The Cursor + Claude Combo That Outperforms Using Either Tool Alone
Cursor AI — Module 3: Composer, Cursor Rules & Working Like a Pro
This is where Cursor stops being a tool you use and becomes a system you trust. Composer for multi-file changes, Cursor Rules for permanent standards, and the Cursor + Claude combo that most users never discover. Finish this module with a polished, deployed website and the habits that make every future project faster.
Modules 1 and 2 covered installation, prompting, multi-page builds, and deployment. Module 3 is about depth — the features that turn Cursor from "an editor with AI" into the fastest way you'll ever build something. Composer, Rules, debugging at scale, and the model-switching trick that gets you the best of both Claude and GPT.
Composer — The Most Powerful Feature You're Not Using
Chat is great for single tasks. Composer is for big changes across multiple files at once. Open it with Cmd+Shift+I (Mac) or Ctrl+Shift+I (Windows).
Composer reads, edits, and creates multiple files in one shot. This is where Cursor goes from useful to genuinely powerful.
Redesign Across Every File at Once
I want to redesign my blog to use a dark theme. Update all three files (index.html, about.html, post.html) and style.css to: - Switch to a dark background (#0F172A) - Use light text (#E2E8F0) - Keep the green accent color - Update navigation to match the new dark background - Make sure all cards and sections look good on dark Do not change page structure or remove content — just update the visual styling.
Use Composer for Refactoring
Composer excels at repetitive structural changes across a whole codebase:
Extract all repeated navigation HTML into one shared pattern and apply it consistently across index.html, about.html, and post.html. Rename every instance of "My Blog" to "Kodexon" in every file.
Cursor Rules — Train It on Your Standards Once
Cursor Rules let you set permanent instructions for how Cursor behaves in your project. Instead of repeating your preferences every prompt, write them once and Cursor always follows them.
Create a .cursorrules File
In your project root, create a file called .cursorrules and describe how Cursor should behave:
# Kodexon Blog — Cursor Rules Project: Personal blog built with HTML, CSS, vanilla JS only Rules: - Never use Bootstrap, Tailwind, or any CSS frameworks - Always import styles from style.css — no inline styles - Keep all CSS variables at the top of style.css - Use semantic HTML (header, nav, main, article, footer) - All images use loading="lazy" - Mobile-first: base styles for mobile, min-width media queries for desktop - Comments in English only Naming: - CSS classes: kebab-case - JavaScript variables: camelCase - File names: lowercase with hyphens Design: - Primary color: #10B981 (emerald green) - Background: #F8FAFC - Font: Inter, system-ui, sans-serif
Debugging at a Higher Level
Always Paste the Exact Error
Copy the error from your browser console (F12 → Console) or terminal exactly as it appears. Add one line of context — what you clicked, what you expected. Cursor reads the relevant file, finds the line, and fixes it in the same response.
Cursor + Claude — The Best Combo in 2026
Cursor lets you choose which AI model powers your session. Switching between models for different tasks gets you noticeably better results than sticking with one.
Switch Models in Settings
Cursor Settings → Models → select Claude (Sonnet or Opus). You can also switch per-conversation by clicking the model name in the chat header.
Use Claude for Writing Tasks
Blog post content, page copy, meta descriptions, email templates — Claude writes more natural prose in most cases. Use it for anything where the words matter.
Use GPT-4o for Pure Code Tasks
JavaScript logic, CSS fixes, file manipulation — GPT-4o is fast and reliable for pure code work. Mix models based on the task in front of you.
Cursor + Claude: Write Blog Content
# Switch to Claude in the model selector, then run this
Write a 600-word blog post for my site about "Why I Switched
to Cursor AI for All My Web Projects."
Tone: conversational and honest, like talking to a friend.
Structure: opening hook, what I used before and why it wasn't
working, first time using Cursor and what surprised me, 3
specific things I do faster now, a closing thought that's real.
No corporate tone, no AI buzzwords, no listicle formatting.
Return as HTML paragraphs with H2 headings — ready to paste
into post.html.
The people getting the most out of Cursor aren't the ones who know the most about code. They're the ones who ask the best questions and know which model to ask them to.
Speed Techniques That Actually Save Time
Cmd+K on Selected Code
Select any block → Cmd+K → type your change. The fastest edit cycle in Cursor. No chat panel needed.
@ to Reference Files in Chat
Type @filename in Chat to pull a specific file into the conversation: "@style.css — update the card hover effect to add a green border." More precise than hoping Cursor finds the right file.
Tab Autocomplete
Cursor predicts what comes next as you type and shows a gray suggestion. Press Tab to accept. You'll miss it in every other app once you're used to it.
Terminal Inside Cursor
Ctrl+` opens a terminal right inside Cursor. Run commands without switching windows — you can even ask Cursor to write and run terminal commands directly.
Module 3 Practice — Polish and Launch Your Final Site
Run each of these prompts on the multi-page site from Module 2 to take it from template to something that feels finished and genuinely yours.
Add a Dark Mode Toggle
Add a dark mode toggle button to my navigation bar. Requirements: - A sun/moon icon button in the nav (right side) - Clicking it switches between light and dark theme - Use CSS custom properties for the color switch - Save the preference in localStorage so it persists on reload - Dark mode colors: background #0F172A, text #E2E8F0 - No external libraries — vanilla JS only
Complete SEO Pass
Add complete SEO meta tags to all three pages of my site. For each page include: - Meta description (140-160 characters, unique per page) - Open Graph tags (title, description, image, url, type) - Twitter Card tags - Canonical URL tag Use placeholder content appropriate for each page.
Reading Time and Scroll Progress Bar
Add two features to my post.html: 1. Reading time estimator — calculate approximate read time from article word count and show it in the post meta 2. Scroll progress bar — thin green bar at the top of the page that fills 0% to 100% as the user scrolls Both vanilla JavaScript only. Progress bar uses my primary green color (#10B981).
What Comes Next
- Add a Contact Form Cursor + Netlify Forms = a working contact form with zero backend
- Connect a CMS Ask Cursor to integrate Decap CMS so you write posts without touching code
- Build Something New Portfolio, landing page, product site — apply the same process
- Learn Cursor + Next.js Once comfortable with HTML, level up to a JS framework with Cursor guiding you
Module 3 — What You've Learned
- Composer: Multi-file edits and full redesigns in a single prompt
- Cursor Rules: Permanent project standards set once, followed automatically forever
- Debugging: Pasting exact errors gets fast, accurate fixes every time
- Cursor + Claude: Switch models — Claude for writing, GPT-4o for code logic
- Speed techniques: Cmd+K, @file references, Tab autocomplete, built-in terminal
- Final polish: Dark mode, complete SEO, reading time, and scroll progress — production ready
You've Finished the Cursor AI Masterclass
Three modules. From installing your first editor to a fully polished, deployed, multi-page website built almost entirely through conversation.
More Cursor AI Tutorials →