Type Alias BoxFuture 

pub type BoxFuture = Pin<Box<dyn Future<Output = JsonObject> + Send>>;

The future a ToolHandler returns.

Its own alias because spelling Pin<Box<dyn Future<...> + Send>> at every call site is how one of them ends up without the Send.

Aliased Type

#[repr(transparent)]
pub struct BoxFuture { /* private fields */ }