What is comsol-mcp CLAUDE.md?

Development instructions for a bridge between coding agents and a running COMSOL Multiphysics server. COMSOL is software for simulating physical systems such as structures, fluids, and heat.

Use them when developing, testing, or maintaining the COMSOL connection, model loading, parameter handling, expressions, studies, and workflow tools.

They explain the project layout, how the connection works, and how to build and run the bridge, reducing guesswork when changing the code.

How Ching-Chiang/comsol-mcp configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to Ching-Chiang/comsol-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/Ching-Chiang/comsol-mcp/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/Ching-Chiang/comsol-mcp

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

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Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

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Per session 1,127 This file is loaded in full into every session.

When invoked 1,127 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin 95% copy Near-identical to another mod in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.01127	$0.01127
Opus 5.5	$0.00451	$0.00451
Sonnet 5.5	$0.00225	$0.00225
Haiku 4.5	$0.00113	$0.00113

Measured 2mo ago against content hash abb688b97cff, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

comsol-mcp CLAUDE.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

This is a copy

95% identical to comsol-mcp AGENTS.md — 2 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

CLAUDE.md · 100 lines

How it starts

The opening of the file, as written. The whole thing — 100 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md — comsol-server-mcp

Project Overview

COMSOL MCP Server (comsol-mcp v0.1.9). An attach-first MCP bridge that connects to a running COMSOL Multiphysics Server, loads a main .mph model, locks it, and drives the same server-side model that a COMSOL Desktop client visualizes in real time.

Architecture

comsol_mcp/
  __init__.py              # from .mcp_server import main
  _server.py               # FastMCP instance, global state, constants, classification sets
  _state.py                # Workflow persistence, status/operations logging, path/port utils, _run_tool
  _connection.py           # Disconnect, client shell, _require_client
  _model.py                # Model adopt/prune, visible-main lock mechanism
  _model_ops.py            # Pure helpers: parameters, expressions, core metrics, tree, geometry
  _tools_connection.py     # server_info, check_server_port, server_start, server_connect, server_disconnect
  _tools_workflow.py       # Workflow tools, visible-main lifecycle, model_tree, run_study
  _tools_model.py          # model_create, model_load, prune_loaded_models
  _tools_params.py         # get_parameters, set_parameters, evaluate_expressions, get_core_metrics
  _tools_geometry.py       # ensure_component/geometry/mesh, create/update/delete/run_feature
  _tools_snapshot.py       # run_visible_main_iteration, save_main_model_snapshot, commit_current_main_model, save_model
  mcp_server.py            # Thin entrypoint: imports + register + main()

35 MCP tools registered via mcp.add_tool() in each module's register() function.

Build and Run

pip install -e .          # install in editable mode
pip install -e ".[dev]"   # with pytest
python -m comsol_mcp.mcp_server   # start MCP server
pytest                           # run tests (40 tests, all without COMSOL)

Module Dependency Graph

_server.py  (no deps)
  -> _state.py
    -> _connection.py
      -> _model.py
        -> _model_ops.py (no global state deps)

Tool modules depend on the above:
  _tools_connection -> _server, _state, _connection, _model
  _tools_workflow   -> _server, _state, _model, _tools_connection (cross-module call)
  _tools_model      -> _server, _state, _model
  _tools_params     -> _state, _model, _model_ops
  _tools_geometry   -> _state, _model, _model_ops
  _tools_snapshot   -> _server, _state, _model, _tools_params (cross-module call)

Read the full file on GitHub · 100 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2mo ago First seen · 100 lines · 1,127 tokens per session scan A abb688b97cff

Subscribe to this mod's changes

comsol-mcp CLAUDE.md is an instructions file published in the GitHub repository Ching-Chiang/comsol-mcp (14 stars, last pushed 5mo ago), licensed MIT. It adds 1,127 tokens to every session, about $0.0045 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 95% identical to comsol-mcp AGENTS.md, differing in 2 lines, and is treated as a copy.

Scientific

comsol-mcp CLAUDE.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
comsol-mcp CLAUDE.mdChing-Chiang/comsol-mcp	Instructions file	14	5mo ago	MIT	A	1,127	Claude Code
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	yesterday	MIT	A	7,461	Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	MIT	A	4,680	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	274k	2d ago	MIT	A	4,313	Codex, OpenCode

comsol-mcp: Instructions file for Claude Code