Google has officially released the DevTools for Chrome 149, significantly expanding its integration with AI coding agents. The company detailed the update in an official blog post published on June 2, 2026 (What's new in DevTools ).
June 2, 2026 · Google Chrome DevTools
DevTools opens the browser to AI agents
Chrome 149's DevTools ships the 1.0 stable "DevTools for agents," Gemini-powered CSS completion, and in-chat analysis — letting AI agents write, run and debug code directly inside a real browser.
1.0
Stable release of DevTools for agents (MCP server & CLI)
3
Gemini 3 now powers AI assistance responses
4
Major new agent-focused capabilities shipped
The shift
Agents stop guessing the page from screenshots — they invoke structured tools directly.
Powered by WebMCP — a proposed standard letting pages register tools for agents, improving reliability and token efficiency over DOM interpretation.
What ships in Chrome 149 — and how to turn it on
DevTools for agents 1.0
Stable MCP server / CLI, custom tools
npm / agent extensions
CSS code completion
Gemini completion in the Styles tab
AI innovations settings
WebMCP debugging
Tool inspection / execution in Application panel
chrome://flags (experimental)
Agent walkthrough
Analysis results shown inside chat
Within AI assistance
Strengths
Gemini reads the actual DOM & CSS as live context
Changes apply live; sources saved via Workspaces
Fully in-browser, integrating Lighthouse and WebMCP
Caveats
Auto styling-fix slated for deprecation in Chrome 152
WebMCP debugging needs experimental flags
Very recent — broad real-world evaluation still pending
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