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Google Cloud Agent Platform Release Notes: Gemini 3.5 Flash default model for Memory Bank

Google Cloud Agent Platform Release Notes · article · Jun 29, 2026 · UTC

Gemini 3.5 Flash default model for Memory Bank The default model used for Memory Bank generation is now Gemini 3.5 Flash instead of Gemini 2.5 Flash. For information, see Set up Memory Bank. Semantic Governance Policies available in Public Preview Semantic governance policies and the policy engine are now available in Preview. Semantic governance policy provides an intelligent security and compliance layer that evaluates an AI agent's proposed tool calls against user intent and organizational business rules at runtime. Key capabilities include: Natural Language Constraints (NLC): Author declarative business rules and security guardrails in plain English without needing to write code or redeploy agent applications. Layered Intent Gating: Intercepts agent tool calls at runtime to verify alignment with trusted user intent and prevent unauthorized actions, rogue tool use, and data exfiltration. Granular Scoping: Apply constraints globally across all tools for an agent or target specific tools and parameters (e.g., enforcing strict financial limits or geographic restrictions). Agent Skills Lifecycle Governance: Protects agents from context poisoning and supply-chain exploits by governin

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