Sharing AI skills via Dropbox might sound too simple to work

The original Sx was strictly a CLI tool, which is great for us engineers who live in the terminal, but it completely ignored the legal or marketing folks who actually need to use these AI "skills" without touching a Git repo. You can't exactly expect a department head to master version control just to access a specific prompt or workflow. The transition to Sx 2.0 shifts the focus toward a native desktop app for Mac, Windows, and Linux, which makes much more sense for enterprise-wide adoption.

What caught my eye as a developer is how they reworked the vault format. Instead of it being some proprietary black box, it's designed to work directly as a plugin for Claude or Codex. The logic here is that if you store your vault in something like Dropbox, Google Drive, or iCloud, the synchronization and permissioning are handled by the cloud provider you already trust. It basically turns a standard file-syncing service into a collaborative prompt-management backend.

They've also opened it up with an extension system. This isn't just for show; it includes tools for Skill Evals and LLM de-duping. From an ML engineering perspective, being able to run metrics on your skills is what separates a hobbyist's prompt collection from a professionalized workflow. If you want to dig into the architecture or the extensions, the source is available under Apache-2.0.

https://github.com/sleuth-io/sx-extensions

https://github.com/sleuth-io/sx