Independent test: AI coding agent vs Primer, 14 of 15 runs shipped, one didn't

[pjhawksr]

While testing an AI coding agent with Primer, one of 15 runs hit a small form-submission issue. The agent followed Primer’s Forms guidance, including “Validation on submit,” but that section doesn’t mention that Primer Button defaults to type="button". It assumed the component behaved like a native HTML button and left out type="submit", so the form didn’t submit. A quick note in the “Submission” section, perhaps with a short code example, could help people and agents avoid the same issue. Full test writeup if helpful: technical study and evidence.