diff --git a/src/summary_cache.py b/src/summary_cache.py
index 233d05db..b68f8c27 100644
--- a/src/summary_cache.py
+++ b/src/summary_cache.py
@@ -4,6 +4,8 @@ import json
 from pathlib import Path
 from typing  import Optional, Dict
 
+from src.result_types import Result, ErrorInfo, ErrorKind
+
 
 def get_file_hash(content: str) -> str:
  """
@@ -27,26 +29,30 @@ class SummaryCache:
   self.cache: Dict[str, Dict[str, str]] = {}
   self.load()
 
- def load(self) -> None:
+ def load(self) -> Result[bool]:
   """
   Loads cache from disk.
   [C: src/tool_presets.py:ToolPresetManager._read_raw, src/workspace_manager.py:WorkspaceManager._load_file, tests/test_gui_phase3.py:test_create_track, tests/test_history_management.py:test_save_separation, tests/test_session_logging.py:test_open_session_creates_subdir_and_registry]
   """
-  if self.cache_file.exists():
-   try:
-    with open(self.cache_file, "r", encoding="utf-8") as f:
-     self.cache = json.load(f)
-   except Exception:
-    self.cache = {}
+  if not self.cache_file.exists():
+   return Result(data=False)
+  try:
+   with open(self.cache_file, "r", encoding="utf-8") as f:
+    self.cache = json.load(f)
+   return Result(data=True)
+  except (OSError, json.JSONDecodeError) as e:
+   self.cache = {}
+   return Result(data=False, errors=[ErrorInfo(kind=ErrorKind.INTERNAL, message=str(e), source="summary_cache.load", original=e)])
 
- def save(self) -> None:
+ def save(self) -> Result[bool]:
   """Saves cache to disk."""
   try:
    self.cache_file.parent.mkdir(parents=True, exist_ok=True)
    with open(self.cache_file, "w", encoding="utf-8") as f:
     json.dump(self.cache, f, indent=1)
-  except Exception:
-   pass
+   return Result(data=True)
+  except OSError as e:
+   return Result(data=False, errors=[ErrorInfo(kind=ErrorKind.INTERNAL, message=str(e), source="summary_cache.save", original=e)])
 
  def get_summary(self, file_path: str, content_hash: str) -> Optional[str]:
   """
@@ -79,27 +85,29 @@ class SummaryCache:
    self.cache.pop(first_key)
   self.save()
 
- def clear(self) -> None:
+ def clear(self) -> Result[bool]:
   """
   Clears the cache both in-memory and on disk.
   [C: tests/conftest.py:reset_ai_client]
   """
   self.cache.clear()
-  if self.cache_file.exists():
-   try:
-    self.cache_file.unlink()
-   except Exception:
-    pass
+  if not self.cache_file.exists():
+   return Result(data=True)
+  try:
+   self.cache_file.unlink()
+   return Result(data=True)
+  except OSError as e:
+   return Result(data=False, errors=[ErrorInfo(kind=ErrorKind.INTERNAL, message=str(e), source="summary_cache.clear", original=e)])
 
- def get_stats(self) -> dict:
+ def get_stats(self) -> Result[dict]:
   """Returns dictionary of cache statistics."""
   size_bytes = 0
   if self.cache_file.exists():
    try:
     size_bytes = self.cache_file.stat().st_size
-   except Exception:
-    pass
-  return {
+   except OSError as e:
+    return Result(data={"entries": len(self.cache), "size_bytes": 0}, errors=[ErrorInfo(kind=ErrorKind.INTERNAL, message=str(e), source="summary_cache.get_stats", original=e)])
+  return Result(data={
    "entries": len(self.cache),
    "size_bytes": size_bytes
-  }
+  })