Agent Browser Protocol (ABP): Deterministic Browser Automation for AI Agents
By
theredsix
Slow-proofed and worth the wait. Worth its weight in flour.
Summary
The article introduces ABP (Agent Browser Protocol), a Chromium fork designed for deterministic browser automation that works seamlessly with AI agents like Claude, Codex, and OpenCode. It reformats web navigation into discrete, multimodal chat formats that agents can understand, achieving 90.53% accuracy on Online Mind2Web benchmarks. The browser freezes pages between agent actions to prevent race conditions and provides settled page states (screenshots + events) per tool call. The protocol integrates MCP (Model Context Protocol) and REST directly into the browser engine, offering reproducible results and easy setup for AI-powered web automation.
Key quotes
· 5 pulledABP reformats web navigation into the discrete, multimodal chat format agents know and love.
ABP is a Chromium fork with MCP + REST baked directly into the browser engine.
What you should notice: every tool call returns a settled page state (screenshot + events), and the page freezes between steps so Claude never races the browser.
90.53% on Online Mind2Web — reproducible results
Deterministic browser automation. Works out of the box with Claude/Codex/OpenCode
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