Guide · Agent skill
How to use the Image Button Alt Text Checker agent skill
Updated · written with AI from the project's own documentation and checked against our catalogue data
The Image Button Alt Text Checker is an agent skill, a packaged set of instructions that an AI agent such as Claude can load when a task matches it. This skill teaches the agent to review web page markup for image buttons, which are input elements of type image, and to check that each one has a non-empty alt attribute that describes the action. After this guide you will know what the skill does, how to install it, how to ask for it in plain language, and what its limits are.
Image Button Alt Text Checkerthedaviddias/Front-End-Checklist · MIT Download the skill Quick start
- 1Download the ZIP. Get the skill ZIP from the skill page on the directory.
- 2Unzip into a skills folder. Unzip it into ~/.claude/skills/ for personal use or .claude/skills/ inside a project.
- 3Or upload in the Claude apps. Open Settings, then Capabilities, then Skills, and upload the skill.
- 4Ask in plain language. Mention image buttons, alt text, or input type image when you share your markup.
- 5Review the result. Check that each image button has alt text naming its action, not the file name or picture.
- 6Verify with assistive tech. Confirm the fix with browser accessibility tools or a screen reader.
What does the skill make the agent do?
When the skill is active, the agent reviews web page markup for input elements of type image. For each one it checks that the alt attribute is present and not empty, and that the text describes what the button does, such as Search or Submit, rather than the picture's file name.
The skill also suggests how to verify the fix with accessibility tools or a screen reader. The underlying rule explains that without alt text, screen readers may read the file name of the image, leaving users unable to tell what the button does.
How do you install the skill?
Download the ZIP for this skill from the page, then unzip it into one of these locations: ~/.claude/skills/ for your personal skills, or .claude/skills/ inside a project to share it with that project.
You can also upload the skill in the Claude apps. Go to Settings, then Capabilities, then Skills, and add it there.
- Personal: unzip into ~/.claude/skills/
- Per project: unzip into .claude/skills/ in the project folder
- Claude apps: Settings → Capabilities → Skills, then upload
How do you trigger the skill with natural requests?
You do not need a special command. The skill's description tells the agent when to use it: reviewing rendered HTML, interactive components, or design-system patterns related to alt text for image buttons. Ask in plain language that mentions image buttons, alt text, or the markup you want reviewed.
- Check the image buttons in this search form for alt text.
- Review this registration page's markup for input type image elements missing alt.
- Does my submit image button have an accessible name?
What does a good result look like?
The rule compares a correct and an incorrect version of the same element. A button with no alt text, or with alt text that only names the picture, is flagged. A button whose alt text names the action is accepted.
- Correct: alt="Search" on a search icon button
- Correct: alt="Submit Registration" on a submit image
- Incorrect: no alt attribute at all
- Incorrect: alt="Magnifying glass", which describes the icon instead of the action
<input type="image" src="search-icon.png" alt="Search">
<input type="image" src="magnifying-glass.png" alt="Magnifying glass">What does the skill need, and what does it run?
The skill lists no requirements. It does not run scripts and does not use the network. It is a short checklist-style instruction set drawn from the Front-End Checklist project and contains no executable code.
Because it only reads and reasons about markup, it cannot test your page in a browser or with assistive technology. Use the browser accessibility tooling and screen reader checks the skill suggests to confirm the result.
- Requires: nothing listed
- Runs scripts: no
- Uses network: no
What are the limits and tips?
This skill covers one rule only. It is not a full accessibility audit and cannot replace testing with real assistive technology. It also does not apply to photos or illustrations that are not buttons, because those fall under a different alt text guideline.
For best results, give the agent the rendered HTML or the component code, and name the form or page you care about. Then verify each fix by reading the button with a screen reader.
- Pass the rendered markup, not only a screenshot
- Ask for focus and keyboard checks alongside alt text when relevant
- Re-test with a screen reader after every change
What people use it for
- Auditing a site search bar that uses an image button for submitting queries
- Reviewing a registration form before release for image submit buttons with missing alt text
- Teaching junior developers why alt text on image buttons describes the action
- Checking a design-system form component for accessible names on image inputs
Frequently asked questions
Is the Image Button Alt Text Checker skill free?
The skill is published under the MIT licence, as listed on its page. Check the repository licence file for the full terms before reuse.
What do I need to install this agent skill?
The skill lists no requirements. You unzip it into ~/.claude/skills/ or a project's .claude/skills/ folder, or upload it in the Claude apps under Settings, then Capabilities, then Skills.
Does the skill run scripts or use the internet?
No. The skill runs no scripts and uses no network. It is a checklist-style set of instructions with no executable code.
Does this skill check all accessibility issues?
No. It covers only the rule that input type image elements need a descriptive alt attribute. It cannot replace a full audit or testing with real assistive technology.
What alt text should an image button use?
Describe the action the button performs, such as Search or Submit, not the picture. Alt text like Magnifying glass describes the icon and does not tell users what happens when they click.
Are alt text rules different for photos on a page?
Yes. This skill targets image buttons only. Images that are not buttons, such as photos or illustrations, fall under a different alt text guideline.
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Our verdict
This skill suits front-end developers, designers and QA reviewers who want a focused check on image button alt text in forms and search bars. It is a poor fit for a complete accessibility audit or for judging photos and illustrations, so pair it with real screen reader testing and a broader audit tool.
Download the skill