refactor(mcp): address async warnings

[jer96]

Description

@pgrayy discovered that async warnings have emerged after merging #406 . This PR address those warnings.

Related Issues

Documentation PR

Type of Change

Address warnings

Testing

How have you tested the change? Verify that the changes do not break functionality or introduce warnings in consuming repositories: agents-docs, agents-tools, agents-cli

• I ran hatch run prepare

Tested with sample script

import logging

from mcp import StdioServerParameters, stdio_client

from strands import Agent
from strands.models.openai import OpenAIModel
from strands.tools.mcp import MCPClient

logging.basicConfig(level=logging.DEBUG)


stdio_mcp_client = MCPClient(
    lambda: stdio_client(StdioServerParameters(command="uvx", args=["awslabs.aws-documentation-mcp-server@latest"]))
)

with stdio_mcp_client:
    tools = stdio_mcp_client.list_tools_sync()

    model = OpenAIModel(
        {
            "api_key": API_KEY,
        },
        model_id="gpt-4o",
    )
    agent = Agent(model=model, tools=tools, callback_handler=None)
    result = agent("what tools do you have")
    result = agent("get me details about lambda, dynamodb, sqs and aurora")
    print(result.message)

Checklist

• I have read the CONTRIBUTING document
• I have added any necessary tests that prove my fix is effective or my feature works
• I have updated the documentation accordingly
• I have added an appropriate example to the documentation to outline the feature, or no new docs are needed
• My changes generate no new warnings
• Any dependent changes have been merged and published

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