LazyCodex is an agent harness for working on complex codebases, combining project memory, planning, execution, and completion checks inside Codex. It is for developers who want structured, repeatable assistance when handling substantial software projects. The catalogue contains the skills, hook, and MCP integration that provide its workflow inside Codex.
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 code-yeongyu/lazycodex --skill layoutgit clone --depth 1 https://github.com/code-yeongyu/lazycodexWrote 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/code-yeongyu/lazycodex/layout)<a href="https://agentmods.dev/skills/code-yeongyu/lazycodex/layout"><img src="https://agentmods.dev/badge/skills/code-yeongyu/lazycodex/layout/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/code-yeongyu/lazycodex/layout"><img src="https://agentmods.dev/badge/skills/code-yeongyu/lazycodex/layout.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 | $0.00088 | $0.02032 |
| Opus 5.5 | $0.00035 | $0.00813 |
| Sonnet 5 | $0.00018 | $0.00406 |
| Haiku 4.5 | $0.00009 | $0.00203 |
Grade A, and why
layout-skill 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 10d 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 — 108 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Layout Mechanics
Style skills decide how a surface looks. This file decides how it is built to hold content — what scrolls, what stays fixed, how regions shrink, and which layouts survive real data. It stacks on top of any Layer A style skill (taste-skill, minimalist-skill, soft-skill, brutalist-skill, gpt-tasteskill) and any Layer B brand. It adds ZERO visual direction — color, type, shadow, radius, and motion still come from the style skill and DESIGN.md.
Load this when the screen is an application shell, not a scroll-the-whole-document marketing page: dashboards, settings, list-detail, mail/inbox, command surfaces, split panes, sidebars — or when a page that looked fine breaks the moment content gets long, empty, or unbroken.
1. Scroll ownership — decide this BEFORE writing layout CSS
The single most common agent-built layout bug is an app shell where the wrong thing scrolls: the whole page scrolls when only a panel should, two panels fight over the scrollbar, or a "fixed" header scrolls away. Prevent it by naming ownership up front, in DESIGN.md and in the component:
- What scrolls? Name the ONE element that owns vertical scroll for this region.
- What stays fixed? Header, sidebar, footer, toolbar — list them.
- Where is height determined? The scroll container needs a bounded height ancestor, or it will grow instead of scroll.
Rules:
- One scroll container per region unless each extra one has a named job. Nested scrollbars with no declared responsibility are a defect — the user loses track of what a wheel/trackpad gesture will move.
- Full-height shells are bounded by
100dvh/100dvb(dynamic viewport units), never100vh—vhcauses the iOS Safari address-bar jump. - A sticky element (
position: sticky) follows document scroll; a fixed shell region (grid row/column withoverflow: autobody) owns its own scroll. Do not mix the two models in one region without reason.
2. The two CSS contracts agents get wrong
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.
- 10d ago First seen · 108 lines · 88 tokens per session scan A bf38b363120c
layout-skill is a skill published in the GitHub repository code-yeongyu/lazycodex (3,593 stars, last pushed today), licensed MIT. It adds 88 tokens to every session and 2,032 once invoked, about $0.0004 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 2026-09-13.
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