diff --git a/cmd/release_config/release_config/main.go b/cmd/release_config/release_config/main.go
index 4c8cefc..22e72a5 100644
--- a/cmd/release_config/release_config/main.go
+++ b/cmd/release_config/release_config/main.go
@@ -72,6 +72,11 @@
 	if err != nil {
 		panic(err)
 	}
+
+	if err = config.WritePartitionBuildFlags(outputDir, product, targetRelease); err != nil {
+		panic(err)
+	}
+
 	if allMake {
 		for k, _ := range configs.ReleaseConfigs {
 			makefilePath := filepath.Join(outputDir, fmt.Sprintf("release_config-%s-%s.mk", product, k))
diff --git a/cmd/release_config/release_config_lib/flag_artifact.go b/cmd/release_config/release_config_lib/flag_artifact.go
index d6a629b..cba1b5c 100644
--- a/cmd/release_config/release_config_lib/flag_artifact.go
+++ b/cmd/release_config/release_config_lib/flag_artifact.go
@@ -129,3 +129,14 @@
 		Traces:          fa.Traces,
 	}, nil
 }
+
+// Marshal the FlagArtifact without Traces.
+func (fa *FlagArtifact) MarshalWithoutTraces() (*rc_proto.FlagArtifact, error) {
+	if fa.Redacted {
+		return nil, nil
+	}
+	return &rc_proto.FlagArtifact{
+		FlagDeclaration: fa.FlagDeclaration,
+		Value:           fa.Value,
+	}, nil
+}
diff --git a/cmd/release_config/release_config_lib/release_config.go b/cmd/release_config/release_config_lib/release_config.go
index 079f6b5..a7a05ae 100644
--- a/cmd/release_config/release_config_lib/release_config.go
+++ b/cmd/release_config/release_config_lib/release_config.go
@@ -15,7 +15,10 @@
 package release_config_lib
 
 import (
+	"cmp"
 	"fmt"
+	"path/filepath"
+	"slices"
 	"sort"
 	"strings"
 
@@ -67,6 +70,9 @@
 
 	// We have begun compiling this release config.
 	compileInProgress bool
+
+	// Partitioned artifacts for {partition}/etc/build_flags.json
+	PartitionBuildFlags map[string]*rc_proto.FlagArtifacts
 }
 
 func ReleaseConfigFactory(name string, index int) (c *ReleaseConfig) {
@@ -206,6 +212,34 @@
 		}
 	}
 
+	// Now build the per-partition artifacts
+	config.PartitionBuildFlags = make(map[string]*rc_proto.FlagArtifacts)
+	addPartitionArtifact := func(container string, artifact *rc_proto.FlagArtifact) {
+		if _, ok := config.PartitionBuildFlags[container]; !ok {
+			config.PartitionBuildFlags[container] = &rc_proto.FlagArtifacts{}
+		}
+		config.PartitionBuildFlags[container].FlagArtifacts = append(config.PartitionBuildFlags[container].FlagArtifacts, artifact)
+	}
+	for _, v := range config.FlagArtifacts {
+		container := strings.ToLower(rc_proto.Container_name[int32(v.FlagDeclaration.GetContainer())])
+		artifact, err := v.MarshalWithoutTraces()
+		if err != nil {
+			return err
+		}
+		switch container {
+		case "all":
+			for cVal, cName := range rc_proto.Container_name {
+				// Skip unspecified, and "ALL", but place the flag in the rest.
+				if cVal == 0 || cName == "ALL" {
+					continue
+				}
+				cName = strings.ToLower(cName)
+				addPartitionArtifact(cName, artifact)
+			}
+		default:
+			addPartitionArtifact(container, artifact)
+		}
+	}
 	config.ReleaseConfigArtifact = &rc_proto.ReleaseConfigArtifact{
 		Name:       proto.String(config.Name),
 		OtherNames: config.OtherNames,
@@ -234,3 +268,16 @@
 	config.compileInProgress = false
 	return nil
 }
+
+func (config *ReleaseConfig) WritePartitionBuildFlags(outDir, product, targetRelease string) error {
+	var err error
+	for partition, flags := range config.PartitionBuildFlags {
+		slices.SortFunc(flags.FlagArtifacts, func(a, b *rc_proto.FlagArtifact) int {
+			return cmp.Compare(*a.FlagDeclaration.Name, *b.FlagDeclaration.Name)
+		})
+		if err = WriteMessage(filepath.Join(outDir, fmt.Sprintf("build_flags_%s-%s-%s.json", partition, config.Name, product)), flags); err != nil {
+			return err
+		}
+	}
+	return nil
+}
diff --git a/cmd/release_config/release_config_proto/build_flags_out.pb.go b/cmd/release_config/release_config_proto/build_flags_out.pb.go
index 77e2069..483cffa 100644
--- a/cmd/release_config/release_config_proto/build_flags_out.pb.go
+++ b/cmd/release_config/release_config_proto/build_flags_out.pb.go
@@ -153,6 +153,54 @@
 	return nil
 }
 
+type FlagArtifacts struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// The artifacts
+	FlagArtifacts []*FlagArtifact `protobuf:"bytes,1,rep,name=flag_artifacts,json=flagArtifacts" json:"flag_artifacts,omitempty"`
+}
+
+func (x *FlagArtifacts) Reset() {
+	*x = FlagArtifacts{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_build_flags_out_proto_msgTypes[2]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *FlagArtifacts) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*FlagArtifacts) ProtoMessage() {}
+
+func (x *FlagArtifacts) ProtoReflect() protoreflect.Message {
+	mi := &file_build_flags_out_proto_msgTypes[2]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use FlagArtifacts.ProtoReflect.Descriptor instead.
+func (*FlagArtifacts) Descriptor() ([]byte, []int) {
+	return file_build_flags_out_proto_rawDescGZIP(), []int{2}
+}
+
+func (x *FlagArtifacts) GetFlagArtifacts() []*FlagArtifact {
+	if x != nil {
+		return x.FlagArtifacts
+	}
+	return nil
+}
+
 type ReleaseConfigArtifact struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -179,7 +227,7 @@
 func (x *ReleaseConfigArtifact) Reset() {
 	*x = ReleaseConfigArtifact{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_build_flags_out_proto_msgTypes[2]
+		mi := &file_build_flags_out_proto_msgTypes[3]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -192,7 +240,7 @@
 func (*ReleaseConfigArtifact) ProtoMessage() {}
 
 func (x *ReleaseConfigArtifact) ProtoReflect() protoreflect.Message {
-	mi := &file_build_flags_out_proto_msgTypes[2]
+	mi := &file_build_flags_out_proto_msgTypes[3]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -205,7 +253,7 @@
 
 // Deprecated: Use ReleaseConfigArtifact.ProtoReflect.Descriptor instead.
 func (*ReleaseConfigArtifact) Descriptor() ([]byte, []int) {
-	return file_build_flags_out_proto_rawDescGZIP(), []int{2}
+	return file_build_flags_out_proto_rawDescGZIP(), []int{3}
 }
 
 func (x *ReleaseConfigArtifact) GetName() string {
@@ -266,7 +314,7 @@
 func (x *ReleaseConfigsArtifact) Reset() {
 	*x = ReleaseConfigsArtifact{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_build_flags_out_proto_msgTypes[3]
+		mi := &file_build_flags_out_proto_msgTypes[4]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -279,7 +327,7 @@
 func (*ReleaseConfigsArtifact) ProtoMessage() {}
 
 func (x *ReleaseConfigsArtifact) ProtoReflect() protoreflect.Message {
-	mi := &file_build_flags_out_proto_msgTypes[3]
+	mi := &file_build_flags_out_proto_msgTypes[4]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -292,7 +340,7 @@
 
 // Deprecated: Use ReleaseConfigsArtifact.ProtoReflect.Descriptor instead.
 func (*ReleaseConfigsArtifact) Descriptor() ([]byte, []int) {
-	return file_build_flags_out_proto_rawDescGZIP(), []int{3}
+	return file_build_flags_out_proto_rawDescGZIP(), []int{4}
 }
 
 func (x *ReleaseConfigsArtifact) GetReleaseConfig() *ReleaseConfigArtifact {
@@ -344,58 +392,64 @@
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+	0x6e, 0x64, 0x72, 0x6f, 0x69, 0x64, 0x2f, 0x73, 0x6f, 0x6f, 0x6e, 0x67, 0x2f, 0x72, 0x65, 0x6c,
+	0x65, 0x61, 0x73, 0x65, 0x5f, 0x63, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x2f, 0x72, 0x65, 0x6c, 0x65,
+	0x61, 0x73, 0x65, 0x5f, 0x63, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x5f, 0x70, 0x72, 0x6f, 0x74, 0x6f,
 }
 
 var (
@@ -410,32 +464,34 @@
 	return file_build_flags_out_proto_rawDescData
 }
 
-var file_build_flags_out_proto_msgTypes = make([]protoimpl.MessageInfo, 5)
+var file_build_flags_out_proto_msgTypes = make([]protoimpl.MessageInfo, 6)
 var file_build_flags_out_proto_goTypes = []interface{}{
 	(*Tracepoint)(nil),             // 0: android.release_config_proto.tracepoint
 	(*FlagArtifact)(nil),           // 1: android.release_config_proto.flag_artifact
-	(*ReleaseConfigArtifact)(nil),  // 2: android.release_config_proto.release_config_artifact
-	(*ReleaseConfigsArtifact)(nil), // 3: android.release_config_proto.release_configs_artifact
-	nil,                            // 4: android.release_config_proto.release_configs_artifact.ReleaseConfigMapsMapEntry
-	(*Value)(nil),                  // 5: android.release_config_proto.value
-	(*FlagDeclaration)(nil),        // 6: android.release_config_proto.flag_declaration
-	(*ReleaseConfigMap)(nil),       // 7: android.release_config_proto.release_config_map
+	(*FlagArtifacts)(nil),          // 2: android.release_config_proto.flag_artifacts
+	(*ReleaseConfigArtifact)(nil),  // 3: android.release_config_proto.release_config_artifact
+	(*ReleaseConfigsArtifact)(nil), // 4: android.release_config_proto.release_configs_artifact
+	nil,                            // 5: android.release_config_proto.release_configs_artifact.ReleaseConfigMapsMapEntry
+	(*Value)(nil),                  // 6: android.release_config_proto.value
+	(*FlagDeclaration)(nil),        // 7: android.release_config_proto.flag_declaration
+	(*ReleaseConfigMap)(nil),       // 8: android.release_config_proto.release_config_map
 }
 var file_build_flags_out_proto_depIdxs = []int32{
-	5, // 0: android.release_config_proto.tracepoint.value:type_name -> android.release_config_proto.value
-	6, // 1: android.release_config_proto.flag_artifact.flag_declaration:type_name -> android.release_config_proto.flag_declaration
-	5, // 2: android.release_config_proto.flag_artifact.value:type_name -> android.release_config_proto.value
-	0, // 3: android.release_config_proto.flag_artifact.traces:type_name -> android.release_config_proto.tracepoint
-	1, // 4: android.release_config_proto.release_config_artifact.flag_artifacts:type_name -> android.release_config_proto.flag_artifact
-	2, // 5: android.release_config_proto.release_configs_artifact.release_config:type_name -> android.release_config_proto.release_config_artifact
-	2, // 6: android.release_config_proto.release_configs_artifact.other_release_configs:type_name -> android.release_config_proto.release_config_artifact
-	4, // 7: android.release_config_proto.release_configs_artifact.release_config_maps_map:type_name -> android.release_config_proto.release_configs_artifact.ReleaseConfigMapsMapEntry
-	7, // 8: android.release_config_proto.release_configs_artifact.ReleaseConfigMapsMapEntry.value:type_name -> android.release_config_proto.release_config_map
-	9, // [9:9] is the sub-list for method output_type
-	9, // [9:9] is the sub-list for method input_type
-	9, // [9:9] is the sub-list for extension type_name
-	9, // [9:9] is the sub-list for extension extendee
-	0, // [0:9] is the sub-list for field type_name
+	6,  // 0: android.release_config_proto.tracepoint.value:type_name -> android.release_config_proto.value
+	7,  // 1: android.release_config_proto.flag_artifact.flag_declaration:type_name -> android.release_config_proto.flag_declaration
+	6,  // 2: android.release_config_proto.flag_artifact.value:type_name -> android.release_config_proto.value
+	0,  // 3: android.release_config_proto.flag_artifact.traces:type_name -> android.release_config_proto.tracepoint
+	1,  // 4: android.release_config_proto.flag_artifacts.flag_artifacts:type_name -> android.release_config_proto.flag_artifact
+	1,  // 5: android.release_config_proto.release_config_artifact.flag_artifacts:type_name -> android.release_config_proto.flag_artifact
+	3,  // 6: android.release_config_proto.release_configs_artifact.release_config:type_name -> android.release_config_proto.release_config_artifact
+	3,  // 7: android.release_config_proto.release_configs_artifact.other_release_configs:type_name -> android.release_config_proto.release_config_artifact
+	5,  // 8: android.release_config_proto.release_configs_artifact.release_config_maps_map:type_name -> android.release_config_proto.release_configs_artifact.ReleaseConfigMapsMapEntry
+	8,  // 9: android.release_config_proto.release_configs_artifact.ReleaseConfigMapsMapEntry.value:type_name -> android.release_config_proto.release_config_map
+	10, // [10:10] is the sub-list for method output_type
+	10, // [10:10] is the sub-list for method input_type
+	10, // [10:10] is the sub-list for extension type_name
+	10, // [10:10] is the sub-list for extension extendee
+	0,  // [0:10] is the sub-list for field type_name
 }
 
 func init() { file_build_flags_out_proto_init() }
@@ -470,7 +526,7 @@
 			}
 		}
 		file_build_flags_out_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ReleaseConfigArtifact); i {
+			switch v := v.(*FlagArtifacts); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -482,6 +538,18 @@
 			}
 		}
 		file_build_flags_out_proto_msgTypes[3].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ReleaseConfigArtifact); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_build_flags_out_proto_msgTypes[4].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*ReleaseConfigsArtifact); i {
 			case 0:
 				return &v.state
@@ -500,7 +568,7 @@
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_build_flags_out_proto_rawDesc,
 			NumEnums:      0,
-			NumMessages:   5,
+			NumMessages:   6,
 			NumExtensions: 0,
 			NumServices:   0,
 		},
diff --git a/cmd/release_config/release_config_proto/build_flags_out.proto b/cmd/release_config/release_config_proto/build_flags_out.proto
index 05e770f..6f34d6f 100644
--- a/cmd/release_config/release_config_proto/build_flags_out.proto
+++ b/cmd/release_config/release_config_proto/build_flags_out.proto
@@ -52,6 +52,11 @@
   repeated tracepoint traces = 8;
 }
 
+message flag_artifacts {
+  // The artifacts
+  repeated flag_artifact flag_artifacts = 1;
+}
+
 message release_config_artifact {
   // The name of the release config.
   // See # name for format detail