diff --git a/README.md b/README.md
index 9659dcc..90fcc04 100644
--- a/README.md
+++ b/README.md
@@ -56,7 +56,7 @@ test                 ./tests/validate.sh
 hello                ./src/hello.sh
 env                  ./src/env.sh
 manifest             ./src/manifest.sh
-python-info          PYTHONPATH=lib/python python -m base_demo_cli
+python-info          ./bin/base-demo-python-info
 
 $ basectl run base-demo hello
 hello from base-demo
@@ -80,6 +80,8 @@ because activation sources `.base/activate.sh` into the project shell.
   for `basectl run`.
 - `lib/python/base_demo_cli` is a tiny Python command target that runs inside
   the Base-managed project environment.
+- `bin/base-demo-python-info` is the Bash launcher that delegates the Python
+  package to `base-wrapper`.
 - `demo/demo.sh` is the interactive walkthrough.
 - `tests/validate.sh` verifies that the repository baseline is intact.
 
diff --git a/base_manifest.yaml b/base_manifest.yaml
index a942476..9ca0e6c 100644
--- a/base_manifest.yaml
+++ b/base_manifest.yaml
@@ -13,7 +13,7 @@ commands:
   hello: ./src/hello.sh
   env: ./src/env.sh
   manifest: ./src/manifest.sh
-  python-info: PYTHONPATH=lib/python python -m base_demo_cli
+  python-info: ./bin/base-demo-python-info
 
 test:
   command: ./tests/validate.sh
diff --git a/bin/base-demo-python-info b/bin/base-demo-python-info
new file mode 100755
index 0000000..2b51ee3
--- /dev/null
+++ b/bin/base-demo-python-info
@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+
+if [[ -z "${BASE_HOME:-}" ]]; then
+  printf 'ERROR: BASE_HOME is not set. Run this through basectl or an activated Base shell.\n' >&2
+  exit 1
+fi
+
+if [[ -z "${BASE_PROJECT_ROOT:-}" ]]; then
+  printf 'ERROR: BASE_PROJECT_ROOT is not set. Run this through basectl or an activated Base shell.\n' >&2
+  exit 1
+fi
+
+if [[ -n "${PYTHONPATH:-}" ]]; then
+  PYTHONPATH="$BASE_PROJECT_ROOT/lib/python:$PYTHONPATH"
+else
+  PYTHONPATH="$BASE_PROJECT_ROOT/lib/python"
+fi
+export PYTHONPATH
+
+exec "$BASE_HOME/bin/base-wrapper" --project "${BASE_PROJECT:-base-demo}" base_demo_cli "$@"
diff --git a/demo/demo.sh b/demo/demo.sh
index 7e2348e..cb49971 100755
--- a/demo/demo.sh
+++ b/demo/demo.sh
@@ -1,5 +1,4 @@
 #!/usr/bin/env bash
-set -euo pipefail
 
 BASE_DEMO_PROJECT="${BASE_PROJECT:-base-demo}"
 BASE_DEMO_ROOT="${BASE_PROJECT_ROOT:-}"
@@ -19,13 +18,19 @@ demo_project_root() {
   cd -- "$(demo_script_dir)/.." && pwd -P
 }
 
-BASE_DEMO_ROOT="$(demo_project_root)"
+BASE_DEMO_ROOT="$(demo_project_root)" || {
+  printf 'ERROR: Unable to resolve base-demo project root.\n' >&2
+  exit 1
+}
 
 demo_workspace_root() {
   cd -- "$BASE_DEMO_ROOT/.." && pwd -P
 }
 
-BASE_DEMO_WORKSPACE="$(demo_workspace_root)"
+BASE_DEMO_WORKSPACE="$(demo_workspace_root)" || {
+  printf 'ERROR: Unable to resolve base-demo workspace root.\n' >&2
+  exit 1
+}
 
 usage() {
   cat <<'EOF'
@@ -120,6 +125,7 @@ project_shape_step() {
   step 1 "Project Shape"
   run_command test -f "$BASE_DEMO_ROOT/base_manifest.yaml"
   run_command test -f "$BASE_DEMO_ROOT/Brewfile"
+  run_command test -x "$BASE_DEMO_ROOT/bin/base-demo-python-info"
   run_command test -x "$BASE_DEMO_ROOT/src/hello.sh"
   run_command test -x "$BASE_DEMO_ROOT/src/env.sh"
   run_command test -x "$BASE_DEMO_ROOT/src/manifest.sh"
@@ -133,7 +139,7 @@ manifest_step() {
   run_command grep -n "hello: ./src/hello.sh" "$BASE_DEMO_ROOT/base_manifest.yaml"
   run_command grep -n "env: ./src/env.sh" "$BASE_DEMO_ROOT/base_manifest.yaml"
   run_command grep -n "manifest: ./src/manifest.sh" "$BASE_DEMO_ROOT/base_manifest.yaml"
-  run_command grep -n "python-info: PYTHONPATH=lib/python python -m base_demo_cli" "$BASE_DEMO_ROOT/base_manifest.yaml"
+  run_command grep -n "python-info: ./bin/base-demo-python-info" "$BASE_DEMO_ROOT/base_manifest.yaml"
   run_command grep -n "command: ./tests/validate.sh" "$BASE_DEMO_ROOT/base_manifest.yaml"
   run_command grep -n "script: ./demo/demo.sh" "$BASE_DEMO_ROOT/base_manifest.yaml"
   pause
@@ -142,7 +148,7 @@ manifest_step() {
 activation_step() {
   step 5 "Project Activation Source"
   # shellcheck source=/dev/null
-  source "$BASE_DEMO_ROOT/.base/activate.sh"
+  source "$BASE_DEMO_ROOT/.base/activate.sh" || return 1
   printf 'BASE_DEMO_ENV=%s\n' "${BASE_DEMO_ENV:-unset}"
   printf 'BASE_DEMO_ACTIVATED=%s\n' "${BASE_DEMO_ACTIVATED:-unset}"
   printf 'BASE_DEMO_PROJECT_KIND=%s\n' "${BASE_DEMO_PROJECT_KIND:-unset}"
@@ -240,7 +246,7 @@ main() {
     return "$status"
   }
 
-  cd -- "$BASE_DEMO_ROOT"
+  cd -- "$BASE_DEMO_ROOT" || return 1
   intro
   project_shape_step
   manifest_step
diff --git a/src/env.sh b/src/env.sh
index 8bf462a..b55cc33 100755
--- a/src/env.sh
+++ b/src/env.sh
@@ -1,5 +1,4 @@
 #!/usr/bin/env bash
-set -euo pipefail
 
 print_var() {
   local name="$1"
diff --git a/src/hello.sh b/src/hello.sh
index 7c712a3..f31564b 100755
--- a/src/hello.sh
+++ b/src/hello.sh
@@ -1,5 +1,4 @@
 #!/usr/bin/env bash
-set -euo pipefail
 
 printf 'hello from base-demo\n'
 printf 'BASE_PROJECT=%s\n' "${BASE_PROJECT:-unset}"
diff --git a/src/manifest.sh b/src/manifest.sh
index dcacd1b..6ecfbfd 100755
--- a/src/manifest.sh
+++ b/src/manifest.sh
@@ -1,5 +1,4 @@
 #!/usr/bin/env bash
-set -euo pipefail
 
 manifest="${BASE_PROJECT_MANIFEST:-base_manifest.yaml}"
 
diff --git a/tests/demo_test.bats b/tests/demo_test.bats
index 4ea58dd..fbd4b2e 100755
--- a/tests/demo_test.bats
+++ b/tests/demo_test.bats
@@ -45,7 +45,7 @@ case "$*" in
     printf 'hello       ./src/hello.sh\n'
     printf 'env         ./src/env.sh\n'
     printf 'manifest    ./src/manifest.sh\n'
-    printf 'python-info PYTHONPATH=lib/python python -m base_demo_cli\n'
+    printf 'python-info ./bin/base-demo-python-info\n'
     ;;
   run\ base-demo\ --workspace\ *\ hello)
     printf 'hello from base-demo\n'
diff --git a/tests/validate.sh b/tests/validate.sh
index 899b216..92ffa0b 100755
--- a/tests/validate.sh
+++ b/tests/validate.sh
@@ -1,5 +1,4 @@
 #!/usr/bin/env bash
-set -euo pipefail
 
 required_files=(
   README.md
@@ -10,6 +9,7 @@ required_files=(
   base_manifest.yaml
   Brewfile
   .base/activate.sh
+  bin/base-demo-python-info
   src/hello.sh
   src/env.sh
   src/manifest.sh
@@ -27,7 +27,7 @@ for file in "${required_files[@]}"; do
   }
 done
 
-for executable in tests/validate.sh .base/activate.sh src/hello.sh src/env.sh src/manifest.sh demo/demo.sh; do
+for executable in tests/validate.sh .base/activate.sh bin/base-demo-python-info src/hello.sh src/env.sh src/manifest.sh demo/demo.sh; do
   [[ -x "$executable" ]] || {
     printf 'Required file is not executable: %s\n' "$executable" >&2
     exit 1
@@ -64,7 +64,7 @@ grep -Fq 'manifest: ./src/manifest.sh' base_manifest.yaml || {
   exit 1
 }
 
-grep -Fq 'python-info: PYTHONPATH=lib/python python -m base_demo_cli' base_manifest.yaml || {
+grep -Fq 'python-info: ./bin/base-demo-python-info' base_manifest.yaml || {
   printf 'base_manifest.yaml does not declare the python-info command.\n' >&2
   exit 1
 }