AssistantAgent to support Workbench

[ekzhu]

Finishing up the work on workbench.

import asyncio
from autogen_agentchat.agents import AssistantAgent
from autogen_agentchat.ui import Console
from autogen_ext.models.openai import OpenAIChatCompletionClient
from autogen_ext.tools.mcp import StdioServerParams, McpWorkbench

async def main() -> None:
    params = StdioServerParams(
        command="uvx",
        args=["mcp-server-fetch"],
        read_timeout_seconds=60,
    )

    # You can also use `start()` and `stop()` to manage the session.
    async with McpWorkbench(server_params=params) as workbench:
        model_client = OpenAIChatCompletionClient(model="gpt-4.1-nano")
        assistant = AssistantAgent(
            name="Assistant",
            model_client=model_client,
            workbench=workbench,
            reflect_on_tool_use=True,
        )
        await Console(assistant.run_stream(task="Go to https://github.com/microsoft/autogen and tell me what you see."))
    
asyncio.run(main())

[codecov]

Codecov Report

Attention: Patch coverage is 89.47368% with 2 lines in your changes missing coverage. Please review.

Project coverage is 78.38%. Comparing base (0c9fd64) to head (b2873e9).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...t/src/autogen_agentchat/agents/_assistant_agent.py	94.44%	1 Missing ⚠️
...n-core/src/autogen_core/tools/_static_workbench.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6393      +/-   ##
==========================================
+ Coverage   78.36%   78.38%   +0.01%     
==========================================
  Files         221      221              
  Lines       16020    16024       +4     
==========================================
+ Hits        12554    12560       +6     
+ Misses       3466     3464       -2     

Flag	Coverage Δ
unittests	78.38% <89.47%> (+0.01%)	⬆️

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