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ultracave

100 / 100 · Low risk

Fine to try.

By ShaftHQ/SHAFT_ENGINE (GitHub) · coding · 421 stars · scanned at commit b187063

Caveman at maximum compression: fragments, one word when one word is enough, each fact once. Invoke only with /ultracave or /caveman ultra. Stays on until "stop caveman" or "normal mode".

Works with any agent that supports SKILL.md skills.

What this skill can do

We found nothing in the files we read that matches our rules. That does not prove the skill is safe: see the limits of static scanning.

Install

Paste this into your terminal. It downloads exactly the version we scanned, not whatever is newest.

if [ -e ~/.agents/skills/'ultracave' ] || [ -L ~/.agents/skills/'ultracave' ]; then echo 'A skill folder named ultracave already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/ShaftHQ/SHAFT_ENGINE' "$d" && git -C "$d" checkout --quiet 'b18706398102990403d74b84e6811296c4a69031' -- 'chaos-engine/vendor/caveman/skills/ultracave' && mkdir -p ~/.agents/skills && cp -R "$d"/'chaos-engine/vendor/caveman/skills/ultracave' ~/.agents/skills/'ultracave' && rm -rf "$d"; fi

Codex reads ~/.agents/skills directly. For Claude Code, Cursor, Copilot, Gemini CLI, Antigravity or OpenCode, also link it. For Claude Code: ln -s ~/.agents/skills/'ultracave' ~/.claude/skills/'ultracave' (other agents: ~/.cursor/skills, ~/.copilot/skills, ~/.gemini/skills, ~/.gemini/config/skills, ~/.config/opencode/skills). Or install through the finder skill, which does both.

Badge for your README

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Score history

Also found in

Identical copies of this skill exist at:

• iTestFlow/iTestFlow-Agent/.chaos-engine/vendor/caveman/skills/ultracave