/caveman — Claude Code Skill
Unbox Digital — Free Claude Code Skill

/caveman
Few word.
Do trick.

A Claude Code skill that cuts output tokens by up to 75% by stripping filler words, pleasantries, and hedging — while keeping full technical accuracy. Inspired by Kevin from The Office.

Before vs after
Normal Claude
"The reason your React component is re-rendering is likely because you're creating a new object reference on each render cycle. When you pass an inline object as a prop, React's shallow comparison sees it as a different object every time, which triggers a re-render. I'd recommend using useMemo to memoize the object."
69 tokens
Caveman full mode
New object ref each render. Inline object prop = new ref = re-render. Wrap in useMemo.
19 tokens — 72% reduction
75%
Output token reduction
39%
Cost saving vs "be concise"
26%
Accuracy improvement on benchmarks
Open Source — Free
JuliusBrussee/caveman
github.com/JuliusBrussee/caveman
View on GitHub →
Installation
claude plugin marketplace add JuliusBrussee/caveman && claude plugin install caveman@caveman
Recommended for Claude Code — installs the skill plus auto-loading hooks.
npx skills add JuliusBrussee/caveman
For any other agent — Cursor, Windsurf, Copilot, Cline, and 40+ more.
01
Install for Claude Code (recommended)
▼

Run both commands in your terminal:

claude plugin marketplace add JuliusBrussee/caveman
claude plugin install caveman@caveman

This installs the skill plus auto-loading hooks so Caveman activates automatically at the start of every Claude Code session.

02
Install for other agents
▼

Use npx skills with an agent flag:

npx skills add JuliusBrussee/caveman -a cursor
npx skills add JuliusBrussee/caveman -a windsurf
npx skills add JuliusBrussee/caveman -a github-copilot
npx skills add JuliusBrussee/caveman -a cline
npx skills installs the skill file only — it does not auto-activate. For always-on, add the snippet from the README to your agent's rules or system prompt.
03
Activate and use
▼

Once installed, activate by typing in your agent:

/caveman
/caveman lite
/caveman ultra

To turn it off:

stop caveman
With Claude Code plugin install, Caveman auto-activates at session start — no manual command needed.
04
Compress your CLAUDE.md
▼

Caveman can also compress your existing memory files to cut input tokens by up to 46%:

/caveman-compress path/to/your/CLAUDE.md

It strips filler from the file itself, preserves all headings, code blocks, URLs, and commands, and saves a backup before overwriting.

Requires Python 3.10+.
Intensity modes
/caveman lite
Drops filler, keeps full sentences. Professional but tight.
/caveman full
Default. Fragments OK, no articles, short synonyms. Classic caveman.
/caveman ultra
Abbreviate everything, strip conjunctions, arrows for causality.
/caveman wenyan
Classical Chinese characters. Most token-efficient writing system ever invented.
/caveman-commit
Terse git commits. Conventional Commits format, 50 char max.
/caveman-review
One-line code review comments. L42: bug: user null. Add guard.
Supported agents
Agent Install command
Claude Code claude plugin marketplace add JuliusBrussee/caveman
Cursor npx skills add JuliusBrussee/caveman -a cursor
Windsurf npx skills add JuliusBrussee/caveman -a windsurf
GitHub Copilot npx skills add JuliusBrussee/caveman -a github-copilot
Cline npx skills add JuliusBrussee/caveman -a cline
Gemini CLI gemini extensions install https://github.com/JuliusBrussee/caveman
Any other npx skills add JuliusBrussee/caveman
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