How AI Agents Decide Which Tool to Use

Posted on Wed 09 September 2026 in GenAI • Tagged with GenAI, AI-agents, AgenticAI, ToolCalling, FunctionCalling, LLM, LargeLanguageModels, AI-tools, AgentArchitecture, Reasoning, Planning, DecisionMaking, ContextEngineering, AIEngineering, Automation, RAG, GenerativeAI

Introduction

AI agents are different from traditional chatbots because they can do more than generate text. An agent can interact with external tools such as APIs, databases, search engines, calculators, code interpreters, file systems, and business applications.

But this creates an important question:

How does an AI agent decide which …


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