LangChain API Models Cheat Sheet

Chains, agents, and evaluator integrations

Last Updated: November 21, 2025

Focus Areas

Focus
Chain API steps with LLM prompts for context
Add evaluators or callbacks to log outputs

Commands & Queries

langchain run agent --config agent.yaml
Execute an agent
python scripts/evaluate_chain.py
Run evaluations
langchain inspect chain.json
Check chain structure

Summary

Compose chains with API steps, log outputs, and evaluate regularly.

💡 Pro Tip: Unit test chains and capture eval metadata for reproducibility.
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