Provide MCP Server Name and Title

[Whadup]

Description

When we connect to an MCP Server, the server responds with its name and title.
I'd like to have these available.

E.g. in

pydantic-ai/pydantic_ai_slim/pydantic_ai/mcp.py

Line 301 in bf03ed6

await self._client.initialize()

we could store it in two new fields.

with anyio.fail_after(self.timeout):
    init_result = await self._client.initialize()
    self.name = init_result.serverInfo.name
    self.title = init_result.serverInfo.title
    if log_level := self.log_level:
        await self._client.set_logging_level(log_level)

References

https://modelcontextprotocol.io/specification/2025-03-26/basic/lifecycle

[DouweM]

@Whadup What do you think of an MCPServer.server_info property that stores the entire Implementation object on init_result.serverInfo?

It's not guaranteed to have either the name or title fields:

https://github.com/modelcontextprotocol/python-sdk/blob/c81ff64e94469c841010c1fef43cb298c6dc78d3/src/mcp/types.py#L231-L242

The implementation would be similar to #3020 to make it clear it's only available during a connection.

[Whadup]

Sounds perfect. While it's not guaranteed, if it is available it is certainly interesting for UI components =)

[DouweM]

@Whadup Would you be up for submitting a PR? :)