP tool for every edge case. Prefer typed tools when they exist; for everything else use revit_send_code_to_revit (C# only). Family project management is covered; full Family Editor authoring suites and Revit Viewer hosts are out of scope for now — see docs/roadmap.md.

How a normal session looks

1. Revit open with a model; plugin connected (ribbon).
2. MCP client starts rvt-mcp / the installed server.
3. Agent uses tools: query view/selection, create grids/rooms, sheets, MEP, export, … Lengths in mm at the tool boundary.
4. Several writes in one undo step: revit_batch_execute.
5. Multiple Revits running: revit_list_available_targets then revit_switch_target with a four-digit year (2024, not R24).

When no typed tool fits:

revit_send_code_to_revit   # C# body, compiled and run inside the plugin

That tool is on by default (toolset meta). Strip it with --read-only or --disable-toolbaker if you do not want agents compiling code in the model.

ToolBaker (optional)

Default surface includes revit_send_code_to_revit. revit_list_baked_tools / revit_run_baked_tool need --toolsets toolbaker (or --toolsets all).

Adaptive bake (suggest new tools from usage) is off unless you enable it. When on, repeated patterns can show up under revit_list_bake_suggestions; you accept or dismiss explicitly. Nothing ships itself into your ribbon without that step.

Useful flags (also JSON / env — see Configuration):

Bake compile runs inside Revit via Roslyn — end users do not need Visual Studio. Details and privacy notes: docs/bake.md.

Toast (optional)

Completion toast in Revit is on by default. Turn off with the ribbon Toast button, enableToast: false in config, or BIMWRIGHT_ENABLE_TOAST=0. Only finished calls are shown (no “in progress” toast). Capture success can show a thumbnail when the file sits under the path allowlist. Ribbon Status also prints toast + bake/privacy flags so you can see what is enabled without guessing.

Architecture (short)

MCP client (stdio)
    → RvtMcp.Server (.NET 8)
        → TCP (Revit 2022–2024) or Named Pipe (2025–2027)
            → Plugin shell (per year)
                → ExternalEvent → Revit API / transactions / undo

Handlers return plain DTOs — never live Revit objects on the wire.

Tools

Counts (without counting personal baked tools):

Tool names are MCP-facing as revit_*. Wire names between server and plugin stay unprefixed snake_case.

Default-on toolsets: query, create, view, meta

Off unless you ask: everything else (export, geometry, mep, structural, toolbaker, modify, delete, …).
Example: --toolsets query,view,meta or --toolsets all.
--read-only drops every write-capable toolset (including create).

Representative tools

Not a full dump of 200+ schemas — just anchors agents and humans use often:

Golden snapshots in tests pin the exact surface; if counts and code disagree, trust tests/code.

Supported Revit versions

Compile matrix covers all six shells. Runtime depth still varies by year — bake and custom C# should be rechecked on the years you care about.

Host: full Revit desktop only. Revit Viewer is not a supported target.

Security and privacy

• Transport is local by default (loopback TCP / local named pipe).
• Discovery files under %LOCALAPPDATA%\RvtMcp\ include a per-session auth token.
• Tool arguments are schema-checked before handlers run.
• Errors returned to the model are sanitized (path leakage reduced).
• send_code can run arbitrary C# in the Revit process — powerful and risky; disable toolbaker if that is unacceptable.
• Adaptive bake, body cache, and TTL journals are opt-in and stay under the user profile. Defaults do not write raw send_code bodies to long-lived logs.

More: SECURITY.md, docs/bake.md.

Configuration

Precedence, high wins: CLI → env (BIMWRIGHT_*) → %LOCALAPPDATA%\RvtMcp\rvtmcp.config.json.

After changing server flags, restart the MCP connection so the client picks up the new tool list.

MCP clients

Installer auto-detect is usually enough; see AGENTS.md and docs/mcp-config-*.md when hand-editing.

Repo layout

rvt-mcp/
├── src/
│   ├── RvtMcp.sln
│   ├── server/            # MCP server
│   ├── shared/            # Handlers, transport, ToolBaker, toast, …
│   ├── plugin-r22/ … r27/ # One shell per Revit year
├── tests/                 # xUnit + golden tool lists
├── scripts/               # install / uninstall / package
├── docs/                  # roadmap, bake, testing
├── AGENTS.md
└── ARCHITECTURE.md

Development

dotnet test tests/RvtMcp.Tests/RvtMcp.Tests.csproj
dotnet build src/server/RvtMcp.Server.csproj -c Release
dotnet build src/plugin-r26/RvtMcp.Plugin.R26.csproj -c Release

Close Revit before building plugins (DLL lock). Plugin projects deploy into %APPDATA%\Autodesk\Revit\Addins\<year>\RvtMcp\ on a normal Debug/Release build.

pwsh scripts/stage-plugin-zip.ps1 -Config Release

Contribution norms and snapshot rules: CONTRIBUTING.md.

Maturity

Usable, not sacred. CI builds the six plugin shells and server tests. Runtime coverage is strongest on mid-range years; treat production models carefully and verify on your Revit build. Fresh-machine checklist: docs/testing/fresh-install-checklist.md.

More docs

bimwright

Open-source tools connecting AI assistants to BIM and CAD applications.

The name bimwright combines BIM with wright, an old word for a maker or builder—as in shipwright.

• rvt-mcp — Revit
• dwg-mcp — AutoCAD
• nwd-mcp — Navisworks
• ipt-mcp — Inventor
• bim-wiki — Vietnamese-first BIM notes

License

Apache-2.0 — LICENSE.

Revit and Autodesk are trademarks of Autodesk, Inc. bimwright is independent and not affiliated with Autodesk.