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 kostja94/marketing-skills --skill signup-logingit clone --depth 1 https://github.com/kostja94/marketing-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/kostja94/marketing-skills/signup-login)<a href="https://agentmods.dev/skills/kostja94/marketing-skills/signup-login"><img src="https://agentmods.dev/badge/skills/kostja94/marketing-skills/signup-login/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/kostja94/marketing-skills/signup-login"><img src="https://agentmods.dev/badge/skills/kostja94/marketing-skills/signup-login.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00072 | $0.01314 |
| Opus 5 | $0.00036 | $0.00657 |
| Sonnet 5 | $0.00014 | $0.00263 |
| Haiku 4.5 | $0.00007 | $0.00131 |
Grade A, and why
signup-login-page-generator 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 9d 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.
Copies of this mod
2 near-identical copies found in the catalogue:
- signup-login-page-generator — 100% identical, 0 lines differ
- signup-login-page-generator — 100% identical, 0 lines differ
How it starts
The opening of the file, as written. The whole thing — 108 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Pages: Signup / Login
Guides signup and login page structure, domain choice, modal vs dedicated page, discount integration, and SEO. Signup is the conversion endpoint from landing pages and pricing; when discounts apply at registration (e.g., student discount), signup is the P0 placement. Distinct from landing-page-generator (acquisition); newsletter-signup-generator (email capture only).
When invoking: On first use, if helpful, open with 1–2 sentences on what this skill covers and why it matters, then provide the main output. On subsequent use or when the user asks to skip, go directly to the main output.
Initial Assessment
Check for project context first: If .claude/project-context.md or .cursor/project-context.md exists, read it for product, audience, and offers.
Identify:
- Goal: Account creation, trial, paid signup
- Discounts: Student, annual, promo code—apply at signup?
- Auth: Self-built vs third-party (Auth0, Clerk, etc.)
- Audience: General vs segmented (students, startups)
Domain & URL
| Option | Use |
|---|---|
| Main domain | /signup, /login, /auth; simple; common for SaaS |
| Subdomain | auth.example.com; Universal Login pattern; credentials not cross-origin; requires Cookie domain config for cross-subdomain session |
| Third-party | Redirect to Auth0, Clerk, etc.; provider hosts auth |
Paths: /signup, /login, /register, /auth; keep short and consistent.
Modal vs Dedicated Page
| Approach | Use |
|---|---|
| Dedicated page | Account creation; discount verification; student verification; higher-quality leads; fewer fake emails |
| Modal / popup | Lightweight lead capture; newsletter; quick demo request; lower quality, higher volume |
When discount applies at signup (e.g., student 30% off): Use dedicated page—user needs space for verification, discount display, and form. Modal can work for simple email-only capture; avoid for full account + verification flows.
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.
- 9d ago First seen · 108 lines · 72 tokens per session scan A 996e2726fb69
signup-login-page-generator is a skill published in the GitHub repository kostja94/marketing-skills (967 stars, last pushed 3mo ago), licensed MIT. It adds 72 tokens to every session and 1,314 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 2026-09-03.
Other skills, from other repositories
landing-page-generator
Generates high-converting Next.js/React landing pages with Tailwind CSS. Uses PAS, AIDA, and BAB frameworks for optimized copy/components (Heroes, Features, Pricing). Focuses on Core Web Vitals/SEO.
pitch-deck-web
Build a responsive, interactive pitch-deck website from a brand book + a PRD/example deck. Use when the user asks to "build a pitch deck", "make an investor deck", "create a sales deck", generate a deck site from a brand book, or scaffold a deck from a PRD or existing slides. Pulls brand tokens (colors, typography…
SEO Content Optimizer
Analyzes and rewrites content to maximize search engine visibility without sounding robotic.
web-vitals
Measure a live page's real Core Web Vitals online via Google PageSpeed Insights (Lighthouse lab + CrUX field data) and turn the result into a prioritized, falsifiable fix list. Use when asked to "check web vitals", "run a PageSpeed / Lighthouse test", "what is the LCP/INP/CLS of this page", "is this page fast", "page…
audit-speed
Deep Core Web Vitals and page speed audit. Use when the user asks about page speed, Core Web Vitals, LCP, CLS, INP, FCP, TTFB, Lighthouse scores, why a page is slow, performance optimization, or resource size analysis. For broader technical SEO issues, see diagnose-seo.
animate
Review a feature and enhance it with purposeful animations, micro-interactions, and motion effects that improve usability and delight. Use when the user mentions adding animation, transitions, micro-interactions, motion design, hover effects, or making the UI feel more alive.