Function execute_to_completion 

pub async fn execute_to_completion(
    stream: ToolOutputStream,
    on_preliminary: impl FnMut(JsonValue),
) -> Result<JsonValue, ToolError>

Drives an output stream to its end, forwarding preliminary values to on_preliminary and returning the final value.

Errors

Returns the first error produced by the stream, or a ToolError::Message when the stream ends without a final output.