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    1 min read 5 stepsMarch 19, 2026Verified March 2026

    AI Agents: What They Are and How to Build Them

    Understand autonomous AI agents that can plan, use tools, and complete complex tasks independently.

    1

    What are AI agents?

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    Unlike chatbots that respond to single prompts, agents can plan multi-step tasks, use external tools (browse web, run code, call APIs), and iterate.
    2

    How agents work

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    The agent receives a goal → creates a plan → executes steps → observes results → adjusts the plan. This loop continues until the goal is achieved.
    3

    Popular agent frameworks

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    LangChain, CrewAI, and AutoGen are frameworks for building agents. OpenAI's Assistants API also supports agent-like behavior with tool use.
    4

    Real-world examples

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    Devin (AI software engineer), AutoGPT (general purpose), and customer service agents that can look up orders, process refunds, and update accounts.
    5

    Challenges and risks

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    Agents can go off-track, make expensive mistakes, or take unintended actions. Always implement guardrails, approval steps, and spending limits.

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    AI Agents: What They Are and How to Build Them — Step-by-Step Guide | TekSure