diff --git a/src/langbot/pkg/box/workspace.py b/src/langbot/pkg/box/workspace.py
index 948622ef..06df6b22 100644
--- a/src/langbot/pkg/box/workspace.py
+++ b/src/langbot/pkg/box/workspace.py
@@ -151,8 +151,14 @@ def wrap_python_command_with_env(command: str, *, mount_path: str = '/workspace'
         export TMP="$_LB_TMP_DIR"
         export PIP_CACHE_DIR="$_LB_PIP_CACHE_DIR"
 
+        _LB_SYSTEM_PYTHON="$(command -v python3 || command -v python || true)"
+        if [ -z "$_LB_SYSTEM_PYTHON" ]; then
+          echo "No Python interpreter found for workspace bootstrap" >&2
+          exit 1
+        fi
+
         _lb_python_meta() {{
-          python - <<'PY'
+          "$_LB_SYSTEM_PYTHON" - <<'PY'
         import hashlib
         import json
         import os
@@ -225,7 +231,7 @@ def wrap_python_command_with_env(command: str, *, mount_path: str = '/workspace'
 
           if [ "$_LB_NEEDS_BOOTSTRAP" -eq 1 ]; then
             rm -rf "$_LB_VENV_DIR"
-            python -m venv "$_LB_VENV_DIR"
+            "$_LB_SYSTEM_PYTHON" -m venv "$_LB_VENV_DIR"
             . "$_LB_VENV_DIR/bin/activate"
             python -m pip install --upgrade pip setuptools wheel
             if [ -f "{mount_path}/requirements.txt" ]; then
diff --git a/tests/unit_tests/provider/test_mcp_box_integration.py b/tests/unit_tests/provider/test_mcp_box_integration.py
index db1aa542..c7e080c0 100644
--- a/tests/unit_tests/provider/test_mcp_box_integration.py
+++ b/tests/unit_tests/provider/test_mcp_box_integration.py
@@ -509,7 +509,8 @@ class TestPythonWorkspacePreparation:
         )
 
         assert command is not None
-        assert 'python -m venv "$_LB_VENV_DIR"' in command
+        assert '_LB_SYSTEM_PYTHON="$(command -v python3 || command -v python || true)"' in command
+        assert '"$_LB_SYSTEM_PYTHON" -m venv "$_LB_VENV_DIR"' in command
         assert 'python -m pip install -r "/workspace/.mcp/u1/workspace/requirements.txt"' in command
         assert 'pip install --no-cache-dir -r' not in command
 
diff --git a/tests/unit_tests/provider/test_skill_tools.py b/tests/unit_tests/provider/test_skill_tools.py
index 96316ee5..7a9cde66 100644
--- a/tests/unit_tests/provider/test_skill_tools.py
+++ b/tests/unit_tests/provider/test_skill_tools.py
@@ -245,7 +245,8 @@ class TestSkillPathHelpers:
 
         command = wrap_skill_command_with_python_env('python scripts/run.py')
 
-        assert 'python -m venv "$_LB_VENV_DIR"' in command
+        assert '_LB_SYSTEM_PYTHON="$(command -v python3 || command -v python || true)"' in command
+        assert '"$_LB_SYSTEM_PYTHON" -m venv "$_LB_VENV_DIR"' in command
         assert 'export VIRTUAL_ENV="$_LB_VENV_DIR"' in command
         assert command.rstrip().endswith('python scripts/run.py')