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 skills add hamzaPixl/pixl-ai --skill caveman-compressgit clone --depth 1 https://github.com/hamzaPixl/pixl-aiWrote 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/hamzapixl/pixl-ai/caveman-compress)<a href="https://agentmods.dev/skills/hamzapixl/pixl-ai/caveman-compress"><img src="https://agentmods.dev/badge/skills/hamzapixl/pixl-ai/caveman-compress/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/hamzapixl/pixl-ai/caveman-compress"><img src="https://agentmods.dev/badge/skills/hamzapixl/pixl-ai/caveman-compress.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00118 | $0.00993 |
| Opus 5.5 | $0.00047 | $0.00397 |
| Sonnet 5.5 | $0.00024 | $0.00199 |
| Haiku 4.5 | $0.00012 | $0.00099 |
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 1mo 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 — 91 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Caveman Compress
Purpose
Compress natural-language files into caveman-speak to reduce input tokens. Compressed version overwrites original. Human-readable backup saved as <filename>.original.md.
Trigger
/caveman-compress <filepath> or when user asks to compress a memory file.
Safety
- Skips non-natural-language files (code, JSON, YAML) automatically via
detect.py - Aborts if
<filename>.original.mdbackup already exists (prevents overwrite) - 500KB file-size cap
- Validates headings, code blocks, URLs, file paths preserved exactly — retries up to 2 times with targeted fixes, restores original on final failure
Process
-
Scripts live in
skills/caveman-compress/scripts/(adjacent to this SKILL.md). -
Run:
cd path/to/pixl-crew/skills/caveman-compress && python3 -m scripts <absolute_filepath>Or from the project root, pointing at the vendored copy under
packages/crew/skills/caveman-compress/. -
The CLI will:
- detect file type (no tokens)
- call Claude via
ANTHROPIC_API_KEYenv var OR theclaude --printCLI (falls back) - validate output (no tokens) — headings, code blocks, URLs, paths must match
- if errors: cherry-pick fix with Claude (targeted fixes only, no recompression)
- retry up to 2 times
- if still failing after 2 retries: restore original file, delete backup, report error
-
Return result to user.
Environment
ANTHROPIC_API_KEY(optional): direct API call — requirespip install anthropic- Fallback:
claude --printCLI (uses Claude Code desktop auth) CAVEMAN_MODEL(optional): override model, defaultclaude-sonnet-4-5
Compression Rules
Remove
- Articles: a, an, the (except in lite mode)
- Filler: just, really, basically, actually, simply, essentially, generally
- Pleasantries: "sure", "certainly", "of course", "happy to", "I'd recommend"
- Hedging: "it might be worth", "you could consider", "it would be good to"
- Redundant phrasing: "in order to" → "to", "make sure to" → "ensure"
- Connective fluff: "however", "furthermore", "additionally"
What ships with it
7 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 1mo ago First seen · 91 lines · 118 tokens per session scan A 7c037584d154
caveman-compress is a skill published in the GitHub repository hamzaPixl/pixl-ai (2 stars, last pushed 6mo ago), licensed MIT. It adds 118 tokens to every session and 993 once invoked, about $0.0005 per session on Opus 5.5. 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 2026-08-31.
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