diff --git a/tools/aconfig/src/codegen_java.rs b/tools/aconfig/src/codegen_java.rs
index c4fc405..43c2ecf 100644
--- a/tools/aconfig/src/codegen_java.rs
+++ b/tools/aconfig/src/codegen_java.rs
@@ -118,21 +118,30 @@
 
     const EXPECTED_FEATUREFLAGS_COMMON_CONTENT: &str = r#"
     package com.android.aconfig.test;
+    // TODO(b/303773055): Remove the annotation after access issue is resolved.
+    import android.compat.annotation.UnsupportedAppUsage;
     /** @hide */
     public interface FeatureFlags {
         @com.android.aconfig.annotations.AssumeFalseForR8
+        @UnsupportedAppUsage
         boolean disabledRo();
+        @UnsupportedAppUsage
         boolean disabledRw();
         @com.android.aconfig.annotations.AssumeTrueForR8
+        @UnsupportedAppUsage
         boolean enabledFixedRo();
         @com.android.aconfig.annotations.AssumeTrueForR8
+        @UnsupportedAppUsage
         boolean enabledRo();
+        @UnsupportedAppUsage
         boolean enabledRw();
     }
     "#;
 
     const EXPECTED_FLAG_COMMON_CONTENT: &str = r#"
     package com.android.aconfig.test;
+    // TODO(b/303773055): Remove the annotation after access issue is resolved.
+    import android.compat.annotation.UnsupportedAppUsage;
     /** @hide */
     public final class Flags {
         /** @hide */
@@ -147,20 +156,25 @@
         public static final String FLAG_ENABLED_RW = "com.android.aconfig.test.enabled_rw";
 
         @com.android.aconfig.annotations.AssumeFalseForR8
+        @UnsupportedAppUsage
         public static boolean disabledRo() {
             return FEATURE_FLAGS.disabledRo();
         }
+        @UnsupportedAppUsage
         public static boolean disabledRw() {
             return FEATURE_FLAGS.disabledRw();
         }
         @com.android.aconfig.annotations.AssumeTrueForR8
+        @UnsupportedAppUsage
         public static boolean enabledFixedRo() {
             return FEATURE_FLAGS.enabledFixedRo();
         }
         @com.android.aconfig.annotations.AssumeTrueForR8
+        @UnsupportedAppUsage
         public static boolean enabledRo() {
             return FEATURE_FLAGS.enabledRo();
         }
+        @UnsupportedAppUsage
         public static boolean enabledRw() {
             return FEATURE_FLAGS.enabledRw();
         }
@@ -168,6 +182,8 @@
 
     const EXPECTED_FAKEFEATUREFLAGSIMPL_CONTENT: &str = r#"
     package com.android.aconfig.test;
+    // TODO(b/303773055): Remove the annotation after access issue is resolved.
+    import android.compat.annotation.UnsupportedAppUsage;
     import java.util.HashMap;
     import java.util.Map;
     /** @hide */
@@ -176,22 +192,27 @@
             resetAll();
         }
         @Override
+        @UnsupportedAppUsage
         public boolean disabledRo() {
             return getValue(Flags.FLAG_DISABLED_RO);
         }
         @Override
+        @UnsupportedAppUsage
         public boolean disabledRw() {
             return getValue(Flags.FLAG_DISABLED_RW);
         }
         @Override
+        @UnsupportedAppUsage
         public boolean enabledFixedRo() {
             return getValue(Flags.FLAG_ENABLED_FIXED_RO);
         }
         @Override
+        @UnsupportedAppUsage
         public boolean enabledRo() {
             return getValue(Flags.FLAG_ENABLED_RO);
         }
         @Override
+        @UnsupportedAppUsage
         public boolean enabledRw() {
             return getValue(Flags.FLAG_ENABLED_RW);
         }
@@ -241,14 +262,18 @@
 
         let expect_featureflagsimpl_content = r#"
         package com.android.aconfig.test;
+        // TODO(b/303773055): Remove the annotation after access issue is resolved.
+        import android.compat.annotation.UnsupportedAppUsage;
         import android.provider.DeviceConfig;
         /** @hide */
         public final class FeatureFlagsImpl implements FeatureFlags {
             @Override
+            @UnsupportedAppUsage
             public boolean disabledRo() {
                 return false;
             }
             @Override
+            @UnsupportedAppUsage
             public boolean disabledRw() {
                 return getValue(
                     "aconfig_test",
@@ -257,14 +282,17 @@
                 );
             }
             @Override
+            @UnsupportedAppUsage
             public boolean enabledFixedRo() {
                 return true;
             }
             @Override
+            @UnsupportedAppUsage
             public boolean enabledRo() {
                 return true;
             }
             @Override
+            @UnsupportedAppUsage
             public boolean enabledRw() {
                 return getValue(
                     "aconfig_test",
@@ -346,29 +374,36 @@
         "#;
         let expect_featureflagsimpl_content = r#"
         package com.android.aconfig.test;
+        // TODO(b/303773055): Remove the annotation after access issue is resolved.
+        import android.compat.annotation.UnsupportedAppUsage;
         /** @hide */
         public final class FeatureFlagsImpl implements FeatureFlags {
             @Override
+            @UnsupportedAppUsage
             public boolean disabledRo() {
                 throw new UnsupportedOperationException(
                     "Method is not implemented.");
             }
             @Override
+            @UnsupportedAppUsage
             public boolean disabledRw() {
                 throw new UnsupportedOperationException(
                     "Method is not implemented.");
             }
             @Override
+            @UnsupportedAppUsage
             public boolean enabledFixedRo() {
                 throw new UnsupportedOperationException(
                     "Method is not implemented.");
             }
             @Override
+            @UnsupportedAppUsage
             public boolean enabledRo() {
                 throw new UnsupportedOperationException(
                     "Method is not implemented.");
             }
             @Override
+            @UnsupportedAppUsage
             public boolean enabledRw() {
                 throw new UnsupportedOperationException(
                     "Method is not implemented.");
diff --git a/tools/aconfig/templates/FakeFeatureFlagsImpl.java.template b/tools/aconfig/templates/FakeFeatureFlagsImpl.java.template
index d2cea95..72a896f 100644
--- a/tools/aconfig/templates/FakeFeatureFlagsImpl.java.template
+++ b/tools/aconfig/templates/FakeFeatureFlagsImpl.java.template
@@ -1,4 +1,6 @@
 package {package_name};
+// TODO(b/303773055): Remove the annotation after access issue is resolved.
+import android.compat.annotation.UnsupportedAppUsage;
 
 import java.util.HashMap;
 import java.util.Map;
@@ -11,6 +13,7 @@
 
 {{ for item in class_elements}}
     @Override
+    @UnsupportedAppUsage
     public boolean {item.method_name}() \{
         return getValue(Flags.FLAG_{item.flag_name_constant_suffix});
     }
diff --git a/tools/aconfig/templates/FeatureFlags.java.template b/tools/aconfig/templates/FeatureFlags.java.template
index 9350d60..02305e6 100644
--- a/tools/aconfig/templates/FeatureFlags.java.template
+++ b/tools/aconfig/templates/FeatureFlags.java.template
@@ -1,4 +1,6 @@
 package {package_name};
+// TODO(b/303773055): Remove the annotation after access issue is resolved.
+import android.compat.annotation.UnsupportedAppUsage;
 
 /** @hide */
 public interface FeatureFlags \{
@@ -10,6 +12,7 @@
     @com.android.aconfig.annotations.AssumeFalseForR8
 {{ -endif- }}
 {{ endif }}
+    @UnsupportedAppUsage
     boolean {item.method_name}();
 {{ endfor }}
 }
diff --git a/tools/aconfig/templates/FeatureFlagsImpl.java.template b/tools/aconfig/templates/FeatureFlagsImpl.java.template
index 3913fa4..1620dfe 100644
--- a/tools/aconfig/templates/FeatureFlagsImpl.java.template
+++ b/tools/aconfig/templates/FeatureFlagsImpl.java.template
@@ -1,4 +1,6 @@
 package {package_name};
+// TODO(b/303773055): Remove the annotation after access issue is resolved.
+import android.compat.annotation.UnsupportedAppUsage;
 {{ if not is_test_mode }}
 {{ if is_read_write- }}
 import android.provider.DeviceConfig;
@@ -7,6 +9,7 @@
 public final class FeatureFlagsImpl implements FeatureFlags \{
 {{ for item in class_elements}}
     @Override
+    @UnsupportedAppUsage
     public boolean {item.method_name}() \{
     {{ -if item.is_read_write }}
         return getValue(
@@ -49,6 +52,7 @@
 public final class FeatureFlagsImpl implements FeatureFlags \{
 {{ for item in class_elements}}
     @Override
+    @UnsupportedAppUsage
     public boolean {item.method_name}() \{
         throw new UnsupportedOperationException(
             "Method is not implemented.");
diff --git a/tools/aconfig/templates/Flags.java.template b/tools/aconfig/templates/Flags.java.template
index 39024a8..66c4c5a 100644
--- a/tools/aconfig/templates/Flags.java.template
+++ b/tools/aconfig/templates/Flags.java.template
@@ -1,5 +1,8 @@
 package {package_name};
 
+// TODO(b/303773055): Remove the annotation after access issue is resolved.
+import android.compat.annotation.UnsupportedAppUsage;
+
 /** @hide */
 public final class Flags \{
 {{- for item in class_elements}}
@@ -14,6 +17,7 @@
     @com.android.aconfig.annotations.AssumeFalseForR8
 {{ -endif- }}
 {{ endif }}
+    @UnsupportedAppUsage
     public static boolean {item.method_name}() \{
         return FEATURE_FLAGS.{item.method_name}();
     }