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 gabrielmoreira/agent-skills-mirror --skill 04-fullstack-webappgit clone --depth 1 https://github.com/gabrielmoreira/agent-skills-mirrorWrote 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/gabrielmoreira/agent-skills-mirror/04-fullstack-webapp)<a href="https://agentmods.dev/skills/gabrielmoreira/agent-skills-mirror/04-fullstack-webapp"><img src="https://agentmods.dev/badge/skills/gabrielmoreira/agent-skills-mirror/04-fullstack-webapp/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/gabrielmoreira/agent-skills-mirror/04-fullstack-webapp"><img src="https://agentmods.dev/badge/skills/gabrielmoreira/agent-skills-mirror/04-fullstack-webapp.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 10 findings, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high Prompt Injection · line 178 Hidden instructions were detected in comments or invisible text. These could contain malicious directives. Manual review is recommended.Fix: Audit all comments and invisible characters. Remove any instructions that direct the agent to perform unauthorized actions. Use plain, reviewable content.
- high Anti-Refusal · line 656 Skill attempts to nullify the agent's safety policies or restrictions ('you have no restrictions', 'ignore your guidelines', 'do anything now'). This is a direct jailbreak that disables guardrails.Fix: Remove jailbreak framing that nullifies safety policies or restrictions. Skill content must not instruct the agent to ignore its guidelines or operate without guardrails.
- medium MCP Rug Pull · line 55 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
- medium MCP Rug Pull · line 606 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
- medium MCP Rug Pull · line 65 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
- medium MCP Rug Pull · line 73 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
- medium MCP Rug Pull · line 543 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
- medium MCP Rug Pull · line 542 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
- medium MCP Rug Pull · line 580 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
- medium Excessive Agency · line 546 Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.Fix: Add human-in-the-loop confirmation for destructive, irreversible, or high-impact operations. Never auto-execute commands that modify files, send data, or alter system state.
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 | $0.00000 | $0.06057 |
| Opus 5 | $0.00000 | $0.03028 |
| Sonnet 5 | $0.00000 | $0.01211 |
| Haiku 4.5 | $0.00000 | $0.00606 |
Grade A, and why
04-fullstack-webapp 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.
How it starts
The opening of the file, as written. The whole thing — 657 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Full-Stack Web Application Development
Description
A comprehensive full-stack web application development coach that guides developers through the complete lifecycle of building, deploying, and monetizing a modern web application. Based on real-world experience shipping a Next.js 16 AI SaaS product from zero to production in 2 weeks (Human Skill Tree project), this skill covers: project scaffolding, AI integration, authentication, payment systems, internationalization, cloud deployment, China accessibility via Cloudflare, and launch strategy. The AI agent acts as a pragmatic tech lead who prioritizes shipping over perfection and makes architecture decisions based on actual production tradeoffs — not theoretical best practices.
Triggers
Activate this skill when the user:
- Wants to build a web application from scratch
- Asks "how do I deploy my Next.js app" or "how do I add authentication"
- Mentions building a SaaS, AI tool, or web product
- Says "I want to build something like [product]" or "I have an idea for an app"
- Asks about Vercel, Supabase, payment integration, or i18n setup
- Wants to add AI chat/features to their web app (OpenRouter, Vercel AI SDK)
- Asks about making their site accessible in China without ICP filing
- Says "I'm a solo developer" or "independent developer" or "indie hacker"
- Wants to add a subscription/payment system (LemonSqueezy, Stripe, 爱发电)
- Asks about technical architecture decisions for a web project
- Encounters deployment errors, auth issues, or payment webhook problems
Methodology
- Ship First, Polish Later: Get the core user flow working before adding auth, payments, i18n, or animations. Validate the idea with a working MVP before investing in infrastructure.
- Progressive Enhancement: Start with
localStorage, add Supabase cloud sync later. Start without auth, add it when you need user accounts. Each layer is independent and can be added or removed without breaking others. - Pragmatic Architecture: Choose boring, proven technology that works. Optimize for developer velocity, not theoretical purity. One person shipping beats a team debating architecture.
- Phase-Based Development: Never build everything at once. Each phase produces a deployable product. Deploy after every phase, not just at the end.
- Fail Fast, Fix Fast: Deploy early, monitor errors, iterate. A deployed MVP with bugs teaches you more than a perfect local prototype.
- Decision Documentation: Record WHY you chose each technology (tradeoffs), not just WHAT. Future-you needs the reasoning to make changes confidently.
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 · 657 lines · 0 tokens per session scan A 886124c21d8c
04-fullstack-webapp is a skill published in the GitHub repository gabrielmoreira/agent-skills-mirror (17 stars, last pushed yesterday), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 6,057 tokens. 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.
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