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Agent skill

Web App Manifest

by thedaviddias in thedaviddias/Front-End-Checklist

A skill your agent uses when reviewing templates, rendered HTML, or shared components related to Link a Web App Manifest for installability.

MITAuto-check passed

Install Web App Manifest

skills CLI
$ npx skills add thedaviddias/Front-End-Checklist --skill web-app-manifest -a claude-code

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

GitHub CLI
$ gh skill install thedaviddias/Front-End-Checklist web-app-manifest --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/web-app-manifest .claude/skills/web-app-manifest && 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
web-app-manifest
GitHub stars
74k
Token cost
~491 tokens
SKILL.md length
216 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 templates, rendered HTML, or shared components related to Link a Web App Manifest for installability.

  • Reviewing templates
  • 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
  • Shared components related to Link a Web App Manifest for installability

What it does

Web App Manifest is an agent skill from thedaviddias/Front-End-Checklist. Use when reviewing templates, rendered HTML, or shared components related to Link a Web App Manifest for installability. Validate the final browser-facing markup, not just the source framework abstraction.

Its SKILL.md is about 490 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 templates
  • Shared components related to Link a Web App Manifest for installability

Example prompts

  • “/web-app-manifest”

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

Web App Manifest loads about 491 tokens when it runs, and up to ~1.6k if it reads all its reference files. Until then it costs about 56 tokens; SKILL.md has 216 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
~491
With references · SKILL.md plus every file in references/, read only if the agent opens them
~1.6k

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). 216 words, ~491 tokens.

Download SKILL.mdSave it as .claude/skills/web-app-manifest/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.
name
web-app-manifest
description
Use when reviewing templates, rendered HTML, or shared components related to Link a Web App Manifest for installability. Validate the final browser-facing markup, not just the source framework abstraction.
metadata.category
html
metadata.priority
medium
metadata.difficulty
beginner
metadata.estimatedTime
20
metadata.source
frontendchecklist.io
metadata.url
https://frontendchecklist.io/rules/html/web-app-manifest

A Web App Manifest is the minimum requirement for a site to be installable as a Progressive Web App. Installed PWAs launch in their own window, appear in app switchers, and can receive push notifications. Even for non-PWA sites, the manifest improves the experience when users bookmark to their home screen and provides metadata for browser share dialogs.

Quick Reference

  • Link manifest.json with <link rel="manifest" href="/manifest.json">
  • Include name, short_name, icons (192px and 512px minimum), and start_url
  • Set display: standalone to hide browser chrome when launched from home screen
  • Set theme_color to control the browser address bar and OS taskbar color

Check

Check if this HTML file has a Web App Manifest linked. If so, verify the manifest has all required fields for installability.

Fix

Create a minimal Web App Manifest with the required fields and link it from the HTML head.

Explain

Explain the Web App Manifest format, which fields are required for installability, and how icons work across different platforms.

Code Review

Review templates, server-rendered HTML, and shared components that output markup related to Link a Web App Manifest for installability. Flag exact elements, attributes, and routes where the rendered HTML violates the rule.

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

Rule page: https://frontendchecklist.io/rules/html/web-app-manifest

© 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/web-app-manifest of thedaviddias/Front-End-Checklist.

  • SKILL.md
  • references/rule.md

Open the folder on GitHubat commit e8d14d0

Compare with similar skills

Web App Manifest 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.

Web App Manifest compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Web App Manifest this skillthedaviddias/Front-End-Checklist74k—~491Automated safety check: PassMIT
RenderLeoYeAI/openclaw-master-skills2.2k—~4.8kAutomated safety check: PassMIT
Markdown Renderingsickn33/agentic-awesome-skills47k1 repos~751Automated safety check: PassMIT
RenderAnil-matcha/awesome-muse-connectors1.3k—~433Automated safety check: PassMIT
Web Renderer Testremotion-dev/remotion63k—~547Automated safety check: PassCustom licence
Generate Manifestgoogle/adk-recipes10k—~2.2kAutomated safety check: PassApache-2.0

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  • Render

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    2.2k GitHub stars~4.8k tokensUpdated 2 mo ago
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    sickn33/agentic-awesome-skills

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  • Generate Manifest

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    Scan an ADK recipe directory and generate a manifest.yaml for it based on the schema at .github/schemas/manifest-schema.json.

    10k GitHub stars~2.2k tokensUpdated yesterday
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All 390 skills in this repo

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  • Favicon Audit and Setup

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  • Content Freshness Signals

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  • Geo Meta Tags Audit

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Questions about Web App Manifest

What does Web App Manifest do?

A skill your agent uses when reviewing templates, rendered HTML, or shared components related to Link a Web App Manifest for installability. Web App Manifest is an agent skill from thedaviddias/Front-End-Checklist. Use when reviewing templates, rendered HTML, or shared components related to Link a Web App Manifest for installability.

When should I use Web App Manifest?

Web App Manifest fits situations like: reviewing templates; shared components related to Link a Web App Manifest for installability.

How do I install Web App Manifest in Claude Code?

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

How do I install Web App Manifest in Codex?

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

Can I use Web App Manifest 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 web-app-manifest -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/web-app-manifest, .gemini/skills/web-app-manifest, .github/skills/web-app-manifest and .opencode/skills/web-app-manifest in your project.

What does Web App Manifest need to run?

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

Does Web App Manifest 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 Web App Manifest 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 Web App Manifest use?

Web App Manifest 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 Web App Manifest use?

About 491 tokens (SKILL.md is roughly 2k 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 1.1k tokens, read only when the agent opens those files.

What are the alternatives to Web App Manifest?

Skills that share tags, products or a category with Web App Manifest: Render (LeoYeAI/openclaw-master-skills, 2.2k stars), Markdown Rendering (sickn33/agentic-awesome-skills, 47k stars), Render (Anil-matcha/awesome-muse-connectors, 1.3k stars) and Web Renderer Test (remotion-dev/remotion, 63k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Web App Manifest?

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.