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 coroboros/agent-skills --skill ultrapexgit clone --depth 1 https://github.com/coroboros/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/coroboros/agent-skills/ultrapex)<a href="https://agentmods.dev/skills/coroboros/agent-skills/ultrapex"><img src="https://agentmods.dev/badge/skills/coroboros/agent-skills/ultrapex/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/coroboros/agent-skills/ultrapex"><img src="https://agentmods.dev/badge/skills/coroboros/agent-skills/ultrapex.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 | $0.00057 | $0.01869 |
| Opus 5 | $0.00028 | $0.00934 |
| Sonnet 5 | $0.00011 | $0.00374 |
| Haiku 4.5 | $0.00006 | $0.00187 |
Grade A, and why
ultrapex 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 today.
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 — 117 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Ultrapex
Critical — Adversarial verification
Verify consequential findings and decisions before acting on them.
- Seek counterexamples and independent evidence for load-bearing or contested claims. Use fresh reviewers when available and useful; label sequential self-review as less independent.
- Resolve material findings by correction, evidence-backed refutation, or an explicit remaining risk. Never silently drop them.
- Evidence decides, not reviewer counts or confidence alone. One reproducible defect can invalidate a conclusion.
- Scale verification to the stakes. Keep settled facts settled and reversible, low-impact checks light.
Important — Engineering discipline
Apply these rules when writing, editing, or proposing code.
- Solve the accepted problem with the smallest complete change. Reuse existing mechanisms; preserve unrelated work. Validate external inputs and real failure states.
- Read the affected implementation, callers, and shared utilities before editing. Ground code claims in inspected evidence.
- Implement the general behavior. Tests must distinguish correct behavior from the defect; never hard-code to fixtures or preserve a demonstrably wrong test.
- Carry scope, corrections, and existing authorization through handoffs. Run applicable required checks; repeat them only for changed behavior or unresolved failures.
Critical — Label hygiene
Remove private planning labels and process narration from shipped code and prose. State the domain behavior directly.
- Planning labels — replace
WS-N,Phase-A,Step-3, and private plan names with domain terms. - Process narration — remove authoring history and references that require private planning context. Explain the resulting behavior or constraint.
What ships with it
1 file 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.
- today Changed · -55 tokens per session 4bc3d1a39cc1
- 8d ago First seen · 117 lines · 112 tokens per session scan A 74c330606bbf
ultrapex is a skill published in the GitHub repository coroboros/agent-skills (4 stars, last pushed 2d ago), licensed MIT. It adds 57 tokens to every session and 1,869 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 2026-08-31.
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