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AI Agents & Applications · intermediate · concept 237 of 311 · Updated Nov 4, 2026

AI Agents

AI systems that can plan, use tools, browse the web, write code, and complete multi-step tasks autonomously. The defining frontier of the current AI era. Frameworks such as LangGraph and CrewAI, plus vendor SDKs (OpenAI Agents SDK, Claude Agent SDK, Microsoft Agent Framework), are common starting points. The 2023 Auto-GPT and BabyAGI wave proved both the appetite and the limits; today's agents descend from those loops running on far better models.

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Key terms

Tool usePlanningReActReasoning loopAutonomyAuto-GPT era

Where you meet it in the real world

Coding assistants, research automation, customer service, data analysis