Dynamically configure server capabilities

[mattt]

Currently, you initialize a Server with capabilities defined up front:

import MCP

let server = Server(
    name: "MyServer", 
    version: "1.0.0",
    capabilities: .init(
        resources: .init(
            subscribe: true
        )
    )
)

It'd be nice to omit the capabilities argument entirely, so that the server determines its capabilities dynamically, based on what handlers have been registered.

[stallent]

Conceptually i get it, but see the other issue I just opened. Two of your three properties above (list and read) do not exist in the spec so curious if the value is still there without these? Unsure.

[mattt]

@stallent Thanks for opening #14. That's resolved by #15. Regarding this enhancement specifically, the idea is that the caller could omit an explicit capabilities argument in the initializer; if it supports tools/list and tools/call, then it'd have the effect of capabilities: .init(tools: .init()).