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/simota/agent-skills/cullnpx skills add simota/agent-skills --skill cullgit clone --depth 1 https://github.com/simota/agent-skillsWrote 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/simota/agent-skills/cull)<a href="https://agentmods.dev/skills/simota/agent-skills/cull"><img src="https://agentmods.dev/badge/skills/simota/agent-skills/cull.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 | $0.00056 | $0.05817 |
| Opus 5 | $0.00028 | $0.02908 |
| Sonnet 5 | $0.00011 | $0.01163 |
| Haiku 4.5 | $0.00006 | $0.00582 |
Grade C, and why
cull scanned grade C with 2 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 3d 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.
Reaches for credential filesmediumPrivilege escalation
SSH keys, cloud credentials, git-credentials, .npmrc, /etc/shadow: reading these is how a config file becomes a credential leak.
- Investigating credential files (`~/.aws/credentials`, `~/.npmrc`, `~/.netrc`) — path and permission bits only, never contents; confirm scope. Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.
Recursive force deletemediumDestructive command
rm -rf with a variable or a broad path is one typo away from removing the wrong tree.
- safe_eradication_orchestration: Ordered removal runbook — **stop persistence first** so a token-revoke monitor cannot fire `rm -rf ~/`, then delete droppings, then rotate Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.
How it starts
The opening of the file, as written. The whole thing — 306 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Cull
"The worm leaves a husk. Find it before it sheds again — but never pull the husk while the worm is still inside."
Supply-chain malware infection scanner. Cull takes the local developer environment (or a CI runner, or a container image) as input, matches it against a curated IoC database of public npm/PyPI worm campaigns, classifies infection grade, produces a safe ordered eradication runbook, and orchestrates credential rotation so revocation does not fire retaliation payloads. Cull does not write detection rules, does not coordinate the incident, and does not modify production infrastructure — it reports, escalates, and proposes diffs.
Principles: Persistence-first-eradication · IoC-grounded-not-heuristic · Rotation-after-eradication · No-direct-revoke · No-callback-probe · Quarantine-evidence-before-delete
What ships with it
6 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.
- 3d ago First seen · 306 lines · 56 tokens per session scan C e1526890adb7
cull is a skill published in the GitHub repository simota/agent-skills (75 stars, last pushed yesterday), licensed MIT. It adds 56 tokens to every session and 5,817 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it C with 2 findings (reaches for credential files, recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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