Civil 3D MCP

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

┌─────────────────┐ 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...)

- MCP Server(TypeScript/Node.js) — Communicates with AI assistants via MCP protocol
- Civil 3D Plugin(C#.NET 8.0) — Runs inside Civil 3D and executes API commands
- Copy the required DLLs from your Civil 3D installation toC_References/(seeC_References/README.md)
- Build the plugin:
- Open Civil 3D 2025+
- TypeNETLOADin the command line
- Browse toplugin/Civil3dMcpPlugin/bin/Debug/net8.0-windows/Civil3dMcpPlugin.dll
- The plugin starts automatically. UseC3DMCPSTATUSto verify.

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

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