What makes an agent different from a chain. A chain is a fixed sequence of steps. An agent is an LLM that autonomously decides which actions to take, in what order, and when to stop. The core loop:...

Build a tool-use agent. Define 3-5 tools (e.g., search database, read file, call API, calculate, write output). Implement using Claude tool use or LangGraph ReAct. Test on 20+ representative tasks....

"Walk me through how you'd design an agent for [complex task]." Start with task analysis: is this a tool-use problem (agent needs to query APIs, databases), a code-generation problem (agent writes...