diff --git a/libs/cli/langgraph_cli/config.py b/libs/cli/langgraph_cli/config.py
index 9293d164e..16473083f 100644
--- a/libs/cli/langgraph_cli/config.py
+++ b/libs/cli/langgraph_cli/config.py
@@ -321,7 +321,9 @@ RUN cd {faux_path} && {install_cmd}
 
 ENV LANGSERVE_GRAPHS='{json.dumps(config["graphs"])}'
 
-WORKDIR {faux_path}"""
+WORKDIR {faux_path}
+
+RUN (test ! -f /api/langgraph_api/js/build.mts && echo "Prebuild script not found, skipping") || tsx /api/langgraph_api/js/build.mts"""
 
 
 def config_to_docker(config_path: pathlib.Path, config: Config, base_image: str):
diff --git a/libs/cli/tests/unit_tests/test_config.py b/libs/cli/tests/unit_tests/test_config.py
index e2afd214c..cff16ead6 100644
--- a/libs/cli/tests/unit_tests/test_config.py
+++ b/libs/cli/tests/unit_tests/test_config.py
@@ -252,7 +252,8 @@ ARG foo
 ADD . /deps/unit_tests
 RUN cd /deps/unit_tests && npm i
 ENV LANGSERVE_GRAPHS='{"agent": "./graphs/agent.js:graph"}'
-WORKDIR /deps/unit_tests"""
+WORKDIR /deps/unit_tests
+RUN (test ! -f /api/langgraph_api/js/build.mts && echo "Prebuild script not found, skipping") || tsx /api/langgraph_api/js/build.mts"""
 
     assert clean_empty_lines(actual_docker_stdin) == expected_docker_stdin