ultracave

95 / 100 · Low risk

Fine to try. Some of what it can do is expected: a coding skill usually runs build and test commands.

By JuliusBrussee/caveman (GitHub) · coding · 118,803 stars · scanned at commit 3dc497a

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

Runs commands on your computer

The author does not mention this. It runs automatically when the plugin is installed. Expected for a coding skill.

Found in 5 places.

.claude-plugin/plugin.json, line 15"command": "command -v node >/dev/null 2>&1 || exit 0; HOOK_ROOT=$(printf %s \"${CLAUDE_PLUGIN_ROOT}\" | sed 's|^/\$[a-zA-Z]\$/|\\1:/|'); node \"$HOOK_ROOT/sr
.claude-plugin/plugin.json, line 27"command": "command -v node >/dev/null 2>&1 || exit 0; HOOK_ROOT=$(printf %s \"${CLAUDE_PLUGIN_ROOT}\" | sed 's|^/\$[a-zA-Z]\$/|\\1:/|'); node \"$HOOK_ROOT/sr
.claude-plugin/plugin.json, line 39"command": "command -v node >/dev/null 2>&1 || exit 0; HOOK_ROOT=$(printf %s \"${CLAUDE_PLUGIN_ROOT}\" | sed 's|^/\$[a-zA-Z]\$/|\\1:/|'); node \"$HOOK_ROOT/sr

Show 2 more

.claude-plugin/plugin.json, line 51"command": "command -v node >/dev/null 2>&1 || exit 0; HOOK_ROOT=$(printf %s \"${CLAUDE_PLUGIN_ROOT}\" | sed 's|^/\$[a-zA-Z]\$/|\\1:/|'); node \"$HOOK_ROOT/sr
hooks/hooks-cursor.json, line 6"command": "node \"${CURSOR_PLUGIN_ROOT}/src/hooks/caveman-host-session-start.js\" cursor",

Other copies in this repository

JuliusBrussee/caveman has 1 more folder with a skill named ultracave. This page shows the lowest-scoring copy.

plugins/caveman/skills/ultracave 100/100 · Low risk

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=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/JuliusBrussee/caveman' "$d" && git -C "$d" checkout --quiet '3dc497a7f858c774d6e15b25e8c6120ef3a0eda8' -- 'skills/ultracave' && mkdir -p ~/.agents/skills && cp -R "$d"/'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.

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Score history

Date	Version	Score
2026-11-10	`3dc497a`	95
2026-11-08	`1e91f13`	95
2026-11-07	`c310c9d`	35