Google adds hooks and new models to Gemini Managed Agents API

Google's Gemini API added new capabilities to its Managed Agents offering, including "hooks" for customizing agent behavior and access to the Gemini 3.6 Flash model, aimed at helping developers build more reliable, production-ready AI agents.

Why it matters: This is part of the broader competition among model providers to own the agent-infrastructure layer, not just the underlying model, putting Gemini's tooling more directly against OpenAI's and Anthropic's own agent-building platforms. Bundling the feature update with a new Flash-tier model also shows Google shipping quickly on its Gemini 3.6 line.