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name: "agentic-tooluse" description: "Tool use pattern for agents requiring external world interaction. Foundation layer for most real-world agentic tasks. Design principles for effective tool contracts."

Agentic Tool Use Pattern

[!TIP] TL;DR: Tool use is the foundation layer for most agentic patterns. If a task requires external data, state, or actions, tools are required. Tool use sits UNDER the reasoning layer, not alongside it. Key Principle: "A ReAct agent with tools is still ReAct, and a planning agent with tools is still planning."

Pattern Overview

Tool use enables agents to interact with the external world:

• Query databases
• Call APIs
• Retrieve documents
• Execute code
• Modify system state