Only fetch MCP capabilities if the server has defined it supports them

[mollux]

Somewhere between a bug and a feature:

Currently the possible tools, resources and resources templates are fetched in the McpHub.connectToServer method.

Based on the spec, during Initialization phase, the capabilities of both client and server must be negotiated.

So it would make sense to ensure that e.g. resources are not fetched (or give an error while trying to fetch them) if the server already defined it doesn't support them.

If this makes sense, See #3357

cc @dennismeister93

[dennismeister93]

Thanks for bringing this up @mollux, maybe create the PR as proposal and link it here? :)

[mollux]

done, updated the discussion