A reference to a tool that the user manually attached to their request, either using the #-syntax inline, or as an
attachment via the paperclip button.
Fields
optionalread onlyrange:Null<{start:Int, end:Int}>
The start and end index of the reference in the {@link ChatRequest.prompt prompt}. When undefined, the reference was not part of the prompt text.
Note that the indices take the leading #-character into account which means they can be used to modify the prompt
as-is.