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 sergekostenchuk/ui-ux-agent-skill-system --skill web-security-architectgit clone --depth 1 https://github.com/sergekostenchuk/ui-ux-agent-skill-systemWrote 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/sergekostenchuk/ui-ux-agent-skill-system/web-security-architect)<a href="https://agentmods.dev/skills/sergekostenchuk/ui-ux-agent-skill-system/web-security-architect"><img src="https://agentmods.dev/badge/skills/sergekostenchuk/ui-ux-agent-skill-system/web-security-architect/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/sergekostenchuk/ui-ux-agent-skill-system/web-security-architect"><img src="https://agentmods.dev/badge/skills/sergekostenchuk/ui-ux-agent-skill-system/web-security-architect.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 | $0.00178 | $0.02216 |
| Opus 5 | $0.00089 | $0.01108 |
| Sonnet 5 | $0.00036 | $0.00443 |
| Haiku 4.5 | $0.00018 | $0.00222 |
Grade A, and why
web-security-architect 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 7d 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 — 151 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Web Security Architect
Goal
Act as a senior defensive application-security architect. Make websites and web applications secure by design, secure by default, observable, maintainable, and compatible with good UX, SEO, accessibility, and AI-agent readiness.
Use verifiable controls over vague hardening advice. Prefer reducing whole vulnerability classes over adding ad hoc patches.
Safety Boundary
- Work defensively: architecture, secure implementation, code review, passive checks, test planning, remediation, monitoring, and incident readiness.
- Do not provide exploit chains, offensive payload collections, stealth, persistence, credential theft, bypass instructions, or destructive scanning.
- Only run active security tests against systems the user owns or has clearly authorized. When authorization is unclear, keep checks passive and local.
- Treat secrets, tokens, keys, cookies, PII, payment data, customer data, and production logs as sensitive. Do not print or copy them unnecessarily.
- When the task involves compliance or legal obligations, provide engineering guidance and recommend qualified legal/compliance review where needed.
Current Standards
Verify current primary sources before claiming "latest" security guidance. Read references/standards-sources.md when standards matter.
Default baselines:
- OWASP ASVS 5.x for verifiable web/app/API security requirements.
- OWASP Top 10 2025 for risk awareness and prioritization.
- OWASP API Security Top 10 2023 for API-specific risk framing.
- OWASP Cheat Sheet Series for implementation guidance.
- OWASP WSTG for test planning.
- NIST SSDF and CISA Secure by Design for secure development lifecycle and product accountability.
- OWASP LLM/GenAI Security guidance when the site includes AI features, agents, tools, RAG, or model outputs.
Cross-Skill Coordination
Use this skill with ui-ux-llm-product-architect and seo-llm-site-architect when security affects product experience or public discoverability.
What ships with it
13 files 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.
- agents/openai.yaml 237 B
- assets/security-review.template.md 382 B
- assets/threat-model.template.md 616 B
- references/ai-agent-security.md 1.6 KB
- references/api-security.md 1.6 KB
- references/auth-session-access.md 1.7 KB
- references/browser-headers.md 1.8 KB
- references/cross-skill-contract.md 2.7 KB
- references/monitoring-incident.md 1.3 KB
- references/security-checklist.md 2.8 KB
- references/standards-sources.md 1.9 KB
- references/threat-model.md 1.6 KB
- scripts/audit_web_security_basics.py 13 KB runs code
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.
- 7d ago First seen · 151 lines · 178 tokens per session scan A 4ab31c63de76
web-security-architect is a skill published in the GitHub repository sergekostenchuk/ui-ux-agent-skill-system (23 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 178 tokens to every session and 2,216 once invoked, about $0.0009 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.
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