diff --git a/willow/proto/shell/BUILD b/willow/proto/shell/BUILD
new file mode 100644
index 0000000..e40bf52
--- /dev/null
+++ b/willow/proto/shell/BUILD
@@ -0,0 +1,63 @@
+# Copyright 2025 Google LLC
+#
+# 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.
+
+load("@rules_rust//rust:defs.bzl", "rust_library", "rust_test")
+load("@protobuf//bazel:cc_proto_library.bzl", "cc_proto_library")
+load("@protobuf//bazel:proto_library.bzl", "proto_library")
+load("@protobuf//rust:defs.bzl", "rust_proto_library")
+
+package(
+    default_visibility = ["//visibility:public"],
+)
+
+# Parameters proto
+proto_library(
+    name = "shell_parameters_proto",
+    srcs = ["parameters.proto"],
+)
+
+cc_proto_library(
+    name = "shell_parameters_cc_proto",
+    deps = [":shell_parameters_proto"],
+)
+
+rust_proto_library(
+    name = "shell_parameters_rust_proto",
+    deps = [":shell_parameters_proto"],
+)
+
+# Utilities for parameters proto (e.g. conversion between rust structs and protos)
+rust_library(
+    name = "shell_parameters_proto_utils",
+    srcs = ["parameters_proto_utils.rs"],
+    crate_root = "parameters_proto_utils.rs",
+    deps = [
+        ":shell_parameters_rust_proto",
+        "@protobuf//rust:protobuf",
+        "//shell_wrapper:kahe",
+        "//shell_wrapper:status",
+        "//willow/src/shell:kahe_shell",
+    ],
+)
+
+rust_test(
+    name = "shell_parameters_proto_utils_test",
+    crate = ":shell_parameters_proto_utils",
+    deps = [
+        ":shell_parameters_proto_utils",
+        "@crate_index//:googletest",
+        "@protobuf//rust:protobuf_gtest_matchers",
+        "//shell_wrapper:status",
+    ],
+)
diff --git a/willow/src/shell/parameters.proto b/willow/proto/shell/parameters.proto
similarity index 100%
rename from willow/src/shell/parameters.proto
rename to willow/proto/shell/parameters.proto
diff --git a/willow/src/shell/parameters_utils.rs b/willow/proto/shell/parameters_proto_utils.rs
similarity index 100%
rename from willow/src/shell/parameters_utils.rs
rename to willow/proto/shell/parameters_proto_utils.rs
diff --git a/willow/src/shell/BUILD b/willow/src/shell/BUILD
index eb679dd..6032aec 100644
--- a/willow/src/shell/BUILD
+++ b/willow/src/shell/BUILD
@@ -13,9 +13,6 @@
 # limitations under the License.
 
 load("@rules_rust//rust:defs.bzl", "rust_library", "rust_test")
-load("@protobuf//bazel:cc_proto_library.bzl", "cc_proto_library")
-load("@protobuf//bazel:proto_library.bzl", "proto_library")
-load("@protobuf//rust:defs.bzl", "rust_proto_library")
 
 package(
     default_applicable_licenses = [
@@ -100,47 +97,6 @@ rust_library(
     ],
 )
 
-# Parameters proto
-proto_library(
-    name = "shell_parameters_proto",
-    srcs = ["parameters.proto"],
-)
-
-cc_proto_library(
-    name = "shell_parameters_cc_proto",
-    deps = [":shell_parameters_proto"],
-)
-
-rust_proto_library(
-    name = "shell_parameters_rust_proto",
-    deps = [":shell_parameters_proto"],
-)
-
-# Parameters utilities (e.g. conversion between rust structs and protos)
-rust_library(
-    name = "shell_parameters_utils",
-    srcs = ["parameters_utils.rs"],
-    crate_root = "parameters_utils.rs",
-    deps = [
-        ":kahe_shell",
-        ":shell_parameters_rust_proto",
-        "@protobuf//rust:protobuf",
-        "//shell_wrapper:kahe",
-        "//shell_wrapper:status",
-    ],
-)
-
-rust_test(
-    name = "shell_parameters_utils_test",
-    crate = ":shell_parameters_utils",
-    deps = [
-        ":shell_parameters_utils",
-        "@crate_index//:googletest",
-        "@protobuf//rust:protobuf_gtest_matchers",
-        "//shell_wrapper:status",
-    ],
-)
-
 # Parameter generation
 rust_library(
     name = "shell_parameters_generation",