CalculiX MCP

An MCP server that exposes the open-sourceCalculiXFEM solver (ccx) to MCP clients. CalculiX is GPLv2, needs no license, and runs as a fire-and-forget CLI — so this server is fully self-contained, with no live-session bridge and no license state machine.

The workflow is: parse a CalculiX/Abaqus.inpdeck, inspect its tunable design variables, edit a value in place, submit it toccx, read the text results (.dat), and export those.datresults toresult_mesh.jsonso the repo'sText to CAE Viewercan render the mesh and stress field.

optimize_structure_tool( path="examples/bracket.inp", variables={"shell.PLATE.thickness": [2.0, 8.0]}, n_lhs=8, max_solves=18, ) # -> best ~4.1 mm, ~-48% mass, stress < 250 MPa, displacement < 1.5 mm

- Shell/beam models only.Solids (C3D8) expose no scalar geometry card, so there is no thickness to thin; use shape/topology optimization instead.
- This issizing/parameter optimization, not topology optimization— it thins sections, it does not redistribute material in space.
- The best deck is written next to the input as<stem>.optimized.inp; pass it toexport_results_toolto render the optimized design.

From this directory (Linux/macOS; adapt the venv activation on Windows):

uv venv .venv --python 3.11 uv pip install --python .venv/bin/python "mcp>=1.0,<1.8" meshio numpy "python-dotenv>=1,<2" uv pip install --python .venv/bin/python pytest # dev only

mcpis pinned below 1.8:mcp2.0 removedmcp.server.fastmcp(the FastMCP import used here and by the hub's other MCPs).

Install CalculiX separately (e.g.ccxorccx_preCICEon your PATH, or setCCX_EXE).fea_healthwill tell you whether the executable was detected.

.venv/bin/python mcp_server.py # stdio MCP transport

Register it with an MCP client usingexamples/mcp_config.example.json.

examples/cantilever.inpis apublic textbook cantilever(steel C3D8 solid bar, clamped at one end, transversely loaded at the other). Regenerate it with:

Hand-calc sanity targets (Euler-Bernoulli, mm-t-s-MPa, P = 100 N): tip deflection ≈ 0.8 mm, root stress ≈ 140 MPa. The viewer auto-magnifies the small elastic deformation for display.

Parser and exporter tests run without a solver. Solver tests are skipped automatically whenccxis not detected, so the suite stays green before CalculiX is installed.

- mcp_server.py— FastMCP stdio server.
- tools/inp_parser.py—.inpcard parsing + text in-place editing.
- tools/solver.py—ccxsubprocess +.datresult parsing.
- tools/result_exporter.py—.dat/.inp→result_mesh.json(viewer format).
- tools/optimizer.py— two-stage sizing optimization (LHS + coordinate descent).
- examples/— public cantilever benchmark + generator + MCP config example.
- tests/— pytest suite.

Commit only reusable source, examples (public benchmarks), tests, and docs. Do not commit the virtual environment,.env, or any generated solver output (.frd,.dat,.sta,.cvg, job directories). Input.inpdecks are source and are committed.

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