diff --git a/src/seclab_taskflows/mcp_servers/gh_file_viewer.py b/src/seclab_taskflows/mcp_servers/gh_file_viewer.py
index f138a43..ea9a40c 100644
--- a/src/seclab_taskflows/mcp_servers/gh_file_viewer.py
+++ b/src/seclab_taskflows/mcp_servers/gh_file_viewer.py
@@ -126,6 +126,9 @@ async def fetch_file_from_gh(
     """
     Fetch the content of a file from a GitHub repository.
     """
+    owner = owner.lower()
+    repo = repo.lower()
+
     r = await call_api(
         url=f"https://api.github.com/repos/{owner}/{repo}/contents/{path}",
         params={}
@@ -146,6 +149,9 @@ async def get_file_lines_from_gh(
     length: int = Field(description="The ending line number to fetch from the file", default=10)) -> str:
     """Fetch a range of lines from a file in a GitHub repository.
     """
+    owner = owner.lower()
+    repo = repo.lower()
+
     r = await call_api(
         url=f"https://api.github.com/repos/{owner}/{repo}/contents/{path}",
         params={}
@@ -171,6 +177,9 @@ async def search_file_from_gh(
     """
     Search for a term in a file from a GitHub repository.
     """
+    owner = owner.lower()
+    repo = repo.lower()
+
     r = await call_api(
         url=f"https://api.github.com/repos/{owner}/{repo}/contents/{path}",
         params={}
@@ -193,6 +202,9 @@ async def search_files_from_gh(
     """
     Search for a term in a list of files from a GitHub repository.
     """
+    owner = owner.lower()
+    repo = repo.lower()
+
     paths_list = [path.strip() for path in paths.split(',')]
     if not paths_list:
         return "No paths provided for search."
@@ -238,6 +250,9 @@ async def list_directory_from_gh(
     """
     Fetch the content of a directory from a GitHub repository.
     """
+    owner = owner.lower()
+    repo = repo.lower()
+
     r = await call_api(
         url=f"https://api.github.com/repos/{owner}/{repo}/contents/{path}",
         params={}
@@ -259,6 +274,9 @@ async def search_repo_from_gh(
     """
     Search for the search term in the entire repository.
     """
+    owner = owner.lower()
+    repo = repo.lower()
+    
     with tempfile.TemporaryDirectory() as tmp_dir:
         result = await _fetch_source_zip(owner, repo, tmp_dir)
         source_path = Path(f"{tmp_dir}/{owner}/{repo}.zip")
diff --git a/src/seclab_taskflows/mcp_servers/local_file_viewer.py b/src/seclab_taskflows/mcp_servers/local_file_viewer.py
index 1e3c170..4dd73bc 100644
--- a/src/seclab_taskflows/mcp_servers/local_file_viewer.py
+++ b/src/seclab_taskflows/mcp_servers/local_file_viewer.py
@@ -111,6 +111,9 @@ async def fetch_file_content(
     """
     Fetch the content of a file from a local GitHub repository.
     """
+    owner = owner.lower()
+    repo = repo.lower()
+
     source_path = Path(f"{LOCAL_GH_DIR}/{owner}/{repo}.zip")
     source_path = sanitize_file_path(source_path, [LOCAL_GH_DIR])
     if not source_path or not source_path.exists():
@@ -133,6 +136,9 @@ async def get_file_lines(
     length: int = Field(description="The ending line number to fetch from the file", default=10)) -> str:
     """Fetch a range of lines from a file in a local GitHub repository.
     """
+    owner = owner.lower()
+    repo = repo.lower()
+
     source_path = Path(f"{LOCAL_GH_DIR}/{owner}/{repo}.zip")
     source_path = sanitize_file_path(source_path, [LOCAL_GH_DIR])
     if not source_path or not source_path.exists():
@@ -155,6 +161,9 @@ async def list_files(
     """
     Recursively list the files of a directory from a local GitHub repository.
     """
+    owner = owner.lower()
+    repo = repo.lower()
+
     source_path = Path(f"{LOCAL_GH_DIR}/{owner}/{repo}.zip")
     source_path = sanitize_file_path(source_path, [LOCAL_GH_DIR])
     if not source_path or not source_path.exists():
@@ -173,6 +182,9 @@ async def list_files_non_recursive(
     List the files of a directory from a local GitHub repository non-recursively.
     Subdirectories will be listed and indicated with a trailing slash.
     """
+    owner = owner.lower()
+    repo = repo.lower()
+
     source_path = Path(f"{LOCAL_GH_DIR}/{owner}/{repo}.zip")
     source_path = sanitize_file_path(source_path, [LOCAL_GH_DIR])
     if not source_path or not source_path.exists():
@@ -191,6 +203,9 @@ async def search_repo(
     """
     Search for the search term in the repository or a subdirectory/file in the repository.
     """
+    owner = owner.lower()
+    repo = repo.lower()
+
     source_path = Path(f"{LOCAL_GH_DIR}/{owner}/{repo}.zip")
     source_path = sanitize_file_path(source_path, [LOCAL_GH_DIR])
     if not source_path or not source_path.exists():
diff --git a/src/seclab_taskflows/mcp_servers/local_gh_resources.py b/src/seclab_taskflows/mcp_servers/local_gh_resources.py
index 6c3b17c..3c48ad6 100644
--- a/src/seclab_taskflows/mcp_servers/local_gh_resources.py
+++ b/src/seclab_taskflows/mcp_servers/local_gh_resources.py
@@ -95,6 +95,9 @@ async def fetch_repo_from_gh(
     """
     Download the source code from GitHub to the local file system to speed up file search.
     """
+    owner = owner.lower()
+    repo = repo.lower()
+
     result = await _fetch_source_zip(owner, repo, LOCAL_GH_DIR)
     source_path = Path(f"{LOCAL_GH_DIR}/{owner}/{repo}.zip")
     if not source_path.exists():
@@ -106,6 +109,9 @@ async def clear_local_repo(owner: str, repo: str):
     """
     Delete the local repo.
     """
+    owner = owner.lower()
+    repo = repo.lower()
+
     source_path = Path(f"{LOCAL_GH_DIR}/{owner}/{repo}.zip")
     source_path = sanitize_file_path(source_path, [LOCAL_GH_DIR])
     if not source_path: