Three rival approaches to agent access battle for the app interface layer

In one week of October 2026, three incompatible approaches to how AI agents reach applications collided: the WebMCP standard from Google and Microsoft in Chrome 149, OpenAI's ChatGPT Chrome browser agent with 7 million users, and CLI-Anything (55,400 GitHub stars), which wraps desktop apps in agent-native CLIs. Each is a bid to control the interface layer between agents and the web.

• WebMCP requires sites to explicitly register tools via navigator.modelContext
• ChatGPT Chrome operates across open tabs without site-side integration
• CLI-Anything reached 55,400 GitHub stars with +607 per day
• Early WebMCP adopters include Shopify, Expedia, Instacart and Redfin