Proper return-type annotation for ToolResult?

[craigds]

I have a tool that returns both text content and structured content, so I'm using ToolResult.

• Using -> ToolResult as my return type annotation causes the outputSchema to disappear, fair enough.
• Using the type of my structured_content as the return type annotation makes the outputSchema come back, although this seems wrong because I'm actually returning a ToolResult, and I can't see why my linter's not complaining (it may be misconfigured?)

Is there a better way? I tried -> ToolResult[ActualStructuredContentType] but it doesn't seem to be genericizable.