docs: Add path sanitization for model-generated file paths

Co-authored-by: George Weale <gweale@google.com>
PiperOrigin-RevId: 834344352

contributing/samples/adk_agent_builder_assistant/tools/write_config_files.py

@@ -31,6 +31,7 @@ import jsonschema
 import yaml
 
 from ..utils import load_agent_config_schema
+from ..utils.path_normalizer import sanitize_generated_file_path
 from ..utils.resolve_root_directory import resolve_file_path
 from .write_files import write_files
 
@@ -177,8 +178,9 @@ async def write_config_files(
 
   # Step 1: Validate all configs before writing any files
   for file_path, config_content in configs.items():
+    normalized_input_path = sanitize_generated_file_path(file_path)
     file_result = _validate_single_config(
-        file_path, config_content, project_folder_name
+        normalized_input_path, config_content, project_folder_name
     )
     result["files"][file_path] = file_result
 
@@ -197,7 +199,7 @@ async def write_config_files(
           rename_applied,
           sanitized_name,
           rename_warning,
-      ) = _determine_target_file_path(file_path, agent_name)
+      ) = _determine_target_file_path(normalized_input_path, agent_name)
 
       file_result["target_file_path"] = target_path
       file_result["rename_applied"] = rename_applied

contributing/samples/adk_agent_builder_assistant/utils/path_normalizer.py

@@ -0,0 +1,60 @@
+# Copyright 2025 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Helpers for normalizing file path strings produced by the model."""
+
+from __future__ import annotations
+
+import re
+
+_SEGMENT_SPLIT_PATTERN = re.compile(r"([/\\])")
+_BOUNDARY_CHARS = " \t\r\n'\"`"
+
+
+def sanitize_generated_file_path(file_path: str) -> str:
+  """Strip stray quotes/whitespace around each path segment.
+
+  The agent occasionally emits quoted paths such as `'tools/web.yaml'` which
+  would otherwise create directories literally named `'<name>`. This helper
+  removes leading/trailing whitespace and quote-like characters from the path
+  and from each path component while preserving intentional interior
+  characters.
+
+  Args:
+    file_path: Path string provided by the model or user.
+
+  Returns:
+    Sanitized path string safe to feed into pathlib.Path.
+  """
+  if not isinstance(file_path, str):
+    file_path = str(file_path)
+
+  trimmed = file_path.strip()
+  if not trimmed:
+    return trimmed
+
+  segments = _SEGMENT_SPLIT_PATTERN.split(trimmed)
+  sanitized_segments: list[str] = []
+
+  for segment in segments:
+    if not segment:
+      sanitized_segments.append(segment)
+      continue
+    if segment in ("/", "\\"):
+      sanitized_segments.append(segment)
+      continue
+    sanitized_segments.append(segment.strip(_BOUNDARY_CHARS))
+
+  sanitized = "".join(sanitized_segments).strip(_BOUNDARY_CHARS)
+  return sanitized or trimmed

contributing/samples/adk_agent_builder_assistant/utils/resolve_root_directory.py

@@ -21,6 +21,8 @@ from typing import Dict
 from typing import List
 from typing import Optional
 
+from .path_normalizer import sanitize_generated_file_path
+
 
 def resolve_file_path(
     file_path: str,
@@ -40,7 +42,8 @@ def resolve_file_path(
   Returns:
     Resolved absolute Path object
   """
-  file_path_obj = Path(file_path)
+  normalized_path = sanitize_generated_file_path(file_path)
+  file_path_obj = Path(normalized_path)
 
   # If already absolute, use as-is
   if file_path_obj.is_absolute():
@@ -63,7 +66,7 @@ def resolve_file_path(
       resolved_root = Path(os.getcwd()) / root_directory
 
   # Resolve file path relative to root directory
-  return resolved_root / file_path
+  return resolved_root / file_path_obj
 
 
 def resolve_file_paths(