Google has thrown open its smart-home stack to rival AI agents, quietly launching Model Context Protocol (MCP) early access in Google Home Premium Advanced and letting third-party assistants — including Anthropic's Claude — monitor and control Nest cameras, thermostats and Matter lights.
MCP arrives at the smart-home layer
Announced September 16, 2026 as a Developer Center rollout for U.S. English users, the feature exposes the Google Home Graph over Anthropic's open Model Context Protocol. Homeowners create a Google Cloud project, install a supported MCP client, and grant it scoped access to their Nest doorbells, cameras, thermostats and Matter light bulbs. Google's own Gemini-powered Google Antigravity agent, Anthropic Claude, OpenClaw and Nous Research's Hermes are named as compatible clients at launch.
Google has bundled safety guardrails on top of the raw MCP surface: agents cannot unlock doors, disarm alarms, initiate emergency calls or perform any action Google flags as "sensitive" without an in-app confirmation from the owner. Every command also lands in the Home activity log with the calling agent identified, giving users an audit trail across models.
A first mover ahead of Apple and Amazon
The rollout hands Google a lead on Apple Home and Amazon Alexa, neither of which supports third-party MCP clients yet, and it turns Google Home into a neutral execution surface for whichever AI assistant its owner prefers rather than a captive endpoint for Gemini alone.
Why now
Anthropic's Model Context Protocol has become the default plumbing for agentic AI in 2026, adopted by Anthropic's own Claude products, the newly relaunched Claude Cowork suite, OpenAI's Codex, and now Google's smart-home graph. By backing MCP rather than a proprietary bridge, Google admits what industry watchers have long said: the connector layer between agents and physical systems is being standardised, and platform loyalty is shifting from voice assistant to whichever agent the user trusts to make decisions in their home.
Google says wider rollout, additional device categories and non-US English support will follow the early-access phase, subject to feedback from developers who complete the Home Developer Center onboarding.
Reporting based on coverage from 9to5Google, TechCrunch, Unite.AI and Google's Home Developer Center.