Came across spec-driven development tools

Lately I’ve been experimenting with writing a short spec before coding like constraints, edge cases and then implementing against that.

I originally stumbled into this approach after seeing a tool (Traycer) built around spec-driven workflows.

Tried applying the idea manually with Copilot and other assistants, and fewer weird assumptions from AI was the key

Feels like giving AI a plan works better than just prompting it to “build something.”

Curious if others here are using spec-first approaches in real projects?