AI Multi-Agent Systems 2026
What Multiple AI agents collaborating on tasks. Patterns - Orchestrator + workers - Peer-to-peer - Hierarchical - Specialist roles - Adversarial one critiques another Frameworks - CrewAI - LangGraph - AutoGen - Anthropic Agent SDK sub-agents Use Cases - Research planner + searcher + summarizer - Code review security + style + tests - Customer service intake + specialist + escalation - Content wri…