diff --git a/README.md b/README.md
index 934d1a9..14cbd42 100644
--- a/README.md
+++ b/README.md
@@ -214,6 +214,36 @@ response = activitysmith.notifications.send(
 )
 ```
 
+## Rich Push Notifications with Media
+
+<p align="center">
+  <img src="https://cdn.activitysmith.com/features/rich-push-notification-with-image.png" alt="Rich push notification with image" width="680" />
+</p>
+
+```ruby
+response = activitysmith.notifications.send(
+  {
+    title: "Homepage ready",
+    message: "Your agent finished the redesign.",
+    media: "https://cdn.example.com/output/homepage-v2.png",
+    redirection: "https://github.com/acme/web/pull/482"
+  }
+)
+```
+
+Send images, videos, or audio with your push notifications, press and hold to preview media directly from the notification, then tap through to open the linked content.
+
+<p align="center">
+  <img src="https://cdn.activitysmith.com/features/rich-push-notification-with-audio.png" alt="Rich push notification with audio" width="680" />
+</p>
+
+What will work:
+
+- direct image URL: `.jpg`, `.png`, `.gif`, etc.
+- direct audio file URL: `.mp3`, `.m4a`, etc.
+- direct video file URL: `.mp4`, `.mov`, etc.
+- URL that responds with a proper media `Content-Type`, even if the path has no extension
+
 ## Push Notification Redirection and Actions
 
 Push notification redirection and actions are optional and can be used to redirect the user to a specific URL when they tap the notification or to trigger a specific action when they long-press the notification.
diff --git a/lib/activitysmith.rb b/lib/activitysmith.rb
index 085acda..e13ce00 100644
--- a/lib/activitysmith.rb
+++ b/lib/activitysmith.rb
@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 
 require_relative "activitysmith/version"
+require_relative "activitysmith/versioned_user_agent"
 require_relative "activitysmith/notifications"
 require_relative "activitysmith/live_activities"
 require_relative "activitysmith/client"
diff --git a/lib/activitysmith/client.rb b/lib/activitysmith/client.rb
index 24ab8cd..23e9506 100644
--- a/lib/activitysmith/client.rb
+++ b/lib/activitysmith/client.rb
@@ -11,6 +11,7 @@ def initialize(api_key:)
 
       config = OpenapiClient::Configuration.new
       config.access_token = api_key
+      config.user_agent = VersionedUserAgent.value if config.respond_to?(:user_agent=)
 
       api_client = OpenapiClient::ApiClient.new(config)
       @notifications = Notifications.new(OpenapiClient::PushNotificationsApi.new(api_client))
diff --git a/lib/activitysmith/notifications.rb b/lib/activitysmith/notifications.rb
index ec7fa69..f875d68 100644
--- a/lib/activitysmith/notifications.rb
+++ b/lib/activitysmith/notifications.rb
@@ -7,12 +7,16 @@ def initialize(api)
     end
 
     def send(request, opts = {})
-      @api.send_push_notification(normalize_channels_target(request), opts)
+      normalized = normalize_channels_target(request)
+      assert_valid_media_actions!(normalized)
+      @api.send_push_notification(normalized, opts)
     end
 
     # Backward-compatible alias.
     def send_push_notification(push_notification_request, opts = {})
-      @api.send_push_notification(normalize_channels_target(push_notification_request), opts)
+      normalized = normalize_channels_target(push_notification_request)
+      assert_valid_media_actions!(normalized)
+      @api.send_push_notification(normalized, opts)
     end
 
     def method_missing(name, *args, &block)
@@ -49,5 +53,29 @@ def normalize_channels(channels)
         []
       end
     end
+
+    def assert_valid_media_actions!(request)
+      media = request_value(request, :media)
+      actions = request_value(request, :actions)
+      has_media = media.is_a?(String) ? !media.strip.empty? : !media.nil?
+      has_actions = actions.respond_to?(:empty?) ? !actions.empty? : !actions.nil?
+
+      return unless has_media && has_actions
+
+      raise ArgumentError, "ActivitySmith: media cannot be combined with actions"
+    end
+
+    def request_value(request, key)
+      if request.is_a?(Hash)
+        return request[key] if request.key?(key)
+        return request[key.to_s] if request.key?(key.to_s)
+
+        return nil
+      end
+
+      return request.public_send(key) if request.respond_to?(key)
+
+      nil
+    end
   end
 end
diff --git a/lib/activitysmith/versioned_user_agent.rb b/lib/activitysmith/versioned_user_agent.rb
new file mode 100644
index 0000000..ee3cdc6
--- /dev/null
+++ b/lib/activitysmith/versioned_user_agent.rb
@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+module ActivitySmith
+  module VersionedUserAgent
+    def self.value
+      "activitysmith-ruby/#{ActivitySmith::VERSION}"
+    end
+  end
+end
diff --git a/test/resources_test.rb b/test/resources_test.rb
index 0418301..bcfce38 100644
--- a/test/resources_test.rb
+++ b/test/resources_test.rb
@@ -83,6 +83,44 @@ def test_notifications_map_channels_to_target
     )
   end
 
+  def test_notifications_preserve_media_and_redirection
+    api = FakePushApi.new
+    resource = ActivitySmith::Notifications.new(api)
+
+    payload = {
+      title: "Voice Over Generated",
+      media: "https://cdn.activitysmith.com/voice_over.mp3",
+      redirection: "https://studio.acme.com/voice-overs/482/review"
+    }
+
+    resource.send(payload)
+
+    assert_equal(
+      [
+        [:send_push_notification, payload, {}]
+      ],
+      api.calls
+    )
+  end
+
+  def test_notifications_reject_media_and_actions
+    api = FakePushApi.new
+    resource = ActivitySmith::Notifications.new(api)
+
+    error = assert_raises(ArgumentError) do
+      resource.send(
+        {
+          title: "Voice Over Generated",
+          media: "https://cdn.activitysmith.com/voice_over.mp3",
+          actions: [{ title: "Open", type: "open_url", url: "https://example.com" }]
+        }
+      )
+    end
+
+    assert_equal "ActivitySmith: media cannot be combined with actions", error.message
+    assert_empty api.calls
+  end
+
   def test_live_activities_short_and_legacy_methods
     api = FakeLiveApi.new
     resource = ActivitySmith::LiveActivities.new(api)