Parsing result from tool call in MCP

[perfogic]

Hello teams, i'm using MagneticOneGroupChat for my project and i face the problem as result:
The result from tool call is a string like this: "[TextContent(type="text", text="123123")]", this is hard for me to render it beauty on UI. The UI on autogen studio is displaying all raw text nơ:

When i check the code, all the value is dump as string which lead to having class being formated: https://github.com/microsoft/autogen/blob/main/python/packages/autogen-core/src/autogen_core/tools/_base.py#L138C1-L145C26
This code should format the field value right ? Thanks for reading!

[perfogic]

@ekzhu can you give me a check ? Thanks!

[ekzhu]

I see the problem. We need to update McpToolAdapter to implement return_value_as_string which will then properly format a readable output for the result list.

If you need to apply your own formatting, then we need to include the raw return value in the ToolExecutionEvent message so your app can consume the structured content directly.

[ekzhu]

Created an issue: #6368.

[ekzhu]

More improvement on MCP support will come with this new PR #6340 and subsequently update the output message types.

[perfogic]

Thank you!

[perfogic]

I also created a PR on #6371 @ekzhu. Please give it a check! Thanks!