Show HN: Primer – build software with AI agents one milestone at a time

This is a really good framing honestly. Spec-first tools are useful, but milestone-first feels way better for actually learning and not getting lost after step 2.

I like that you keep things verifiable at each step too, thats the part most AI coding tools skip and then people think theyre progressing when theyre just generating code.

how do you decide milestone size so its not too tiny but also not overwhelming? do you track failed attempts/retries as part of progress, or only completed milestones? Also are you planning a mode where users can switch between learning path and spec mode in the same project? I think that could be very strong.

Have you seen openspec, or any of the others in this space?