LangChain 1.4 folds MCP support into langchain.mcp, replacing langchain-mcp-adapters. Migration guide, the MCPAdapter class, elicitation, and OAuth 2.1 setup.
LangGraph vs CrewAI vs Pydantic-AI vs OpenAI Agents SDK compared on control, state, memory, streaming and production ops. A 2026 decision guide, not a benchmark.
LangGraph v1.2 DeltaChannel slashes checkpoint overhead on long agent threads — the pattern, the wire-format change, and when to migrate from full snapshots.
Multi-agent orchestration in 2026 — MCP for tools, A2A for agent-to-agent, LangGraph for stateful flows. Reference architecture, picking criteria, and production patterns.