Agent Browser Protocol: Open-source Chrome fork for AI agents achieves 90% on Mind2Web benchmark

Agent Browser Protocol: A browser built for AI agents

Agent Browser Protocol (ABP) is an open-source browser fork of Chrome specifically designed for AI agents. The project was created as a challenge to build an agent-centric browser and capture the top score on the Online Mind2Web Benchmark.

Key technical approach

The main insight behind ABP is that AI agents excel at turn-based chat but struggle with continuous time decision making. To maximize LLM performance on browser tasks, ABP converts web browsing into multimodal chat by:

• Freezing JavaScript and time after every action so the webpage is frozen while the agent thinks
• Capturing all relevant events resulting from actions including file pickers, downloads, permission requests, and dialogs
• Returning these events together with a screenshot of the frozen page so the agent can reason holistically about the browser state with full context

Performance and development

ABP achieved 90.53% on the Online Mind2Web Benchmark, holding the top score for two days until GPT-5.4 surpassed it with 92.8%. The developer used Claude Opus-4.5 to work on the project during nights and weekends, completing it within two months.

Practical applications

According to the source, ABP excels at:

• Filing forms
• Online shopping
• Downloading files
• Uploading files
• Ordering takeout
• Reverse engineering a website's undocumented APIs

Getting started

To add ABP to Claude Code:

claude mcp add browser -- npx -y agent-browser-protocol --mcp

Then you can give Claude commands like:

Find me kung pao chicken near 415 Mission St, San Francisco on Doordash.

Resources

GitHub repository: https://github.com/theredsix/agent-browser-protocol

Benchmark results: https://github.com/theredsix/abp-online-mind2web-results