If Copilot is: - creating unnecessary tests - writing messy legacy code - not following your instructions

Say hello to Spec Kit. Spec Kit is GitHub's open source tool that brings spec-driven development to your existing codebase, not just new projects.

It works really well with Copilot (but it also works with any other agentic tool you’re using).

How Spec Kit works: - Define your intent (spec + plan) - Break plan into tasks - Let AI implement with YOUR rules ✨ - Review code that follows your architecture

The shift: Your spec becomes the source of truth. Code follows intent, not the other way around.

This means architecture rules, security constraints, and design decisions are baked in from the start, not bolted on afterwards.

Where spec-driven shines: ✅ Existing projects that need structure ✅ Adding features to complex codebases ✅ Legacy rebuilds ✅ Greenfield that won't turn into a mess

Your turn: Let’s spec it out together. github.com/github/spec-kit

@github 🔗 detailed walkthrough on how to use spec-kit dzlab.github.io/ai/software%20…

@github Hello, I don’t understand why you would allow others to be able to manipulate my script which I strived to compile, despite privatizing it. That’s exploitation to me. People shouldn’t be allowed to have access to my repository in any way except I allow it.

@github Already started to try to use it. Love the clarify and plan stuff. But there are two thing that ennoy me. The naming strategy of branches and how to deal with my list of tasks when I discover than my spec was wrong.

@github I cannot stand how obvious it is that GPT-5 generated this series of tweets AND the full documentation in the repo "flips the script" followed by an em dash

@github Why isn’t this part of copilot instructions?