feat: add message to ProgressNotification (#119)

Author: xhdd123321

examples/everything/main.go

@@ -369,6 +369,7 @@ func handleLongRunningOperationTool(
 					"progress":      i,
 					"total":         int(steps),
 					"progressToken": progressToken,
+					"message":       fmt.Sprintf("Server progress %v%%", int(float64(i)*100/steps)),
 				},
 			)
 		}

mcp/types.go

@@ -371,6 +371,9 @@ type ProgressNotification struct {
 		Progress float64 `json:"progress"`
 		// Total number of items to process (or total progress required), if known.
 		Total float64 `json:"total,omitempty"`
+		// Message related to progress. This should provide relevant human-readable
+		// progress information.
+		Message string `json:"message,omitempty"`
 	} `json:"params"`
 }
 

mcp/utils.go

@@ -130,6 +130,7 @@ func NewProgressNotification(
 	token ProgressToken,
 	progress float64,
 	total *float64,
+	message *string,
 ) ProgressNotification {
 	notification := ProgressNotification{
 		Notification: Notification{
@@ -139,6 +140,7 @@ func NewProgressNotification(
 			ProgressToken ProgressToken `json:"progressToken"`
 			Progress      float64       `json:"progress"`
 			Total         float64       `json:"total,omitempty"`
+			Message       string        `json:"message,omitempty"`
 		}{
 			ProgressToken: token,
 			Progress:      progress,
@@ -147,6 +149,9 @@ func NewProgressNotification(
 	if total != nil {
 		notification.Params.Total = *total
 	}
+	if message != nil {
+		notification.Params.Message = *message
+	}
 	return notification
 }