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civil3d-mcp-roslyn

Dynamic Roslyn-based MCP server for Autodesk Civil 3D. Current compatibility baseline: Civil 3D 2025.

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Data offered docs-verified: Read-only C# query execution inside Civil 3D (civil3d_query) · C# execution with write access and optional drawing save (civil3d_execute) · Browse, search and read of C# code skill templates (civil3d_skills) · Search of already-loaded public Civil 3D API names and signatures (civil3d_skills api_lookup)
Formats llm-inferred: MCP stdio · JSON (tool results)
Access llm-inferred: Open-source, MIT licence (per ENTRY metadata). No authentication. Requires a local, licensed Autodesk Civil 3D installation with the plugin loaded; Autodesk assemblies are not included.

Use cases llm-inferred: Listing and auditing surfaces, alignments and profiles in a drawing before a design QA check · Generating cut, fill and net volumes between two TIN surfaces within labelled closed polylines · Building offset alignments such as pavement edges from PI coordinates for highway or drainage layouts
Audience llm-inferred: BIM/civils engineers · drainage engineers · highway designers · CAD technicians

Constraints llm-inferred: Compatibility baseline is Autodesk Civil 3D 2025 only; other versions need separate verified compatibility work · Requires a running Civil 3D session with the plugin loaded · civil3d_query runs trusted code and is not a side-effect sandbox · civil3d_execute modifies the open drawing and can save it to disk · Many recipes are unverified live, including populated DREF/target cases and section-view saved-file reopen · Scripts using await are rejected; 120-second script timeout; long single Civil API calls cannot be interrupted · Independent fork not affiliated with or endorsed by Autodesk; derived from barbosaihan/civil3d-mcp, so maintenance risk applies

Auto-extracted, unverified fields: tools, install, auth. Check upstream documentation.

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

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