Python client incompatible with typescript server

[p11o]

Describe the bug
Python client is not compatible with Typescript Server.
Python sdk v1.5.0
Typescript sdk 1.7.0

To Reproduce

import asyncio
from mcp import ClientSession, StdioServerParameters
from mcp.client.stdio import stdio_client


async def connect_to_server():
    server_params = StdioServerParameters(
        command="bun",
        args=["index.ts"],
        env=None
    )
    async with stdio_client(server_params) as (read, write):
        async with ClientSession(read, write) as session:
            await session.initialize()
            val = await session.call_tool("tool", {})
            print("\nResponse from tool:", val)

asyncio.run(connect_to_server())

import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
import { z } from "zod";

(async () => {
  const server = new McpServer({
    name: "example",
    version: "0.1.0"
  });

  server.tool(
    "tool",
    "my tool description",
    z.object({
     "arg1": z.string().optional(),
     }).shape,
    async (args) => {
      return { "tool": "test" };
    }
  );
  const transport = new StdioServerTransport();
  await server.connect(transport);
})();

      |   File "/app/.venv/lib/python3.13/site-packages/pydantic/main.py", line 627, in model_validate
      |     return cls.__pydantic_validator__.validate_python(
      |            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
      |         obj, strict=strict, from_attributes=from_attributes, context=context
      |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      |     )
      |     ^
      | pydantic_core._pydantic_core.ValidationError: 1 validation error for CallToolResult
      | content
      |   Field required [type=missing, input_value={'tool': 'test'}, input_type=dict]
      |     For further information visit https://errors.pydantic.dev/2.10/v/missing

Expected behavior

It should accept the response. There is validation on the response from the mcp server in the python client that is incompatible somehow.

Screenshots
N/A

Desktop (please complete the following information):

• OS: Ubuntu