Building AI Agents with Google Gemini 3 and Open Source Frameworks- Google Developers Blog

This post introduces Gemini 3 Pro Preview, highlighting new agentic features such as `thinking_level` for adjustable reasoning depth, stateful tool use via "Thought Signatures" for context retention, and `media_resolution` for adjustable multimodal fidelity. It details how these features integrate with open-source frameworks (LangChain, AI SDK by Vercel, LlamaIndex, Pydantic AI, n8n) to build sophisticated AI agents. Key best practices include simplifying prompts, keeping temperature at 1.0, handling thought signatures, and optimizing visual tokens.