Pradeek · October 14, 2025 13:09 · Oct 14, 2025
diff --git a/enforce-uv-python.py b/enforce-uv-python.py
@@ -0,0 +1,58 @@
+#!/usr/bin/env python3
+"""
+PreToolUse hook that denies bare 'python' commands in uv projects.
+Enforces using 'uv run python' for proper virtual environment isolation.
+Only applies when project has uv indicators (pyproject.toml with uv.lock or .venv managed by uv).
+Put this under ~/.claude/hooks/
+"""
+import json
+import sys
+import os
+import re
+from datetime import datetime
+from pathlib import Path
+
+# Read input
+input_data = json.load(sys.stdin)
+
+# Extract tool information
+tool_name = input_data.get('tool_name', '')
+tool_input = input_data.get('tool_input', {})
+
+# Check if it's a Bash tool
+if tool_name == 'Bash':
+    command = tool_input.get('command', '').strip()
+    cwd = input_data.get('cwd', '')
+
+    # Check if command starts with 'python' (but not 'python3' or specific paths)
+    python_pattern = r'^python(?:\s|$)'
+    uses_bare_python = bool(re.match(python_pattern, command))
+
+    if uses_bare_python:
+        # Check if this is a uv project by looking for indicators
+        def is_uv_project(directory):
+            path = Path(directory)
+
+            # Walk up the directory tree looking for project root
+            for current_path in [path] + list(path.parents):
+                # Check for pyproject.toml + uv.lock
+                pyproject_path = current_path / "pyproject.toml"
+                uv_lock_path = current_path / "uv.lock"
+
+                if pyproject_path.exists() and uv_lock_path.exists():
+                    return True
+
+                # Check for .venv with pyvenv.cfg mentioning uv
+                venv_path = current_path / ".venv" / "pyvenv.cfg"
+                if venv_path.exists():
+                    try:
+                        with open(venv_path) as f:
+                            content = f.read()
+                            if 'uv' in content.lower():
+                                return True
+                    except:
+                        pass
+
+                # Stop at git root or filesystem root
+                if (current_path / ".git").exists() or current_path == current_path.parent:
+                    break
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