Tool calling enables LLMs to invoke external functions and APIs, transforming them from chatbots into capable agents. A three-pillar framework organizes tools into data access (read-only retrieval from databases, APIs, and file systems), computation (processing and transforming data through code execution and ML models), and

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What Tool Calling Is and Why It MattersThe Three-Pillar Framework: Data Access, Computation, and ActionsHow the Three Pillars Work Together in ProductionTool Calling vs. Model Context Protocol (MCP)Advanced Considerations for Production AgentsNext Steps

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