I built ContextSync to solve this using a "decentralized" approach. Instead of building a complex backend, it saves your chat history as structured Markdown files in a synced folder (like OneDrive or iCloud). If you use Obsidian, it essentially turns your vault into a "shared brain" for your team's AI.

Key Tech Info:

Built with the VS Code Language Model API.

Local-first: No third-party servers; you own the data in your vault.

Structured Markdown: Files include YAML frontmatter for easy indexing.

I'd love to hear your thoughts on the approach or any bugs you find.