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Agent skill

Flexbox Patterns

by thedaviddias in thedaviddias/Front-End-Checklist

A skill your agent uses when reviewing stylesheets, component styles, and responsive behavior related to Apply Flexbox best practices.

MITAuto-check passedFrontend & Design

Install Flexbox Patterns

skills CLI
$ npx skills add thedaviddias/Front-End-Checklist --skill flexbox-patterns -a claude-code

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

GitHub CLI
$ gh skill install thedaviddias/Front-End-Checklist flexbox-patterns --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/flexbox-patterns .claude/skills/flexbox-patterns && 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
flexbox-patterns
GitHub stars
74k
Token cost
~479 tokens
SKILL.md length
201 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 stylesheets, component styles, and responsive behavior related to Apply Flexbox best practices.

  • Reviewing stylesheets
  • 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
  • Component styles

What it does

Flexbox Patterns is an agent skill from thedaviddias/Front-End-Checklist. Use when reviewing stylesheets, component styles, and responsive behavior related to Apply Flexbox best practices. Check the rendered layout across breakpoints and interaction states before proposing a fix.

Its SKILL.md is about 480 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`).

It sits in Frontend & Design, covering CSS and styling. 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 stylesheets
  • Component styles
  • Responsive behavior related to Apply Flexbox best practices

Example prompts

  • “/flexbox-patterns”

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

Flexbox Patterns loads about 479 tokens when it runs, and up to ~1.4k if it reads all its reference files. Until then it costs about 56 tokens; SKILL.md has 201 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~56
When it runs · the whole SKILL.md, loaded when a task matches
~479
With references · SKILL.md plus every file in references/, read only if the agent opens them
~1.4k

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). 201 words, ~479 tokens.

Download SKILL.mdSave it as .claude/skills/flexbox-patterns/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.
name
flexbox-patterns
description
Use when reviewing stylesheets, component styles, and responsive behavior related to Apply Flexbox best practices. Check the rendered layout across breakpoints and interaction states before proposing a fix.
metadata.category
css
metadata.priority
medium
metadata.difficulty
intermediate
metadata.estimatedTime
20
metadata.source
frontendchecklist.io
metadata.url
https://frontendchecklist.io/rules/css/flexbox-patterns

Apply Flexbox best practices

Flexbox is one of the most used CSS features, but its unintuitive default values (flex-shrink:1, min-width:auto) cause layout bugs that are hard to diagnose. Understanding the flex shorthand and the min-width:0 fix prevents the most common Flexbox breakage scenarios.

Quick Reference

  • Flexbox is for one-dimensional layouts (a row OR a column)
  • Use flex: 1 1 0 (shorthand: flex:1) for equal-width items that fill space
  • Add min-width: 0 to flex children when text overflow truncation doesn't work
  • Use gap instead of margin for spacing between flex items

Check

Review this CSS for common Flexbox mistakes: missing min-width:0 on text-containing flex children, using margin instead of gap for spacing, and improper flex shorthand usage.

Fix

Fix the Flexbox layout issues: add min-width:0 where needed, replace inter-item margins with gap, and correct flex shorthand values.

Explain

Explain how flex-grow, flex-shrink, and flex-basis work, what the flex shorthand means, and why min-width:0 fixes text overflow in flex layouts.

Code Review

Review stylesheets, component styles, and responsive states related to Apply Flexbox best practices. Flag exact selectors, declarations, or breakpoints that violate the rule in the rendered UI.

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

Rule page: https://frontendchecklist.io/rules/css/flexbox-patterns

© 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/flexbox-patterns of thedaviddias/Front-End-Checklist.

  • SKILL.md
  • references/rule.md

Open the folder on GitHubat commit e8d14d0

Compare with similar skills

Flexbox Patterns 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.

Flexbox Patterns compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Flexbox Patterns this skillthedaviddias/Front-End-Checklist74k—~479Automated safety check: PassMIT
Tailwindcss Developmentanonaddy/anonaddy4.9k10 repos~865Automated safety check: PassMIT
UI StylingOhh-889/skyroc79513 repos~2.5kAutomated safety check: PassMIT
MCP Developmentcoollabsio/coolify63k1 repos~949Automated safety check: PassMIT
Web Animation DesignbaptisteArno/typebot.io11k2 repos~2.7kAutomated safety check: PassCustom licence
UI UX Pro Maxsaoudi-h/solar-icons18418 repos~11kAutomated safety check: NotesCustom licence

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Categories

Questions about Flexbox Patterns

What does Flexbox Patterns do?

A skill your agent uses when reviewing stylesheets, component styles, and responsive behavior related to Apply Flexbox best practices. Flexbox Patterns is an agent skill from thedaviddias/Front-End-Checklist. Use when reviewing stylesheets, component styles, and responsive behavior related to Apply Flexbox best practices.

When should I use Flexbox Patterns?

Flexbox Patterns fits situations like: reviewing stylesheets; component styles; responsive behavior related to Apply Flexbox best practices.

How do I install Flexbox Patterns in Claude Code?

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

How do I install Flexbox Patterns in Codex?

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

Can I use Flexbox Patterns 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 flexbox-patterns -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/flexbox-patterns, .gemini/skills/flexbox-patterns, .github/skills/flexbox-patterns and .opencode/skills/flexbox-patterns in your project.

What does Flexbox Patterns need to run?

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

Does Flexbox Patterns 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 Flexbox Patterns 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 Flexbox Patterns use?

Flexbox Patterns 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 Flexbox Patterns use?

About 479 tokens (SKILL.md is roughly 1.9k 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 876 tokens, read only when the agent opens those files.

What are the alternatives to Flexbox Patterns?

Skills that share tags, products or a category with Flexbox Patterns: Tailwindcss Development (anonaddy/anonaddy, 4.9k stars), UI Styling (Ohh-889/skyroc, 795 stars), MCP Development (coollabsio/coolify, 63k stars) and Web Animation Design (baptisteArno/typebot.io, 11k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Flexbox Patterns?

thedaviddias (a GitHub user) maintains it in thedaviddias/Front-End-Checklist, which has 74,398 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.