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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 ultracave

Installs into whichever agent you are using.

About this skill
📄

SKILL.md

Installable skill definition

Quality Score

89/100

Supported Platforms

Universal

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.

Substance
26/30
Structure
13/20
Description
15/15
Adoption
20/20
Freshness
15/15

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.

SkillScoreStarsUpdatedFormat
ultracave (this skill)by JuliusBrussee89116.5ktodaySKILL.md
taste-skillby Leonxlnx100106.9ktodayCLAUDE.md
ai-job-searchby ai-job-search-dev10068.4ktodayCLAUDE.md
claude-howtoby luongnv8910046.3k3d agoCLAUDE.md
algorithmic-artby anthropics100177.9k39d agoSKILL.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.

name: 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

View on GitHub
GitHub Stars116.5k
CategoryDevelopment
Updated20h ago
Forks6.8k

Languages

Go

Trust signals

100/100

From repository metadata: license, adoption, age and documentation. Not a code audit — see the Safety scan above for what the skill file itself contains.

No cautions