cst-mcp 🛰️

MCP server for CST Studio Suite — THz metamaterial absorber design, unit-cell automation & Floquet port control

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✨ What is this?

cst-mcp turns CST Studio Suite into an AI-controllable electromagnetic design lab through the Model Context Protocol. Point Claude/Cursor/DSH at it and drive full-wave simulations conversationally:

• 🧱 One-shot unit-cell builder — MIM absorber stacks (square ring / patch / circular ring), auto-materializes Floquet ports and sets 1 mode by script (~50× faster per point, no GUI clicks)
• 🎛️ Floquet port suite with the correct 2026 API — mode count / scan angles / polarization, all scriptable (SetNumberOfModesConsidered, uppercase "Zmax" …). Most public examples use a renamed legacy API that silently fails on CST 2026 — this server is verified against CST 2026.
• ⚡ Absorber quick-design workflow — set params → solve → full 200-pt absorption spectrum + A_peak / in-band A_min / ≥90 % bandwidth in one tool call
• 🔁 Checkpoint-resume batch runner — config fingerprints, PID lock, point-level watchdog that survives solver hangs and COM channel death (survived 2100+ unattended points)
• 📈 Surrogate-model hooks — millisecond spectrum prediction & inverse design TopK when a trained pipeline is provided
• 🩺 Self-diagnosis — CST error-log tail tooling and session restart tools for unattended runs

🚀 Quick start

pip install -r requirements.txt          # mcp>=1.2,<2  (2.x removed FastMCP path!)
set PYTHONPATH=C:\PATH\TO\CST\AMD64\python_cst_libraries
python src/cst_absorber_mcp.py           # stdio MCP server

Register with your MCP client:

{
  "mcpServers": {
    "cst-mcp": {
      "command": "C:\\CST\\Python\\python.exe",
      "args": ["path/to/src/cst_absorber_mcp.py"],
      "env": { "PYTHONPATH": "C:\\CST\\AMD64\\python_cst_libraries",
               "CST_MCP_WORKDIR": "D:\\cst_mcp_work" }
    }
  }
}

🧰 Tools (23)

Family	Tools
Health	cst_status cst_log_tail cst_session_restart
Project	cst_unitcell_build cst_project_open cst_param_set cst_param_list
Floquet ports	cst_floquet_set_modes cst_floquet_set_angles cst_floquet_set_polarization cst_port_modes_read
Simulate	cst_solve cst_get_absorption cst_read_sparams_offline cst_export_tree_csv
Absorber flow	absorber_quick_design absorber_batch absorber_progress
Surrogate	absorber_surrogate_predict absorber_inverse_design
Docs	doc_export_step doc_export_structure_png

(see docstrings inside src/cst_absorber_mcp.py for exact signatures)

📐 Verified reference results (real CST 2026 runs)

Case	Result
Metal-ring narrowband (P65/L50/t8/h12/Rs10 Ω/sq)	A_peak = 0.87 @ 1.08 THz
Script-set 1-mode vs default 18 modes	~10 s/pt vs ~462 s/pt
Unattended batch	2099 points, auto-heal from solver hangs

📚 docs/

• reflect_tables.json — reflected method tables of key COM objects (model3d 387 methods, FDSolver 112, Material 589, Port 75, FloquetPort 25 …) discovered on CST 2026
• results_api_table.json — offline S-parameter reading API surface

⚠️ Notes

• Windows only (COM automation); CST license required.
• Keep project paths ASCII-only — non-ASCII paths break project.save() (encoding bug).
• Use mcp SDK 1.x; v2.0 dropped the FastMCP import path.

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中文简介

把 CST Studio Suite 变成 AI 可对话操控的电磁设计实验室：一句话建单元胞（方环/贴片/圆环 MIM）、 脚本化设置 Floquet 端口模数/扫描角/极化（CST2026 正确 API，全网首发实测）、一键求解并返回 200 点吸收谱与指标、断点续跑批量仿真（经 2100+ 点无人值守验证）、可选代理模型毫秒级预测与逆向设计。 安装与配置见上方英文区；工具签名见源码 docstring。

License

MIT — see LICENSE。CST Studio Suite 是 Dassault Systèmes 产品，本项目仅通过官方 Python 接口驱动。