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WebEvalAgent

An MCP server that autonomously evaluates web applications.

🚀 operative.sh web-eval-agent MCP Server

Let the coding agent debug itself, you've got better things to do.

Demo

🔥 Supercharge Your Debugging

operative.sh's MCP Server launches a browser-use powered agent to autonomously execute and debug web apps directly in your code editor.

⚡ Features

  • 🌐 Navigate your webapp using BrowserUse (2x faster with operative backend)
  • 📊 Capture network traffic - requests are intelligently filtered and returned into the context window
  • 🚨 Collect console errors - captures logs & errors
  • 🤖 Autonomous debugging - the Cursor agent calls the web QA agent mcp server to test if the code it wrote works as epected end-to-end.

🏁 Quick Start (macOS/Linux)

  1. Pre-requisites (typically not needed):
  • brew: /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
  • npm: (brew install npm)
  • jq: brew install jq
  1. Run the installer after getting an api key (free)
# Feel welcome to inspect the installer script like so:
# curl -LSf https://operative.sh/install.sh | less -N
# Download, install, and remove the installer script
curl -LSf https://operative.sh/install.sh -o install.sh && bash install.sh && rm install.sh
  1. Visit your favorite IDE and restart to apply the changes
  2. Send a prompt in chat mode to call the web eval agent tool! e.g.
Test my app on http://localhost:3000. Use web-eval-agent.

🛠️ Manual Installation

  1. Get your API key at operative.sh
  2. Install uv
curl -LsSf https://astral.sh/uv/install.sh | sh)
  1. Install playwright:
npm install -g chromium playwright && uvx --with playwright playwright install --with-deps
  1. Add below JSON to your relevant code editor with api key
  2. Restart your code editor

🔃 Updating

  • uv cache clean
  • refresh MCP server
    "web-eval-agent": {
      "command": "uvx",
      "args": [
        "--refresh-package",
        "webEvalAgent",
        "--from",
        "git+https://github.com/Operative-Sh/web-eval-agent.git",
        "webEvalAgent"
      ],
      "env": {
        "OPERATIVE_API_KEY": "<YOUR_KEY>"
      }
    }

🚨 Issues

  • Updates aren't being received in code editors, update or reinstall for latest version: Run uv cache clean for latest
  • Any issues feel free to open an Issue on this repo!

Changelog

  • 4/29 - Agent overlay update - pause/play/stop agent run in the browser

📋 Example MCP Server Output Report

📊 Web Evaluation Report for http://localhost:5173 complete!
📝 Task: Test the API-key deletion flow by navigating to the API Keys section, deleting a key, and judging the UX.

🔍 Agent Steps
  📍 1. Navigate → http://localhost:5173
  📍 2. Click     “Login”        (button index 2)
  📍 3. Click     “API Keys”     (button index 4)
  📍 4. Click     “Create Key”   (button index 9)
  📍 5. Type      “Test API Key” (input index 2)
  📍 6. Click     “Done”         (button index 3)
  📍 7. Click     “Delete”       (button index 10)
  📍 8. Click     “Delete”       (confirm index 3)
  🏁 Flow tested successfully – UX felt smooth and intuitive.

🖥️ Console Logs (10)
  1. [debug] [vite] connecting…
  2. [debug] [vite] connected.
  3. [info]  Download the React DevTools …
     …

🌐 Network Requests (10)
  1. GET /src/pages/SleepingMasks.tsx                   304
  2. GET /src/pages/MCPRegistryRegistry.tsx             304
     …

⏱️ Chronological Timeline
  01:16:23.293 🖥️ Console [debug] [vite] connecting…
  01:16:23.303 🖥️ Console [debug] [vite] connected.
  01:16:23.312 ➡️ GET /src/pages/SleepingMasks.tsx
  01:16:23.318 ⬅️ 304 /src/pages/SleepingMasks.tsx
     …
  01:17:45.038 🤖 🏁 Flow finished – deletion verified
  01:17:47.038 🤖 📋 Conclusion repeated above
👁️  See the “Operative Control Center” dashboard for live logs.

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