diff --git a/src/android/io/sentry/SentryCordova.java b/src/android/io/sentry/SentryCordova.java
index 9ae3742..64671d2 100755
--- a/src/android/io/sentry/SentryCordova.java
+++ b/src/android/io/sentry/SentryCordova.java
@@ -81,8 +81,10 @@ public boolean execute(String action, JSONArray args, final CallbackContext call
         try (FileOutputStream out = new FileOutputStream(installation)) {
           out.write(bytes);
           logger.info("Successfully captured envelope.");
+          callbackContext.success();
         } catch (Exception e) {
           logger.info("Error writing envelope.");
+          callbackContext.error("Error writing envelope.");
         }
 
         break;
@@ -369,8 +371,10 @@ private void addBreadcrumb(final JSONObject jsonBreadcrumb, final CallbackContex
 
         scope.addBreadcrumb(breadcrumb);
         logger.info("Send breadcrumb successful");
+        callbackContext.success();
       } catch (JSONException e) {
         logger.warning("Error deserializing breadcrumb");
+        callbackContext.error("Failed to add breadcrumb");
       }
     });
   }
diff --git a/src/ios/SentryCordova.m b/src/ios/SentryCordova.m
index 743af87..ae57170 100755
--- a/src/ios/SentryCordova.m
+++ b/src/ios/SentryCordova.m
@@ -207,12 +207,20 @@ - (void)addBreadcrumb:(CDVInvokedUrlCommand *)command {
 
     [scope addBreadcrumb:breadcrumbInstance];
   }];
+
+  CDVPluginResult *result =
+        [CDVPluginResult resultWithStatus:CDVCommandStatus_OK messageAsBool:YES];
+  [self.commandDelegate sendPluginResult:result callbackId:command.callbackId];
 }
 
 - (void)clearBreadcrumbs:(CDVInvokedUrlCommand *)command {
   [SentrySDK configureScope:^(SentryScope *_Nonnull scope) {
     [scope clearBreadcrumbs];
   }];
+
+  CDVPluginResult *result =
+        [CDVPluginResult resultWithStatus:CDVCommandStatus_OK messageAsBool:YES];
+  [self.commandDelegate sendPluginResult:result callbackId:command.callbackId];
 }
 
 - (void)setUser:(CDVInvokedUrlCommand *)command {
@@ -242,6 +250,10 @@ - (void)setUser:(CDVInvokedUrlCommand *)command {
       [scope setUser:userInstance];
     }
   }];
+
+  CDVPluginResult *result =
+        [CDVPluginResult resultWithStatus:CDVCommandStatus_OK messageAsBool:YES];
+  [self.commandDelegate sendPluginResult:result callbackId:command.callbackId];
 }
 
 - (void)setExtra:(CDVInvokedUrlCommand *)command {
@@ -251,6 +263,10 @@ - (void)setExtra:(CDVInvokedUrlCommand *)command {
   [SentrySDK configureScope:^(SentryScope *_Nonnull scope) {
     [scope setExtraValue:extra forKey:key];
   }];
+
+  CDVPluginResult *result =
+        [CDVPluginResult resultWithStatus:CDVCommandStatus_OK messageAsBool:YES];
+  [self.commandDelegate sendPluginResult:result callbackId:command.callbackId];
 }
 
 - (void)setContext:(CDVInvokedUrlCommand *)command {
@@ -260,6 +276,10 @@ - (void)setContext:(CDVInvokedUrlCommand *)command {
   [SentrySDK configureScope:^(SentryScope *_Nonnull scope) {
     [scope setContextValue:context forKey:key];
   }];
+
+  CDVPluginResult *result =
+        [CDVPluginResult resultWithStatus:CDVCommandStatus_OK messageAsBool:YES];
+  [self.commandDelegate sendPluginResult:result callbackId:command.callbackId];
 }
 
 - (void)setTag:(CDVInvokedUrlCommand *)command {
@@ -269,6 +289,10 @@ - (void)setTag:(CDVInvokedUrlCommand *)command {
   [SentrySDK configureScope:^(SentryScope *_Nonnull scope) {
     [scope setTagValue:value forKey:key];
   }];
+
+  CDVPluginResult *result =
+        [CDVPluginResult resultWithStatus:CDVCommandStatus_OK messageAsBool:YES];
+  [self.commandDelegate sendPluginResult:result callbackId:command.callbackId];
 }
 
 - (void)crash:(CDVInvokedUrlCommand *)command {