SMRTR ProgrammingJan 20, 2026GitHub Blog

Context windows, Plan agent, and TDD: What I learned building a countdown app with GitHub Copilot

SMRTR summary

During a live coding stream, a developer built a New Year countdown app using GitHub Copilot, exploring practical AI-assisted development patterns. The project evolved from basic timer to multi-timezone selector with fireworks, demonstrating context window management, Plan agent for requirement discovery, custom UI performance agents, and test-driven development with AI assistance.

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