diff --git a/tools/systemfeatures/Android.bp b/tools/systemfeatures/Android.bp
index e6d0a3d..2ebede3 100644
--- a/tools/systemfeatures/Android.bp
+++ b/tools/systemfeatures/Android.bp
@@ -13,6 +13,7 @@
     srcs: [
         "src/**/*.java",
         "src/**/*.kt",
+        ":framework-metalava-annotations",
     ],
     static_libs: [
         "guava",
@@ -26,6 +27,12 @@
     static_libs: ["systemfeatures-gen-lib"],
 }
 
+java_plugin {
+    name: "systemfeatures-metadata-processor",
+    processor_class: "com.android.systemfeatures.SystemFeaturesMetadataProcessor",
+    static_libs: ["systemfeatures-gen-lib"],
+}
+
 genrule {
     name: "systemfeatures-gen-tests-srcs",
     cmd: "$(location systemfeatures-gen-tool) com.android.systemfeatures.RwNoFeatures --readonly=false > $(location RwNoFeatures.java) && " +
@@ -61,6 +68,7 @@
         "systemfeatures-gen-lib",
         "truth",
     ],
+    plugins: ["systemfeatures-metadata-processor"],
 }
 
 // Rename the goldens as they may be copied into the source tree, and we don't
diff --git a/tools/systemfeatures/src/com/android/systemfeatures/SystemFeaturesMetadataProcessor.kt b/tools/systemfeatures/src/com/android/systemfeatures/SystemFeaturesMetadataProcessor.kt
new file mode 100644
index 0000000..100d869
--- /dev/null
+++ b/tools/systemfeatures/src/com/android/systemfeatures/SystemFeaturesMetadataProcessor.kt
@@ -0,0 +1,110 @@
+/*
+ * Copyright (C) 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.systemfeatures
+
+import android.annotation.SdkConstant
+import com.squareup.javapoet.FieldSpec
+import com.squareup.javapoet.JavaFile
+import com.squareup.javapoet.TypeSpec
+import java.io.IOException
+import javax.annotation.processing.AbstractProcessor
+import javax.annotation.processing.ProcessingEnvironment
+import javax.annotation.processing.RoundEnvironment
+import javax.lang.model.SourceVersion
+import javax.lang.model.element.Modifier
+import javax.lang.model.element.TypeElement
+import javax.tools.Diagnostic
+
+/*
+ * Simple Java code generator for computing metadata for system features.
+ *
+ * <p>The output is a single class file, `com.android.internal.pm.SystemFeaturesMetadata`, with
+ * properties computed from feature constant definitions in the PackageManager class. This
+ * class is only produced if the processed environment includes PackageManager; all other
+ * invocations are ignored.
+ */
+class SystemFeaturesMetadataProcessor : AbstractProcessor() {
+
+    private lateinit var packageManagerType: TypeElement
+
+    override fun getSupportedSourceVersion(): SourceVersion = SourceVersion.latestSupported()
+
+    override fun getSupportedAnnotationTypes() = setOf(SDK_CONSTANT_ANNOTATION_NAME)
+
+    override fun init(processingEnv: ProcessingEnvironment) {
+        super.init(processingEnv)
+        packageManagerType =
+            processingEnv.elementUtils.getTypeElement("android.content.pm.PackageManager")!!
+    }
+
+    override fun process(annotations: Set<TypeElement>, roundEnv: RoundEnvironment): Boolean {
+        if (roundEnv.processingOver()) {
+            return false
+        }
+
+        // We're only interested in feature constants defined in PackageManager.
+        var featureCount = 0
+        roundEnv.getElementsAnnotatedWith(SdkConstant::class.java).forEach {
+            if (
+                it.enclosingElement == packageManagerType &&
+                    it.getAnnotation(SdkConstant::class.java).value ==
+                        SdkConstant.SdkConstantType.FEATURE
+            ) {
+                featureCount++
+            }
+        }
+
+        if (featureCount == 0) {
+            // This is fine, and happens for any environment that doesn't include PackageManager.
+            return false
+        }
+
+        val systemFeatureMetadata =
+            TypeSpec.classBuilder("SystemFeaturesMetadata")
+                .addModifiers(Modifier.PUBLIC, Modifier.FINAL)
+                .addJavadoc("@hide")
+                .addField(
+                    FieldSpec.builder(Int::class.java, "SDK_FEATURE_COUNT")
+                        .addModifiers(Modifier.PUBLIC, Modifier.STATIC, Modifier.FINAL)
+                        .addJavadoc(
+                            "The number of `@SdkConstant` features defined in PackageManager."
+                        )
+                        .addJavadoc("@hide")
+                        .initializer("\$L", featureCount)
+                        .build()
+                )
+                .build()
+
+        try {
+            JavaFile.builder("com.android.internal.pm", systemFeatureMetadata)
+                .skipJavaLangImports(true)
+                .build()
+                .writeTo(processingEnv.filer)
+        } catch (e: IOException) {
+            processingEnv.messager.printMessage(
+                Diagnostic.Kind.ERROR,
+                "Failed to write file: ${e.message}",
+            )
+        }
+
+        return true
+    }
+
+    companion object {
+        private val SDK_CONSTANT_ANNOTATION_NAME = SdkConstant::class.qualifiedName
+    }
+}
diff --git a/tools/systemfeatures/tests/src/PackageManager.java b/tools/systemfeatures/tests/src/PackageManager.java
index db67048..839a937 100644
--- a/tools/systemfeatures/tests/src/PackageManager.java
+++ b/tools/systemfeatures/tests/src/PackageManager.java
@@ -16,14 +16,33 @@
 
 package android.content.pm;
 
+import android.annotation.SdkConstant;
+import android.annotation.SdkConstant.SdkConstantType;
+
 /** Stub for testing */
 public class PackageManager {
+    @SdkConstant(SdkConstantType.FEATURE)
     public static final String FEATURE_AUTO = "automotive";
+
+    @SdkConstant(SdkConstantType.FEATURE)
     public static final String FEATURE_PC = "pc";
+
+    @SdkConstant(SdkConstantType.FEATURE)
     public static final String FEATURE_VULKAN = "vulkan";
+
+    @SdkConstant(SdkConstantType.FEATURE)
     public static final String FEATURE_WATCH = "watch";
+
+    @SdkConstant(SdkConstantType.FEATURE)
     public static final String FEATURE_WIFI = "wifi";
 
+    @SdkConstant(SdkConstantType.INTENT_CATEGORY)
+    public static final String FEATURE_INTENT_CATEGORY = "intent_category_with_feature_name_prefix";
+
+    public static final String FEATURE_NOT_ANNOTATED = "not_annotated";
+
+    public static final String NOT_FEATURE = "not_feature";
+
     /** @hide */
     public boolean hasSystemFeature(String featureName, int version) {
         return false;
diff --git a/tools/systemfeatures/tests/src/SystemFeaturesMetadataProcessorTest.java b/tools/systemfeatures/tests/src/SystemFeaturesMetadataProcessorTest.java
new file mode 100644
index 0000000..4ffb5b9
--- /dev/null
+++ b/tools/systemfeatures/tests/src/SystemFeaturesMetadataProcessorTest.java
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.systemfeatures;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import com.android.internal.pm.SystemFeaturesMetadata;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+@RunWith(JUnit4.class)
+public class SystemFeaturesMetadataProcessorTest {
+
+    @Test
+    public void testSdkFeatureCount() {
+        // See the fake PackageManager definition in this directory.
+        // It defines 5 annotated features, and any/all other constants should be ignored.
+        assertThat(SystemFeaturesMetadata.SDK_FEATURE_COUNT).isEqualTo(5);
+    }
+}