diff --git a/shell/preload/sandbox.js b/shell/preload/sandbox.js
new file mode 100644
index 00000000..6ccca063
--- /dev/null
+++ b/shell/preload/sandbox.js
@@ -0,0 +1,233 @@
+const Module = require('module');
+const path = require('path');
+const fs = require('fs');
+
+// Get the QL_DIR and data directory paths
+const qlDir = process.env.QL_DIR || path.join(__dirname, '../../');
+let dataDir = process.env.QL_DATA_DIR || path.join(qlDir, 'data');
+
+// Remove trailing slash if present
+dataDir = dataDir.replace(/\/$/, '');
+
+// Normalize paths to avoid bypassing with relative paths or symlinks
+const normalizedQlDir = fs.existsSync(qlDir) ? fs.realpathSync(qlDir) : path.resolve(qlDir);
+const normalizedDataDir = fs.existsSync(dataDir) ? fs.realpathSync(dataDir) : path.resolve(dataDir);
+
+// Protected directories - no write access allowed
+const protectedPaths = [
+  path.join(normalizedQlDir, 'back'),
+  path.join(normalizedQlDir, 'src'),
+  path.join(normalizedQlDir, 'shell'),
+  path.join(normalizedQlDir, 'sample'),
+  path.join(normalizedQlDir, 'node_modules'),
+  path.join(normalizedDataDir, 'config'),
+  path.join(normalizedDataDir, 'db'),
+];
+
+// Allowed write directories - scripts can write here
+const allowedWritePaths = [
+  path.join(normalizedDataDir, 'scripts'),
+  path.join(normalizedDataDir, 'log'),
+  path.join(normalizedDataDir, 'repo'),
+  path.join(normalizedDataDir, 'raw'),
+  path.join(normalizedQlDir, '.tmp'),
+  '/tmp',
+];
+
+// Check if sandboxing is enabled (default: true)
+const sandboxEnabled = process.env.QL_DISABLE_SANDBOX !== 'true';
+
+function isPathProtected(targetPath) {
+  if (!sandboxEnabled) {
+    return false;
+  }
+
+  try {
+    // Resolve to absolute path and follow symlinks
+    const resolvedPath = fs.realpathSync.native ? 
+      fs.realpathSync.native(targetPath) : 
+      path.resolve(targetPath);
+    
+    // Check if path is in a protected directory
+    for (const protectedPath of protectedPaths) {
+      if (resolvedPath.startsWith(protectedPath + path.sep) || resolvedPath === protectedPath) {
+        // Check if it's in an allowed subdirectory
+        const isInAllowedPath = allowedWritePaths.some(allowedPath => 
+          resolvedPath.startsWith(allowedPath + path.sep) || resolvedPath === allowedPath
+        );
+        
+        if (!isInAllowedPath) {
+          return true;
+        }
+      }
+    }
+    
+    // Also check if trying to write outside data/scripts without being in allowed paths
+    const isInQlDir = resolvedPath.startsWith(normalizedQlDir + path.sep) || resolvedPath === normalizedQlDir;
+    const isInDataDir = resolvedPath.startsWith(normalizedDataDir + path.sep) || resolvedPath === normalizedDataDir;
+    
+    if (isInQlDir || isInDataDir) {
+      const isInAllowedPath = allowedWritePaths.some(allowedPath => 
+        resolvedPath.startsWith(allowedPath + path.sep) || resolvedPath === allowedPath
+      );
+      
+      if (!isInAllowedPath) {
+        return true;
+      }
+    }
+    
+    return false;
+  } catch (err) {
+    // If path doesn't exist yet, check parent directory
+    const parentPath = path.dirname(targetPath);
+    if (parentPath !== targetPath) {
+      return isPathProtected(parentPath);
+    }
+    return false;
+  }
+}
+
+function createSecurityError(operation, targetPath) {
+  const err = new Error(
+    `Security Error: Script attempted to ${operation} protected path: ${targetPath}\n` +
+    `Scripts are only allowed to write to: ${allowedWritePaths.join(', ')}`
+  );
+  err.code = 'EACCES';
+  return err;
+}
+
+// Store original fs methods
+const originalFS = {};
+const writeOperations = [
+  'writeFile', 'writeFileSync',
+  'appendFile', 'appendFileSync',
+  'mkdir', 'mkdirSync',
+  'rmdir', 'rmdirSync',
+  'unlink', 'unlinkSync',
+  'rm', 'rmSync',
+  'rename', 'renameSync',
+  'copyFile', 'copyFileSync',
+  'chmod', 'chmodSync',
+  'chown', 'chownSync',
+  'link', 'linkSync',
+  'symlink', 'symlinkSync',
+  'truncate', 'truncateSync',
+  'utimes', 'utimesSync',
+];
+
+// Wrap fs methods
+for (const method of writeOperations) {
+  if (fs[method]) {
+    originalFS[method] = fs[method];
+  }
+}
+
+function wrapFsMethod(method, isSync) {
+  return function(...args) {
+    const targetPath = args[0];
+    
+    if (isPathProtected(targetPath)) {
+      const err = createSecurityError(method, targetPath);
+      if (isSync) {
+        throw err;
+      } else {
+        const callback = args[args.length - 1];
+        if (typeof callback === 'function') {
+          process.nextTick(() => callback(err));
+          return;
+        }
+        throw err;
+      }
+    }
+    
+    // For rename/copy operations, check destination too
+    if ((method.startsWith('rename') || method.startsWith('copy')) && args[1]) {
+      if (isPathProtected(args[1])) {
+        const err = createSecurityError(method, args[1]);
+        if (isSync) {
+          throw err;
+        } else {
+          const callback = args[args.length - 1];
+          if (typeof callback === 'function') {
+            process.nextTick(() => callback(err));
+            return;
+          }
+          throw err;
+        }
+      }
+    }
+    
+    return originalFS[method].apply(fs, args);
+  };
+}
+
+// Apply wrappers
+if (sandboxEnabled) {
+  for (const method of writeOperations) {
+    if (fs[method]) {
+      const isSync = method.endsWith('Sync');
+      fs[method] = wrapFsMethod(method, isSync);
+    }
+  }
+
+  // Wrap createWriteStream
+  originalFS.createWriteStream = fs.createWriteStream;
+  fs.createWriteStream = function(targetPath, options) {
+    if (isPathProtected(targetPath)) {
+      throw createSecurityError('createWriteStream', targetPath);
+    }
+    return originalFS.createWriteStream.call(fs, targetPath, options);
+  };
+
+  // Wrap promises API if it exists
+  if (fs.promises) {
+    const promisesOriginal = {};
+    const promisesMethods = [
+      'writeFile', 'appendFile', 'mkdir', 'rmdir', 'unlink', 'rm',
+      'rename', 'copyFile', 'chmod', 'chown', 'link', 'symlink',
+      'truncate', 'utimes',
+    ];
+
+    for (const method of promisesMethods) {
+      if (fs.promises[method]) {
+        promisesOriginal[method] = fs.promises[method];
+        fs.promises[method] = async function(...args) {
+          const targetPath = args[0];
+          
+          if (isPathProtected(targetPath)) {
+            throw createSecurityError(method, targetPath);
+          }
+          
+          // For rename/copy operations, check destination too
+          if ((method === 'rename' || method === 'copyFile') && args[1]) {
+            if (isPathProtected(args[1])) {
+              throw createSecurityError(method, args[1]);
+            }
+          }
+          
+          return promisesOriginal[method].apply(fs.promises, args);
+        };
+      }
+    }
+  }
+}
+
+// Prevent requiring the original fs module to bypass sandbox
+const originalRequire = Module.prototype.require;
+Module.prototype.require = function(id) {
+  const module = originalRequire.apply(this, arguments);
+  
+  // Return wrapped fs module
+  if (id === 'fs' || id === 'node:fs') {
+    return fs;
+  }
+  
+  return module;
+};
+
+module.exports = {
+  sandboxEnabled,
+  isPathProtected,
+  protectedPaths,
+  allowedWritePaths,
+};
diff --git a/shell/preload/sandbox.py b/shell/preload/sandbox.py
new file mode 100644
index 00000000..5bdce2ce
--- /dev/null
+++ b/shell/preload/sandbox.py
@@ -0,0 +1,326 @@
+import os
+import sys
+import builtins
+from pathlib import Path
+
+# Get the QL_DIR and data directory paths
+ql_dir = os.environ.get('QL_DIR', os.path.join(os.path.dirname(__file__), '../..'))
+data_dir = os.environ.get('QL_DATA_DIR', os.path.join(ql_dir, 'data'))
+
+# Normalize paths to avoid bypassing with relative paths or symlinks
+try:
+    normalized_ql_dir = os.path.realpath(ql_dir)
+    normalized_data_dir = os.path.realpath(data_dir)
+except:
+    normalized_ql_dir = os.path.abspath(ql_dir)
+    normalized_data_dir = os.path.abspath(data_dir)
+
+# Protected directories - no write access allowed
+protected_paths = [
+    os.path.join(normalized_ql_dir, 'back'),
+    os.path.join(normalized_ql_dir, 'src'),
+    os.path.join(normalized_ql_dir, 'shell'),
+    os.path.join(normalized_ql_dir, 'sample'),
+    os.path.join(normalized_ql_dir, 'node_modules'),
+    os.path.join(normalized_data_dir, 'config'),
+    os.path.join(normalized_data_dir, 'db'),
+]
+
+# Allowed write directories - scripts can write here
+allowed_write_paths = [
+    os.path.join(normalized_data_dir, 'scripts'),
+    os.path.join(normalized_data_dir, 'log'),
+    os.path.join(normalized_data_dir, 'repo'),
+    os.path.join(normalized_data_dir, 'raw'),
+    os.path.join(normalized_ql_dir, '.tmp'),
+    '/tmp',
+]
+
+# Check if sandboxing is enabled (default: true)
+sandbox_enabled = os.environ.get('QL_DISABLE_SANDBOX') != 'true'
+
+def is_path_protected(target_path):
+    """Check if a path is protected from write operations"""
+    if not sandbox_enabled:
+        return False
+    
+    try:
+        # Resolve to absolute path and follow symlinks
+        resolved_path = os.path.realpath(target_path)
+        
+        # Check if path is in a protected directory
+        for protected_path in protected_paths:
+            if resolved_path.startswith(protected_path + os.sep) or resolved_path == protected_path:
+                # Check if it's in an allowed subdirectory
+                is_in_allowed_path = any(
+                    resolved_path.startswith(allowed_path + os.sep) or resolved_path == allowed_path
+                    for allowed_path in allowed_write_paths
+                )
+                
+                if not is_in_allowed_path:
+                    return True
+        
+        # Also check if trying to write inside ql_dir or data_dir without being in allowed paths
+        is_in_ql_dir = resolved_path.startswith(normalized_ql_dir + os.sep) or resolved_path == normalized_ql_dir
+        is_in_data_dir = resolved_path.startswith(normalized_data_dir + os.sep) or resolved_path == normalized_data_dir
+        
+        if is_in_ql_dir or is_in_data_dir:
+            is_in_allowed_path = any(
+                resolved_path.startswith(allowed_path + os.sep) or resolved_path == allowed_path
+                for allowed_path in allowed_write_paths
+            )
+            
+            if not is_in_allowed_path:
+                return True
+        
+        return False
+    except:
+        # If path doesn't exist yet, check parent directory
+        parent_path = os.path.dirname(target_path)
+        if parent_path != target_path:
+            return is_path_protected(parent_path)
+        return False
+
+def create_security_error(operation, target_path):
+    """Create a security error for unauthorized file operations"""
+    return PermissionError(
+        f"Security Error: Script attempted to {operation} protected path: {target_path}\n"
+        f"Scripts are only allowed to write to: {', '.join(allowed_write_paths)}"
+    )
+
+# Store original functions
+original_open = builtins.open
+original_os_remove = os.remove
+original_os_unlink = os.unlink
+original_os_rmdir = os.rmdir
+original_os_mkdir = os.mkdir
+original_os_makedirs = os.makedirs
+original_os_rename = os.rename
+original_os_replace = os.replace
+original_os_chmod = os.chmod
+original_os_chown = os.chown if hasattr(os, 'chown') else None
+original_os_link = os.link if hasattr(os, 'link') else None
+original_os_symlink = os.symlink if hasattr(os, 'symlink') else None
+original_os_truncate = os.truncate if hasattr(os, 'truncate') else None
+original_os_utime = os.utime if hasattr(os, 'utime') else None
+
+# Wrap open() to check write operations
+def sandboxed_open(file, mode='r', *args, **kwargs):
+    """Wrapped open() that checks for protected paths on write operations"""
+    if sandbox_enabled and isinstance(mode, str) and any(m in mode for m in ['w', 'a', 'x', '+']):
+        if is_path_protected(file):
+            raise create_security_error('open for writing', file)
+    return original_open(file, mode, *args, **kwargs)
+
+# Wrap os functions
+def sandboxed_remove(path, *args, **kwargs):
+    if sandbox_enabled and is_path_protected(path):
+        raise create_security_error('remove', path)
+    return original_os_remove(path, *args, **kwargs)
+
+def sandboxed_unlink(path, *args, **kwargs):
+    if sandbox_enabled and is_path_protected(path):
+        raise create_security_error('unlink', path)
+    return original_os_unlink(path, *args, **kwargs)
+
+def sandboxed_rmdir(path, *args, **kwargs):
+    if sandbox_enabled and is_path_protected(path):
+        raise create_security_error('rmdir', path)
+    return original_os_rmdir(path, *args, **kwargs)
+
+def sandboxed_mkdir(path, *args, **kwargs):
+    if sandbox_enabled and is_path_protected(path):
+        raise create_security_error('mkdir', path)
+    return original_os_mkdir(path, *args, **kwargs)
+
+def sandboxed_makedirs(name, *args, **kwargs):
+    if sandbox_enabled and is_path_protected(name):
+        raise create_security_error('makedirs', name)
+    return original_os_makedirs(name, *args, **kwargs)
+
+def sandboxed_rename(src, dst, *args, **kwargs):
+    if sandbox_enabled:
+        if is_path_protected(src):
+            raise create_security_error('rename (source)', src)
+        if is_path_protected(dst):
+            raise create_security_error('rename (destination)', dst)
+    return original_os_rename(src, dst, *args, **kwargs)
+
+def sandboxed_replace(src, dst, *args, **kwargs):
+    if sandbox_enabled:
+        if is_path_protected(src):
+            raise create_security_error('replace (source)', src)
+        if is_path_protected(dst):
+            raise create_security_error('replace (destination)', dst)
+    return original_os_replace(src, dst, *args, **kwargs)
+
+def sandboxed_chmod(path, *args, **kwargs):
+    if sandbox_enabled and is_path_protected(path):
+        raise create_security_error('chmod', path)
+    return original_os_chmod(path, *args, **kwargs)
+
+def sandboxed_chown(path, *args, **kwargs):
+    if sandbox_enabled and is_path_protected(path):
+        raise create_security_error('chown', path)
+    return original_os_chown(path, *args, **kwargs)
+
+def sandboxed_link(src, dst, *args, **kwargs):
+    if sandbox_enabled:
+        if is_path_protected(dst):
+            raise create_security_error('link', dst)
+    return original_os_link(src, dst, *args, **kwargs)
+
+def sandboxed_symlink(src, dst, *args, **kwargs):
+    if sandbox_enabled:
+        if is_path_protected(dst):
+            raise create_security_error('symlink', dst)
+    return original_os_symlink(src, dst, *args, **kwargs)
+
+def sandboxed_truncate(path, *args, **kwargs):
+    if sandbox_enabled and is_path_protected(path):
+        raise create_security_error('truncate', path)
+    return original_os_truncate(path, *args, **kwargs)
+
+def sandboxed_utime(path, *args, **kwargs):
+    if sandbox_enabled and is_path_protected(path):
+        raise create_security_error('utime', path)
+    return original_os_utime(path, *args, **kwargs)
+
+# Apply sandbox wrappers
+if sandbox_enabled:
+    builtins.open = sandboxed_open
+    os.remove = sandboxed_remove
+    os.unlink = sandboxed_unlink
+    os.rmdir = sandboxed_rmdir
+    os.mkdir = sandboxed_mkdir
+    os.makedirs = sandboxed_makedirs
+    os.rename = sandboxed_rename
+    os.replace = sandboxed_replace
+    os.chmod = sandboxed_chmod
+    if original_os_chown:
+        os.chown = sandboxed_chown
+    if original_os_link:
+        os.link = sandboxed_link
+    if original_os_symlink:
+        os.symlink = sandboxed_symlink
+    if original_os_truncate:
+        os.truncate = sandboxed_truncate
+    if original_os_utime:
+        os.utime = sandboxed_utime
+
+    # Wrap shutil if it's imported
+    try:
+        import shutil
+        original_shutil_rmtree = shutil.rmtree
+        original_shutil_copy = shutil.copy
+        original_shutil_copy2 = shutil.copy2
+        original_shutil_copytree = shutil.copytree
+        original_shutil_move = shutil.move
+
+        def sandboxed_rmtree(path, *args, **kwargs):
+            if is_path_protected(path):
+                raise create_security_error('rmtree', path)
+            return original_shutil_rmtree(path, *args, **kwargs)
+
+        def sandboxed_copy(src, dst, *args, **kwargs):
+            if is_path_protected(dst):
+                raise create_security_error('copy', dst)
+            return original_shutil_copy(src, dst, *args, **kwargs)
+
+        def sandboxed_copy2(src, dst, *args, **kwargs):
+            if is_path_protected(dst):
+                raise create_security_error('copy2', dst)
+            return original_shutil_copy2(src, dst, *args, **kwargs)
+
+        def sandboxed_copytree(src, dst, *args, **kwargs):
+            if is_path_protected(dst):
+                raise create_security_error('copytree', dst)
+            return original_shutil_copytree(src, dst, *args, **kwargs)
+
+        def sandboxed_move(src, dst, *args, **kwargs):
+            if is_path_protected(src):
+                raise create_security_error('move (source)', src)
+            if is_path_protected(dst):
+                raise create_security_error('move (destination)', dst)
+            return original_shutil_move(src, dst, *args, **kwargs)
+
+        shutil.rmtree = sandboxed_rmtree
+        shutil.copy = sandboxed_copy
+        shutil.copy2 = sandboxed_copy2
+        shutil.copytree = sandboxed_copytree
+        shutil.move = sandboxed_move
+    except ImportError:
+        pass
+
+    # Wrap pathlib.Path if available
+    try:
+        original_path_write_text = Path.write_text
+        original_path_write_bytes = Path.write_bytes
+        original_path_touch = Path.touch
+        original_path_mkdir = Path.mkdir
+        original_path_rmdir = Path.rmdir
+        original_path_unlink = Path.unlink
+        original_path_rename = Path.rename
+        original_path_replace = Path.replace
+        original_path_chmod = Path.chmod
+
+        def sandboxed_path_write_text(self, *args, **kwargs):
+            if is_path_protected(str(self)):
+                raise create_security_error('Path.write_text', str(self))
+            return original_path_write_text(self, *args, **kwargs)
+
+        def sandboxed_path_write_bytes(self, *args, **kwargs):
+            if is_path_protected(str(self)):
+                raise create_security_error('Path.write_bytes', str(self))
+            return original_path_write_bytes(self, *args, **kwargs)
+
+        def sandboxed_path_touch(self, *args, **kwargs):
+            if is_path_protected(str(self)):
+                raise create_security_error('Path.touch', str(self))
+            return original_path_touch(self, *args, **kwargs)
+
+        def sandboxed_path_mkdir(self, *args, **kwargs):
+            if is_path_protected(str(self)):
+                raise create_security_error('Path.mkdir', str(self))
+            return original_path_mkdir(self, *args, **kwargs)
+
+        def sandboxed_path_rmdir(self, *args, **kwargs):
+            if is_path_protected(str(self)):
+                raise create_security_error('Path.rmdir', str(self))
+            return original_path_rmdir(self, *args, **kwargs)
+
+        def sandboxed_path_unlink(self, *args, **kwargs):
+            if is_path_protected(str(self)):
+                raise create_security_error('Path.unlink', str(self))
+            return original_path_unlink(self, *args, **kwargs)
+
+        def sandboxed_path_rename(self, target, *args, **kwargs):
+            if is_path_protected(str(self)):
+                raise create_security_error('Path.rename (source)', str(self))
+            if is_path_protected(str(target)):
+                raise create_security_error('Path.rename (target)', str(target))
+            return original_path_rename(self, target, *args, **kwargs)
+
+        def sandboxed_path_replace(self, target, *args, **kwargs):
+            if is_path_protected(str(self)):
+                raise create_security_error('Path.replace (source)', str(self))
+            if is_path_protected(str(target)):
+                raise create_security_error('Path.replace (target)', str(target))
+            return original_path_replace(self, target, *args, **kwargs)
+
+        def sandboxed_path_chmod(self, *args, **kwargs):
+            if is_path_protected(str(self)):
+                raise create_security_error('Path.chmod', str(self))
+            return original_path_chmod(self, *args, **kwargs)
+
+        Path.write_text = sandboxed_path_write_text
+        Path.write_bytes = sandboxed_path_write_bytes
+        Path.touch = sandboxed_path_touch
+        Path.mkdir = sandboxed_path_mkdir
+        Path.rmdir = sandboxed_path_rmdir
+        Path.unlink = sandboxed_path_unlink
+        Path.rename = sandboxed_path_rename
+        Path.replace = sandboxed_path_replace
+        Path.chmod = sandboxed_path_chmod
+    except:
+        pass
diff --git a/shell/preload/sitecustomize.js b/shell/preload/sitecustomize.js
index dbb9198f..3b151d0b 100644
--- a/shell/preload/sitecustomize.js
+++ b/shell/preload/sitecustomize.js
@@ -1,3 +1,6 @@
+// Load sandbox first to protect filesystem
+require('./sandbox.js');
+
 const { execSync } = require('child_process');
 const client = require('./client.js');
 require(`./env.js`);
diff --git a/shell/preload/sitecustomize.py b/shell/preload/sitecustomize.py
index f4c51dd6..9e903948 100644
--- a/shell/preload/sitecustomize.py
+++ b/shell/preload/sitecustomize.py
@@ -1,3 +1,6 @@
+# Load sandbox first to protect filesystem
+import sandbox
+
 import os
 import re
 import subprocess
diff --git a/shell/preload/test_sandbox_direct.js b/shell/preload/test_sandbox_direct.js
new file mode 100644
index 00000000..2ce18f38
--- /dev/null
+++ b/shell/preload/test_sandbox_direct.js
@@ -0,0 +1,43 @@
+// Minimal test of sandbox module
+const path = require('path');
+
+// Set up environment
+process.env.QL_DIR = path.join(__dirname, '../..');
+process.env.QL_DATA_DIR = path.join(__dirname, '../../data');
+
+// Load sandbox
+require('./sandbox.js');
+
+const fs = require('fs');
+
+console.log("Testing filesystem sandbox...\n");
+
+// Test 1: Try to write to config directory (should fail)
+console.log("Test 1: Attempting to write to config/test.txt (should fail)...");
+try {
+  const configPath = path.join(__dirname, '../../data/config/test.txt');
+  fs.writeFileSync(configPath, 'test');
+  console.log("❌ FAILED: Was able to write to protected config directory!");
+  process.exit(1);
+} catch (error) {
+  if (error.code === 'EACCES' && error.message.includes('Security Error')) {
+    console.log("✅ PASSED: Correctly blocked write to config directory");
+    console.log("Error message:", error.message.split('\n')[0]);
+  } else {
+    console.log("❓ UNEXPECTED ERROR:", error.message);
+  }
+}
+
+// Test 2: Write to scripts directory (should succeed)
+console.log("\nTest 2: Attempting to write to scripts directory (should succeed)...");
+try {
+  const scriptsPath = path.join(__dirname, '../../data/scripts/test_output.txt');
+  fs.writeFileSync(scriptsPath, 'This is a test file');
+  console.log("✅ PASSED: Successfully wrote to scripts directory");
+  fs.unlinkSync(scriptsPath);
+} catch (error) {
+  console.log("❌ FAILED: Could not write to allowed scripts directory:", error.message);
+  process.exit(1);
+}
+
+console.log("\n✅ Basic sandbox tests passed!");
diff --git a/shell/preload/test_sandbox_direct.py b/shell/preload/test_sandbox_direct.py
new file mode 100644
index 00000000..901737a1
--- /dev/null
+++ b/shell/preload/test_sandbox_direct.py
@@ -0,0 +1,50 @@
+#!/usr/bin/env python3
+# Minimal test of Python sandbox module
+import os
+import sys
+from pathlib import Path
+
+# Set up environment
+script_dir = Path(__file__).parent.resolve()
+ql_dir = script_dir.parent.parent
+os.environ['QL_DIR'] = str(ql_dir)
+os.environ['QL_DATA_DIR'] = str(ql_dir / 'data')
+
+# Add preload to path
+sys.path.insert(0, str(script_dir))
+
+# Load sandbox
+import sandbox
+
+print("Testing Python filesystem sandbox...\n")
+
+# Test 1: Try to write to config directory (should fail)
+print("Test 1: Attempting to write to config/test.txt (should fail)...")
+try:
+    config_path = ql_dir / 'data' / 'config' / 'test.txt'
+    with open(config_path, 'w') as f:
+        f.write('test')
+    print("❌ FAILED: Was able to write to protected config directory!")
+    sys.exit(1)
+except PermissionError as e:
+    if 'Security Error' in str(e):
+        print("✅ PASSED: Correctly blocked write to config directory")
+        print(f"Error message: {str(e).split(chr(10))[0]}")
+    else:
+        print(f"❓ UNEXPECTED ERROR: {e}")
+except Exception as e:
+    print(f"❓ UNEXPECTED ERROR: {e}")
+
+# Test 2: Write to scripts directory (should succeed)
+print("\nTest 2: Attempting to write to scripts directory (should succeed)...")
+try:
+    scripts_path = ql_dir / 'data' / 'scripts' / 'test_output.txt'
+    with open(scripts_path, 'w') as f:
+        f.write('This is a test file')
+    print("✅ PASSED: Successfully wrote to scripts directory")
+    os.remove(scripts_path)
+except Exception as e:
+    print(f"❌ FAILED: Could not write to allowed scripts directory: {e}")
+    sys.exit(1)
+
+print("\n✅ Basic Python sandbox tests passed!")