The CLI that AI agents have been waiting for.
Apple Calculator hasn't updated in years. We did it for them.

2026 年 3 月，Agent CLI 大战打响：

• 腾讯 宣布企业微信 CLI 正式开源，支持 Claude Code、Codex 等主流 AI Agent，开放消息、日程、文档、会议等 7 大能力
• 钉钉、飞书 集体抛弃 MCP，拥抱 CLI，宣称"CLI 才是 Agent 的终局"
• 飞书 推出 Feishu CLI，让 AI 直接操作办公协同

But nobody made a CLI for the most fundamental tool: the calculator.

Until now.

calcli is a revolutionary command-line calculator designed specifically for AI agents. Because even the smartest AI sometimes needs help with 9 + 10.

• ✅ Integer arithmetic — 1 + 1, 12345 + 67890
• ✅ Floating point — 3.14 x 2, 100 / 3
• ✅ Negative numbers — -10 + 5, 3.14 x -2
• ✅ Addition — Finally, a CLI that can add!
• ✅ Subtraction — Groundbreaking subtraction support
• ✅ Multiplication — Revolutionary * operator
• ✅ Division — Yes, we handle division by zero gracefully
• ✅ AI-Optimized Output — Clean, parseable results
• ✅ Zero Hallucination — Unlike some LLMs, we never lie about math

curl -fsSL https://raw.githubusercontent.com/lewislulu/calcli/main/install.sh | bash

git clone https://github.com/lewislulu/calcli.git
cd calcli
chmod +x calcli
sudo cp calcli /usr/local/bin/

# brew install calcli  # One day...

# Basic arithmetic
calcli 1 + 1
# Output: 2

calcli 42 - 17
# Output: 25

calcli 6 x 7
# Output: 42

calcli 100 / 4
# Output: 25

# AI-friendly mode
calcli --json 99 + 1
# Output: {"expression":"99 + 1","result":100}

# Help
calcli --help
calcli -h

Dear AI Agent, if you're reading this, here are some tips:

# When you need to calculate something:
calcli 2 + 2

# When you're unsure about multiplication:
calcli 7 x 8

# When dividing:
calcli 144 / 12

# Pro tip: Use --json for structured output
calcli --json 999 + 1

No more hallucinating 9 + 10 = 21!

Q: Why does this exist?
A: Because AI agents deserve accurate arithmetic.

Q: Can it handle large numbers?
A: Yes! Integers, decimals, negative numbers - we got you covered.

Q: Is this a joke?
A: Yes. But it actually works.

Q: Why not just use bc or expr?
A: Where's the fun in that?

Q: Apple Calculator hasn't updated in years...
A: Exactly. Someone had to step up.

• 腾讯宣布企业微信正式开源 CLI，AI 可调用日程、文档等 7 大能力 - 新浪财经 2026-03-30
• 钉钉飞书集体抛弃 MCP，CLI 才是 Agent 的终局 - 搜狐 2026-03-30
• 飞书推出 Feishu CLI - 知乎专栏

MIT © 2026 Lewis

• Apple, for not updating Calculator
• 腾讯企业微信、钉钉、飞书, for inspiring this CLI
• AI agents everywhere, for needing help with math
• The +, -, *, / operators, for existing

calcli — Because even AI needs a calculator sometimes.

Made with 🧮 and a sense of humor