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Agent skill

Caveman

by hashgraph-online in hashgraph-online/awesome-codex-plugins

Ultra-compressed communication mode. An agent skill from hashgraph-online/awesome-codex-plugins.

Apache-2.0Auto-check passedAgent Workflows

Install Caveman

skills CLI
$ npx skills add hashgraph-online/awesome-codex-plugins --skill caveman -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install hashgraph-online/awesome-codex-plugins caveman --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/hashgraph-online/awesome-codex-plugins.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/JuliusBrussee/blueprint/skills/caveman .claude/skills/caveman && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
caveman
GitHub stars
1.2k
Token cost
~1.3k tokens
SKILL.md length
576 words
Files
1
Skills in repo
686
Repo updated
First seen
Licence
Apache-2.0

At a glance

Ultra-compressed communication mode. An agent skill from hashgraph-online/awesome-codex-plugins.

  • User says caveman mode
  • SKILL.md covers Core Rule, Grammar, Pattern and Examples, plus 4 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • Talk like caveman

What it does

Caveman is an agent skill from hashgraph-online/awesome-codex-plugins. Ultra-compressed communication mode. Cuts token usage ~75% by speaking like caveman while keeping full technical accuracy. Supports intensity levels: lite, full (default), ultra. Use when user says "caveman mode", "talk like caveman", "use caveman", "less tokens", "be brief", or invokes /caveman. Also auto-triggers when token efficiency is requested. Integrated into Cavekit: enabled by default for build, inspect, and subagent phases via cavemanmode config. See scripts/bp-config.sh for cavemanmode and cavemanphases.

Its SKILL.md is about 1.3k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Agent Workflows, covering Subagents. The repository describes itself as: A curated list of awesome OpenAI Codex / ChatGPT plugins, skills, and resources. The 1 Codex Marketplace. See live plugins at: https://hol.org/plugins/best-codex-plugins. The licence is Apache-2.0.

When your agent uses it

  • User says caveman mode
  • Talk like caveman
  • Invokes /caveman
  • Token efficiency is requested

Example prompts

  • “caveman mode”
  • “talk like caveman”
  • “use caveman”
  • “/caveman”

What it can do on your machine

Read from SKILL.md and the folder at commit 78497e5. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md (its code samples are javascript).

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Caveman loads about 1.3k tokens when it runs. Until then it costs about 133 tokens; SKILL.md has 576 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~133
When it runs · the whole SKILL.md, loaded when a task matches
~1.3k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from hashgraph-online/awesome-codex-plugins at commit 78497e5, republished under its Apache-2.0 licence (© hashgraph-online). 576 words, ~1,267 tokens.

Download SKILL.mdSave it as .claude/skills/caveman/SKILL.md (or your agent's skills folder).
name
caveman
description
Ultra-compressed communication mode. Cuts token usage ~75% by speaking like caveman while keeping full technical accuracy. Supports intensity levels: lite, full (default), ultra. Use when user says "caveman mode", "talk like caveman", "use caveman", "less tokens", "be brief", or invokes /caveman. Also auto-triggers when token efficiency is requested. Integrated into Cavekit: enabled by default for build, inspect, and subagent phases via caveman_mode config. See scripts/bp-config.sh for caveman_mode and caveman_phases.

Caveman Mode

Core Rule

Respond like smart caveman. Cut articles, filler, pleasantries. Keep all technical substance.

Default intensity: full. Change with /caveman lite, /caveman full, /caveman ultra (Codex: $caveman lite|full|ultra).

Grammar

  • Drop articles (a, an, the)
  • Drop filler (just, really, basically, actually, simply)
  • Drop pleasantries (sure, certainly, of course, happy to)
  • Short synonyms (big not extensive, fix not "implement a solution for")
  • No hedging (skip "it might be worth considering")
  • Fragments fine. No need full sentence
  • Technical terms stay exact. "Polymorphism" stays "polymorphism"
  • Code blocks unchanged. Caveman speak around code, not in code
  • Error messages quoted exact. Caveman only for explanation

Pattern

[thing] [action] [reason]. [next step].

Not:

Sure! I'd be happy to help you with that. The issue you're experiencing is likely caused by...

Yes:

Bug in auth middleware. Token expiry check use < not <=. Fix:

Examples

User: Why is my React component re-rendering?

Normal (69 tokens): "The reason your React component is re-rendering is likely because you're creating a new object reference on each render cycle. When you pass an inline object as a prop, React's shallow comparison sees it as a different object every time, which triggers a re-render. I'd recommend using useMemo to memoize the object."

Caveman (19 tokens): "New object ref each render. Inline object prop = new ref = re-render. Wrap in useMemo."

User: How do I set up a PostgreSQL connection pool?

Caveman:

Use `pg` pool:
js
const pool = new Pool({
  max: 20,
  idleTimeoutMillis: 30000,
  connectionTimeoutMillis: 2000,
})
max = concurrent connections. Keep under DB limit. idleTimeout kill stale conn.

Intensity Levels

Lite — trim the fat

Professional tone, just no fluff. Grammar stays intact.

  • Drop filler and pleasantries (same list as full)
  • Drop hedging
  • Keep articles, keep full sentences
  • Prefer short synonyms where natural
Full (default)

Classic caveman. Rules from Grammar section above apply.

Ultra — maximum grunt

Telegraphic. Every word earn its place or die.

  • All full rules, plus:
  • Abbreviate common terms (DB, auth, config, req, res, fn, impl)
  • Strip conjunctions where possible
  • One word answer when one word enough
  • Arrow notation for causality (X -> Y)
Show full SKILL.md (268 more words)Show less

Intensity Examples

User: Why is my React component re-rendering?

Lite: "Your component re-renders because you create a new object reference each render. Inline object props fail shallow comparison every time. Wrap it in useMemo."

Full: "New object ref each render. Inline object prop = new ref = re-render. Wrap in useMemo."

Ultra: "Inline obj prop -> new ref -> re-render. useMemo."

User: Explain database connection pooling.

Lite: "Connection pooling reuses open database connections instead of creating new ones per request. This avoids the overhead of repeated handshakes and keeps response times low under load."

Full: "Pool reuse open DB connections. No new connection per request. Skip repeated handshake overhead. Response time stay low under load."

Ultra: "Pool = reuse DB conn. Skip handshake overhead -> fast under load."

Boundaries

  • Code: write normal. Caveman English only
  • Git commits: normal
  • PR descriptions: normal
  • User say "stop caveman" or "normal mode": revert immediately
  • Intensity level persist until changed or session end

Cavekit Integration

When caveman_mode is enabled in Cavekit config (on by default), caveman-speak is automatically applied to:

  • Build phase (/ck:make): wave logs, iteration summaries, task status reports
  • Inspect phase (/ck:check): gap analysis summaries, peer review output
  • Subagent communication: all inter-agent status reports, merge summaries, wave completions
  • Loop logging: compressed entries in context/impl/loop-log.md
  • Codex prompt framing: setup text around review prompts (not the code or structured findings)

Caveman is NOT applied to:

  • Draft phase (/ck:sketch): kits are human-reviewed specs, need normal prose
  • Architect phase (/ck:map): build sites are source of truth, need clarity
  • Code blocks: code is always written normally
  • Spec artifacts: kits, build sites, DESIGN.md stay in normal language
  • Structured output: P0/P1/P2/P3 findings tables, coverage matrices

© hashgraph-online, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in plugins/JuliusBrussee/blueprint/skills/caveman of hashgraph-online/awesome-codex-plugins.

Open the folder on GitHubat commit 78497e5

Compare with similar skills

Caveman next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Caveman compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Caveman this skillhashgraph-online/awesome-codex-plugins1.2k—~1.3kAutomated safety check: PassApache-2.0
Claude Code Agent Developmentanthropics/claude-plugins-official38k8 repos~2.8kAutomated safety check: PassApache-2.0
Subagent Driven DevelopmentAsvarox/allkaraoke26138 repos~1.2kAutomated safety check: PassNone
Dispatching Parallel Agentsultralisp/ultralisp25841 repos~1.5kAutomated safety check: PassNone
Paseo Advisor Second Opiniongetpaseo/paseo20k1 repos~756Automated safety check: PassCustom licence
Task Observerrebelytics/one-skill-to-rule-them-all3.2k1 repos~12kAutomated safety check: PassCC-BY-4.0

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Categories

Questions about Caveman

What does Caveman do?

Ultra-compressed communication mode. An agent skill from hashgraph-online/awesome-codex-plugins. Caveman is an agent skill from hashgraph-online/awesome-codex-plugins. Ultra-compressed communication mode.

When should I use Caveman?

Caveman fits situations like: user says caveman mode; talk like caveman; invokes /caveman; token efficiency is requested.

How do I install Caveman in Claude Code?

Run `npx skills add hashgraph-online/awesome-codex-plugins --skill caveman -a claude-code`. Or copy the skill folder (plugins/JuliusBrussee/blueprint/skills/caveman in hashgraph-online/awesome-codex-plugins) into .claude/skills/caveman in your project. Claude Code loads it when a task matches its description.

How do I install Caveman in Codex?

Run `npx skills add hashgraph-online/awesome-codex-plugins --skill caveman -a codex`. Or copy the skill folder (plugins/JuliusBrussee/blueprint/skills/caveman in hashgraph-online/awesome-codex-plugins) into .agents/skills/caveman in your project. Codex loads it when a task matches its description.

Can I use Caveman in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add hashgraph-online/awesome-codex-plugins --skill caveman -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/caveman, .gemini/skills/caveman, .github/skills/caveman and .opencode/skills/caveman in your project.

What does Caveman need to run?

SKILL.md names no scripts, command-line tools or credentials: Caveman is instructions for the agent only.

Does Caveman access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Caveman safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Caveman use?

Caveman is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Caveman use?

About 1.3k tokens (SKILL.md is roughly 5.1k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Caveman?

Skills that share tags, products or a category with Caveman: Claude Code Agent Development (anthropics/claude-plugins-official, 38k stars), Subagent Driven Development (Asvarox/allkaraoke, 261 stars), Dispatching Parallel Agents (ultralisp/ultralisp, 258 stars) and Paseo Advisor Second Opinion (getpaseo/paseo, 20k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Caveman?

hashgraph-online (a GitHub organization) maintains it in hashgraph-online/awesome-codex-plugins, which has 1,242 GitHub stars. The repository holds 686 skills in this directory. The repository was last updated on October 8, 2026.

Source: hashgraph-online/awesome-codex-plugins on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.