Borrowing it
Nothing to install: this file belongs to the-sid-dani/second-brain-os. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/the-sid-dani/second-brain-os/main/.claude/skills/design-saas-landing/SKILL.mdgit clone --depth 1 https://github.com/the-sid-dani/second-brain-osWrote 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/the-sid-dani/second-brain-os/design-saas-landing)<a href="https://agentmods.dev/skills/the-sid-dani/second-brain-os/design-saas-landing"><img src="https://agentmods.dev/badge/skills/the-sid-dani/second-brain-os/design-saas-landing/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/the-sid-dani/second-brain-os/design-saas-landing"><img src="https://agentmods.dev/badge/skills/the-sid-dani/second-brain-os/design-saas-landing.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 | $0.00071 | $0.00871 |
| Opus 5 | $0.00036 | $0.00436 |
| Sonnet 5 | $0.00014 | $0.00174 |
| Haiku 4.5 | $0.00007 | $0.00087 |
Grade A, and why
design-saas-landing 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 10d 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 — 75 lines — stays where its author put it; the contents beside it link to each section on GitHub.
SaaS Landing Skill
Produce a single-page SaaS landing. Agent, follow this workflow exactly.
1. Read context
Before writing anything:
- Read
DESIGN.mdin the current working directory. If missing, stop and ask for one. - Identify the color palette, typography tokens, and layout principles.
- Note the "Agent Prompt Guide" section — it overrides any instruction here if they conflict.
2. Plan sections
Required sections, in order:
- Hero — logo-or-wordmark, headline (tagline input), subhead (1–2 sentences), primary CTA, secondary CTA. Use the hero_density parameter as vertical padding in px.
- Features — 3–6 feature tiles. Each: icon, short title, 1–2 sentence body.
- Social proof —
proof_countlogos or testimonials. If 0, skip this section. - Pricing — 2–3 tiers. Include only if
has_pricingis true. - Footer CTA — large accent-colored band with one-button call to action.
- Footer — minimal: links + copyright.
3. Apply design system
- All colors must come from DESIGN.md tokens. Do not invent hex values.
- Typography: use the declared display font for headlines, body font for everything else.
- Layout: respect the grid, max-width, and section spacing rules.
- Components: use declared button/card/input patterns. Do not add shadows if DESIGN.md's Depth & Elevation says minimal.
- Accent: use the accent color only once in the hero, once in the footer CTA, and for all links. Do not flood the page.
4. Write the file
Output a single self-contained index.html with:
- All CSS inlined in a
<style>block in<head>. - System font fallbacks if DESIGN.md fonts aren't loadable from Google Fonts etc.
- No external JS.
- Semantic HTML (
<header>,<main>,<section>,<footer>). - Each editable element tagged with
data-od-id="<unique-slug>"so the host app's comment mode can target it.
5. Self-check
Before finishing, verify:
- All text is content-meaningful, not lorem ipsum (use product_name and tagline inputs; generate plausible specific copy for the rest).
- No broken color references (every CSS color value is in DESIGN.md's palette or a valid alpha/fallback variant).
- Responsive breakpoints match DESIGN.md's Responsive Behavior section.
- The page looks good at 1440w, 768w, and 375w (mentally simulate).
- Accent used no more than twice total.
What ships with it
1 file 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.
- 10d ago First seen · 75 lines · 71 tokens per session scan A d296fce2c458
design-saas-landing is a skill published in the GitHub repository the-sid-dani/second-brain-os (3 stars, last pushed 1mo ago), licensed MIT. It adds 71 tokens to every session and 871 once invoked, about $0.0004 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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