dcc-mcp-openscad

Production OpenSCAD adapter for deterministic model inspection, validation, geometry export, and PNG rendering through DCC-MCP.

Illustrative workflow based on the live OpenSCAD → FreeCAD → Blender/Godot acceptance run; generated source is retained in docs/images/dcc-mcp-openscad-showcase-source.png.

Capabilities

• Detect the standalone OpenSCAD CLI and report version-specific capabilities.
• Inspect modules, functions, variables, and include/use references without executing source.
• Validate a parameterized model with structured warning/error diagnostics.
• Export STL (explicit binary or ASCII), 3MF, AMF, OFF, CSG, DXF, SVG, PDF, and OpenSCAD diagnostic formats.
• Render bounded PNG previews or full geometry renders with typed camera, projection, color-scheme, size, and parameter inputs.
• Stage outputs atomically and return file size plus SHA-256 provenance.

The adapter does not accept arbitrary OpenSCAD command-line arguments or raw -D expressions. JSON scalar/array parameters are encoded by the adapter.

Requirements

• Python 3.7+
• dcc-mcp-core 0.19.91+
• OpenSCAD 2021.01 or newer

On Windows, point to openscad.com when possible; if openscad.exe is configured and a sibling openscad.com exists, the adapter selects the console launcher automatically.

Install

python -m pip install dcc-mcp-openscad
dcc-mcp-openscad

For development:

python -m pip install -e ".[dev]"
python -m pytest

Configuration

The service registers as a standalone DCC-MCP instance. It has no bound GUI PID and needs no OpenSCAD window.

Agent workflow

Use the standard discovery path:

dcc-mcp-cli list
dcc-mcp-cli search --query "OpenSCAD validate export STL"
dcc-mcp-cli load-skill openscad-pipeline --dcc-type openscad --instance-id <instance-short>
dcc-mcp-cli describe openscad.<instance-short>.openscad_pipeline__validate_model

Then call inspect_source → validate_model → export_model or render_preview. Long calls are asynchronous and should be polled through the core job tools returned by the call.

examples/production_smoke.scad is a parameterized enclosure used by the live acceptance test. Override width, depth, height, wall, corner_radius, or vent_count to verify safe parameter encoding and reproducible artifacts.

Safety contract

• Source and output paths must remain under configured allowed roots.
• Existing outputs are never replaced unless overwrite=true is explicit.
• Exports use sibling temporary files and become visible only after success.
• Parameter names, values, nesting, count, image dimensions, formats, and deadlines are bounded.
• Cancellation and timeouts terminate the owned OpenSCAD child process.
• Captured process output is limited to 64 KiB per stream.

OpenSCAD CLI reference: https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Using_OpenSCAD_in_a_command_line_environment