A set of instructions for building websites with standard HTML5 and CSS3, without a frontend framework. It requires the first response to announce a specific active coding agent and asks for clarification when requirements are unclear.

Use it for static websites, email templates, or other interfaces where plain HTML and CSS are appropriate, with attention to performance and clean code.

It gives the agent a defined process for producing semantic, maintainable web pages while avoiding unnecessary dependencies.

html5-css — Command by MN-Lizard-Team

Install

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.

agentmods

npx agentmods add commands/mn-lizard-team/aiyu-multi-agent/html5-css

Clone the repo

git clone --depth 1 https://github.com/MN-Lizard-Team/aiyu-multi-agent

Made for: Cursor.

Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 450 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Token cost

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	$0.00000	$0.00450
Opus 5	$0.00000	$0.00225
Sonnet 5	$0.00000	$0.00090
Haiku 4.5	$0.00000	$0.00045

Measured 3d ago against content hash d8dfa18bc156, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

html5-css 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 3d 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.

.cursor/commands/html5-css.md · 80 lines

What it actually says

/html5-css

HTML5/CSS3 vanilla web development — semantic markup, modern CSS, and zero frameworks. Used for maximum performance, static sites, or email templates.

⚠️ CURSOR OUTPUT CONTRACT

You MUST start your FIRST response with this exact agent activation line:

🤖 **Active Agent: `html5-css-developer`** | Skills: `clean-code, frontend-design, web-design-guidelines`

If this line is missing from your response, you are violating the protocol. Add it before any other content.

Required Behavior

Read the agent's full instructions from .windsurf/agents/html5-css-developer.md (or .cursor/rules/agents/html5-css-developer.mdc)
Apply the Socratic Gate: ask clarifying questions before coding if requirements are unclear
Follow clean-code principles: concise, no over-engineering, self-documenting

/html5-css — Vanilla Web Development

$ARGUMENTS

🤖 Agent Activation

MANDATORY: Before starting any work, announce the active agent to the user.

🤖 **Active Agent: `html5-css-developer`** | Skills: `clean-code, frontend-design, web-design-guidelines`

Task

Build semantic, performant web experiences without JavaScript frameworks.

Steps:

Semantic HTML
- Proper document structure
- Accessibility landmarks
- SEO-friendly markup
Modern CSS
- CSS custom properties
- Grid + Flexbox layouts
- Container queries
- Logical properties
Vanilla JS (when needed)
- Modern selectors
- Event delegation
- Intersection Observer
- Fetch API
Performance
- Critical CSS inline
- Lazy loading
- Font optimization
- No render-blocking

Usage Examples

/html5-css build semantic landing page
/html5-css create responsive grid layout
/html5-css optimize for Core Web Vitals
/html5-css build email template
/html5-css implement dark mode toggle

Changes

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.

3d ago First seen · 80 lines · 0 tokens per session scan A d8dfa18bc156

Subscribe to this mod's changes

html5-css is a command published in the GitHub repository MN-Lizard-Team/aiyu-multi-agent (7 stars, last pushed 3mo ago), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 450 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 2026-08-31.

AI Platform CSS and styling Frontend agent-framework agent-orchestration ai ai-agents ai-automation

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html5-css