FDTD Lumerical MCP
Local MCP server for controlling Ansys Lumerical FDTD from Codex.
README
FDTD Lumerical MCP
Local MCP server for controlling Ansys Lumerical FDTD from Codex.
The server uses the Lumerical Python Automation API (lumapi) from an existing
Ansys/Lumerical installation. lumapi is not installed from pip.
Setup
cd "C:\path\to\FDTD-Lumerical-mcp"
python -m pip install -e ".[dev]"
Set LUMERICAL_API_PATH if automatic discovery cannot find lumapi.py:
$env:LUMERICAL_API_PATH = "C:\Program Files\Ansys Inc\vXXX\Lumerical\api\python\lumapi.py"
Optional workspace override:
$env:FDTD_WORKSPACE = "C:\path\to\FDTD-Lumerical-mcp\workspace"
Run the server:
python -m fdtd_mcp.server
Verification
Run unit tests without opening FDTD:
python -m pytest -q
Run the real MCP/FDTD smoke test:
$env:FDTD_INTEGRATION = "1"
python -m pytest -q -m integration
Codex MCP Config
See .codex/config.toml.example.
Safety Model
Project and export file paths are restricted to FDTD_WORKSPACE, which defaults
to the repository workspace/ directory when the MCP server is launched from
the project root.
Tools that execute user script or run simulations should stay in prompt approval mode in Codex configuration.
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