OpenSpec

OpenSpec isn't trying to be another AI coding agent. It's a planning layer that sits between your brain and your agent, forcing you to think before you type. If you've ever had a Cursor session spiral into a mess of mismatched features, you'll get why this exists. When to pick this: teams that use AI coding assistants but keep getting off-track. The spec-as-code approach is perfect for multi-session features where context would normally evaporate. Solo devs working on complex brownfield projects will also get value — the spec deltas make it dead simple to see what changed across sessions. When to pass: if you're strict about minimal overhead and just want to prompt your way through simple scripts, this adds ceremony that isn't welcome. Also skip if you need a fully managed SaaS with a GUI — OpenSpec is CLI-only, though workspace features are coming. Compared to tools like Copilot's inline chat or Cursor's Composer, OpenSpec doesn't compete on code generation. It complements them with a spec layer that lives in git. The spec deltas turn vague feature requests into reviewable, version-controlled documents. Think of it like git for intent. Real-world caveats: setting up specs for existing codebases requires discipline — you have to write specs as you go, not generate them all at once. The team features (multi-repo, collaboration) are still in development, so large teams may feel the pain. Also, OpenSpec works best when everyone on the team buys into the spec-first workflow, which is a cultural shift.