Vibe coding got me 80% there. Spec-Driven Development got me the other 20%.
I like vibe coding. I'm not here to shame anyone out of it. Some of the best things I've shipped started as a half-formed idea typed into a chat box at 11pm. But if you've done this for more than a weekend, you know the shape of the problem. The first prompt is magic. The fifth one is negotiation. By the fifteenth you're re-explaining a decision you already made twice, the agent has quietly…
Vibe coding can get you 80% of the way there, but Spec-Driven Development gets the remaining 20%. Vibe coding is a chaotic, intuitive approach to coding that can produce great results, but it often involves a lot of trial and error. Spec-Driven Development, on the other hand, is a more structured approach that involves writing specifications for the system first, and then generating the code from those specifications.
This approach has several advantages, including clearer requirements, fewer bugs, and easier maintenance. Spec Kit is an open-source toolkit that makes Spec-Driven Development practical. It provides a set of commands and files that can be used to generate specifications, checklists, plans, tasks, and analyze the spec against the plan and tasks.
The toolkit also includes a "constitution" file that holds the non-negotiable requirements for the project. By using Spec Kit, developers can catch misunderstandings early, make the work reviewable by non-technical stakeholders, and ensure that the code is maintainable and scalable. The toolkit has been adopted by GitHub and AWS, and there is a growing body of academic literature and community walkthroughs that support its effectiveness.
However, it is worth noting that some experts argue that specifications should not replace code as the source of truth.
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