diff --git a/build/bazel/remote/execution/v2/remote_execution.pb.go b/build/bazel/remote/execution/v2/remote_execution.pb.go
index f29ad049..b97f0c82 100755
--- a/build/bazel/remote/execution/v2/remote_execution.pb.go
+++ b/build/bazel/remote/execution/v2/remote_execution.pb.go
@@ -4342,8 +4342,8 @@ type RequestMetadata struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	// The details for the tool invoking the requests.
-	ToolDetails *ToolDetails `protobuf:"bytes,1,opt,name=tool_details,json=toolDetails,proto3" json:"tool_details,omitempty"`
+	// The details for the tools involved in sending the requests.
+	ToolDetails []*ToolDetails `protobuf:"bytes,1,rep,name=tool_details,json=toolDetails,proto3" json:"tool_details,omitempty"`
 	// An identifier that ties multiple requests to the same action.
 	// For example, multiple requests to the CAS, Action Cache, and Execution
 	// API are used in order to compile foo.cc.
@@ -4399,7 +4399,7 @@ func (*RequestMetadata) Descriptor() ([]byte, []int) {
 	return file_build_bazel_remote_execution_v2_remote_execution_proto_rawDescGZIP(), []int{44}
 }
 
-func (x *RequestMetadata) GetToolDetails() *ToolDetails {
+func (x *RequestMetadata) GetToolDetails() []*ToolDetails {
 	if x != nil {
 		return x.ToolDetails
 	}
@@ -5643,7 +5643,7 @@ var file_build_bazel_remote_execution_v2_remote_execution_proto_rawDesc = []byte
 	0x74, 0x6f, 0x6f, 0x6c, 0x56, 0x65, 0x72, 0x73, 0x69, 0x6f, 0x6e, 0x22, 0xda, 0x02, 0x0a, 0x0f,
 	0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x4d, 0x65, 0x74, 0x61, 0x64, 0x61, 0x74, 0x61, 0x12,
 	0x4f, 0x0a, 0x0c, 0x74, 0x6f, 0x6f, 0x6c, 0x5f, 0x64, 0x65, 0x74, 0x61, 0x69, 0x6c, 0x73, 0x18,
-	0x01, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x2c, 0x2e, 0x62, 0x75, 0x69, 0x6c, 0x64, 0x2e, 0x62, 0x61,
+	0x01, 0x20, 0x03, 0x28, 0x0b, 0x32, 0x2c, 0x2e, 0x62, 0x75, 0x69, 0x6c, 0x64, 0x2e, 0x62, 0x61,
 	0x7a, 0x65, 0x6c, 0x2e, 0x72, 0x65, 0x6d, 0x6f, 0x74, 0x65, 0x2e, 0x65, 0x78, 0x65, 0x63, 0x75,
 	0x74, 0x69, 0x6f, 0x6e, 0x2e, 0x76, 0x32, 0x2e, 0x54, 0x6f, 0x6f, 0x6c, 0x44, 0x65, 0x74, 0x61,
 	0x69, 0x6c, 0x73, 0x52, 0x0b, 0x74, 0x6f, 0x6f, 0x6c, 0x44, 0x65, 0x74, 0x61, 0x69, 0x6c, 0x73,
diff --git a/build/bazel/remote/execution/v2/remote_execution.proto b/build/bazel/remote/execution/v2/remote_execution.proto
index 31e20dcf..589cd502 100644
--- a/build/bazel/remote/execution/v2/remote_execution.proto
+++ b/build/bazel/remote/execution/v2/remote_execution.proto
@@ -2103,8 +2103,8 @@ message ToolDetails {
 // metadata, the user may ignore the base64 encoding and assume it is simply
 // serialized as a binary message.
 message RequestMetadata {
-  // The details for the tool invoking the requests.
-  ToolDetails tool_details = 1;
+  // The details for the tools involved in sending the requests.
+  repeated ToolDetails tool_details = 1;
 
   // An identifier that ties multiple requests to the same action.
   // For example, multiple requests to the CAS, Action Cache, and Execution