caveman is a skill and proxy for coding agents that shortens unnecessary explanatory prose so agents use fewer tokens while leaving code, commands, paths, and error messages unchanged. It is for people using coding agents who want terse responses and lower token use, including with Claude-based workflows. The catalogue entries contain its skills, commands, agents, instructions, and plugins.
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 JuliusBrussee/caveman --skill caveman-evidence-reviewgit clone --depth 1 https://github.com/JuliusBrussee/cavemanWrote 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/caveman-evidence-review)<a href="https://agentmods.dev/skills/juliusbrussee/caveman/caveman-evidence-review"><img src="https://agentmods.dev/badge/skills/juliusbrussee/caveman/caveman-evidence-review/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/juliusbrussee/caveman/caveman-evidence-review"><img src="https://agentmods.dev/badge/skills/juliusbrussee/caveman/caveman-evidence-review.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
- NVIDIA SkillSpector pass
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 | $0.00047 | $0.00908 |
| Opus 5.5 | $0.00019 | $0.00363 |
| Sonnet 5.5 | $0.00009 | $0.00182 |
| Haiku 4.5 | $0.00005 | $0.00091 |
Grade A, and why
caveman-evidence-review 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.
Copies of this mod
3 near-identical copies found in the catalogue:
- caveman-evidence-review — 100% identical, 0 lines differ
- caveman-evidence-review — 88% identical, 8 lines differ
- caveman-evidence-review — 88% identical, 8 lines differ
How it starts
The opening of the file, as written. The whole thing — 143 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Review Caveman evidence
Act as a read-only operator. Build conclusions from current Caveman data, not from repository guesses. Never start, approve, cancel, or roll back an experiment from this skill.
Hard rules
- Keep these buckets separate:
- measured provider-complete list-price cost;
inferreddaily headroom;verifiedledger savings;- evidence cost. Never add or relabel them.
- Do not fetch prompt, completion, tool, or artifact payloads unless the user explicitly asks for payload review. Metadata, spans, timing, models, token counts, status, and optimizer attribution are enough for the default review.
- Scope every read to the project selected by Caveman context. Never supply an organization id.
- Empty results are evidence of no current signal, not zero cost or zero risk.
- Cite trace ids and exact time windows used. Do not claim a cause from an aggregate alone.
Step 1 — Load context
Prefer MCP:
caveman_context {}
CLI fallback:
caveman cloud whoami
caveman cloud projects list
Stop if login or project selection is missing. Ask the user to run
caveman login or select a project; never guess.
Step 2 — Establish baseline
Use caveman_report for:
overviewcostsscoreworkflowsverified_savings
Then use caveman_plan for ranked daily headroom. If question is narrow, skip
unrelated reports. Read shortest set that can answer it.
CLI fallback:
caveman cloud costs
caveman cloud score
caveman cloud plan --json
State report window and basis before interpreting direction.
Step 3 — Test the leading explanation with traces
Use caveman_trace_search. Choose a bounded window and closed filters:
workflow, agent, model, provider, error code, runtime mode, cache status,
optimization id, status class, token/cost/latency bounds, compression, or
monitor verdict.
Useful groupings:
workflow— find jobs driving cost or failures;model— compare model mix;session— isolate retry or loop behavior;- ungrouped — identify exact traces.
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 · 143 lines · 47 tokens per session scan A 05bd896c76a4
caveman-evidence-review is a skill published in the GitHub repository JuliusBrussee/caveman (115,313 stars, last pushed yesterday), licensed Apache-2.0. It adds 47 tokens to every session and 908 once invoked, about $0.0002 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 2026-08-30.
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