Versioned docs are already supported - each publish saves a new version with the previous ones remaining accessible. Diffs are coming too.
I think the co-editing/collaboration is very interesting. We currently support comments by anyone in your org with agents editing and resolving based on them (importantly, keeping the identity on whose behalf they’re acting intact).
I think all major platforms will add some sort of artifact sharing (case in point Anthropic today).
Where we differ is in thinking that agent knowledge work needs to be on a neutral surface, never vendor locked, and accessible to everyone in your org, regardless of whether they hold a certain vendor’s license. Hence our take on flat org-based pricing (no per seat) in the paid tiers.
I wonder how much the providers will build this in as a core feature - I'm sure gemini will have shared artifact workspaces at some point.
Have you thought about diffs and versioned documents? I'm curious waht's out there adn couldn't find a good solution but I think collaborative ai-enabled editing is in its infancy.