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 oborchers/fractional-cto --skill design-tokensgit clone --depth 1 https://github.com/oborchers/fractional-ctoWrote 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/oborchers/fractional-cto/design-tokens)<a href="https://agentmods.dev/skills/oborchers/fractional-cto/design-tokens"><img src="https://agentmods.dev/badge/skills/oborchers/fractional-cto/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/oborchers/fractional-cto/design-tokens"><img src="https://agentmods.dev/badge/skills/oborchers/fractional-cto/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 | $0.00063 | $0.00858 |
| Opus 5.5 | $0.00025 | $0.00343 |
| Sonnet 5.5 | $0.00013 | $0.00172 |
| Haiku 4.5 | $0.00006 | $0.00086 |
Grade A, and why
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 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 — 89 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Design Tokens Make Theming a Non-Event
The industry has converged on a three-tier token architecture. Adopting it correctly means theme switching requires only toggling a class — no component re-renders, no complex logic.
Three-Tier Token Architecture
Tier 1: Primitive Tokens
Raw values. The palette.
Examples: #3B82F6, 16px, 600
Tier 2: Semantic Tokens
Purpose-driven aliases. The meaning layer.
Examples: --color-text-primary, --color-bg-surface, --spacing-md
Tier 3: Component Tokens
Scoped references. The component layer.
Examples: --button-bg, --card-border-radius, --input-border-color
The Critical Naming Rule
Name tokens by purpose, not appearance.
| Bad (appearance) | Good (purpose) |
|---|---|
--color-white |
--color-bg-surface |
--color-blue-500 |
--color-action-primary |
--font-large |
--font-heading |
--color-gray-200 |
--color-border-default |
--color-bg-surface works in both light and dark mode. --color-white becomes meaningless the moment themes change.
Theme Switching Architecture
Use CSS custom properties with a class toggle on the root element. CSS variables cascade down, automatically updating every component without re-rendering the component tree.
Implementation pattern:
- Define semantic tokens as CSS custom properties
- Override values in a
.dark(or[data-theme="dark"]) selector - Toggle the class/attribute on
<html>to switch themes - No JavaScript re-renders needed
Dark Mode Implementation
Use the hybrid approach:
- Detect system preference with
prefers-color-scheme - Allow manual override via a toggle
- Store the preference in
localStorage - Apply via a
data-themeattribute on<html>
Consider Twitter's three-option model for apps where users spend long sessions:
- Default (light)
- Dim (reduced contrast dark)
- Lights Out (true black)
W3C Design Tokens Community Group
What ships with it
2 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 · 89 lines · 63 tokens per session scan A c48216d96505
design-tokens is a skill published in the GitHub repository oborchers/fractional-cto (32 stars, last pushed 5d ago), licensed MIT. It adds 63 tokens to every session and 858 once invoked, about $0.0003 per session on Opus 5.5. 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 2026-10-13.
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