"Tool foo failed validation: schema must have a properties object"

[DanTup]

If an MCP server registers tools with no properties, this warning is printed the console for every tool.

However according to the spec, it appears that type is the only required field:

https://github.com/modelcontextprotocol/modelcontextprotocol/blob/20e5a21a1ca046db47af755ed8f0ca41eab4ed01/schema/draft/schema.json#L2391

I think this warning should be removed (or the MCP spec updated), because it seems like unnecessary noise.