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diff --git a/src/buildtool/serve_api/serve_service/source_tree.hpp b/src/buildtool/serve_api/serve_service/source_tree.hpp
new file mode 100644
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+++ b/src/buildtool/serve_api/serve_service/source_tree.hpp
@@ -0,0 +1,70 @@
+// Copyright 2023 Huawei Cloud Computing Technology Co., Ltd.
+//
+// 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.
+
+#ifndef INCLUDED_SRC_BUILDTOOL_SERVE_API_SERVE_SERVICE_SOURCE_TREE_HPP
+#define INCLUDED_SRC_BUILDTOOL_SERVE_API_SERVE_SERVICE_SOURCE_TREE_HPP
+
+#include <filesystem>
+#include <memory>
+#include <optional>
+#include <string>
+#include <vector>
+
+#include "gsl/gsl"
+#include "justbuild/just_serve/just_serve.grpc.pb.h"
+#include "src/buildtool/execution_api/common/execution_api.hpp"
+#include "src/buildtool/execution_api/remote/config.hpp"
+#include "src/buildtool/logging/logger.hpp"
+
+class SourceTreeService final
+    : public justbuild::just_serve::SourceTree::Service {
+
+  public:
+    // Retrieve the tree of a commit.
+    //
+    // This request interrogates the service whether it knows a given Git
+    // commit. If requested commit is found, it provides the commit's
+    // Git-tree identifier.
+    //
+    // Errors:
+    //
+    // * `NOT_FOUND`: The requested commit could not be found.
+    auto ServeCommitTree(
+        ::grpc::ServerContext* context,
+        const ::justbuild::just_serve::ServeCommitTreeRequest* request,
+        ::justbuild::just_serve::ServeCommitTreeResponse* response)
+        -> ::grpc::Status override;
+
+  private:
+    std::shared_ptr<Logger> logger_{std::make_shared<Logger>("serve-service")};
+
+    // remote execution endpoint
+    gsl::not_null<IExecutionApi::Ptr> const remote_api_{
+        CreateExecutionApi(RemoteExecutionConfig::RemoteAddress())};
+    // local api
+    gsl::not_null<IExecutionApi::Ptr> const local_api_{
+        CreateExecutionApi(std::nullopt)};
+
+    [[nodiscard]] static auto CreateExecutionApi(
+        std::optional<RemoteExecutionConfig::ServerAddress> const& address)
+        -> gsl::not_null<IExecutionApi::Ptr>;
+
+    [[nodiscard]] static auto GetTreeFromCommit(
+        std::filesystem::path const& repo_path,
+        std::string const& commit,
+        std::string const& subdir,
+        std::shared_ptr<Logger> const& logger) -> std::optional<std::string>;
+};
+
+#endif