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civil3d-mcp

AI-Powered Civil 3D Modeling

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Data offered docs-verified: AI-generated C# code execution inside Civil 3D (write access, transaction committed) · Read-only C# code queries against the active drawing · Browsable skills library of C# code templates (surfaces, alignments, points, geometry, drawing info, workflows)
Formats docs-verified: MCP stdio · JSON
Access docs-verified: Open source under the MIT licence. Requires a local Autodesk Civil 3D installation, with DLLs copied from Civil 3D and the plugin loaded in the application. No credentials documented.

Use cases llm-inferred: Read-only audit of surfaces, alignments and COGO points with their layers before issuing a drawing · Scripted extraction of surface and alignment station/offset data for a drainage or highway design check · Batch creation of repetitive civils objects from skill templates in a design workflow
Audience llm-inferred: civils BIM engineers · drainage engineers · highway engineers · CAD technicians

Constraints llm-inferred: Requires Autodesk Civil 3D to be running with the plugin loaded (NETLOAD, C3DMCPSTATUS to verify) · civil3d_execute modifies the drawing and commits the transaction · Roslyn sandbox blocks process execution, file deletion, network requests, registry access and dynamic assembly loading · Default execution timeout is 120000 ms · Argument names for the three tools are not documented in DOCS; the code parameter name in example_tool_calls is inferred · Code is AI-generated and runs with full Civil 3D API access, so output needs review before use on live drawings · Windows and Civil 3D version requirements are not stated in DOCS

Tools/install/auth auto-extracted from README; quality score heuristic (stars, recency, tool count, licence).

Metadata observed 15/10/2026 · research sweep: github-search