diff --git a/helper-scripts/project-impl/variables.sh b/helper-scripts/project-impl/variables.sh
index 552ca87..9e95c04 100644
--- a/helper-scripts/project-impl/variables.sh
+++ b/helper-scripts/project-impl/variables.sh
@@ -9,7 +9,7 @@ maven_version="3.9.3"
 maven_bin="./apache-maven-$maven_version/bin/mvn"
 
 lib_pomFile="./helper-scripts/project-impl/publishing/jector.pom"
-ext_pomFile="./helper-scripts/project-impl/publishing/jector.pom"
+ext_pomFile="./helper-scripts/project-impl/publishing/jector-monkey.pom"
 
 passphrase="avrsandbox"
 
diff --git a/helper-scripts/tests/check-pom-paths.py b/helper-scripts/tests/check-pom-paths.py
new file mode 100644
index 0000000..a6b8fda
--- /dev/null
+++ b/helper-scripts/tests/check-pom-paths.py
@@ -0,0 +1,9 @@
+"""Check publishing metadata paths without signing or publishing anything."""
+from pathlib import Path
+import re
+variables = (Path(__file__).parents[1] / "project-impl/variables.sh").read_text()
+paths = dict(re.findall(r'^(lib_pomFile|ext_pomFile)="([^"]+)"', variables, re.M))
+assert paths["lib_pomFile"] != paths["ext_pomFile"], "Core and extension POMs must not overwrite each other"
+assert Path(paths["lib_pomFile"]).name == "jector.pom"
+assert Path(paths["ext_pomFile"]).name == "jector-monkey.pom"
+print("PASS: distinct core and extension POM paths")