AI Coding Agents Need Tests More Than Prompts

Short summary

AI coding agents (GPT-5.3, Claude 4.5) are now genuinely productive for multi-file tasks, but struggle with UI testing. The solution: write features testable from the command line first, with well-designed tests that become the agent's steering wheel. Tests matter more than prompts because they create an executable feedback loop agents can operate independently.

• •AI agents now productive for complex tasks but weak at UI/visual testing
• •Solution: test-first workflow with command-line exercises and structured outputs
• •Well-designed tests become steering wheels—agents need measurable targets, not just prompts

Generated with AI, which can make mistakes.