Google Interactions API: The 2025 Guide to Unified Gemini Models & Agents

Google Interactions API: The Unified Foundation for Gemini Models and Agents (2025 Guide) Featured Snippet Answer (Perfect for Google’s Position 0) Google Interactions API is a single RESTful endpoint (/interactions) that lets developers talk to both Gemini models (gemini-2.5-flash, gemini-3-pro-preview, etc.) and managed agents (deep-research-pro-preview-12-2025) using exactly the same interface. Launched in public beta in December 2025, it adds server-side conversation state, background execution, remote MCP tools, structured JSON outputs, and native streaming — everything modern agentic applications need that the classic generateContent endpoint couldn’t comfortably support. Why I’m Excited About Interactions API (And You Should Be Too) If you’ve …