Handle

What is Handle?

Handle is a browser-based UI refinement tool that lets you make interface edits directly in Chrome and then send those changes to your coding agent. Its core purpose is to bridge UI tweaks you can see with code updates your agent applies to your project.

From the page flow shown on handle.ai, you refine a UI in the browser (via Handle’s extension), then your coding agent incorporates the resulting updates into source files for review.

Key Features

• Refine UI directly in the browser (Chrome): Use Handle’s extension to make changes while viewing the running app, so adjustments are grounded in what you see.
• Feed browser edits to a coding agent: After you refine the UI, Handle provides the changes back to your agent for code generation or updates.
• Works with multiple coding agents/models: The page lists compatibility with Claude Code, Cursor, GitHub Copilot, Windsurf, Gemini, and Rovo.
• Project updates land in source files: The example workflow shows agent-driven changes being applied to files under a typical app structure (e.g., src/components/...).

How to Use Handle

1. Initialize the extension/tooling: Run npx handle-ext@latest init.
2. Create or connect your coding workflow: The page example shows starting with a command like /handle after creating a UI editing session with your coding agent.
3. Edit the UI in the browser: Open your local app (example shown as localhost:3000) and refine components using Handle while viewing them in Chrome.
4. Review agent-updated files: After modifications (example: three components), the coding agent applies updates to the corresponding source files for review.

Use Cases

• Adjust page components while viewing the live app: When a hero section, pricing card layout, or footer styling needs tuning, you can refine the UI in-browser and have the agent update the relevant React component files.
• Incorporate feedback into code through iterative edits: If you receive feedback on multiple UI components, you can refine each component and route the changes into the codebase rather than rewriting manually.
• Speed up UI-to-code handoff for agent-driven development: When using an agent to implement features, Handle helps connect “what the UI should look like” with resulting code updates.
• Work across common agent setups: If your team already uses an agent such as Cursor or GitHub Copilot, Handle can fit into that workflow by sending the browser-refined changes to your existing agent.

FAQ

• What does Handle modify—UI in the browser or code? Handle is used to refine UI directly in the browser, and then it feeds those changes to your coding agent so code updates are applied to your project files.

• Which browsers does Handle support? The page explicitly mentions refining inside Chrome.

• Do I need a specific coding agent? The site lists multiple supported options, including Claude Code, Cursor, GitHub Copilot, Windsurf, Gemini, and Rovo.

• Where do the changes go after editing? The example shown indicates that agent updates result in file changes (e.g., updates to src/components/Hero.tsx, PricingCards.tsx, and Footer.tsx) that are ready for review.

• How do I set it up locally? The page provides a command to run: npx handle-ext@latest init.

Alternatives

• Design directly in code (component/stylesheet editing): Instead of refining via a browser extension and feeding edits to an agent, you manually edit the relevant UI source files (more direct, but less assisted by an agent).
• UI prototyping tools with export to code: Tools that help you iterate on layout visually may offer export or translation into code, but they don’t necessarily send “live UI refinements” back to a coding agent in the same workflow.
• Agent-only UI generation: Some coding agent workflows focus on generating UI code from text prompts without a browser-based refinement step; this differs by requiring more prompt/iteration rather than in-browser UI edits.