diff --git a/package_io/build-spec.star b/package_io/build-spec.star
index c1f50f8..286661f 100644
--- a/package_io/build-spec.star
+++ b/package_io/build-spec.star
@@ -19,7 +19,8 @@ def create_service_for_build_spec(plan, service_name, image, build_file):
 def create_edit_and_build_spec(plan, service_name, image, chain_name, command, build_file):
     service = create_service_for_build_spec(plan, service_name, image, build_file)
 
-    plan.exec(service_name = service_name, recipe = command)
+    result = plan.exec(service_name = service_name, recipe = command)
+    plan.verify(result["code"], "==", 0)
 
     plan.store_service_files(service_name = service_name, src = "/tmp/{0}.json".format(chain_name), name = service_name)
 
diff --git a/parachain/build-spec.star b/parachain/build-spec.star
index 54b14d6..1a2c68e 100644
--- a/parachain/build-spec.star
+++ b/parachain/build-spec.star
@@ -26,21 +26,24 @@ def create_raw_build_spec_genisis_state_genisis_wasm(plan, binary, image, chain_
         "-c",
         "{0} build-spec --chain=/build/{1}.json --raw --disable-default-bootnode > /tmp/{1}-raw.json".format(binary, chain_name),
     ])
-    plan.exec(service_name = constant.RAW_BUILD_SPEC, recipe = command)
+    result = plan.exec(service_name = constant.RAW_BUILD_SPEC, recipe = command)
+    plan.verify(result["code"], "==", 0)
 
     command = ExecRecipe(command = [
         "/bin/sh",
         "-c",
         "{0} export-genesis-wasm --chain=/tmp/{1}-raw.json  > /tmp/{1}-genesis-wasm".format(binary, chain_name),
     ])
-    plan.exec(service_name = constant.RAW_BUILD_SPEC, recipe = command)
+    result = plan.exec(service_name = constant.RAW_BUILD_SPEC, recipe = command)
+    plan.verify(result["code"], "==", 0)
 
     command = ExecRecipe(command = [
         "/bin/sh",
         "-c",
         "{0} export-genesis-state --chain=/tmp/{1}-raw.json  > /tmp/{1}-genesis-state".format(binary, chain_name),
     ])
-    plan.exec(service_name = constant.RAW_BUILD_SPEC, recipe = command)
+    result = plan.exec(service_name = constant.RAW_BUILD_SPEC, recipe = command)
+    plan.verify(result["code"], "==", 0)
 
     # command = ExecRecipe(command = [
     #     "/bin/sh",
diff --git a/parachain/register-para-id.star b/parachain/register-para-id.star
index b62e47a..187a503 100644
--- a/parachain/register-para-id.star
+++ b/parachain/register-para-id.star
@@ -4,10 +4,12 @@ constant = import_module("../package_io/constant.star")
 def register_para_id(plan, alice_ip):
     plan.upload_files(src = "./static_files/javascript", name = "javascript")
     test = build_spec.create_service_for_build_spec(plan, constant.PARA_SLOT_REGISTER_SERVICE_NAME, constant.NODE_IMAGE, "javascript")
-    plan.exec(service_name = test.name, recipe = ExecRecipe(command = ["/bin/sh", "-c", "cd /build && npm i "]))
-    plan.exec(service_name = test.name, recipe = ExecRecipe(command = ["/bin/sh", "-c", "cd /build &&  node register ws://{0}:9944 //Alice ".format(alice_ip)]))
+    result = plan.exec(service_name = test.name, recipe = ExecRecipe(command = ["/bin/sh", "-c", "cd /build && npm i "]))
+    plan.verify(result["code"], "==", 0)
+    result = plan.exec(service_name = test.name, recipe = ExecRecipe(command = ["/bin/sh", "-c", "cd /build &&  node register ws://{0}:9944 //Alice ".format(alice_ip)]))
+    plan.verify(result["code"], "==", 0)
     para_id = plan.exec(service_name = test.name, recipe = ExecRecipe(command = ["/bin/sh", "-c", "cat /tmp/para.json | tr -d '\n\r'"]))
-
+    plan.verify(para_id["code"], "==", 0)
     plan.remove_service(test.name)
     return para_id["output"]
 
@@ -25,7 +27,9 @@ def onboard_genesis_state_and_wasm(plan, para_id, chain_name, alice_ip):
         ),
     )
 
-    plan.exec(service_name = service.name, recipe = ExecRecipe(command = ["/bin/sh", "-c", "cd /javascript && npm i "]))
-    plan.exec(service_name = service.name, recipe = ExecRecipe(command = ["/bin/sh", "-c", "cd /javascript &&  node onboard ws://{0}:9944 //Alice {1} /build/{2}-genesis-state /build/{2}-genesis-wasm".format(alice_ip, para_id, chain_name)]))
+    result = plan.exec(service_name = service.name, recipe = ExecRecipe(command = ["/bin/sh", "-c", "cd /javascript && npm i "]))
+    plan.verify(result["code"], "==", 0)
+    result = plan.exec(service_name = service.name, recipe = ExecRecipe(command = ["/bin/sh", "-c", "cd /javascript &&  node onboard ws://{0}:9944 //Alice {1} /build/{2}-genesis-state /build/{2}-genesis-wasm".format(alice_ip, para_id, chain_name)]))
+    plan.verify(result["code"], "==", 0)
 
     plan.remove_service(service.name)