frontend-review-mcp

An MCP server that performs a visual review of a UI edit request. Ask your agent to screenshot the page before and after the edit, and then call this tool to review the edit.

Usage

Cursor

To install in a project, add the MCP server to your .cursor/mcp.json:

{
	"mcpServers": {
		"frontend-review": {
			"command": "npx",
			"args": ["frontend-review-mcp HYPERBOLIC_API_KEY=<YOUR_API_KEY>"],

		}
	}
}

To install globally, add this command to your Cursor settings:

npx frontend-review-mcp HYPERBOLIC_API_KEY=<your-hyperbolic-api-key>

Windsurf

Add the MCP server to your ~/.codeium/windsurf/mcp_config.json file:

{
	"mcpServers": {
		"frontend-review": {
			"command": "npx",
			"args": ["frontend-review-mcp HYPERBOLIC_API_KEY=<YOUR_API_KEY>"]
		}
	}
}

Tools

Currently, the only tool is reviewEdit.

Your Agent will call this tool with the following arguments:

beforeScreenshotPath: The absolute path to the screenshot of the page before the edit.
afterScreenshotPath: The absolute path to the screenshot of the page after the edit.
editRequest: A detailed description of the UI edit request made by the user.

The tool will return a response with either a yes or no response, indicating whether the edit visually satisfies the edit request. If no, it will provide a detailed explanation of why the edit does not satisfy the request so you can continue to work on it.

Review Model

Currently, the review model is Qwen/Qwen2-VL-72B-Instruct from Hyperbolic. It will automatically retry the request with these models if it fails:

Fallback order:

Qwen/Qwen2-VL-72B-Instruct
Qwen/Qwen2-VL-7B-Instruct
meta-llama/Llama-3.2-90B-Vision-Instruct
mistralai/Pixtral-12B-2409

If you want to use a different model as the first model, you can add the MODEL arg to the command:

npx frontend-review-mcp HYPERBOLIC_API_KEY=<your-hyperbolic-api-key> MODEL=<your-model>

It will try the specified model first, and then try the others if it fails.

Taking Screenshots

You can use any MCP server to take screenshots. I've been using https://github.com/AgentDeskAI/browser-tools-mcp which has a takeScreenshot tool, among other useful tools for frontend development.

AI Instructions

You can include the following instructions in your AI's prompt to make it take screenshots and review the edit:

When making frontend edits:

- Before making any changes, call the mcp_takeScreenshot function to save the current state of the page.
- After making your change, call the mcp_takeScreenshot function again to save the new state of the page.
- Screenshots will be saved to /screenshots folder.
- Run this command to get the absolute paths of the 2 most recent screenshots in the /screenshots folder:



find screenshots -type f -name "*.png" -exec stat -f "%m %N" {} \; | sort -nr | head -n 2 | awk '{print $2}' | xargs realpath | awk 'NR==1 {print "before path: ", $0} NR==2 {print "after path: ", $0}'


- Call the mcp_reviewEdit function to have your changes visually reviewed.
- Use the following format for the tool call:

{
  "beforeScreenshotPath": string, // Absolute path to the second-most recent screenshot
  "afterScreenshotPath": string, // Absolute path to the most recent screenshot
  "editRequest": string // Describe the edit request from the user in a couple of sentences
}

- You should summarize my edit request into a couple of sentences so that the frontend reviewer understands the changes you made.

- The tool will either return "yes" if your changes are good, or "no" with a brief explanation if the changes don't satisfy the edit request. Keep editing with the same process until the reviewer returns "yes".

Tips

Make sure YOLO mode is on and MCP tools protection is off in your Cursor settings for the best experience.

frontend-review-mcp