How to pass env variables to the MCP server when using Gemini SDK ?

[yrangana]

How to pass environment variables to the MCP server when using Gemini SDK ?

According to the Google GenAI SDK documentation, we can create StdioServerParameters and specify environment variables via the env argument, like this:

from google.generativeai.toolkit import stdio_client, StdioServerParameters

server_params = StdioServerParameters(
    command="npx",
    args=["-y", "@philschmid/weather-mcp"],
    env={"MY_ENV_VAR": "value"},  # Example environment variables
)

async def run():
    async with stdio_client(server_params) as (read, write):
        async with ClientSession(read, write) as session:
        # Prompt to get the weather for the current day in London.
            prompt = f"What is the weather in London in {datetime.now().strftime('%Y-%m-%d')}?"
            # Initialize the connection between client and server
            await session.initialize()
            # Send request to the model with MCP function declarations
            response = await client.aio.models.generate_content(
            ...

However, in the FastMCP documentation, MCP servers are started like this:

from fastmcp import Client
import google.generativeai as genai

mcp_client = Client("server.py")  # or Client("https://my-server.com/sse")
gemini_client = genai.Client()

async def main():
    async with mcp_client:
        response = await gemini_client.aio.models.generate_content(
            model="gemini-2.0-flash",
            contents="Roll 3 dice!",
            config=genai.types.GenerateContentConfig(
                temperature=0,
                tools=[mcp_client.session],  # Pass the FastMCP client session
            ),
        )
        print(response.text)

Is there a way to pass environment variables to the server when using `fastmcp.Client("server.py")?

Any insights or examples would be greatly appreciated!

[yrangana]

Update: I'm not sure if this is the correct or recommended approach, but I was able to pass environment variables to the server using:

mcp_client.transport.env = {"MY_ENV_VAR": "some_value"}

Would appreciate confirmation if this is the proper way to pass environment variables dynamically