Values.SpanMessageValueMessage content value - can be text, tool invocation, tool result, or reasoning
type nonrec t = {text : SpanTextValue.t option;Text message content
*)toolUse : SpanToolUseValue.t option;Tool invocation message content
*)toolResult : SpanToolResultValue.t option;Tool result message content
*)reasoning : SpanReasoningValue.t option;}val make :
?text:SpanTextValue.t ->
?toolUse:SpanToolUseValue.t ->
?toolResult:SpanToolResultValue.t ->
?reasoning:SpanReasoningValue.t ->
unit ->
t