Why Function Calling Is More Important Than Prompt Engineering
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Function calling is argued to be more impactful than prompt engineering for building practical AI applications. While prompt engineering improves text outputs, function calling enables AI models to interact with external systems — APIs, databases, crawlers, and custom tools — transforming them from chatbots into agents capable of executing real tasks. The author shares a personal shift in development approach, noting that connecting tools to models produced far greater performance gains than prompt refinement. Function calling also promotes better software architecture by separating business logic from prompts, making systems easier to maintain, scale, and test. Prompt engineering still matters, but as one component of a larger system rather than the primary skill.
