Caveman

by Julius Brussee

A skill that makes your agent terse, plus a proxy that shrinks the large files it reads.

111.1 k stars GitHub Apache-2.0 FreeOpen sourceLocal

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What it does

The skill shortens replies: modest measured gain (−8.5% at JetBrains, far below the advertised −65%)
The optional proxy shrinks heavy files (CSV, logs, JSON): −33% input tokens over 54 runs, per the repo
Designed for technical English: in French the replies become harder to read

! Take the numbers with care: the repo's figure comes from its own tests; JetBrains' independent trial (July 2026) measured less. Measure on your own sessions before keeping it.

Install it

Requirements: Node.js 18+; Claude Code, Codex, Cursor, Gemini CLI…

In Claude Code: add the source

/plugin marketplace add JuliusBrussee/caveman

Install the plugin

/plugin install caveman@caveman

The prompt for your agent

Paste it into your coding agent: it checks the requirements and installs it for you.

Claude CodeCodexCursorGemini CLIopencode

Prompt

Install Caveman (https://github.com/JuliusBrussee/caveman) on my machine.
1. Check the requirements: Node.js 18+; Claude Code, Codex, Cursor, Gemini CLI…. If anything is missing, tell me before installing anything.
2. Follow the official method:
- In Claude Code: add the source: /plugin marketplace add JuliusBrussee/caveman
- Install the plugin: /plugin install caveman@caveman
3. Check that it works, then explain how to launch it and where to start.

Always review what your agent is about to run, especially install commands.