use InputPeerUser by custom username to 'user[%d]'

internal/tg/draft.go

@@ -35,12 +35,12 @@ func (c *Client) SendDraft(args DraftArguments) (*mcp.ToolResponse, error) {
 			Message: args.Text,
 		})
 		if err != nil {
-			return fmt.Errorf("failed to get history: %w", err)
+			return fmt.Errorf("failed to send draft: %w", err)
 		}
 
 		return nil
 	}); err != nil {
-		return nil, errors.Wrap(err, "failed to get history")
+		return nil, errors.Wrap(err, "failed to send draft")
 	}
 
 	jsonData, err := json.Marshal(DraftResponse{Success: ok})

internal/tg/helpers.go

@@ -30,7 +30,7 @@ func getUsername(source any) string {
 	var username string
 	switch u := source.(type) {
 	case *tg.User:
-		username = u.Username
+		username = fmt.Sprintf("user[%d]", u.ID)
 	case *tg.Chat:
 		username = fmt.Sprintf("cht[%d]", u.ID)
 	case *tg.Channel:

internal/tg/history.go

@@ -89,6 +89,14 @@ func getInputPeerFromName(ctx context.Context, api *tg.Client, name string) (tg.
 		}
 
 		return &chatPeer, nil
+	case strings.HasPrefix(name, "user") && isCustom:
+		var userPeer tg.InputPeerUser
+		_, err := fmt.Sscanf(name, "user[%d]", &userPeer.UserID)
+		if err != nil {
+			return nil, errors.Wrapf(err, "scan user peer(%q)", name)
+		}
+
+		return &userPeer, nil
 	default:
 		sender := message.NewSender(api)
 		inputPeer, err := sender.Resolve(name).AsInputPeer(ctx)