Container Lines

What it does

When your agent uses it

• Asked for container lines
• Measured layout guides
• Vertical boundary lines
• Editorial grid markers

Example prompts

• “/container-lines”

Workflow steps

6 steps, taken from the first numbered list in SKILL.md.

1. 1Draw lines at the left and right edges of the main content container.
2. 2Keep lines thin: 1px with low opacity.
3. 3Add mini squares at container corners or section intersections.
4. 4Keep the line system consistent across sections; do not change width per section.
5. 5Place lines behind content but above the page background.
6. 6Disable pointer events so the guides never block UI.

What it can do on your machine

Read from SKILL.md and the folder at commit 645553c. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  No scripts in the folder and no shell commands in SKILL.md (its code samples are css and html).

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  No URLs in SKILL.md.

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names no API keys, tokens, secrets or passwords.

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Container Lines loads about 903 tokens when it runs. Until then it costs about 66 tokens; SKILL.md has 261 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~66

When it runs · the whole SKILL.md, loaded when a task matches

~903

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from boraoztunc/skills at commit 645553c, republished under its Apache-2.0 licence (© boraoztunc). 261 words, ~903 tokens.

name

container-lines

description

Add vertical container-size guide lines with mini corner squares for precise, structured web layouts. Use when asked for container lines, measured layout guides, vertical boundary lines, editorial grid markers, or small corner-square frame details.

:root {
  --container-max: 1120px;
  --container-pad: clamp(20px, 4vw, 48px);
  --line-color: rgba(24, 24, 27, 0.14);
  --line-strong: rgba(24, 24, 27, 0.28);
  --corner-size: 6px;
}

.container-lines {
  position: relative;
  isolation: isolate;
}

.container-lines::before,
.container-lines::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  z-index: -1;
  width: 1px;
  background: var(--line-color);
  pointer-events: none;
}

.container-lines::before {
  left: max(var(--container-pad), calc((100% - var(--container-max)) / 2));
}

.container-lines::after {
  right: max(var(--container-pad), calc((100% - var(--container-max)) / 2));
}

.corner-squares {
  position: relative;
}

.corner-squares > .corner {
  position: absolute;
  width: var(--corner-size);
  height: var(--corner-size);
  background: var(--line-strong);
  pointer-events: none;
}

.corner.top-left { top: 0; left: 0; transform: translate(-50%, -50%); }
.corner.top-right { top: 0; right: 0; transform: translate(50%, -50%); }
.corner.bottom-left { bottom: 0; left: 0; transform: translate(-50%, 50%); }
.corner.bottom-right { right: 0; bottom: 0; transform: translate(50%, 50%); }

<main class="container-lines">
  <section class="corner-squares">
    <span class="corner top-left"></span>
    <span class="corner top-right"></span>
    <span class="corner bottom-left"></span>
    <span class="corner bottom-right"></span>
    ...
  </section>
</main>

.content-container {
  width: min(100% - (var(--container-pad) * 2), var(--container-max));
  margin-inline: auto;
}

© boraoztunc, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in container-lines of boraoztunc/skills.

Open the folder on GitHubat commit 645553c

Used in 2 other repositories

We found 2 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 2 other GitHub owners. This page covers the copy in boraoztunc/skills, which our catalogue first saw on October 7, 2026.

• nirholas/three.wsthird_party/designcode-agent-skills/agent-skills/web-design/container-lines
• MengTo/Skillsagent-skills/web-design/container-lines