
Vanishing Gradients Episode 63: Why Gemini 3 Will Change How You Build AI Agents with Ravin Kumar (Google DeepMind)
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Nov 22, 2025 Ravin Kumar, a researcher at Google DeepMind specializing in generative models and LLM products, joins to discuss the groundbreaking Gemini 3. They illustrate how models can 'self-heal' and adapt, reshaping software development. Topics include the transition from basic tool calling to advanced agent harnesses, the contrast between deterministic workflows and high-agency systems, and the importance of robust evaluation infrastructures. Ravin also shares insights on the evolution of productive features like Audio Overviews and the future of multimodal agents.
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Models Now Do Multi-Minute Self-Repair
- Models like Gemini 3 can run multi-minute, multi-step reasoning sessions that call tools and self-correct repeatedly.
- This elevates models from short completions to self-sufficient problem solvers for complex tasks.
Three Rewrites Of Google Agent Harnesses
- Ravin rewrote internal agent harnesses three times in three years as model capabilities improved.
- He removed defensive logic when models could reliably handle tasks and rebuilt harnesses for new, more complex behaviors.
Stronger Models Support More Tools
- Better models can handle more tools in-context, reducing confusion and enabling broader multifunction agents.
- This lets a single agent handle diverse tasks instead of separate narrow bots.
