Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add Abhinavbwj/Claude-skills-for-Computational-Designers --skill cd-calculatorgit clone --depth 1 https://github.com/Abhinavbwj/Claude-skills-for-Computational-DesignersWrote 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.
[](https://agentmods.dev/skills/abhinavbwj/claude-skills-for-computational-designers/cd-calculator)<a href="https://agentmods.dev/skills/abhinavbwj/claude-skills-for-computational-designers/cd-calculator"><img src="https://agentmods.dev/badge/skills/abhinavbwj/claude-skills-for-computational-designers/cd-calculator/github.svg" alt="Measured on agentmods" height="20"></a>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.
<a href="https://agentmods.dev/skills/abhinavbwj/claude-skills-for-computational-designers/cd-calculator"><img src="https://agentmods.dev/badge/skills/abhinavbwj/claude-skills-for-computational-designers/cd-calculator.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00030 | $0.05800 |
| Opus 5.5 | $0.00012 | $0.02320 |
| Sonnet 5.5 | $0.00006 | $0.01160 |
| Haiku 4.5 | $0.00003 | $0.00580 |
Grade A, and why
cd-calculator scanned grade A with 1 finding 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 1mo 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.
Runs shell commandslowCapability
Expected in a hook, worth knowing in a rule or an instructions file.
result = subprocess.run( Copies of this mod
1 near-identical copy found in the catalogue:
- cd-calculator — 100% identical, 0 lines differ
How it starts
The opening of the file, as written. The whole thing — 635 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Computational Design Calculator
Calculator Overview
This skill provides 7 production-grade Python calculators purpose-built for computational design workflows in Architecture, Engineering, and Construction (AEC). Each calculator is a standalone command-line tool that accepts domain-specific parameters and returns precise, well-formatted results.
All calculators share common design principles:
- Human-readable output by default with clear section headers, formatted tables, and summary statistics.
--jsonflag on every calculator for structured machine-readable output, enabling pipeline integration with parametric design tools, Grasshopper scripts, Dynamo graphs, or custom automation.- Strict input validation with meaningful error messages that guide the user toward correct usage.
- SI units throughout (millimeters for geometry, kilonewtons for forces, degrees for angles) with Imperial equivalents noted where relevant.
- Deterministic calculations based on published engineering formulas (Eurocode, ASCE, ASHRAE) so results can be cross-checked and audited.
Calculator Index
| # | Calculator | Script | Primary Domain |
|---|---|---|---|
| 1 | Geometry Calculator | geometry_calculator.py |
Cross-section properties |
| 2 | Structural Checker | structural_checker.py |
Member sizing & verification |
| 3 | Solar Calculator | solar_calculator.py |
Solar position & radiation |
| 4 | Panel Optimizer | panel_optimizer.py |
Facade rationalization |
| 5 | Mesh Analyzer | mesh_analyzer.py |
Mesh quality & topology |
| 6 | Material Estimator | material_estimator.py |
Quantity takeoff & carbon |
| 7 | Fabrication Calculator | fabrication_calculator.py |
CNC / 3D print / laser costing |
Directory Structure
cd-calculator/
SKILL.md # This file
references/
formulas.md # Complete formula reference
scripts/
geometry_calculator.py # Cross-section geometry
structural_checker.py # Beam/column/deflection checks
solar_calculator.py # Solar position & radiation
panel_optimizer.py # Panel clustering & waste
mesh_analyzer.py # OBJ mesh quality analysis
material_estimator.py # Material quantity takeoff
fabrication_calculator.py # Fabrication time & cost
What ships with it
8 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
- references/formulas.md 21 KB
- scripts/fabrication_calculator.py 20 KB runs code
- scripts/geometry_calculator.py 19 KB runs code
- scripts/material_estimator.py 15 KB runs code
- scripts/mesh_analyzer.py 18 KB runs code
- scripts/panel_optimizer.py 10 KB runs code
- scripts/solar_calculator.py 20 KB runs code
- scripts/structural_checker.py 18 KB runs code
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.
- 1mo ago First seen · 635 lines · 30 tokens per session scan A 7361e868b7b7
cd-calculator is a skill published in the GitHub repository Abhinavbwj/Claude-skills-for-Computational-Designers (224 stars, last pushed 7mo ago), licensed MIT. It adds 30 tokens to every session and 5,800 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 1 finding (runs shell commands). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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