A concise communication mode that shortens replies while keeping technical details, code, commands, and exact error messages.

It helps produce shorter technical explanations, commands, code, and error reports.

It reduces unnecessary text without removing information needed to work on software problems.

caveman — Plugin for Gemini CLI by JuliusBrussee

About the project

caveman is a skill and proxy for coding agents that shortens unnecessary explanatory prose so agents use fewer tokens while leaving code, commands, paths, and error messages unchanged. It is for people using coding agents who want terse responses and lower token use, including with Claude-based workflows. The catalogue entries contain its skills, commands, agents, instructions, and plugins.

JuliusBrussee/caveman · 119,438 stars · on GitHub · docs.caveman.so

Install

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.

Clone the repo

git clone --depth 1 https://github.com/JuliusBrussee/caveman

Made for: Gemini CLI.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/plugins/juliusbrussee/caveman/gemini-extension/github.svg)](https://agentmods.dev/plugins/juliusbrussee/caveman/gemini-extension)

Your own site

<a href="https://agentmods.dev/plugins/juliusbrussee/caveman/gemini-extension"><img src="https://agentmods.dev/badge/plugins/juliusbrussee/caveman/gemini-extension/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.

Your own site · 80×15

<a href="https://agentmods.dev/plugins/juliusbrussee/caveman/gemini-extension"><img src="https://agentmods.dev/badge/plugins/juliusbrussee/caveman/gemini-extension.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session not measured What this adds to a session before it is invoked.

When invoked not measured Not applicable: nothing here is loaded into a session.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Security

Grade A, and why

caveman scanned grade A with 0 findings 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 5d ago.

The scan reads gemini-extension.json. This mod also ships 6 executable files (scripts/build-release-binaries.mjs, scripts/install-local-cli.ps1, scripts/install-local-cli.sh, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

gemini-extension.json · 7 lines

What it actually says

{
  "name": "caveman",
  "description": "Ultra-compressed communication mode. Shortens replies while preserving technical substance, code, commands, and exact errors.",
  "version": "4.1.0",
  "contextFileName": "GEMINI.md"
}

Files

What ships with it

6 files beside gemini-extension.json 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.

Changes

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.

5d ago Changed d98345f9b6cc
1mo ago Changed a32474233c61
1mo ago Changed cae70729becb
1mo ago Changed 7a4ebcd8ef7e
1mo ago Changed e7343f95ce81
1mo ago Changed d95cf14c0132
1mo ago Changed 9ce7bfba0dd4
2mo ago First seen · 7 lines scan A 5c46a9e23622

Subscribe to this mod's changes

caveman is a plugin published in the GitHub repository JuliusBrussee/caveman (119,438 stars, last pushed today), licensed Apache-2.0. Its token cost is not measured: this kind of file is read by the harness, not the model. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-07.

Claude Code LLM Productivity ai anthropic caveman claude

caveman next to 6 plugins from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
cavemanJuliusBrussee/caveman	Plugin	119k	today	Apache-2.0	A	—	Gemini CLI
claw-moLeeJuOh/claude-code-zero	Plugin	52	1mo ago	MIT	A	—	Claude Code
claude-ecosup3x/claude-code-eco	Plugin	42	2mo ago	MIT	A	—	Claude Code
pongdavila7/claude-code-templates	Plugin	33k	yesterday	MIT	A	—	Claude Code
neurodocktlennon-ie/neurodock	Plugin	20	1mo ago	AGPL-3.0	A	—	Claude Code
humanizerblader/humanizer	Plugin	68k	3d ago	MIT	A	—	Claude Code
claude-plugins-official marketplaceanthropics/claude-plugins-official	Plugin	47k	today	Apache-2.0	A	—	Claude Code