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Agent skill

Favicon Audit and Setup

by thedaviddias in thedaviddias/Front-End-Checklist

Checks that a site's favicon is linked, reachable and large enough for Google search results, and sets up ICO, SVG and Apple touch icon files when they are missing.

MITAuto-check passedFrontend & Design

Install Favicon Audit and Setup

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

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

GitHub CLI
$ gh skill install thedaviddias/Front-End-Checklist favicon --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/favicon .claude/skills/favicon && 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
favicon
GitHub stars
74k
Token cost
~731 tokens
SKILL.md length
341 words
Files
2 (incl. references)
Skills in repo
390
Repo updated
First seen
Licence
MIT

At a glance

Checks that a site's favicon is linked, reachable and large enough for Google search results, and sets up ICO, SVG and Apple touch icon files when they are missing.

  • Works in 6 steps: Create favicon files → Place them in the root or /public… → Add to → …
  • Auditing why a site's icon does not appear in Google mobile results
  • 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

What it does

Google can show a site's icon beside mobile search results, but only if the page head points to a favicon that is served over HTTPS, returns a 200 response, is not blocked by robots.txt and is at least 48 by 48 pixels. In check mode the agent looks for icon link tags in the page head and verifies each of those conditions, plus the presence of a PNG or SVG alongside the ICO fallback. In code review mode it also flags sites that rely on a favicon.ico at the root with no explicit link tag, since browser default discovery is less reliable.

The fix steps create `favicon.ico` with 16 and 32 pixel sizes, a scalable `favicon.svg`, and a 180 by 180 `apple-touch-icon.png`, place them in the site root or `/public`, and add the three matching link tags to the head. The agent then confirms the URL returns 200, checks robots.txt, and suggests testing with the URL Inspection tool in Search Console. A reference file holds fuller implementation notes and framework-specific guidance.

When your agent uses it

  • Auditing why a site's icon does not appear in Google mobile results
  • Setting up favicon files and link tags for a new project
  • Reviewing a page head for missing or incorrect icon declarations

Example prompts

  • “Check whether example.com has a correctly configured favicon.”
  • “Add favicon.ico, favicon.svg and an Apple touch icon to my Next.js app's public folder and head.”
  • “Review the layout template and flag any problem with the icon links.”

Workflow steps

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

  1. Create favicon files
  2. Place them in the root or /public directory.
  3. Add to
  4. Verify the favicon URL returns a 200 response (not 404).
  5. Check that /robots.txt does not block the favicon path.
  6. Test Google's display using the URL Inspection tool in Search Console.

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 (its code samples are html).

    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

Favicon Audit and Setup loads about 731 tokens when it runs, and up to ~1.6k if it reads all its reference files. Until then it costs about 46 tokens; SKILL.md has 341 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~46
When it runs · the whole SKILL.md, loaded when a task matches
~731
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). 341 words, ~731 tokens.

Download SKILL.mdSave it as .claude/skills/favicon/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.
name
favicon
description
Use when checking whether a site has a correctly configured favicon, auditing `<link rel='icon'>` tags in the `<head>`, or setting up favicon infrastructure for a new project.
metadata.category
seo
metadata.priority
medium
metadata.difficulty
intermediate
metadata.estimatedTime
10
metadata.source
frontendchecklist.io
metadata.url
https://frontendchecklist.io/rules/seo/favicon

Add a favicon to every page

Google displays favicons next to search results on mobile devices, making your brand immediately recognisable in the SERP. A missing or inaccessible favicon prevents Google from showing it, reducing visual brand presence in search.

Quick Reference

  • Provide a <link rel="icon"> pointing to a favicon file; Google uses it to identify your site in search results
  • Serve the favicon via HTTPS, ensure it is publicly accessible (not blocked by robots.txt), and at least 48×48px for Google's use
  • Include both an ICO fallback and SVG/PNG versions for broad browser and device compatibility

Check

In the page <head>, look for <link rel="icon"> or <link rel="shortcut icon"> elements. Verify: (1) The href points to an accessible URL (returns 200, not blocked by robots.txt). (2) The file is at least 48×48px (for Google Search use). (3) A PNG or SVG version is provided alongside the ICO fallback. (4) The favicon is accessible over HTTPS.

Fix

  1. Create favicon files:
    • favicon.ico (16×16 and 32×32, ICO format) — legacy browser fallback
    • favicon.svg (scalable, modern browsers)
    • apple-touch-icon.png (180×180 PNG) — iOS home screen
  2. Place them in the root or /public directory.
  3. Add to <head>:
    html
    <link rel="icon" href="/favicon.ico" sizes="any">
<link rel="icon" href="/favicon.svg" type="image/svg+xml">
<link rel="apple-touch-icon" href="/apple-touch-icon.png">
  4. Verify the favicon URL returns a 200 response (not 404).
  5. Check that /robots.txt does not block the favicon path.
  6. Test Google's display using the URL Inspection tool in Search Console.
Show full SKILL.md (116 more words)Show less

Explain

Favicons appear next to your site's name in browser tabs, bookmarks, and Google Search mobile results. Google explicitly states it uses the favicon from <link rel='icon'> for display in search results. A missing, blocked, or too-small favicon means Google cannot show your brand icon, reducing search result click-through rate.

Code Review

Check the <head> for <link rel='icon'> and <link rel='apple-touch-icon'>. Verify the href values are valid relative or absolute paths. Confirm the favicon files exist and return HTTP 200. Flag if only favicon.ico at site root is used without an explicit <link> element (relying on browser default discovery is less reliable).

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

Rule page: https://frontendchecklist.io/rules/seo/favicon

© 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/favicon of thedaviddias/Front-End-Checklist.

  • SKILL.md
  • references/rule.md

Open the folder on GitHubat commit e8d14d0

Compare with similar skills

Favicon Audit and Setup 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.

Favicon Audit and Setup compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Favicon Audit and Setup this skillthedaviddias/Front-End-Checklist74k—~731Automated safety check: PassMIT
SEO GoogleAgriciDaniel/codex-seo7992 repos~3.4kAutomated safety check: PassMIT
SEO Coachakseolabs-seo/seo-coach146—~2.8kAutomated safety check: PassNone
Google SEO APIsAgriciDaniel/claude-seo19k1 repos~4.2kAutomated safety check: PassMIT
Qiaomu SEOjoeseesun/qiaomu-seo441—~2.6kAutomated safety check: PassMIT
SEO Setupalisamadiii/Portfolio180—~1.7kAutomated safety check: PassNone

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Works with

Categories

Questions about Favicon Audit and Setup

What does Favicon Audit and Setup do?

Checks that a site's favicon is linked, reachable and large enough for Google search results, and sets up ICO, SVG and Apple touch icon files when they are missing. txt and is at least 48 by 48 pixels. In check mode the agent looks for icon link tags in the page head and verifies each of those conditions, plus the presence of a PNG or SVG alongside the ICO fallback.

When should I use Favicon Audit and Setup?

Favicon Audit and Setup fits situations like: auditing why a site's icon does not appear in Google mobile results; setting up favicon files and link tags for a new project; reviewing a page head for missing or incorrect icon declarations.

How do I install Favicon Audit and Setup in Claude Code?

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

How do I install Favicon Audit and Setup in Codex?

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

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

What does Favicon Audit and Setup need to run?

SKILL.md names no scripts, command-line tools or credentials: Favicon Audit and Setup is instructions for the agent only.

Does Favicon Audit and Setup 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 Favicon Audit and Setup 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 Favicon Audit and Setup use?

Favicon Audit and Setup 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 Favicon Audit and Setup use?

About 731 tokens (SKILL.md is roughly 2.9k 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 908 tokens, read only when the agent opens those files.

What are the alternatives to Favicon Audit and Setup?

Skills that share tags, products or a category with Favicon Audit and Setup: SEO Google (AgriciDaniel/codex-seo, 799 stars), SEO Coach (akseolabs-seo/seo-coach, 146 stars), Google SEO APIs (AgriciDaniel/claude-seo, 19k stars) and Qiaomu SEO (joeseesun/qiaomu-seo, 441 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Favicon Audit and Setup?

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.