dcc-mcp-substance3d-designer
Adapter that runs an MCP server inside Substance 3D Designer, enabling tools to inspect and interact with the active designer session and its packages through natural language.
README
dcc-mcp-substance3d-designer
Substance 3D Designer adapter for the DCC Model Context Protocol (MCP).
The package runs an embedded Streamable HTTP MCP server inside Designer, so tools execute through Designer's Qt main thread instead of a separate process.
Install and load
Install this package with the Python environment used by Substance 3D Designer:
python -m pip install dcc-mcp-substance3d-designer
In Designer, open Tools > Plugin Manager, browse to the installed
dcc_mcp_substance3d_designer/designer_plugin.py, then load the plugin. The
MCP endpoint defaults to http://127.0.0.1:8765/mcp.
Set DCC_MCP_SUBSTANCE3D_DESIGNER_PORT before launching Designer to choose a
different port. Standard DCC_MCP_GATEWAY_PORT and DCC_MCP_REGISTRY_DIR
settings are also honoured.
Bundled skills
designer-session provides read-only typed tools for inspecting the active
Designer session and its loaded packages. Host APIs are imported only while a
tool runs, so metadata discovery remains safe outside Designer.
Development
python -m pip install -e ".[dev]"
python -m pytest
ruff check src tests tools
python -m build
Releases use release-please. The release.yml workflow publishes through the
pypi environment using PyPI Trusted Publishing.
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