Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/juliusbrussee/caveman-code/caveman-compressnpx skills add JuliusBrussee/caveman-code --skill caveman-compressgit clone --depth 1 https://github.com/JuliusBrussee/caveman-codeWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/juliusbrussee/caveman-code/caveman-compress)<a href="https://agentmods.dev/skills/juliusbrussee/caveman-code/caveman-compress"><img src="https://agentmods.dev/badge/skills/juliusbrussee/caveman-code/caveman-compress.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00062 | $0.01165 |
| Opus 5 | $0.00031 | $0.00583 |
| Sonnet 5 | $0.00012 | $0.00233 |
| Haiku 4.5 | $0.00006 | $0.00117 |
Grade A, and why
caveman-compress scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 6d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 137 lines — stays where its author put it; the contents beside it link to each section on GitHub.
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:
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
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 6d ago First seen · 137 lines · 62 tokens per session scan A fc8a29eb2d7f
caveman-compress is a skill published in the GitHub repository JuliusBrussee/caveman-code (932 stars, last pushed 22d ago), licensed MIT. It adds 62 tokens to every session and 1,165 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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