Google's Agent Development Kit (ADK) enables building AI agents that can interact with external systems through various tool types. The framework supports function tools for inline calculations, built-in tools like Google Search, third-party API integrations via LangChain, and Model Context Protocol (MCP) tools for databases and APIs. A practical example demonstrates creating a bug assistant agent for a coffee company that can search tickets, query GitHub issues, and interact with PostgreSQL databases using these different tool types.
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