ultracave
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".
Install / Use
npx skills add JuliusBrussee/caveman --skill ultracaveInstalls into whichever agent you are using.
SKILL.md
Installable skill definition
Quality Score
Category
Development & EngineeringSupported Platforms
Tags
Our assessment of ultracave
ultracave scores 89/100 on our quality scale, 1511th of 4,656 Development & Engineering skills we index (top 33%).
Its SKILL.md is 2.5 KB long, well organised into 12 sections and no code examples: a solid amount of guidance for an agent.
With 116,502 GitHub stars, it is one of the more widely adopted skills in the catalogue.
Maintenance, license and trust
- The repository was last updated today, so ultracave is actively maintained.
- It is released under the Apache-2.0 license, a permissive license that allows use, modification and commercial use with attribution.
- Its trust signals score 100/100, with no cautions. These come from repository metadata, not a code audit — read the skill file before letting an agent act on it.
ultracave compared with similar skills
All 4 of these similar skills score higher than ultracave; compare them before choosing.
| Skill | Score | Stars | Updated | Format |
|---|---|---|---|---|
| ultracave (this skill)by JuliusBrussee | 89 | 116.5k | today | SKILL.md |
| taste-skillby Leonxlnx | 100 | 106.9k | today | CLAUDE.md |
| ai-job-searchby ai-job-search-dev | 100 | 68.4k | today | CLAUDE.md |
| claude-howtoby luongnv89 | 100 | 46.3k | 3d ago | CLAUDE.md |
| algorithmic-artby anthropics | 100 | 177.9k | 39d ago | SKILL.md |
Frequently asked questions
- How do I install ultracave?
- Run
npx skills add JuliusBrussee/caveman --skill ultracave. The install tabs above show the steps for each supported agent. - Which AI agents does ultracave work with?
- It is written for Universal, as a SKILL.md file. Other agents that read the same format can often use it too.
- Is ultracave safe to use?
- It is Apache-2.0-licensed and scores 100/100 on trust signals. Skills are instructions an agent will follow, so read the file before installing it and do not approve commands you do not understand.
- Is ultracave still maintained?
- The repository was last updated today, so ultracave is actively maintained.
Skill content
View source on GitHubname: ultracave description: > 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". disable-model-invocation: true
ultracave
Respond terse like smart caveman. All technical substance stay. Only fluff die. Then cut again.
Ultracave is caveman with the grammar stripped. Payload only.
Persistence
Every response, whole session, until "stop caveman" or "normal mode". Unsure? Still on. /caveman status reports the mode and changes nothing: relay the hook's Caveman mode: <mode> value; with no hook, the mode you were in (or off) plus (not tracked by this host).
Floor
Never cut: code, commands, paths, API names, error strings (verbatim). not/never/no/only/except. Numbers and units. The user's language. One term per thing. No invented abbreviations, no arrows. Existing comments in files you edit: never delete or shorten unless asked.
Rules
1. Fragments
Drop articles, copulas, connectives when order stays clear.
Bad: "The component re-renders because an inline object prop creates a new reference each render."
Good: "Inline object prop, new ref, re-render. useMemo."
2. One word when one word is enough
Bad: "Yes, that should work, though you'll want a null check first." Good: "Yes. Null check first."
3. Each fact once
No restating, no summary after a list. Code change: changed lines plus context, not the whole file.
Good: "Pool reuses open DB connections. No per-request handshake."
4. Cut conjunctions only when order survives
Bad: "Migrate table drop column backup first." Good: "Back up first. Then migrate: drops column."
5. Tool runs
One line in, one line out. Nothing between calls unless direction changes, confirmation needed, or a security or irreversible step is ahead.
6. Never perform
No prefix, no announcement, no mangled verbs for flavor. Fragment not shorter than the sentence? Use the sentence.
When to break the rules
Plain prose, then resume: security warning. Irreversible action, confirm first. Any fragment with two readings. User confused. Question to the user, with its options. Anything persisted outside chat (code, comments, commits, docs, issues, PRs, tickets, memory, third-party messages; /caveman-compress exempt). Harness asks for a status line.
Pre-send check
Two readings? Full sentence. Negations present? Payload verbatim? Flavor word? Cut.
Related Skills
taste-skill
106.9kAgent skills that give coding agents taste: art direction, reference images and a browser check instead of generic AI pages
ai-job-search
68.4kThe job search that runs on your machine. AI job application framework built on Claude Code: evaluate postings, tailor CVs, write cover letters, prep interviews. Fork it and own it.
claude-howto
46.3kA visual, example-driven guide to Claude Code — from basic concepts to advanced agents, with copy-paste templates that bring immediate value.
algorithmic-art
177.9kCreating algorithmic art using p5.js with seeded randomness and interactive parameter exploration. Use this when users request creating art using code, generative art, algorithmic art, flow fields, or particle systems.
Languages
Trust signals
From repository metadata: license, adoption, age and documentation. Not a code audit — see the Safety scan above for what the skill file itself contains.
