PenguinHarness is a local-first platform in which multiple AI agents create, evaluate, optimize, and deploy agent applications. It is for people building AI software who want agents to generate applications and improve their own behavior through skills.
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 Prism-Shadow/penguin-harness --skill bento-slidesgit clone --depth 1 https://github.com/Prism-Shadow/penguin-harnessWrote 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/prism-shadow/penguin-harness/bento-slides)<a href="https://agentmods.dev/skills/prism-shadow/penguin-harness/bento-slides"><img src="https://agentmods.dev/badge/skills/prism-shadow/penguin-harness/bento-slides/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/prism-shadow/penguin-harness/bento-slides"><img src="https://agentmods.dev/badge/skills/prism-shadow/penguin-harness/bento-slides.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Agent Snooping · line 16 Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
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 | $0.00000 | $0.01661 |
| Opus 5 | $0.00000 | $0.00830 |
| Sonnet 5 | $0.00000 | $0.00332 |
| Haiku 4.5 | $0.00000 | $0.00166 |
Grade A, and why
bento-slides scanned grade A with 1 finding 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 5d 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -fsSL https://bento.page/releases/slides/Bento_Slides.bento.html -o "<Topic>.bento.html" How it starts
The opening of the file, as written. The whole thing — 76 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Authoring Bento decks
A Bento deck is one self-contained .bento.html file. The document is plain JSON in a single block:
<script type="application/bento+json" id="bento-doc"> { "format":"bento/slides", ... } </script>
Edit that block only, in place. Escape every < in the JSON as \u003c so it can never contain a literal </script>. Leave the rest of the file — the compressed runtime — untouched. In a chat context the user copies the JSON out instead (Save ▾ → Copy document JSON) and pastes the replacement back (Save ▾ → Replace from JSON…); window.bento.loadDoc(json) does the same from the console.
Adapted from the Bento project's own skill, https://bento.page/skills/bento-slides/SKILL.md (MIT, © 2026 The Bento/Suite authors). The authoritative schema and recipe reference is https://bento.page/agents.md.
Before you start
If the user's message only invokes this skill (e.g. "use bento-slides skill") without a concrete request, ask what deck they want before doing anything: the topic, the source material to build it from, and whether to start from scratch or edit an existing .bento.html. Do not download anything or write a document until the goal is clear.
Starting from nothing
The user does not need Bento installed — the app ships inside every deck. When there is no .bento.html to edit, fetch the latest signed release and author into it:
# name the file after the deck's topic, e.g. Q4_Review.bento.html
curl -fsSL https://bento.page/releases/slides/Bento_Slides.bento.html -o "<Topic>.bento.html"
On Windows without curl: iwr https://bento.page/releases/slides/Bento_Slides.bento.html -OutFile <Topic>.bento.html.
Verify the download contains id="bento-doc", then replace that block's JSON — it ships with a showcase deck, which is discarded. For a fresh document:
- Fetch https://bento.page/agents.md before authoring and start from its "Minimal valid document" skeleton.
sizeandtheme(includingtheme.fontFamily) are required; the app will not boot without them. - Fully specify element fields as the skeleton shows — shapes need
stroke/strokeWidth, text needsfontFamily/align/valign. Missing fields render wrong or not at all. - Omit
docIdandcollabentirely. The app mints a fresh identity and dormant collaboration credentials on first open.
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.
- 5d ago Changed · -4 lines c4a7cf4005f0
- 10d ago First seen · 80 lines · 0 tokens per session scan A 93ffa2356a4e
bento-slides is a skill published in the GitHub repository Prism-Shadow/penguin-harness (2,048 stars, last pushed today), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 1,661 tokens. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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