https://www.youngju.dev/blog 천천히 올바르게. AI Researcher & DevOps Engineer Youngju's tech blog. GPU/CUDA, LLM, MLOps, Kubernetes AI workloads, distributed training, and data engineering. ko fjvbn2003@gmail.com (Youngju Kim) fjvbn2003@gmail.com (Youngju Kim) Sat, 16 May 2026 00:00:00 GMT https://www.youngju.dev/blog/culture/2026-05-16-ai-agent-frameworks-langchain-langgraph-llamaindex-crewai-autogen-pydanticai-mastra-dspy-mcp-2026-deep-dive.en https://www.youngju.dev/blog/culture/2026-05-16-ai-agent-frameworks-langchain-langgraph-llamaindex-crewai-autogen-pydanticai-mastra-dspy-mcp-2026-deep-dive.en A complete picture of the AI agent framework market as of May 2026. LangChain holding share despite brand fatigue, LangGraph state-graph pattern, LlamaIndex RAG depth, CrewAI/AutoGen multi-agent, PydanticAI type safety, Mastra TypeScript camp, DSPy prompt programming, Instructor and Outlines structured output, MCP/A2A standards, LangSmith/Phoenix/Langfuse observability, Mem0/Zep memory, Guardrails/NeMo Guardrails — all compared with real APIs. Sat, 16 May 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) ai-agentslangchainlanggraphllamaindexcrewaiautogenpydantic-aimastradspymcpa2aagent-evalinstructorguardrails https://www.youngju.dev/blog/culture/2026-05-16-ai-agent-frameworks-langchain-langgraph-llamaindex-crewai-autogen-pydanticai-mastra-dspy-mcp-2026-deep-dive.ja https://www.youngju.dev/blog/culture/2026-05-16-ai-agent-frameworks-langchain-langgraph-llamaindex-crewai-autogen-pydanticai-mastra-dspy-mcp-2026-deep-dive.ja 2026年5月時点で、AI エージェントフレームワーク市場の全体像を描き切る。LangChain がブランド疲労にも関わらずシェアを保つ理由、LangGraph の状態グラフ、LlamaIndex の RAG の深さ、CrewAI/AutoGen のマルチエージェント、PydanticAI の型安全、Mastra の TypeScript 陣営、DSPy のプロンプトプログラミング、Instructor と Outlines の構造化出力、MCP/A2A 標準、LangSmith/Phoenix/Langfuse の観測、Mem0/Zep のメモリ、Guardrails/NeMo Guardrails まで、実際の API と共に比較する。 Sat, 16 May 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) ai-agentslangchainlanggraphllamaindexcrewaiautogenpydantic-aimastradspymcpa2aagent-evalinstructorguardrails https://www.youngju.dev/blog/culture/2026-05-16-ai-agent-frameworks-langchain-langgraph-llamaindex-crewai-autogen-pydanticai-mastra-dspy-mcp-2026-deep-dive https://www.youngju.dev/blog/culture/2026-05-16-ai-agent-frameworks-langchain-langgraph-llamaindex-crewai-autogen-pydanticai-mastra-dspy-mcp-2026-deep-dive 2026년 5월 기준, AI 에이전트 프레임워크 시장의 완전한 그림을 그린다. LangChain의 브랜드 피로감에도 불구한 점유율, LangGraph의 상태 그래프 패턴, LlamaIndex의 RAG 깊이, CrewAI/AutoGen 멀티 에이전트, PydanticAI의 타입 안전성, Mastra의 TypeScript 진영, DSPy의 프롬프트 프로그래밍, Instructor와 Outlines의 구조화 출력, MCP/A2A 표준, LangSmith/Phoenix/Langfuse 관측, Mem0/Zep 메모리, Guardrails/NeMo Guardrails까지 실제 API와 함께 비교한다. Sat, 16 May 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) ai-agentslangchainlanggraphllamaindexcrewaiautogenpydantic-aimastradspymcpa2aagent-evalinstructorguardrails