How to create tools with optional params

[mukuagar]

Question

I was creating a mcp server that has tools which has multiple params, in which most are optional, how do I represent this
Currently what I was doing is

param1: Optional[str] = Field(default=None, description="desc of param"),
    param2: Optional[str] = Field(default=None, description="desc of param 2")

The way it appears in inspector is:

"param1": {
  "anyOf": [
    {
      "type": "string"
    },
    {
      "type": "null"
    }
  ],
  "default": null,
  "description": "desc of param",
  "title": "param1"
},
"param2": {
  "anyOf": [
    {
      "type": "string"
    },
    {
      "type": "null"
    }
  ],
  "default": null,
  "description": "desc of param 2",
  "title": "param2"
}

Is this the right expectation with the anyOf block, or should that not exist?

Additional Context

No response

[mukuagar]

Went through servers built using typescript sdk, specifically this example here
Here the tools have optional params which come up in tools/list without the anyof tag, specifically if you see the read_text_file tool it has optional parameters named "head" and "tail". The tools/list response is

 {
      "name": "read_file",
      "description": "Read the complete contents of a file as text. DEPRECATED: Use read_text_file instead.",
      "inputSchema": {
        "type": "object",
        "properties": {
          "path": {
            "type": "string"
          },
          "tail": {
            "type": "number",
            "description": "If provided, returns only the last N lines of the file"
          },
          "head": {
            "type": "number",
            "description": "If provided, returns only the first N lines of the file"
          }
        },
        "required": [
          "path"
        ],
        "additionalProperties": false,
        "$schema": "http://json-schema.org/draft-07/schema#"
      }
    }