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Agent skill

Calculix Modal Analysis

by Cai-aa in Cai-aa/CAE-Agent-Hub

Workflow skill for CalculiX modal analysis (FREQUENCY steps) — natural frequencies and mode shapes via the CalculiX MCP.

MITAuto-check passed

Install Calculix Modal Analysis

skills CLI
$ npx skills add Cai-aa/CAE-Agent-Hub --skill calculix-modal-analysis -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install Cai-aa/CAE-Agent-Hub calculix-modal-analysis --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/Cai-aa/CAE-Agent-Hub.git skills-src && mkdir -p .claude/skills && cp -r skills-src/Skill/calculix/calculix-modal-analysis .claude/skills/calculix-modal-analysis && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
calculix-modal-analysis
GitHub stars
1k
Token cost
~749 tokens
SKILL.md length
347 words
Files
1
Skills in repo
57
Repo updated
First seen
Licence
MIT

At a glance

Workflow skill for CalculiX modal analysis (FREQUENCY steps) — natural frequencies and mode shapes via the CalculiX MCP.

  • Works in 5 steps: Confirm the deck has *DENSITY under its… → Confirm the step is *FREQUENCY with the… → run_solver_tool — submit the deck. Note:… → …
  • An agent must extract natural frequencies
  • SKILL.md covers When to Use, Workflow, Rules and Example
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Calculix Modal Analysis is an agent skill from Cai-aa/CAE-Agent-Hub. Workflow skill for CalculiX modal analysis (FREQUENCY steps) — natural frequencies and mode shapes via the CalculiX MCP. readresults returns the frequency table; exportresults with mode=N renders that mode shape in the browser viewer. Use when an agent must extract natural frequencies, check resonance margins, or visualize mode shapes on an open-source solver.

Its SKILL.md is about 750 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It works with Model Context Protocol. The licence is MIT.

When your agent uses it

  • An agent must extract natural frequencies
  • Check resonance margins
  • Visualize mode shapes on an open-source solver

Example prompts

  • “/calculix-modal-analysis”

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

  1. Confirm the deck has *DENSITY under its *MATERIAL — frequencies need
  2. Confirm the step is *FREQUENCY with the wanted mode count on its data
  3. run_solver_tool — submit the deck. Note: a *FREQUENCY run writes a
  4. read_results_tool — returns frequencies as
  5. export_results_tool with mode=N — writes result_mesh.json holding

What it can do on your machine

Read from SKILL.md and the folder at commit 194ef49. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Calculix Modal Analysis loads about 749 tokens when it runs. Until then it costs about 97 tokens; SKILL.md has 347 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~97
When it runs · the whole SKILL.md, loaded when a task matches
~749

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from Cai-aa/CAE-Agent-Hub at commit 194ef49, republished under its MIT licence (© Cai-aa). 347 words, ~749 tokens.

Download SKILL.mdSave it as .claude/skills/calculix-modal-analysis/SKILL.md (or your agent's skills folder).
name
calculix-modal-analysis
description
Workflow skill for CalculiX modal analysis (*FREQUENCY steps) — natural frequencies and mode shapes via the CalculiX MCP. read_results returns the frequency table; export_results with mode=N renders that mode shape in the browser viewer. Use when an agent must extract natural frequencies, check resonance margins, or visualize mode shapes on an open-source solver.

CalculiX Modal Analysis

Free-vibration eigenanalysis on a CalculiX deck: a *FREQUENCY step requests N eigenpairs; ccx prints the eigenvalue table and per-mode eigenvectors to the .dat, so both frequencies and mode shapes parse from text (no .frd needed).

When to Use

Use when an agent must extract natural frequencies, check resonance/vibration margins, or visualize mode shapes on a CalculiX model. Driven by the same MCP tools as static runs (run_solver → read_results → export_results).

Not for: static stress/deflection (use calculix-fem), transient/dynamic response (not yet supported), or sizing optimization (calculix-sizing-optimization).

Workflow

  1. Confirm the deck has *DENSITY under its *MATERIAL — frequencies need mass; without density ccx fails the eigenvalue solve.
  2. Confirm the step is *FREQUENCY with the wanted mode count on its data line, and *NODE PRINT, NSET=<all> / U so eigenvectors reach the .dat. No load is applied (free vibration); keep the *BOUNDARY clamp set.
  3. run_solver_tool — submit the deck. Note: a *FREQUENCY run writes a header-only .sta (no increments in an eigenvalue solve); success accepts a non-empty .dat instead, so this is normal, not a failure.
  4. read_results_tool — returns frequencies as [{mode, eigenvalue, freq_rad_s, freq_hz}] and n_modes (a doubly symmetric section gives degenerate pairs — f1 = f2 — which is expected).
  5. export_results_tool with mode=N — writes result_mesh.json holding that mode's eigenvector as a stress-free displacement field; the viewer renders the mode shape with its usual auto-scaled deformation.

Rules

  • Units follow the .inp (commonly mm-t-s-MPa → frequencies in Hz).
  • Eigenvectors are mass-normalized; their magnitude carries no physical displacement meaning — only the shape does. The viewer auto-scales.
  • Fully-integrated C3D8 hexes shear-lock in bending: ccx frequencies run ~5-10% ABOVE the Euler-Bernoulli hand calc. For tight margins, refine the mesh through the thickness (or switch element type) and report the gap.
  • Hand-calc check for a clamped-free bar: f_n = (beta_n^2 / 2pi) * sqrt(E I / (rho A L^4)), beta_1 = 1.8751.

Example

MCP/CalculiX/examples/cantilever_modal.inp is the public cantilever benchmark with a 5-mode *FREQUENCY step. ccx gives f1 = f2 ~ 502 Hz (degenerate bending pair on the square section) vs the Euler-Bernoulli hand calc ~ 464 Hz (+8%, C3D8 shear locking). Mode 1 exports straight into the viewer as the classic half-sine bend.

© Cai-aa, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in Skill/calculix/calculix-modal-analysis of Cai-aa/CAE-Agent-Hub.

Open the folder on GitHubat commit 194ef49

Compare with similar skills

Calculix Modal Analysis next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

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Works with

Questions about Calculix Modal Analysis

What does Calculix Modal Analysis do?

Workflow skill for CalculiX modal analysis (FREQUENCY steps) — natural frequencies and mode shapes via the CalculiX MCP. Calculix Modal Analysis is an agent skill from Cai-aa/CAE-Agent-Hub. Workflow skill for CalculiX modal analysis (FREQUENCY steps) — natural frequencies and mode shapes via the CalculiX MCP.

When should I use Calculix Modal Analysis?

Calculix Modal Analysis fits situations like: an agent must extract natural frequencies; check resonance margins; visualize mode shapes on an open-source solver.

How do I install Calculix Modal Analysis in Claude Code?

Run `npx skills add Cai-aa/CAE-Agent-Hub --skill calculix-modal-analysis -a claude-code`. Or copy the skill folder (Skill/calculix/calculix-modal-analysis in Cai-aa/CAE-Agent-Hub) into .claude/skills/calculix-modal-analysis in your project. Claude Code loads it when a task matches its description.

How do I install Calculix Modal Analysis in Codex?

Run `npx skills add Cai-aa/CAE-Agent-Hub --skill calculix-modal-analysis -a codex`. Or copy the skill folder (Skill/calculix/calculix-modal-analysis in Cai-aa/CAE-Agent-Hub) into .agents/skills/calculix-modal-analysis in your project. Codex loads it when a task matches its description.

Can I use Calculix Modal Analysis in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add Cai-aa/CAE-Agent-Hub --skill calculix-modal-analysis -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/calculix-modal-analysis, .gemini/skills/calculix-modal-analysis, .github/skills/calculix-modal-analysis and .opencode/skills/calculix-modal-analysis in your project.

What does Calculix Modal Analysis need to run?

SKILL.md names no scripts, command-line tools or credentials: Calculix Modal Analysis is instructions for the agent only.

Does Calculix Modal Analysis access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Calculix Modal Analysis safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Calculix Modal Analysis use?

Calculix Modal Analysis is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Calculix Modal Analysis use?

About 749 tokens (SKILL.md is roughly 3k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Calculix Modal Analysis?

Skills that share tags, products or a category with Calculix Modal Analysis: MCP Server Builder (anthropics/skills, 180k stars), MCP Server Builder (shareAI-lab/learn-claude-code, 78k stars), MCP Integration for Plugins (anthropics/claude-plugins-official, 38k stars) and Figma use_figma Plugin API Rules (warpdotdev/warp, 65k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Calculix Modal Analysis?

Cai-aa (a GitHub user) maintains it in Cai-aa/CAE-Agent-Hub, which has 1,003 GitHub stars. The repository holds 57 skills in this directory. The repository was last updated on September 30, 2026.

Source: Cai-aa/CAE-Agent-Hub on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.