diff --git a/runtime/actions.cpp b/runtime/actions.cpp
index edc1d1f..acdfaf0 100644
--- a/runtime/actions.cpp
+++ b/runtime/actions.cpp
@@ -3,7 +3,7 @@
 
 auto sliger::rpc::action::RunDebug::perform_action(
     std::unique_ptr<sliger::rpc::BufferedWriter> writer,
-    vm_provider::VmProvider vm) -> void
+    vm_provider::VmProvider& vm) -> void
 {
     auto program = this->instructions;
     vm.load_and_run(program);
@@ -13,12 +13,12 @@ auto sliger::rpc::action::RunDebug::perform_action(
 
 auto sliger::rpc::action::FlameGraph::perform_action(
     std::unique_ptr<sliger::rpc::BufferedWriter> writer,
-    vm_provider::VmProvider vm) -> void
+    vm_provider::VmProvider& vm) -> void
 {
     auto json = vm.flame_graph_json();
     if (json) {
         writer->write(std::format(
-            "{{ \"ok\": true, \"flameGraph\": \"{}\"  }}", json.value()));
+            "{{ \"ok\": true, \"flameGraph\": {}  }}", json.value()));
     } else {
         writer->write("{ \"ok\": false }");
     }
@@ -27,12 +27,12 @@ auto sliger::rpc::action::FlameGraph::perform_action(
 
 auto sliger::rpc::action::CodeCoverage::perform_action(
     std::unique_ptr<sliger::rpc::BufferedWriter> writer,
-    vm_provider::VmProvider vm) -> void
+    vm_provider::VmProvider& vm) -> void
 {
     auto json = vm.code_coverage_json();
     if (json) {
         writer->write(std::format(
-            "{{ \"ok\": true, \"codeCoverage\": \"{}\"  }}", json.value()));
+            "{{ \"ok\": true, \"codeCoverage\": {} }}", json.value()));
     } else {
         writer->write("{ \"ok\": false }");
     }
diff --git a/runtime/actions.hpp b/runtime/actions.hpp
index 1e722ea..a19ba14 100644
--- a/runtime/actions.hpp
+++ b/runtime/actions.hpp
@@ -7,7 +7,7 @@ namespace sliger::rpc::action {
 struct Action {
     virtual auto perform_action(
         std::unique_ptr<sliger::rpc::BufferedWriter> writer,
-        sliger::rpc::vm_provider::VmProvider vm_provider) -> void = 0;
+        sliger::rpc::vm_provider::VmProvider& vm_provider) -> void = 0;
     virtual ~Action() = default;
 };
 
@@ -15,14 +15,14 @@ class FlameGraph : public Action {
 public:
     FlameGraph() { }
     auto perform_action(std::unique_ptr<sliger::rpc::BufferedWriter> writer,
-        sliger::rpc::vm_provider::VmProvider vm_provider) -> void;
+        sliger::rpc::vm_provider::VmProvider& vm_provider) -> void;
 };
 
 class CodeCoverage : public Action {
 public:
     CodeCoverage() { }
     auto perform_action(std::unique_ptr<sliger::rpc::BufferedWriter> writer,
-        sliger::rpc::vm_provider::VmProvider vm_provider) -> void;
+        sliger::rpc::vm_provider::VmProvider& vm_provider) -> void;
 };
 
 class RunDebug : public Action {
@@ -32,7 +32,7 @@ public:
     {
     }
     auto perform_action(std::unique_ptr<sliger::rpc::BufferedWriter> writer,
-        sliger::rpc::vm_provider::VmProvider vm_provider) -> void;
+        sliger::rpc::vm_provider::VmProvider& vm_provider) -> void;
 
 private:
     std::vector<uint32_t> instructions;
@@ -44,7 +44,7 @@ static auto action_from_json(
     auto& obj = value->as<sliger::json::Object>();
     auto type = obj.fields.at("type")->as<sliger::json::String>();
 
-    if (type.value == "flamegraph") {
+    if (type.value == "flame-graph") {
         auto action = FlameGraph();
         return std::make_unique<FlameGraph>(action);
     }