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Agent skill

Import On Visibility

by thedaviddias in thedaviddias/Front-End-Checklist

A skill your agent uses when reviewing long pages, dashboards, or content feeds with expensive offscreen modules.

MITAuto-check passed

Install Import On Visibility

skills CLI
$ npx skills add thedaviddias/Front-End-Checklist --skill import-on-visibility -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install thedaviddias/Front-End-Checklist import-on-visibility --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/import-on-visibility .claude/skills/import-on-visibility && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
import-on-visibility
GitHub stars
74k
Token cost
~532 tokens
SKILL.md length
222 words
Files
2 (incl. references)
Skills in repo
390
Repo updated
First seen
Licence
MIT

At a glance

A skill your agent uses when reviewing long pages, dashboards, or content feeds with expensive offscreen modules.

  • Reviewing long pages
  • SKILL.md covers Quick Reference, Check, Fix and Explain, plus 1 more section
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • Content feeds with expensive offscreen modules

What it does

Import On Visibility is an agent skill from thedaviddias/Front-End-Checklist. Use when reviewing long pages, dashboards, or content feeds with expensive offscreen modules. Balance early enough loading for smooth scrolling against keeping the initial route light.

Its SKILL.md is about 530 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including reference files (for example `references/rule.md`).

The repository describes itself as: 🗂 The essential checklist for modern web development, for humans and AI agents. The licence is MIT.

When your agent uses it

  • Reviewing long pages
  • Content feeds with expensive offscreen modules

Example prompts

  • “/import-on-visibility”

What it can do on your machine

Read from SKILL.md and the folder at commit e8d14d0. 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.

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

  • Network

    Links to these hosts (documentation or services it may open):

    • frontendchecklist.io

    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

Import On Visibility loads about 532 tokens when it runs, and up to ~1.5k if it reads all its reference files. Until then it costs about 51 tokens; SKILL.md has 222 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~51
When it runs · the whole SKILL.md, loaded when a task matches
~532
With references · SKILL.md plus every file in references/, read only if the agent opens them
~1.5k

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

Auto-check passed

The automated check found no risky patterns in SKILL.md.

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 thedaviddias/Front-End-Checklist at commit e8d14d0, republished under its MIT licence (© thedaviddias). 222 words, ~532 tokens.

Download SKILL.mdSave it as .claude/skills/import-on-visibility/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.
name
import-on-visibility
description
Use when reviewing long pages, dashboards, or content feeds with expensive offscreen modules. Balance early enough loading for smooth scrolling against keeping the initial route light.
metadata.category
performance
metadata.priority
high
metadata.difficulty
intermediate
metadata.estimatedTime
20
metadata.source
frontendchecklist.io
metadata.url
https://frontendchecklist.io/rules/performance/import-on-visibility

Load non-critical code when content approaches the viewport

Many pages ship JavaScript for offscreen sections that a user may never reach. Import-on-visibility keeps the initial route lighter while still loading content early enough to feel ready when users scroll to it.

Quick Reference

  • Use Intersection Observer to start loading code before an offscreen section becomes visible
  • Reserve space with placeholders or skeletons so deferred sections do not cause layout shift
  • Tune rootMargin so heavy content loads early enough without competing with above-the-fold work
  • Use this for charts, reviews, related products, embeds, and offscreen dashboards

Check

Identify components, widgets, or modules that load on first render even though they only appear after the user scrolls. Flag which ones can switch to visibility-based loading.

Fix

Use Intersection Observer or an equivalent framework primitive to load the offscreen component or dependency when it approaches the viewport, while preserving layout stability and a clear placeholder.

Explain

Explain import-on-visibility, how it differs from import-on-interaction, and how viewport-based loading helps large pages stay fast.

Code Review

Inspect scroll-triggered sections, embeds, charts, recommendation modules, and long landing pages. Flag code that is bundled eagerly even though the corresponding UI stays offscreen until later, and verify the deferred version still loads before the user reaches it.

For full implementation details, code examples, and framework-specific guidance, see references/rule.md.

Rule page: https://frontendchecklist.io/rules/performance/import-on-visibility

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

Files

SKILL.md and 1 other file (references) in skills/import-on-visibility of thedaviddias/Front-End-Checklist.

  • SKILL.md
  • references/rule.md

Open the folder on GitHubat commit e8d14d0

Compare with similar skills

Import On Visibility next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Import On Visibility compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Import On Visibility this skillthedaviddias/Front-End-Checklist74k—~532Automated safety check: PassMIT
Importasgeirtj/system_prompts_leaks69k—~3.5kAutomated safety check: PassCC0-1.0
Dashboardasgeirtj/system_prompts_leaks69k—~4.1kAutomated safety check: PassCC0-1.0
DashboardInsForge/InsForge13k—~2.3kAutomated safety check: PassApache-2.0
Live DashboardNousResearch/hermes-agent252k—~2.1kAutomated safety check: PassMIT
Live Dashboardnexu-io/open-design100k—~2.1kAutomated safety check: PassApache-2.0

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Questions about Import On Visibility

What does Import On Visibility do?

A skill your agent uses when reviewing long pages, dashboards, or content feeds with expensive offscreen modules. Import On Visibility is an agent skill from thedaviddias/Front-End-Checklist. Use when reviewing long pages, dashboards, or content feeds with expensive offscreen modules.

When should I use Import On Visibility?

Import On Visibility fits situations like: reviewing long pages; content feeds with expensive offscreen modules.

How do I install Import On Visibility in Claude Code?

Run `npx skills add thedaviddias/Front-End-Checklist --skill import-on-visibility -a claude-code`. Or copy the skill folder (skills/import-on-visibility in thedaviddias/Front-End-Checklist) into .claude/skills/import-on-visibility in your project. Claude Code loads it when a task matches its description.

How do I install Import On Visibility in Codex?

Run `npx skills add thedaviddias/Front-End-Checklist --skill import-on-visibility -a codex`. Or copy the skill folder (skills/import-on-visibility in thedaviddias/Front-End-Checklist) into .agents/skills/import-on-visibility in your project. Codex loads it when a task matches its description.

Can I use Import On Visibility in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add thedaviddias/Front-End-Checklist --skill import-on-visibility -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/import-on-visibility, .gemini/skills/import-on-visibility, .github/skills/import-on-visibility and .opencode/skills/import-on-visibility in your project.

What does Import On Visibility need to run?

SKILL.md names no scripts, command-line tools or credentials: Import On Visibility is instructions for the agent only.

Does Import On Visibility access the network?

SKILL.md names 1 domain. As links in the text: frontendchecklist.io. This is read from the text; nothing was executed.

Is Import On Visibility safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Import On Visibility use?

Import On Visibility is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Import On Visibility use?

About 532 tokens (SKILL.md is roughly 2.1k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 928 tokens, read only when the agent opens those files.

What are the alternatives to Import On Visibility?

Skills that share tags, products or a category with Import On Visibility: Import (asgeirtj/system_prompts_leaks, 69k stars), Dashboard (asgeirtj/system_prompts_leaks, 69k stars), Dashboard (InsForge/InsForge, 13k stars) and Live Dashboard (NousResearch/hermes-agent, 252k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Import On Visibility?

thedaviddias (a GitHub user) maintains it in thedaviddias/Front-End-Checklist, which has 74,421 GitHub stars. The repository holds 390 skills in this directory. The repository was last updated on October 6, 2026.

Source: thedaviddias/Front-End-Checklist on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.