diff --git a/Dockerfile b/Dockerfile
index 2300991..5096b08 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -49,4 +49,4 @@ RUN --mount=type=bind,from=build,target=/tmp/build-layer,ro \
     && rm -rf /tmp/r8
 
 ENTRYPOINT ["/usr/bin/tini", "--"]
-CMD ["/opt/r8/monobase/build.sh", "--help"]
+CMD ["/opt/r8/monobase/run.sh", "monobase.build", "--help"]
diff --git a/mini.Dockerfile b/mini.Dockerfile
index 8c5370a..ba00f10 100644
--- a/mini.Dockerfile
+++ b/mini.Dockerfile
@@ -21,4 +21,4 @@ RUN /opt/r8/monobase/build.sh --skip-cuda --mini
 
 # Install a user venv
 # Do not reinstall uv & pget
-RUN NO_REINSTALL=1 /opt/r8/monobase/build.sh --skip-cuda --mini --requirements /tmp/requirements.txt
+RUN /opt/r8/monobase/run.sh monobase.build --skip-cuda --mini --requirements /tmp/requirements.txt
diff --git a/script/build-prod b/script/build-prod
index e1498d0..27ad3ff 100755
--- a/script/build-prod
+++ b/script/build-prod
@@ -7,7 +7,7 @@ main() {
   cd "$(git rev-parse --show-toplevel)"
 
   printf '# ---> using kubectl context "%s"\n' "$(kubectl config current-context)"
-  exec ./script/run-oneoff-pod build /opt/r8/monobase/build.sh "${@}"
+  exec ./script/run-oneoff-pod build /opt/r8/monobase/run.sh monobase.build "${@}"
 }
 
 main "${@}"
diff --git a/script/test b/script/test
index 235b98c..5fcaa8e 100755
--- a/script/test
+++ b/script/test
@@ -21,7 +21,8 @@ docker run --rm \
     --volume "$PWD/build/nfd-features.d:/etc/kubernetes/node-feature-discovery/features.d" \
     -e OTEL_EXPORTER_OTLP_ENDPOINT \
     monobase:latest \
-    /opt/r8/monobase/build.sh \
+    /opt/r8/monobase/run.sh \
+    monobase.build \
     --environment test \
     --skip-cuda \
     --cog-versions \
diff --git a/script/test-mini b/script/test-mini
index 628aed0..23974f3 100755
--- a/script/test-mini
+++ b/script/test-mini
@@ -26,7 +26,8 @@ docker run --rm \
     --volume "$PWD/build/monobase:/srv/r8/monobase" \
     --volume "$PWD/build/cache:/var/cache/monobase" \
     monobase:latest \
-    /opt/r8/monobase/build.sh \
+    /opt/r8/monobase/run.sh \
+    monobase.build \
     --environment test \
     --skip-cuda \
     --mini \
diff --git a/src/monobase/build.sh b/src/monobase/run.sh
similarity index 68%
rename from src/monobase/build.sh
rename to src/monobase/run.sh
index 7aedb85..7d4fe43 100755
--- a/src/monobase/build.sh
+++ b/src/monobase/run.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-# Build monobase
+# Run Python modules in monobase
 
 set -euo pipefail
 
@@ -15,10 +15,15 @@ log() {
     echo "$(date --iso-8601=seconds --utc) $*"
 }
 
+if [ $# -lt 1 ]; then
+    echo "Usage: $(basename "$0") <module> [arg]..."
+    exit 1
+fi
+
 # Always install latest uv and pget first
 # Unless explicitly disabled, e.g. in Dockerfile
 # So that we do not repack these into a user layer
-if [ -z "${NO_REINSTALL:-}" ]; then
+if ! [ -f "$MONOBASE_PREFIX/bin/uv" ] || ! [ -f "$MONOBASE_PREFIX/bin/pget-bin" ]; then
     mkdir -p "$MONOBASE_PREFIX/bin"
 
     log "Installing uv..."
@@ -34,8 +39,12 @@ if [ -z "${NO_REINSTALL:-}" ]; then
     cp /opt/r8/monobase/pget "$MONOBASE_PREFIX/bin/pget"
 fi
 
-uv venv /var/tmp/.venv --python='3.13'
-VIRTUAL_ENV=/var/tmp/.venv uv pip install --link-mode=copy "$(find /opt/r8 -name '*.whl' | head -1)"
+if ! [ -d /var/tmp/.venv ]; then
+    uv venv /var/tmp/.venv --python='3.13'
+    VIRTUAL_ENV=/var/tmp/.venv uv pip install --link-mode=copy "$(find /opt/r8 -name '*.whl' | head -1)"
+fi
 
-log "Running monobase.build..."
-exec /var/tmp/.venv/bin/python -m monobase.build "$@"
+module="$1"
+shift
+log "Running $module..."
+exec /var/tmp/.venv/bin/python -m "$module" "$@"