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/bks-lab/open-bridge/html-canvasnpx skills add bks-lab/open-bridge --skill html-canvasgit clone --depth 1 https://github.com/bks-lab/open-bridgeWrote 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/bks-lab/open-bridge/html-canvas)<a href="https://agentmods.dev/skills/bks-lab/open-bridge/html-canvas"><img src="https://agentmods.dev/badge/skills/bks-lab/open-bridge/html-canvas.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 5.1 | $0.00216 | $0.01645 |
| Opus 5 | $0.00108 | $0.00822 |
| Sonnet 5 | $0.00043 | $0.00329 |
| Haiku 4.5 | $0.00022 | $0.00164 |
Grade A, and why
html-canvas 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 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.
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 — 116 lines — stays where its author put it; the contents beside it link to each section on GitHub.
html-canvas
Generate rich single-file HTML that reads well, themes light/dark, switches DE/EN, and pulls every colour from DESIGN.md — the genre we keep hand-building (explainers, reference kits, concept/architecture pages, use-case boards, multi-section docs). One file, offline, no external dependencies, native UTF-8.
Scope:
html-canvasowns content-as-document — bilingual explainers, reference/concept/architecture pages, multi-section docs — with first-class light/dark + DE/EN toggles and a DESIGN.md-token section catalog. Marketing / landing / pitch pages belong to a style-picker design skill, if your Bridge ships one.
The three controls every deliverable ships
These are the point of the skill — they come baked into the shell, don't reinvent them:
- Light / Dark — button + key
T+localStorage, anti-FOUC pre-paint in<head>, OS preference when unset. Applied via the.darkclass on<html>(DESIGN.md convention). - DE / EN — button + key
L+localStorage. Every translatable run ships asdata-de/data-ensiblings; the swap is pure CSS. Default = the conversation language. (Repo/OSS-shipped artifacts stay English regardless.) - Print / PDF — first-class: chrome hidden, reveals forced visible, dark pages forced to a light palette for clean paper.
How to build
One page: copy assets/shell.html → fill the {{placeholders}} → compose
<main> from the blocks in references/sections.md → add behaviours from
references/interactivity.md and motion from assets/animations.css if wanted.
Render light and dark, DE and EN, then file under
work/tasks/<slug>/deliverables/.
A kit (many pages/boards): use the parallel-builder workflow in
references/build-workflow.md — one convention audit emits a shared shell, N
builders run concurrently on it, one adversarial reviewer checks every page, then
integrate + write an index launcher. This is how the 12-board sets get built
consistently.
What ships with it
8 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.
- 5d ago First seen · 116 lines · 216 tokens per session scan A 933f5c06569b
html-canvas is a skill published in the GitHub repository bks-lab/open-bridge (8 stars, last pushed yesterday), licensed MIT. It adds 216 tokens to every session and 1,645 once invoked, about $0.0011 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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