Windsurf

Windsurf is an AI-native integrated development environment built by Codeium. It embeds the Cascade AI agent directly into the editor, enabling multi-file editing, terminal command execution, and persistent context awareness through its Flow architecture. Unlike traditional IDEs with bolted-on AI assistants, Windsurf was designed from the ground up around AI-assisted development.

The mental model

Windsurf treats the AI as a collaborator that works alongside you in your editor. Cascade, the core AI system, maintains a stateful understanding of your session: the files you have open, the edits you have made, the terminal output you have seen, and the decisions you have discussed.

your intent
  -> Cascade reads open files, git state, and context
  -> proposes multi-file edits and commands
  -> you review and approve
  -> Cascade applies changes
  -> context persists across the session

This is not a chat sidebar that forgets after each message. Cascade tracks state, remembers earlier decisions, and can chain operations across multiple turns without re-explaining the context.

Cascade modes

Cascade operates in two primary modes that determine how it interacts with your codebase:

Mode	Purpose
Chat	Ask questions about your codebase or general programming topics. Cascade may propose code snippets that you can accept and insert.
Code	Cascade reads files, proposes edits, runs terminal commands, and makes multi-file changes. This is the agentic mode for implementing features and fixing bugs.

Switch between modes using the Cascade panel. In Chat mode, Cascade analyzes but does not modify. In Code mode, Cascade acts as an agent that plans, executes, and iterates.

Flow context system

Windsurf's Flow architecture maintains context across your entire session. The context engine tracks:

• Open files: The files currently visible in your editor
• Recent edits: Changes you have made during the session
• Terminal output: Commands you have run and their results
• Git state: Current branch, staged changes, and recent commits
• Clipboard contents: Text you have copied within the IDE
• Browser context: URLs and content from integrated browser sessions

This context feeds into every Cascade prompt automatically. You do not need to re-explain what you are working on each time. The AI knows what files are open and what changes are in progress.