Function Calling

Introduction: Why Structured Output Matters # In 2026, large language model (LLM) applications have evolved from simple chatbots to complex autonomous agent systems. Throughout this evolution, one fundamental technical challenge has persisted: how to make LLM outputs reliably parseable by programs. Traditional LLM output is free-form text, forcing developers to use fragile approaches like regex and string matching to extract information. Structured Output and Function Calling (Tool Use) technologies have completely changed this paradigm.

引言：为什么结构化输出如此重要？ # 2026年，大语言模型（LLM）的应用已经从简单的聊天机器人发展到复杂的自主Agent系统。在这个过程中，一个关键的技术挑战始终存在：如何让LLM的输出可靠地被程序解析？