Windsurf IDE: Complete Guide (2026)

#windsurf #aitools #vscode #productivity

Windsurf is an AI-first code editor built by Codeium. Where Codeium was an extension for existing editors, Windsurf is a standalone editor built on VS Code with AI at the center of every feature. Its main differentiator: the free tier is genuinely usable, unlike Cursor's 50 agent requests/month limit.

Core Features

Supercomplete (Tab Completion)

Multi-line tab completion that understands your edit pattern — rename a variable in one location and it suggests the same rename in related locations. Press Tab to accept, Escape to reject.

Cascade — The Agent

Describe a task, Cascade plans it, edits files, runs terminal commands, reads output, iterates:

Add a webhook endpoint for Stripe payment events.

Requirements:
- POST /api/webhooks/stripe
- Verify the Stripe-Signature header
- Handle: payment_intent.succeeded, customer.subscription.deleted
- Update user subscription status in the database
- Use the existing db singleton from lib/db.ts

Cascade shows its plan before starting — always review it before approving. Flows is Windsurf's term for the visible sequence of steps: which files it read, what commands it ran, what edits it made.

Memories

Windsurf persists information across sessions automatically. When Cascade learns something about your project, it saves it as a Memory. You can also add manually:

Remember: This project uses the repository pattern. All database
access goes through classes in src/repositories/, never directly
in route handlers.

Similar to Claude Code's CLAUDE.md but managed by the editor, not a file you write. Key difference: CLAUDE.md is in git (whole team sees it), Memories are local to your installation.

Windsurf Rules

.windsurfrules — project-specific instructions for every AI interaction:

# .windsurfrules

## Stack
- Next.js 15 App Router + TypeScript strict
- Prisma + PostgreSQL + Tailwind CSS + Shadcn UI

## Conventions
- Server Components by default — 'use client' only when needed
- All DB access via db singleton in lib/db.ts
- API routes: { data } on success, { error: string } on failure
- Zod validation on all user inputs

## Do not
- console.log in production code
- Import from @prisma/client in client components
- Use any or type assertions

Models

Model	Best for
Claude Sonnet 4.5	Complex agent tasks, multi-file
Claude Opus 4	Hard architectural problems
GPT-4o	Fast chat, quick questions
Gemini 2.5 Pro	Large codebases (1M context)

Windsurf vs Cursor

	Windsurf	Cursor
Free tier	Generous — usable daily	50 agent requests/month
Tab completion	Supercomplete — multi-line	Multi-line, slightly more aggressive
Agent	Cascade with Flows	Agent mode
Memory	Automatic (Memories)	Manual (Project Rules)
Docs integration	@web (live search)	@docs (indexed libraries)
Price (Pro)	$15/mo	$20/mo

Start with Windsurf if you want to evaluate without paying. Switch to Cursor if you need indexed @Docs for frequently referenced libraries.

Windsurf vs GitHub Copilot

	Windsurf	GitHub Copilot
GitHub integration	Via git CLI	Native (PRs, CodeQL, issues)
Free tier	Yes (generous)	No
Price	$0–$15/mo	$10–$39/mo

Copilot wins on GitHub integration — PR review, Dependabot autofix. Windsurf wins on price and free tier.

Effective Cascade Prompts

Explicit constraints:

Refactor auth middleware to use JWT instead of session cookies.
Only change files in middleware/ and lib/auth/.
Keep the same function signatures. Do not touch test files.

Reference existing patterns:

Add a DeletePostModal following the exact same pattern as
ArchivePostModal in components/modals/ArchivePostModal.tsx.

Acceptance criteria:

Add pagination to the post listing.
Done when:
- GET /api/posts accepts ?page=1&pageSize=10
- Response: { posts, total, hasNextPage }
- Frontend uses these params