Developer Tests AI Coding Limits Building a Geometry Calculator Tool

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A developer building a browser-based utility suite used AI assistance across three sessions to create a geometry calculator supporting eight shapes, dynamic inputs, SVG diagrams, bilingual text, and dark mode. The AI quickly generated a functional initial version with clean architecture and correct mathematical formulas, but failed to handle edge cases such as invalid triangle inputs, returning NaN without any user warning. Dark mode implementation also had a blind spot: SVG diagrams used hardcoded colors and became invisible against dark backgrounds until CSS variables were manually applied. Each bug required the developer to intervene and patch logic the AI had overlooked in its otherwise well-structured output. The experience highlighted a recurring pattern in AI-assisted development — strong performance on standard cases, but human oversight remains essential for edge-case handling and cross-component consistency.

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