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Guide · Agent skill

How to use the CDN Performance Auditor agent skill

Updated · written with AI from the project's own documentation and checked against our catalogue data

The cdn skill is a set of instructions that teaches an AI agent to review how a website delivers its static files, such as images, scripts and styles, through a content delivery network (CDN). A CDN keeps copies of those files on servers close to visitors so pages load faster for people far from your server. This guide explains what the skill does, how to install it, how to ask for it in plain language, and where its limits are.

CDN Performance Auditorthedaviddias/Front-End-Checklist · MIT

Quick start

  1. 1Download the ZIP. Download the cdn skill ZIP from this page.
  2. 2Unzip the folder. Unzip it so you have a folder containing SKILL.md and references/rule.md.
  3. 3Choose a location. Place the folder in ~/.claude/skills/ for personal use or in .claude/skills/ inside a project.
  4. 4Or upload it in the apps. In the Claude apps, go to Settings → Capabilities → Skills and upload the skill.
  5. 5Describe the problem. Ask about slow pages, heavy assets or rendering delays in plain words.
  6. 6Provide measurements. Share DevTools, Lighthouse or field data so the agent can verify the bottleneck.
  7. 7Review the output. Check the files, requests and caching headers the agent names before making changes.

What is an agent skill and what does the cdn skill make the agent do?

An agent skill is a folder with a SKILL.md file that gives an AI agent specific instructions for a task. When a request matches the skill's description, the agent follows those instructions.

The cdn skill is aimed at slow page loads, heavy assets and rendering delays related to using a content delivery network. Its guidance asks the agent to check whether static assets are served from a CDN and whether the CDN is configured properly, then to configure it with proper caching headers and geographic distribution if needed.

  • Check: confirm whether static assets come from a CDN and whether it is properly configured.
  • Fix: set up a CDN to serve static assets with proper caching headers and geographic distribution.
  • Explain: describe how CDNs reduce latency by serving content from geographically distributed servers.
  • Code review: flag exact files, requests or rendering steps that add unnecessary network, CPU or layout cost, and describe how the issue was measured.

How do you install the cdn skill?

Download the ZIP file for the skill from this page and unzip it. The skill folder contains SKILL.md and a references/rule.md file. Place the unzipped folder in one of these locations:

  • Personal skills: ~/.claude/skills/ (available across your projects).
  • Project skills: .claude/skills/ inside your project folder (available only to that project).
  • Claude apps: upload the skill under Settings → Capabilities → Skills.

How do you trigger the skill with a natural request?

You do not need a special command. Describe the problem in ordinary words and mention pages, assets or load speed. The skill's description covers auditing slow page loads, heavy assets and rendering delays, so requests like these are a good match.

The skill's own guidance asks the agent to verify the real bottleneck before recommending changes, so it helps to say what you have measured, if anything.

  • "My product page takes eight seconds to load for users in Australia. Is a CDN the problem?"
  • "Audit how our static images and scripts are delivered and tell me whether they use a CDN."
  • "Review our caching headers for CSS and JS files before our launch."
  • "Our Lighthouse report flags heavy assets. What is the actual bottleneck?"

What should you expect the agent to do?

The skill asks the agent to check before recommending anything. It points to DevTools, Lighthouse and field data as ways to confirm the bottleneck. A good response should name the files or requests involved, describe how the issue was measured, and only then suggest a CDN setup with caching headers.

The skill's example configuration sets a Cache-Control header for files under /static/ in a Next.js config. This is an example from the source, not a rule that applies to every site.

Cache-Control: public, max-age=31536000, immutable

What does the cdn skill need, and what are the safety notes?

The skill lists no requirements. It does not run scripts and does not use the network, according to its listing. It is a set of written instructions for the agent.

Be aware of two limits. The source mentions DDoS protection only in passing, so do not rely on this skill for security decisions. The skill also cites a 50-70% latency reduction, which is a generic claim and not verified for your site. Measure your own pages before expecting that result.

  • No listed requirements.
  • Runs scripts: no. Uses network: no.
  • Do not use it as a security review.
  • Treat any latency figure as a general claim, not a measurement of your site.

Tips for getting useful results

The skill is a good fit for a checklist-style CDN review before launch or when a site serves users far from its server. It is less useful for sites with no static assets or no global audience, where a CDN gains little.

  • Give the agent real data: DevTools timings, a Lighthouse report or field data.
  • Ask for the files and requests involved, not only a general opinion.
  • Check that the CDN is actually serving your static files, not only that one exists.
  • Review cache headers alongside the CDN setup.

What people use it for

  • Checking whether a site's images and scripts are served through a CDN before a launch.
  • Reviewing Cache-Control headers for static files in a Next.js project.
  • Investigating slow page loads for visitors far from your server.
  • Producing a checklist-style performance review for a team.

Frequently asked questions

Is the cdn skill free to use?

The skill is published under the MIT licence, according to its listing. Check the licence file in the source repository for the full terms.

What do I need to run the cdn skill?

The listing shows no requirements. It does not run scripts and does not use the network, so it works as written instructions for the agent.

Where do I put the cdn skill folder?

Use ~/.claude/skills/ for personal skills, or .claude/skills/ inside a project. You can also upload it under Settings → Capabilities → Skills in the Claude apps.

Does the cdn skill set up a CDN for me?

The skill guides the agent to check CDN use and recommend configuration, including caching headers and geographic distribution. It does not itself deploy anything, since it runs no scripts.

Which CDNs does the skill mention?

The source lists Cloudflare, Vercel, AWS CloudFront and Fastly as popular options.

Can the cdn skill replace a security audit?

No. DDoS protection is mentioned only in passing, so do not rely on this skill for security decisions.

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Our verdict

Use the cdn skill if you are a web developer investigating slow pages for distant users, or preparing a checklist-style CDN review before launch. Pick something else if your site has few static assets, no global audience, or if you need a security assessment.

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