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Civil 3D MCP Server

by DaniGhosy
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Civil 3D MCP Server

An MCP (Model Context Protocol) server that enables AI assistants (Claude, Cline, etc.) to interact with Autodesk Civil 3D through natural language.

Architecture

┌─────────────────┐     stdio      ┌──────────────────┐     TCP/JSON-RPC    ┌──────────────────┐
│   AI Assistant   │ ◄────────────► │  MCP Server (TS) │ ◄──────────────────► │  Civil 3D Plugin │
│ (Claude, Cline)  │               │   Node.js         │     port 8080       │   (.NET 8.0 C#)  │
└─────────────────┘               └──────────────────┘                      └──────────────────┘
                                                                                     │
                                                                              Civil 3D API
                                                                            (Surfaces, Alignments,
                                                                             Points, Corridors...)

The system has two components:

  1. MCP Server (TypeScript/Node.js) — Communicates with AI assistants via MCP protocol

  2. Civil 3D Plugin (C# .NET 8.0) — Runs inside Civil 3D and executes API commands

Related MCP server: APS ACC MCP Server

Available Tools

Tool

Actions

Description

civil3d_health

health

Check plugin connectivity

civil3d_drawing

info, settings, save, undo, redo, list_object_types, get_selected

Drawing operations

civil3d_surface

list, get, get_elevation, get_statistics, create, delete, add_points, add_breakline, add_boundary, extract_contours, compute_volume

Surface management

civil3d_alignment

list, get, create, delete, station_to_point, point_to_station

Alignment operations

civil3d_profile

list, get, get_elevation, create_from_surface, create_layout, delete

Profile management

civil3d_corridor

list, get, rebuild, get_surfaces, get_feature_lines, compute_volumes

Corridor operations

civil3d_pipe

list_networks, get_network, get_pipe, get_structure, create_network, add_pipe, add_structure, check_interference

Pipe networks

civil3d_point

list, get, create, delete, list_groups, import

COGO points

civil3d_geometry

create_line, create_polyline, create_3d_polyline, create_text, create_mtext

Basic AutoCAD geometry

Setup

1. Build the MCP Server

npm install
npm run build

2. Build the Civil 3D Plugin

  1. Copy the required DLLs from your Civil 3D installation to C_References/ (see C_References/README.md)

  2. Build the plugin:

cd plugin/Civil3dMcpPlugin
dotnet build

3. Load the Plugin in Civil 3D

  1. Open Civil 3D 2025+

  2. Type NETLOAD in the command line

  3. Browse to plugin/Civil3dMcpPlugin/bin/Debug/net8.0-windows/Civil3dMcpPlugin.dll

  4. The plugin starts automatically. Use C3DMCPSTATUS to verify.

4. Configure Your AI Assistant

Claude Desktop — Add to claude_desktop_config.json:

{
  "mcpServers": {
    "civil3d": {
      "command": "node",
      "args": ["/path/to/civil3d-mcp/build/index.js"]
    }
  }
}

Environment Variables

Variable

Default

Description

CIVIL3D_HOST

localhost

Civil 3D plugin host

CIVIL3D_PORT

8080

Civil 3D plugin port

CIVIL3D_CONNECT_TIMEOUT

5000

Connection timeout (ms)

CIVIL3D_COMMAND_TIMEOUT

120000

Command execution timeout (ms)

LOG_LEVEL

info

Log level (debug, info, warn, error)

Plugin Commands

Command

Description

C3DMCPSTART

Start the TCP listener

C3DMCPSTOP

Stop the TCP listener

C3DMCPSTATUS

Check listener status

License

MIT

Install Server
A
license - permissive license
A
quality
C
maintenance

How are these scores calculated?

Maintenance

–Maintainers
–Response time
–Release cycle
–Releases (12mo)
Commit activity

Resources

Unclaimed servers have limited discoverability.

Looking for Admin?

If you are the server author, to access and configure the admin panel.

Tools

View all tools

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