diff --git a/.github/workflows/build-test.yml b/.github/workflows/build-test.yml
index 240b7cb..0169986 100644
--- a/.github/workflows/build-test.yml
+++ b/.github/workflows/build-test.yml
@@ -22,5 +22,5 @@ jobs:
       run: cmake --build "$BUILD_DIR" --config $CMAKE_BUILD_TYPE
 
     - name: Test
-      working-directory: ${{github.workspace}}/build
+      working-directory: ${{env.BUILD_DIR}}
       run: ctest --config $CMAKE_BUILD_TYPE --output-on-failure
diff --git a/cmake/nlohmann.cmake b/cmake/nlohmann.cmake
index ab38701..7254a7e 100644
--- a/cmake/nlohmann.cmake
+++ b/cmake/nlohmann.cmake
@@ -4,4 +4,10 @@ FetchContent_Declare(json
   URL https://github.com/nlohmann/json/releases/download/v3.11.2/json.tar.xz
   DOWNLOAD_EXTRACT_TIMESTAMP ON
 )
-FetchContent_MakeAvailable(json)
+
+# Manually make available so we can mark library as SYSTEM headers thus disabling warnings
+FetchContent_GetProperties(json)
+if(NOT json_POPULATED)
+  FetchContent_Populate(json)
+  add_subdirectory(${json_SOURCE_DIR} ${json_BINARY_DIR} SYSTEM)
+endif()
\ No newline at end of file
diff --git a/include/uls/server.h b/include/uls/server.h
index 78f2653..f7efe57 100644
--- a/include/uls/server.h
+++ b/include/uls/server.h
@@ -29,6 +29,7 @@ class Server
     bool is_running{false};
 
     void send(const std::string& message_type, const nlohmann::json& message);
+    void send_error(const nlohmann::json& message);
 
 public:
     Server(IOStream io): io(std::move(io)) {}
@@ -58,7 +59,7 @@ class Server
     void send_notification(const std::string& type, Data&& element)
     {
         auto message = Serializer<std::remove_reference_t<Data>>::serialize(std::forward<Data>(element));
-        send(type, message);
+        send("notif/" + type, message);
     }
 
     void start();
diff --git a/src/highlight.cpp b/src/highlight.cpp
index 0fbbd1f..aac68e9 100644
--- a/src/highlight.cpp
+++ b/src/highlight.cpp
@@ -50,11 +50,11 @@ void Highlight::configure(Server& server)
 
     repository.add_on_document_update([this, &server](UTAP::Document& doc) {
         auto keywords = keywords_for_path(doc, repository.get_current_xpath());
-        server.send_notification("notif/keywords", keywords);
+        server.send_notification("keywords", keywords);
     });
 
     repository.add_on_current_node_changed([this, &server](const std::string& xpath) {
         auto keywords = keywords_for_path(repository.get_document(), xpath);
-        server.send_notification("notif/keywords", keywords);
+        server.send_notification("keywords", keywords);
     });
 }
\ No newline at end of file
diff --git a/src/server.cpp b/src/server.cpp
index b09d984..794028b 100644
--- a/src/server.cpp
+++ b/src/server.cpp
@@ -9,8 +9,8 @@ namespace views = std::ranges::views;
 using namespace std::chrono_literals;
 using json = nlohmann::json;
 
-nlohmann::json OK_RESPONSE = {{"res", "OK"}};
-nlohmann::json FAIL_RESPONSE = {{"res", "FAIL"}};
+nlohmann::json OK_RESPONSE = {"OK"};
+nlohmann::json FAIL_RESPONSE = {"FAIL"};
 
 std::vector<Command>::const_iterator find_command(const std::vector<Command>& commands, const std::string& name)
 {
@@ -34,10 +34,10 @@ void Server::start()
             auto response = cmd->callback(message["args"]);
             send("response/" + cmd->name, response);
         } catch (nlohmann::json::parse_error& e) {
-            send("error", e.what());
+            send_error(e.what());
             stop();
         } catch (std::exception& e) {
-            send("error", e.what());
+            send_error(e.what());
         }
     }
 }
@@ -53,7 +53,12 @@ Server& Server::add_close_command(std::string name)
 
 void Server::send(const std::string& message_type, const nlohmann::json& message)
 {
-    io.out << json{{"type", message_type}, {"msg", message}} << std::endl;
+    io.out << json{{"res", message_type}, {"info", message}} << std::endl;
+}
+
+void Server::send_error(const nlohmann::json& message)
+{
+    send("err", message);
 }
 
 void Server::stop() { is_running = false; }
diff --git a/test/server_mock.h b/test/server_mock.h
index 8291458..7b22400 100644
--- a/test/server_mock.h
+++ b/test/server_mock.h
@@ -26,14 +26,14 @@ struct MockIO : IOStream
     {
         nlohmann::json message;
         out_buf >> message;
-        return message["msg"];
+        return message["info"];
     }
 
     bool expect_error()
     {
         nlohmann::json message;
         out_buf >> message;
-        return message["type"] == "error";
+        return message["type"] == "err";
     }
 
     bool out_eof() { return out_buf.eof(); }