diff --git a/runtime/main.cpp b/runtime/main.cpp
index 1c24bad..2fb866c 100644
--- a/runtime/main.cpp
+++ b/runtime/main.cpp
@@ -93,6 +93,13 @@ auto compile_asm(const std::vector<AsmLine>& lines) -> std::vector<uint32_t>
 auto execute_action(std::unique_ptr<sliger::json::Value> req,
     std::unique_ptr<sliger::rpc::BufferedWriter> writer)
 {
+    auto node = req->as<sliger::json::Object>();
+    auto& type = node.fields.at("type")->as<sliger::json::String>();
+    if (type.value == "some_type") {
+        /* etc. */
+    } else {
+        /* unrecognized action */
+    }
 }
 
 int main()