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Learn to build custom tools that bridge AI agents and real-world functionality in this 22-minute technical episode from Google Cloud Tech's "The Agent Factory" series. Master four essential architectural patterns for creating specialized agent capabilities through the hands-on construction of "FinWise," a comprehensive financial agent. Explore the Simple Function Tool pattern for stateless operations like real-time stock price checking, discover the Agent-as-a-Tool architecture for complex tasks requiring specialized skills, implement MCP (Model Context Protocol) tools for heavy computational services like portfolio optimization, and build Authenticated Tools that securely handle sensitive user actions such as stock trading. Gain insights into the latest industry trends including Agentic RAG for intelligent data fetching, new models like Kimi K2 and Qwen 3 optimized for tool use, and Google's GenAI Processors library and experimental Opal tool. Address critical development questions about choosing between Function Tools and OpenAPI Toolsets, integrating LangChain tools into ADK projects, and implementing best practices for testing long-running or asynchronous tools locally.
