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AI Agents Trends: Open-Source Agent Stacks Are Settling Into Clear Roles for SMBs and Creators

Verified September 8, 2026 signals from Pydantic, LangGraph, LlamaIndex, Strands Agents, and Mastra show a practical AI agent trend: open-source agent stacks are no longer racing to be the universal framework. They are settling into clear roles — type-safe Python, stateful graphs, lightweight event-driven workflows, AWS-native loops, and full-stack TypeScript — that small operators can actually pick between.