LangChain, LangGraph, AutoGen, CrewAI, LlamaIndex — choose based on workflow complexity and use case.
Agent Frameworks Comparison
Framework
Best For
Complexity
Key Feature
LangChain
Quick prototypes
Low
400+ integrations
LangGraph
Stateful workflows
Medium
Graph-based control flow
AutoGen
Code generation
Medium
Multi-agent conversation
CrewAI
Role-based teams
Low
Simple crew definition
LlamaIndex
RAG-heavy agents
Medium
Advanced retrieval
Haystack
NLP pipelines
Medium
Production-ready
Custom (raw API)
Full control
High
No overhead
# Choose based on needs:
# Quick prototype? -> LangChain / CrewAI
# Complex workflows? -> LangGraph
# Code automation? -> AutoGen
# RAG-heavy? -> LlamaIndex
# Production custom? -> Raw Anthropic/OpenAI API
# Framework-agnostic tips:
# 1. Define tools clearly with good descriptions
# 2. Cap max iterations (prevent runaway loops)
# 3. Log every tool call for debugging
# 4. Handle tool failures gracefully
# 5. Test with mocked tools before real integration