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Why AI Agent Systems Become Messy

Oct 2, 2026by Nielsen Norman Group

Non-engineers building AI agent systems often create messy and fragile tools because they lack proper architectural planning.

Many people with little technical background now build complex systems with AI agents. They want help with their daily work. They use large context libraries to guide their AI assistants. This process is software engineering. But builders often skip careful planning because AI makes building very cheap and fast.

In the past, software engineers learned that patched systems become very fragile. They called these poorly planned designs a big ball of mud. Today, AI users repeat this history. They build things quickly for short-term goals. They do not think about long-term durability or clean architecture.

Building with AI is so easy that people often overbuild their tools. They add many fancy features and tools that they do not truly need. They feel productive, but the systems grow in random, piecemeal ways. Users keep adding new pieces to the original setup without a clear plan.

Soon, the creators lose track of where important files live. They rely completely on the AI to find information and fix errors. If the AI tool breaks or deletes data, the users struggle to rebuild the system themselves. They become dependent on the AI to navigate their own messy files.

To keep a system healthy, users must track their context files carefully. They need to understand what each file does. If they lose control of their files, reconstruction becomes the only choice. Good habits and regular checks help prevent total system failure.

Key expressions

  • patch together

    대충 기워 맞추다

    Developers often patch together quick solutions for urgent bugs.

  • lose track of

    ~을 놓치다, 파악하지 못하다

    It is easy to lose track of time when working with AI.

  • rely on

    ~에 의존하다

    Many workers rely on digital tools every day.

Generated with AI. AI can make mistakes.