Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add f-labs-io/agent-html-skills/plugin install html-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/f-labs-io/agent-html-skills/html-design-tokens)<a href="https://agentmods.dev/skills/f-labs-io/agent-html-skills/html-design-tokens"><img src="https://agentmods.dev/badge/skills/f-labs-io/agent-html-skills/html-design-tokens/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/f-labs-io/agent-html-skills/html-design-tokens"><img src="https://agentmods.dev/badge/skills/f-labs-io/agent-html-skills/html-design-tokens.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 | $0.00102 | $0.02048 |
| Opus 5 | $0.00051 | $0.01024 |
| Sonnet 5 | $0.00020 | $0.00410 |
| Haiku 4.5 | $0.00010 | $0.00205 |
Grade A, and why
html-design-tokens 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 7d 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 — 133 lines — stays where its author put it; the contents beside it link to each section on GitHub.
HTML Design Token Showcases
Markdown can't show colors. Unicode block characters are a hack and a tell that the writer wished they had a different format. For palettes, type scales, spacing systems, and any other design tokens, use HTML — the values can be displayed for what they actually are.
Pre-flight — run BEFORE writing the artifact
Invoke html-skills:html-skills-listen (Skill tool) first; it is idempotent. If it returns a URL, inject it verbatim as window.__CLAUDE_SUBMIT_URL__ in the HTML you are about to write, ?t= query string included (a local, single-session loopback handshake — not a credential). If it reported web/sandbox mode, leave that line out; submitToClaude then falls back to clipboard mode.
When to use this skill
- "Show me / document our [palette, colors, theme, tokens, design system]"
- "Build a token reference for X"
- "Document the spacing / type / color scale"
- Whenever a markdown file would have to fake a color with
█████blocks - Whenever a developer needs to copy CSS variables out of a doc
Output requirements
Each token is shown:
- Visually rendered (the actual color, the actual spacing, the actual shadow)
- With its identifier (
--color-accent-500,space-md) - With its value (
#B8602A,12px) - With a copy button that puts the value or the CSS variable on the clipboard
Token grids reflow at narrow widths so the doc stays readable on a phone — designers and developers actually read these on the move.
Sections to include
A complete token doc usually covers:
Color
A grid of swatches. Each swatch shows: hex, the token name, contrast ratio against black and white (e.g., "AAA 7.2:1"). Group by hue family or by semantic role (primary/secondary/error/success).
Type
Sample text rendered at every size in the scale. Show the font family, weight, size, line-height, and letter-spacing for each. Include a real sentence ("The quick brown fox…"), not lorem ipsum, so the reader can judge the type in context.
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.
- 7d ago Changed · +13 lines 2231da63ed47
- 11d ago First seen · 120 lines · 102 tokens per session scan A 4887ed8c5883
html-design-tokens is a skill published in the GitHub repository f-labs-io/agent-html-skills (55 stars, last pushed 8d ago), licensed MIT. It adds 102 tokens to every session and 2,048 once invoked, about $0.0005 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 2026-08-30.
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