bug: ToolInputSchema design flaw

[kaliwin]

Description

I think this "ToolInputSchema" structure is wrong. If the parameters are a complex nested object, then this structure cannot be expressed. The "Required" parameters should be defined in each object, not uniformly defined in the root object.

https://github.com/mark3labs/mcp-go/blob/main/mcp/tools.go#L518

type ToolInputSchema struct {
	Type       string         `json:"type"`
	Properties map[string]any `json:"properties,omitempty"`
	Required   []string       `json:"required,omitempty"`
}

I expect the parameter structure

type Args struct {
	Area Area
}

type Area struct {
	City    []string 
	Country string   
}

This is a nested object that I cannot represent using "ToolInputSchema"

I think you can refer to https://github.com/googleapis/go-genai/blob/main/types.go#L903

If I understand it wrong, please let me know
If you need coding collaboration, I'm happy to help