[RFC] Allow roots other than file://

[olaservo]

See: modelcontextprotocol/modelcontextprotocol#505

[noctonic]

👀

[olaservo]

I think we should revive this small but potentially significant change, so now that there is a new process for proposals I left a comment in the original issue about picking this back up: modelcontextprotocol/modelcontextprotocol#507 (comment)

[noctonic]

I am happy to hand this off to anyone that has time to go through the process.