diff --git a/codewiki/cli/utils/repo_validator.py b/codewiki/cli/utils/repo_validator.py
index 3e17d031..84e81c1c 100644
--- a/codewiki/cli/utils/repo_validator.py
+++ b/codewiki/cli/utils/repo_validator.py
@@ -4,12 +4,16 @@
 
 from pathlib import Path
 from typing import Tuple, List
+import logging
 import os
 
 from codewiki.cli.utils.errors import RepositoryError
 from codewiki.cli.utils.validation import validate_repository_path, detect_supported_languages
 
 
+logger = logging.getLogger(__name__)
+
+
 # Supported file extensions by language
 SUPPORTED_EXTENSIONS = {
     '.py',      # Python
@@ -146,6 +150,7 @@ def get_git_commit_hash(repo_path: Path) -> str:
         repo = git.Repo(repo_path)
         return repo.head.commit.hexsha
     except Exception:
+        logger.debug("Failed to read git commit hash for %s", repo_path, exc_info=True)
         return ""
 
 
@@ -167,6 +172,7 @@ def get_git_branch(repo_path: Path) -> str:
         repo = git.Repo(repo_path)
         return repo.active_branch.name
     except Exception:
+        logger.debug("Failed to read git branch for %s", repo_path, exc_info=True)
         return ""
 
 
diff --git a/codewiki/src/fe/github_processor.py b/codewiki/src/fe/github_processor.py
index a31ce6b8..53fb33e6 100644
--- a/codewiki/src/fe/github_processor.py
+++ b/codewiki/src/fe/github_processor.py
@@ -71,6 +71,8 @@ def clone_repository(clone_url: str, target_dir: str, commit_id: str = None) ->
                 
                 if result.returncode != 0:
                     logger.error(f"Error cloning repository: {result.stderr}")
+                    if os.path.isdir(target_dir):
+                        shutil.rmtree(target_dir, ignore_errors=True)
                     return False
                 
                 # Checkout specific commit
@@ -91,6 +93,8 @@ def clone_repository(clone_url: str, target_dir: str, commit_id: str = None) ->
                 
                 if result.returncode != 0:
                     logger.error(f"Error cloning repository: {result.stderr}")
+                    if os.path.isdir(target_dir):
+                        shutil.rmtree(target_dir, ignore_errors=True)
                     return False
             
             return True
@@ -99,3 +103,4 @@ def clone_repository(clone_url: str, target_dir: str, commit_id: str = None) ->
             if os.path.isdir(target_dir):
                 shutil.rmtree(target_dir, ignore_errors=True)
             return False
+
diff --git a/codewiki/src/fe/routes.py b/codewiki/src/fe/routes.py
index 4750c21c..5f110462 100644
--- a/codewiki/src/fe/routes.py
+++ b/codewiki/src/fe/routes.py
@@ -242,10 +242,19 @@ async def serve_generated_docs(self, job_id: str, filename: str = "overview.md")
                 pass
         
         # Serve the requested file
-        docs_path_resolved = docs_path.resolve()
-        file_path = (docs_path / filename).resolve()
-        if docs_path_resolved != file_path and docs_path_resolved not in file_path.parents:
+        if not filename.endswith('.md'):
             raise HTTPException(status_code=400, detail="Invalid file path")
+
+        try:
+            docs_path_resolved = docs_path.resolve()
+            file_path = (docs_path / filename).resolve()
+            if not file_path.is_relative_to(docs_path_resolved):
+                raise HTTPException(status_code=400, detail="Invalid file path")
+        except HTTPException:
+            raise
+        except Exception:
+            raise HTTPException(status_code=400, detail="Invalid file path")
+
         if not file_path.exists():
             raise HTTPException(status_code=404, detail=f"File {filename} not found")
         
@@ -304,3 +313,4 @@ def cleanup_old_jobs(self):
         for job_id in expired_jobs:
             if job_id in self.background_worker.job_status:
                 del self.background_worker.job_status[job_id]
+