Guide · Agent skill
How to use the UTF-8 Charset Checker agent skill
Updated · written with AI from the project's own documentation and checked against our catalogue data
The charset agent skill tells an AI agent to review web page templates, rendered HTML and shared components for a UTF-8 character encoding declaration. This guide explains what the skill does, how to install it, how to ask for it in plain language, and where its limits are. You will be able to install it, trigger a review, and read the findings it produces.
UTF-8 Charset Checkerthedaviddias/Front-End-Checklist · MIT Download the skill Quick start
- 1Download the ZIP. Get the charset skill ZIP from the directory page.
- 2Unzip into a skills folder. Unzip into ~/.claude/skills/ for personal use, or into the project's .claude/skills/ folder for one project.
- 3Or upload in the Claude apps. Go to Settings → Capabilities → Skills and upload the ZIP.
- 4Ask for a review in plain language. Name the templates, components or rendered pages you want checked and mention UTF-8 or charset.
- 5Read the findings. Check each flagged element and the suggested fix against the expected head layout.
- 6Apply and re-check. Make the change in your template, then ask the agent to review again.
What the charset skill makes the agent do
When installed, the agent reviews web page templates, rendered HTML and shared components to confirm they declare UTF-8 character encoding with a meta charset tag near the top of the head section. It flags missing or late declarations and suggests the fix.
The purpose is to make sure text such as accents and emoji displays correctly instead of as garbled characters. The skill's source notes that a missing or incorrect charset can cause mojibake (garbled text) and broken special characters.
- Checks that the document declares UTF-8 in the head section
- Checks that the declaration sits early in the document
- Flags exact elements or routes where the rendered HTML breaks the rule
- Suggests adding the tag as the first meta tag in the head
<meta charset="UTF-8">Install the charset skill from the ZIP download
Download the ZIP from the directory page for this skill. Then install it using one of the two methods below. Each method places the skill folder where your agent can find it.
For a personal install that applies to all your projects, unzip the download into ~/.claude/skills/. To limit the skill to a single project, unzip it into that project's .claude/skills/ folder instead.
If you use the Claude apps, you can upload the ZIP under Settings → Capabilities → Skills instead.
- Personal: unzip into ~/.claude/skills/
- Single project: unzip into the project's .claude/skills/
- Claude apps: Settings → Capabilities → Skills, then upload the ZIP
Trigger the skill with natural requests
You do not need a special command. Describe the task in plain words that mention templates, HTML, or charset encoding. The skill's description is written around reviewing templates, rendered HTML, or shared components for UTF-8 declarations, so requests close to that wording are the most likely to use it.
Point the agent at the files or components you want checked, and say whether you care about the final browser output.
- Check whether our base layout declares UTF-8 correctly.
- Review these templates for a missing meta charset tag.
- Look at the rendered HTML of the checkout page and tell me if the charset is declared early enough.
- Audit the shared header component for encoding declarations.
Examples of what a correct declaration looks like
The reference file shows a complete head with the charset declared first, followed by the viewport and title. The skill's quick reference says the declaration must appear within the first 1024 bytes of the document.
A typical correct head looks like this. Use it as the target when the agent reports a violation.
- Put the charset tag as the first element in head
- Keep it within the first 1024 bytes of the document
- Use it in every page that outputs HTML
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Your Page Title</title>
</head>Safety notes: scripts and network access
The skill lists no required dependencies. It does not run scripts and does not use the network, according to its listing. Its work consists of reading the templates and HTML you point it at and reporting findings.
Because it does not run code or fetch anything, you can review its output before you apply any suggested change to your files.
- Requires: nothing listed
- Runs scripts: no
- Uses network: no
Tips for getting useful results
Give the agent the rendered output where you can. The skill's description asks for the final browser-facing markup, not only the source framework abstraction, so a template that looks correct may still render a late or missing tag.
The skill covers HTML documents only. It is not a tool for fixing encoding in databases or server code.
- Include rendered HTML, not just template source, when framework layers add markup
- Ask for exact elements and attributes in the report
- Re-run the review after applying the fix
What people use it for
- Reviewing base layout templates before a release of a server-rendered site
- Auditing shared components in a component library for a missing charset tag
- Checking that a rendered page places the meta charset tag within the first 1024 bytes
- Teaching students where the charset declaration belongs in an HTML document
Frequently asked questions
How do I install the charset agent skill?
Download the ZIP from the directory page and unzip it into ~/.claude/skills/ for personal use, or into a project's .claude/skills/ folder. In the Claude apps, you can instead upload the ZIP under Settings → Capabilities → Skills.
Does the charset skill require anything else to run?
The skill's listing shows no required dependencies. It does not run scripts and does not use the network.
Is the charset skill free and what is its licence?
The skill is listed under the MIT licence. The directory page does not list a price, so check the page for any cost details before you install.
Will this skill fix encoding problems in my database?
No. The skill covers browser-facing HTML markup only. Encoding issues in databases or server code are outside its scope.
Where must the meta charset tag go?
It should be the first element in the head, and it must appear within the first 1024 bytes of the document.
What is the difference between this skill and a general HTML validator?
This skill focuses on one rule: that UTF-8 is declared early in the head. A general validator checks many rules; this skill checks this one and explains the fix.
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Our verdict
This skill suits front-end developers, teams auditing server-rendered pages, and students learning HTML document basics. It is not the right choice if you need encoding fixes in databases, server code, or non-HTML output.
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