Bento is a presentation editor and viewer contained entirely in a single HTML file. People use it to create, edit, present and share slide decks in a browser without requiring recipients to install an application.
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 nyblnet/bento --skill bento-slidesgit clone --depth 1 https://github.com/nyblnet/bentoWrote 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/nyblnet/bento/bento-slides)<a href="https://agentmods.dev/skills/nyblnet/bento/bento-slides"><img src="https://agentmods.dev/badge/skills/nyblnet/bento/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/nyblnet/bento/bento-slides"><img src="https://agentmods.dev/badge/skills/nyblnet/bento/bento-slides.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- 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 | $0.00125 | $0.01953 |
| Opus 5.5 | $0.00050 | $0.00781 |
| Sonnet 5.5 | $0.00025 | $0.00391 |
| Haiku 4.5 | $0.00013 | $0.00195 |
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 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.
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" Copies of this mod
1 near-identical copy found in the catalogue:
- bento-slides — 100% identical, 0 lines differ
How it starts
The opening of the file, as written. The whole thing — 137 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>
You 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 instead, the user
copies the JSON out (Save ▾ → Copy document JSON) and pastes your
replacement back (Save ▾ → Replace from JSON…); window.bento.loadDoc(json)
does it from the console.
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
yourself 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"
(Windows without curl: iwr https://bento.page/releases/slides/Bento_Slides.bento.html -OutFile <Topic>.bento.html.)
Then verify the download contains id="bento-doc", and write your document
into that block. The block is empty in the downloaded file — a browser
mints a showcase deck on first open, but on disk there is nothing to discard
and nothing to copy from, so do not go looking for it.
Rules 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.
When done, open it (open / xdg-open / start) — the file boots straight
into the editor with the finished deck — and look at every slide before you
report done. Text overflow, elements crowding each other, a heading that
wrapped to three lines and a chart key the renderer dropped are all invisible
in the JSON and obvious on screen. Author, render, check, fix; a deck nobody
looked at is not finished.
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 · 137 lines · 125 tokens per session scan A 02396087b64a
bento-slides is a skill published in the GitHub repository nyblnet/bento (5,563 stars, last pushed 2d ago), licensed MIT. It adds 125 tokens to every session and 1,953 once invoked, about $0.0005 per session on Opus 5.5. 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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