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 using-saas-principlesgit 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/using-saas-principles)<a href="https://agentmods.dev/skills/oborchers/fractional-cto/using-saas-principles"><img src="https://agentmods.dev/badge/skills/oborchers/fractional-cto/using-saas-principles/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/using-saas-principles"><img src="https://agentmods.dev/badge/skills/oborchers/fractional-cto/using-saas-principles.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 | $0.00075 | $0.00757 |
| Opus 5.5 | $0.00030 | $0.00303 |
| Sonnet 5.5 | $0.00015 | $0.00151 |
| Haiku 4.5 | $0.00007 | $0.00076 |
Grade A, and why
using-saas-principles 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 — 52 lines — stays where its author put it; the contents beside it link to each section on GitHub.
These are not suggestions. They are research-backed, opinionated principles drawn from Linear, Stripe, Intercom, Shopify Polaris, GitHub Primer, IBM Carbon, Atlassian, and decades of Nielsen Norman Group research.
How to Access Skills
Use the Skill tool to invoke any skill by name. When invoked, follow the skill's guidance directly.
Available Skills
| Skill | Triggers On |
|---|---|
saas-design-principles:speed-is-the-feature |
Performance, loading states, optimistic UI, skeleton screens, perceived speed |
saas-design-principles:saas-navigation |
Sidebar nav, command palette (Cmd+K), breadcrumbs, org/workspace switching |
saas-design-principles:progressive-disclosure |
Onboarding flows, empty states, checklists, feature revelation, signup |
saas-design-principles:form-design |
Form validation, auto-save vs explicit save, inline errors, multi-step wizards |
saas-design-principles:notification-hierarchy |
Toasts, banners, modals, inline messages, alert fatigue, feedback |
saas-design-principles:error-handling |
Validation errors, 403s, session expiry, network errors, conflict resolution |
saas-design-principles:data-tables |
Tables, pagination, column alignment, bulk actions, sorting, filtering |
saas-design-principles:permissions-and-settings |
RBAC, invitations, role management, account vs workspace settings |
saas-design-principles:authentication |
Login, MFA, magic links, SSO, session management, GDPR |
saas-design-principles:accessibility |
WCAG 2.2 AA, keyboard navigation, focus management, SPA a11y, ARIA |
saas-design-principles:design-tokens |
Theming, dark mode, CSS variables, token architecture, color naming |
saas-design-principles:saas-responsive |
Breakpoints, mobile layouts, table-to-card conversion, touch targets |
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 · 52 lines · 75 tokens per session scan A 9ffc4f2af331
using-saas-principles is a skill published in the GitHub repository oborchers/fractional-cto (32 stars, last pushed 5d ago), licensed MIT. It adds 75 tokens to every session and 757 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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