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 Kevin-Liu-01/Sigil-UI --skill sigil-messaginggit clone --depth 1 https://github.com/Kevin-Liu-01/Sigil-UIWrote 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/kevin-liu-01/sigil-ui/sigil-messaging)<a href="https://agentmods.dev/skills/kevin-liu-01/sigil-ui/sigil-messaging"><img src="https://agentmods.dev/badge/skills/kevin-liu-01/sigil-ui/sigil-messaging/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/kevin-liu-01/sigil-ui/sigil-messaging"><img src="https://agentmods.dev/badge/skills/kevin-liu-01/sigil-ui/sigil-messaging.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 | $0.00097 | $0.02195 |
| Opus 5 | $0.00048 | $0.01097 |
| Sonnet 5 | $0.00019 | $0.00439 |
| Haiku 4.5 | $0.00010 | $0.00219 |
Grade A, and why
sigil-messaging 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 11d 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 — 211 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill — sigil-messaging
Canonical source of truth for all Sigil UI positioning, copy, stats, naming, and tone. Every README, docs page, marketing surface, and agent-generated copy MUST reference this file before writing or updating text.
When to Use
- Writing or updating README, docs, marketing pages, about pages
- Generating llms.txt or agent instructions
- Creating social posts or blog content about Sigil
- Reviewing copy for consistency
- Answering "what is Sigil" in any context
Canonical Product Stats
These are the ONLY numbers to use. Do not round differently or invent counts.
| Stat | Value | Note |
|---|---|---|
| Presets | 46 | 44 catalog + default + template |
| Components | 350+ | 545 exports across 258 files; "350+" is the marketing floor |
| Tokens | 519 | Type-level field count across all categories |
| Categories | 33 | Top-level keys on SigilTokens |
| Primitives | 40+ | 28 Radix + 13 Base UI families |
| CLI commands | 11 | init, convert, add, preset, inspire, design, docs, adapter, diff, doctor |
Product Identity
One-liner
One markdown file controls your entire design system.
Elevator pitch (2 sentences)
Sigil is a token-driven React design system where one DESIGN.md file defines every color, font, radius, shadow, and animation across 350+ components. Edit the markdown — CSS, Tailwind v4, and W3C JSON recompile automatically.
What Sigil IS
- A design system that compiles from markdown
- Token-first: 519 tokens across 33 categories flow into components via CSS custom properties
- Constraint-first: agents compose from pre-built token-driven parts, not blank canvas
- Agent-first: the DESIGN.md surface is readable and editable by both humans and AI agents
- Preset-based: 46 curated presets, each a complete 500+ token visual identity
- Audited: quality validated at every layer (doctor, diff, type guarantees, WCAG)
- Framework: React + Tailwind v4 + Radix + OKLCH
What Sigil is NOT
- Not a reference library (agents don't just read context — they operate within constraints)
- Not a component library you style manually
- Not a theme switcher (presets change structure, not just colors)
- Not a Figma plugin or design tool
- Not locked to one CSS framework
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.
- 11d ago First seen · 211 lines · 97 tokens per session scan A 9c58dbe863dd
sigil-messaging is a skill published in the GitHub repository Kevin-Liu-01/Sigil-UI (9 stars, last pushed 1mo ago), licensed MIT. It adds 97 tokens to every session and 2,195 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 2026-08-31.
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