Official agent skill

Calculator

Evaluate mathematical expressions and unit conversions. An agent skill from NVIDIA/SkillEvaluator.

OfficialApache-2.0Auto-check passedAgent Workflows

Install Calculator

skills CLI

$ npx skills add NVIDIA/SkillEvaluator --skill calculator -a claude-code

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

GitHub CLI

$ gh skill install NVIDIA/SkillEvaluator calculator --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/NVIDIA/SkillEvaluator.git skills-src && mkdir -p .claude/skills && cp -r skills-src/src/skillevaluator/tier3/reference_skills/calculator .claude/skills/calculator && 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/

Paste into Claude Code

Install the "calculator" agent skill from https://github.com/NVIDIA/SkillEvaluator/tree/main/src/skillevaluator/tier3/reference_skills/calculator into .claude/skills/calculator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "calculator", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/NVIDIA/SkillEvaluator/tree/main/src/skillevaluator/tier3/reference_skills/calculator

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add NVIDIA/SkillEvaluator --skill calculator -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install NVIDIA/SkillEvaluator calculator --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/NVIDIA/SkillEvaluator.git skills-src && mkdir -p .agents/skills && cp -r skills-src/src/skillevaluator/tier3/reference_skills/calculator .agents/skills/calculator && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "calculator" agent skill from https://github.com/NVIDIA/SkillEvaluator/tree/main/src/skillevaluator/tier3/reference_skills/calculator into .agents/skills/calculator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "calculator", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add NVIDIA/SkillEvaluator --skill calculator -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install NVIDIA/SkillEvaluator calculator --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/NVIDIA/SkillEvaluator.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/src/skillevaluator/tier3/reference_skills/calculator .cursor/skills/calculator && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "calculator" agent skill from https://github.com/NVIDIA/SkillEvaluator/tree/main/src/skillevaluator/tier3/reference_skills/calculator into .cursor/skills/calculator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "calculator", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/NVIDIA/SkillEvaluator.git --path src/skillevaluator/tier3/reference_skills/calculator

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add NVIDIA/SkillEvaluator --skill calculator -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install NVIDIA/SkillEvaluator calculator --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/NVIDIA/SkillEvaluator.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/src/skillevaluator/tier3/reference_skills/calculator .gemini/skills/calculator && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "calculator" agent skill from https://github.com/NVIDIA/SkillEvaluator/tree/main/src/skillevaluator/tier3/reference_skills/calculator into .gemini/skills/calculator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "calculator", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install NVIDIA/SkillEvaluator calculator

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add NVIDIA/SkillEvaluator --skill calculator -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/NVIDIA/SkillEvaluator.git skills-src && mkdir -p .github/skills && cp -r skills-src/src/skillevaluator/tier3/reference_skills/calculator .github/skills/calculator && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "calculator" agent skill from https://github.com/NVIDIA/SkillEvaluator/tree/main/src/skillevaluator/tier3/reference_skills/calculator into .github/skills/calculator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "calculator", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add NVIDIA/SkillEvaluator --skill calculator -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install NVIDIA/SkillEvaluator calculator --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/NVIDIA/SkillEvaluator.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/src/skillevaluator/tier3/reference_skills/calculator .opencode/skills/calculator && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "calculator" agent skill from https://github.com/NVIDIA/SkillEvaluator/tree/main/src/skillevaluator/tier3/reference_skills/calculator into .opencode/skills/calculator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "calculator", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: calculator
GitHub stars: 544
Token cost: ~442 tokens
SKILL.md length: 117 words
Files: 3 (incl. scripts)
Skills in repo: 5
Repo updated: Oct 7, 2026
First seen: Oct 7, 2026
Licence: Apache-2.0

At a glance

Evaluate mathematical expressions and unit conversions. An agent skill from NVIDIA/SkillEvaluator.

Works in 3 steps: Read this SKILL.md to understand… → Run scripts/calc.py with the user's… → Return the computed result to the user.
Tasks that involve Agent evaluation and testing
SKILL.md covers Purpose, Agent Instructions, Examples and Limitations, plus 1 more section
Runs Python scripts from its folder; calls python

What it does

Calculator is an agent skill from NVIDIA/SkillEvaluator, published by the product's own GitHub organization. Evaluate mathematical expressions and unit conversions. Handles arithmetic, percentages, exponents, and common unit conversions (temperature, distance, weight). No external dependencies.

Its SKILL.md is about 440 tokens, which your agent loads only when the skill is triggered. The skill folder holds 4 other files, including scripts (for example `evals/evals.json` and `scripts/calc.py`). Compatibility notes: Python 3.10+, no external dependencies

It sits in Agent Workflows, covering Agent evaluation and testing. The repository describes itself as: Multi-tier framework for evaluating AI agent skills with quality gates, semantic overlap detection, synthetic evaluation dataset generation, and live agent evaluation that… The licence is Apache-2.0.

When your agent uses it

Tasks that involve Agent evaluation and testing

Example prompts

“/calculator”

Requirements

Python 3
Compatibility (from SKILL.md): Python 3.10+, no external dependencies

Workflow steps

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

Read this SKILL.md to understand capabilities.
Run scripts/calc.py with the user's expression or conversion.
Return the computed result to the user.

What it can do on your machine

Read from SKILL.md and the folder at commit f32c884. 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
Ships 1 file in scripts/ (Python), which the agent can run.
Shell commands in SKILL.md call:
- python
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.
Compatibility
Python 3.10+, no external dependencies
From compatibility in the SKILL.md frontmatter.

Context cost

Calculator loads about 442 tokens when it runs. Until then it costs about 49 tokens; SKILL.md has 117 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~49
When it runs · the whole SKILL.md, loaded when a task matches: ~442

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); the scripts in this folder are not scanned.

SKILL.md

The full file from NVIDIA/SkillEvaluator at commit f32c884, republished under its Apache-2.0 licence (© NVIDIA). 117 words, ~442 tokens.

Download SKILL.mdSave it as .claude/skills/calculator/SKILL.md (or your agent's skills folder). This skill also uses 2 other files; get the full folder from GitHub.

name: calculator
description: Evaluate mathematical expressions and unit conversions. Handles arithmetic, percentages, exponents, and common unit conversions (temperature, distance, weight). No external dependencies.
compatibility: Python 3.10+, no external dependencies
metadata.author: SkillEvaluator Maintainers <maintainers@example.com>

Calculator

Evaluate math expressions and perform unit conversions from the command line.

Purpose

Provide a safe, sandboxed calculator for arithmetic expressions and common unit conversions without relying on eval() or external services.

Agent Instructions

Read this SKILL.md to understand capabilities.
Run scripts/calc.py with the user's expression or conversion.
Return the computed result to the user.

Examples

Usage

bash

# Arithmetic expressions
python scripts/calc.py "2 + 3 * 4"
python scripts/calc.py "(100 - 25) / 3"
python scripts/calc.py "2 ** 10"

# Percentage calculations
python scripts/calc.py "15% of 200"

# Unit conversions
python scripts/calc.py "100 celsius to fahrenheit"
python scripts/calc.py "5 miles to km"
python scripts/calc.py "10 kg to lbs"

Output

A single line with the result, e.g.:

Result: 14

For conversions:

100 celsius = 212.0 fahrenheit

Limitations

No symbolic algebra (no variables, no equations).
Only supports basic arithmetic operators: +, -, *, /, **, %, parentheses.
Unit conversions are limited to: celsius/fahrenheit, miles/km, kg/lbs, meters/feet.

Troubleshooting

Problem	Fix
`Invalid expression`	Check for unsupported operators or variables
`Unknown conversion`	Use supported units: celsius, fahrenheit, miles, km, kg, lbs, meters, feet

Files

SKILL.md and 2 other files (scripts) in src/skillevaluator/tier3/reference_skills/calculator of NVIDIA/SkillEvaluator.

SKILL.md
evals/evals.json
scripts/calc.py

Open the folder on GitHubat commit f32c884

Compare with similar skills

Calculator 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.

Calculator compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Calculator this skillNVIDIA/SkillEvaluator	544	—	~442	Automated safety check: Pass	Apache-2.0	today
MCP Server Builderanthropics/skills	180k	62 repos	~2.3k	Automated safety check: Pass	Apache-2.0	2 days ago
Diagnosing Superpowers Sessionsobra/superpowers	296k	3 repos	~1.7k	Automated safety check: Pass	MIT	today
Darwin Skill Optimizeralchaincyf/darwin-skill	6.2k	1 repos	~4.7k	Automated safety check: Pass	MIT	19 days ago
Skill Release Gaterohitg00/ai-engineering-from-scratch	65k	—	~1k	Automated safety check: Pass	MIT	today
CodeGraph Agent Evalcolbymchenry/codegraph	73k	—	~950	Automated safety check: Pass	MIT	today

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Questions about Calculator

What does Calculator do?

Evaluate mathematical expressions and unit conversions. An agent skill from NVIDIA/SkillEvaluator. Calculator is an agent skill from NVIDIA/SkillEvaluator, published by the product's own GitHub organization. Evaluate mathematical expressions and unit conversions.

When should I use Calculator?

Calculator fits situations like: tasks that involve Agent evaluation and testing.

How do I install Calculator in Claude Code?

Run `npx skills add NVIDIA/SkillEvaluator --skill calculator -a claude-code`. Or copy the skill folder (src/skillevaluator/tier3/reference_skills/calculator in NVIDIA/SkillEvaluator) into .claude/skills/calculator in your project. Claude Code loads it when a task matches its description.

How do I install Calculator in Codex?

Run `npx skills add NVIDIA/SkillEvaluator --skill calculator -a codex`. Or copy the skill folder (src/skillevaluator/tier3/reference_skills/calculator in NVIDIA/SkillEvaluator) into .agents/skills/calculator in your project. Codex loads it when a task matches its description.

Can I use Calculator 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 NVIDIA/SkillEvaluator --skill calculator -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/calculator, .gemini/skills/calculator, .github/skills/calculator and .opencode/skills/calculator in your project.

What does Calculator need to run?

Going by SKILL.md and its folder, Calculator needs Python for the scripts in its folder and the command-line tools its instructions call (python). Our summary lists: Python 3. Compatibility (from SKILL.md): Python 3.10+, no external dependencies.

Does Calculator 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 Calculator 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. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.

What licence does Calculator use?

Calculator is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Calculator use?

About 442 tokens (SKILL.md is roughly 1.8k 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 Calculator?

Skills that share tags, products or a category with Calculator: MCP Server Builder (anthropics/skills, 180k stars), Diagnosing Superpowers Sessions (obra/superpowers, 296k stars), Darwin Skill Optimizer (alchaincyf/darwin-skill, 6.2k stars) and Skill Release Gate (rohitg00/ai-engineering-from-scratch, 65k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Calculator?

NVIDIA (a GitHub organization, an official publisher) maintains it in NVIDIA/SkillEvaluator, which has 544 GitHub stars. The repository holds 5 skills in this directory. The repository was last updated on October 7, 2026.

Source: NVIDIA/SkillEvaluator on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Calculator

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Compatibility

Context cost

Safety

SKILL.md

Calculator

Purpose

Agent Instructions

Examples

Usage

Output

Limitations

Troubleshooting

Files

Compare with similar skills

Similar skills

More from NVIDIA/SkillEvaluator

Related

Questions about Calculator