How to Use Windsurf AI Code Editor: What They Don’t Tell You

You’re staring at a React component that needs authentication, a database migration, and three new API routes. Normally you’d context-switch between files, remember what changed where, and pray you didn’t break something two folders deep.

Windsurf handles that differently. Cascade – the AI agent – sees your entire project. What you just edited, what’s in your terminal, what’s on your clipboard. Makes coordinated changes across multiple files. You don’t re-explain context every time.

What Windsurf Actually Does (The Part That Matters)

Not a chatbot you paste code into. It’s a VS Code fork with AI wired into the core, built by Codeium (now owned by Cognition AI, the team behind Devin).

The differentiator? Cascade remembers.

You tell Cascade “add authentication to this Express app.” It already knows your route structure, middleware stack, database models. Doesn’t ask you to explain. Updates the files that need updating, runs the migrations, shows you diffs to approve or reject.

Two features do this: Memories and flow tracking. Memories store your project-specific patterns (“always use named exports,” “authentication goes through this middleware”). Flow tracking watches edits, terminal commands, clipboard – Cascade doesn’t need you to re-explain context mid-session.

The catch: this only works if you configure it correctly. Most tutorials skip that part.

Download and First-Launch Setup (The 5-Minute Version)

Head to windsurf.com and grab the installer. Mac, Windows, Linux. Installation: under 2 minutes.

First launch asks if you want to import from VS Code or Cursor. Say yes. Pulls settings, extensions, themes, keybindings – everything except AI-specific configs.

Authentication next. Free account or sign in. Auth flow opens a browser, generates a code you paste back. If that fails (it sometimes does), log in on the website manually, grab the code from account settings.

Now you’re in. The interface? Looks like VS Code because it is VS Code under the hood.

Pro tip: During setup, set your default terminal profile explicitly (Settings → search “terminal default profile”). Skip this? Cascade might think terminal commands are still running even after they finish. Especially common if you use Oh My Zsh or Powerlevel10k themes.

Open Cascade and Ask It to Build Something

Press Cmd+L (Mac) or Ctrl+L (Windows/Linux). Cascade opens. Two modes at the top: Code and Chat.

• Code mode: Multi-file edits autonomously. Instructions → code generation → command execution → diffs to accept/reject.
• Chat mode: Answers questions about your codebase or general coding principles. Doesn’t auto-edit files unless you accept a suggestion.

Start in Code mode. Type: “Create a Next.js project with a home page, an about page, and routing between them.”

Cascade will scaffold the project, install dependencies via npm (terminal output visible), create page components, set up routing, show you a preview. Each step: a diff. Accept all, reject all, or review line-by-line.

Here’s where it gets weird: Cascade tracks your actions in real-time. Creates a file, you manually edit something? Just say “continue.” It picks up from where you left off. No re-explaining.

The Memories System (And Why You’ll Burn Credits Without It)

Windsurf automatically creates Memories – snippets of context it stores about your project. You correct Cascade’s output, say “always use async/await, not .then()”? Windsurf saves that as a Memory.

Automatic Memories don’t catch everything. You should also create Rules.

Cascade panel → three-dot menu → Memories/Rules. New rule file (Markdown). Example:

# Coding Rules
- Use TypeScript strict mode
- All API routes go in /pages/api
- Never use default exports
- Database queries use Prisma

Save as .windsurfrules at project root. Cascade reads it every session.

Why does this matter? No rules → generic conventions. With rules → your team’s patterns. Fewer corrections, fewer wasted prompts, fewer credits burned on re-generation.

One edge case: as of March 2025, some users reported .windsurfrules files stopped working in the stable release. Cascade acted like the file didn’t exist. Bug was fixed in Windsurf Next (prerelease version). If your rules aren’t applying, check which version you’re on.

Inline Edits and Terminal Commands

You don’t always need Cascade’s full multi-file mode. Sometimes: a quick change.

Select some code. Press Cmd+K (Mac) or Ctrl+K (Windows/Linux). Prompt box appears. Type: “Refactor this to use async/await” or “Add error handling.” Windsurf generates the change inline. Accept or reject.

Same deal in the terminal. Open a terminal pane, press Cmd+I or Ctrl+I, describe what you want: “Install Tailwind CSS and configure it for Next.js.” Cascade writes commands, runs them, monitors output. Something fails? Debugs and retries.

Turbo Mode (Settings → Cascade → Turbo Mode): Cascade auto-executes terminal commands without asking. Rapid iteration. Also risky if you’re not reviewing what it’s doing.

The Credit System (And Why 500 Vanishes Fast)

Windsurf uses credits. Free tier: 25 prompt credits/month (as of March 2026). Pro: $15-20/month, 500 credits.

Credit cost? Depends on AI model:

Claude Opus for everything? 500 credits = ~20 prompts. Not a lot.

The trick: cheap models for boilerplate, expensive models for hard problems. Cascade lets you switch models mid-conversation (dropdown below the input box).

March 2026: Windsurf changed from credit pools to quota systems (daily/weekly refresh limits). You can’t burn your entire monthly allocation on one sprint day anymore. Old tutorials don’t mention this – the change was recent. Official docs still showed old pricing as of March 23.

What Happens When You Hit Zero

Cascade stops working. Autocomplete (Tab) still functions – separate pipeline – but you can’t ask questions or generate code. Buy more credits or wait for next billing cycle.

One edge case: some free-tier users saw zero credits from day one (despite advertised 25 prompts). Support was reportedly unresponsive unless the user agreed to upgrade. Documented on DEV Community and Product Hunt, mid-2025. Not sure if fixed.

Context Management (Or: Why Cascade Forgets Everything After 20 Files)

Cascade tracks context automatically. Context windows have limits. As of late January 2026, Windsurf added a visual indicator showing how full your context window is.

Context gets too long? Earlier messages get dropped. Hallucinations start: non-existent imports, deleted working code, forgotten project structure.

Fix: start a new conversation when the indicator turns yellow. Or use @codebase mentions to pull specific files into context without dragging in the whole history.

Another trick: Checkpoints feature (three-dot menu in Cascade). Checkpoints save conversation state. Resume later without re-explaining everything.

Ever had Cascade generate an import that doesn’t exist? That’s the context window hitting its limit. One debugging session burned through 100 messages. By message 80, Cascade thought we were working on a different project entirely.

Comparing Windsurf to Cursor (The Honest Version)

Everyone asks this. What actually matters:

Cursor is faster. Individual completions and small edits return near-instantly. Windsurf is slower – analyzes more context before responding.

Windsurf: better at multi-file refactors. Cursor’s Composer mode is good. Windsurf’s Cascade has deeper codebase awareness. For large projects (10+ files)? Windsurf makes fewer mistakes.

Cursor has better docs and more stable uptime. Windsurf’s community reports more bugs – terminal hangs, credit system glitches, rules files not loading. Some of this: growing pains (the product is newer). Some: structural.

Windsurf is cheaper. $15-20/month vs. Cursor’s $20/month. But Windsurf’s credit system means heavy users blow through the allocation fast.

Code in short bursts, want speed? Cursor wins. Work on multi-file features, want the AI to remember your patterns across sessions? Windsurf wins.

Three Things Tutorials Don’t Mention

Terminal sessions can hang even when commands finish. Happens if you use custom zsh themes (Oh My Zsh, Powerlevel10k). Cascade thinks the command is still running – theme emits extra escape sequences. Fix: disable the theme or set a simple default profile in settings. Official troubleshooting docs confirm this.

Cascade auto-fixes its own errors, but that burns extra credits. Tight budget? Switch to Chat mode for debugging instead of letting Code mode iterate autonomously.

Memories are workspace-scoped. Multiple projects? Each gets its own Memory store. Good for isolation. Bad if you want global rules. Enterprise users can set global rules in ~/.codeium/. Solo devs? Can’t.

FAQ

Can Windsurf replace GitHub Copilot?

Different use cases. Copilot: better for inline suggestions while you type. Windsurf: better for “build this entire feature” tasks.

Does Windsurf train on my code?

By default, no. Privacy-first policy with optional zero-day retention. But you can opt out of code snippet telemetry in account settings. I did – took about 30 seconds. Settings → Privacy → uncheck “Share code snippets for product improvement.” The toggle is buried but it’s there.

What happens if I run out of credits mid-project?

Cascade stops working. Autocomplete still functions. You can buy add-on credits ($10 per 250 on Pro) or switch to the free SWE-1 Lite model (slower but unlimited). Or bring your own API key (BYOK) for Anthropic/OpenAI if you’re on the Free plan. Watch out: BYOK bills you directly at API rates, which can exceed Windsurf’s bundled pricing if you’re not careful. One user reported $80 in OpenAI charges over a weekend sprint because they forgot to switch back to the bundled model.

Install Windsurf. Create a project. Open Cascade with Cmd+L. Tell it to build something real – not a to-do app, something you’d actually use. Watch how it handles multi-file changes. Then set up your .windsurfrules file and try again. You’ll see the difference immediately.