I had an idea that devs could build wasm modules that would define tools and instructions, and a harness could load them. Kind of like MCP but with certain assurances about the sandboxing. You could build a package manager around these behaviours.

I still kind of think it’s a decent idea but it’s too close to MCP with drawbacks that make it a harder sell than MCP. It’s hard to compete on functionality from a secure sandbox if users decide they don’t care about security.