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Agent Foundations & LCEL Composition
Deconstruct autonomous agent architectures versus deterministic workflows. Master LangChain Expression Language (LCEL) composition, operator overloading, and structured tool binding with Pydantic v2 schemas.
Module Content
What an AI Agent Actually Is
A practical definition. Strip away the hype: agents are LLMs that decide what to do next. FIND_VIDEO: search 'what is an AI agent definition explained' — recommended channel: LangChain / AI Engineer / Harrison Chase. Aim for 10 min or under.
Quiz: Agents vs Chains vs Workflows
The terminology is muddy. Here's the distinction that actually matters when you're building.
Modern LangChain Architecture & Tool-Calling Agents
LangChain has evolved fast. Here's what's current, what's deprecated, and where to put your effort. FIND_VIDEO: search 'langchain 2026 LCEL latest version' — recommended channel: LangChain / Sam Witteveen / James Briggs. Aim for 11 min or under.
Quiz: The LangChain Ecosystem
LangChain isn't just one library. The ecosystem has four pieces; you'll use all of them.
Building Reactive Chains with LCEL
The pipe-based composition pattern. Once you see it, every LangChain example becomes readable. FIND_VIDEO: search 'LCEL LangChain Expression Language tutorial' — recommended channel: LangChain / Sam Witteveen. Aim for 10 min or under.
Quiz: LCEL Patterns & Operator Composition
Five LCEL patterns cover 90% of chain-building. Master them; everything else is variations.
Tools, Toolkits, and Structured Function Binding
The @tool decorator and bind_tools API. The foundation for agentic behavior in LangChain. FIND_VIDEO: search 'langchain tools tool calling tutorial' — recommended channel: LangChain / Sam Witteveen / Greg Kamradt. Aim for 11 min or under.
Quiz: Tool Design & Schema Validation
Tools turn LLMs into action-takers. Design them well — the LLM decides which to call based on the descriptions.
Case 1 — Autonomous Financial & SQL Tool-Calling Agent
You have a working LCEL chain. It needs loops, retries, and human review. Refactor to LangGraph properly.