Guide · Agent skill
How to use the Image Compression Review agent skill
Updated · written with AI from the project's own documentation and checked against our catalogue data
The Image Compression Review skill is an agent skill: a folder of instructions that an AI coding agent such as Claude loads when a task matches its description. Once it is installed, the agent reviews your image files, the markup that displays them, and your build or CDN image settings for images that are larger than they need to be. This guide explains what the skill does, how to install it, how to trigger it, and where its limits are.
Image Compression Reviewthedaviddias/Front-End-Checklist · MIT Download the skill Quick start
- 1Download the ZIP. Download the image-compression skill ZIP from this page.
- 2Unzip into a skills folder. Unzip it into ~/.claude/skills/ for personal use, or into .claude/skills/ inside a project.
- 3Or upload in the Claude apps. In the Claude apps, go to Settings → Capabilities → Skills and upload the skill.
- 4Ask for a review in plain language. Describe the page or component and ask the agent to review image compression, format and loading.
- 5Check the findings. Read each flagged file or component and decide which changes to make.
- 6Confirm in DevTools. Use browser DevTools to compare encoded and rendered image sizes before and after the fix.
What does the skill make the agent do?
The skill turns the agent into a checklist-style reviewer for image handling. It looks at whether images are compressed without significant quality loss, and it checks encoded size, rendered size, loading strategy and above-the-fold impact together.
It flags format choices: lossy compression for photos and lossless for graphics. It suggests JPEG quality settings around 70-85%, and it recommends automating compression in your build process. It also explains how to confirm the result in browser DevTools.
- Flags files or components where format choice, sizing or loading behaviour is wrong
- Recommends JPEG quality of about 70-85%, and 80-90% for product images per the rule's quality guidelines
- Suggests automating compression in the build
- Describes how to confirm the fix in DevTools
How do you install the Image Compression skill?
Download the ZIP for the skill from this page and unzip it. The folder contains SKILL.md and references/rule.md. You can install it in one of two places.
For a personal setup available across your projects, unzip it into ~/.claude/skills/. To limit it to a single project, unzip it into the .claude/skills/ folder inside that project.
Alternatively, you can upload the skill in the Claude apps under Settings → Capabilities → Skills.
- Personal: ~/.claude/skills/
- Single project: .claude/skills/ inside the project folder
- Claude apps: Settings → Capabilities → Skills, then upload
How do you trigger the skill with a natural request?
You do not need a special command. The agent decides to use a skill when your request matches the skill's description, which concerns reviewing image assets, markup and CDN or build transforms for compression. Describe the job in plain language and point the agent at the relevant files.
Naming the outcome you want helps, for example page weight, load speed or a pre-launch check.
- "Review the images on my landing page for compression and page weight."
- "Check whether my hero image is sized and loaded correctly above the fold."
- "Audit how our build handles image compression before we launch."
What examples can you try?
Good first tasks are small and specific. Point the agent at one page or one component, then ask it to flag problems with file format, dimensions or loading attributes.
The rule's reference material gives example commands for compressing images with ImageMagick, Sharp CLI, pngquant and svgo. The skill itself does not run these; it can point you to them when recommending a fix.
- Ask which photos should be JPEG or WebP versus PNG graphics.
- Ask whether a hero image is larger than its rendered size.
- Ask the agent to suggest a build step that compresses images automatically.
convert input.jpg -quality 80 output.jpgWhat does the skill need, and is it safe to use?
The skill lists no required tools. It does not run scripts and does not use the network, so it only reads and reasons about the files you give it. It is not a tool that performs compression.
Because it does not run code, the main safety consideration is the normal one for any agent: review the changes it proposes before applying them to your project.
- Requires: nothing listed
- Runs scripts: no
- Uses network: no
- Licence: MIT
What are the best tips for getting useful results?
Give the agent the markup and the build or CDN configuration along with the image files, because the skill checks them together. Expect the skill to be most useful for JPEG quality and format decisions.
Treat the savings figures as rough guidance. The skill's 60-80% claims assume minimal visible loss and may not hold for every image, so check the results visually and in DevTools.
- Include the HTML or component that displays each image.
- Share your build config or CDN image settings if you use them.
- Compare encoded size with rendered size in DevTools before and after changes.
What people use it for
- Reviewing a landing page for oversized hero images before launch
- Checking whether photos should be JPEG or WebP and graphics PNG or SVG
- Auditing a build or CDN setup for automatic image compression
- Running a checklist-style review of image handling with a team before release
Frequently asked questions
How do I install the image-compression skill?
Download the ZIP from this page and unzip it into ~/.claude/skills/ for personal use, or into .claude/skills/ inside a project. You can also upload it in the Claude apps under Settings → Capabilities → Skills.
Does the image compression skill require anything else?
The skill lists no required tools. It does not run scripts and does not use the network, so it reviews the files you provide rather than compressing them.
Is the Image Compression Review skill free?
The skill is published under the MIT licence. The source does not mention pricing, so check the licence terms in the repository for details.
Can the skill compress my images for me?
No. It gives guidance and review, not a tool that runs compression, so it should not be relied on for batch conversion. For compression itself, the rule references tools such as ImageMagick, Sharp CLI, pngquant and svgo, and the page mentions ImageOptim and TinyPNG.
Is the 60-80% size saving guaranteed?
No. The skill's savings claims assume minimal visible loss and may not hold for every image. Projects where exact pixel fidelity matters, such as archival or print masters, are not a good fit.
How do I confirm the compression worked?
The skill explains how to confirm the result in browser DevTools. Compare encoded size and rendered size before and after your changes.
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Our verdict
Use this skill if you are a front-end developer auditing page weight and load speed, or a team that wants a checklist-style review of image handling before launch. Pick a dedicated compression tool or a build plugin instead if you need files actually compressed in bulk, or if exact pixel fidelity matters for archival or print work.
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