diff --git a/server.py b/server.py
index 3abe7ae..0f7d15a 100644
--- a/server.py
+++ b/server.py
@@ -94,6 +94,23 @@ async def get_morningstar_data(ticker: str, debug: bool = False) -> str:
     result = await api.get_morningstar_data(ticker, debug=debug)
     return json.dumps(result)
 
+@mcp.tool()
+async def upload_cookies(cookies_json: str) -> str:
+    """Upload session cookies to the server to assist with authentication.
+    
+    Args:
+        cookies_json: JSON string of cookies exported from a browser (Playwright format)
+    """
+    try:
+        # Validate JSON
+        cookies = json.loads(cookies_json)
+        # Write to cookies.json
+        with open("cookies.json", "w") as f:
+            json.dump(cookies, f)
+        return json.dumps({"status": "success", "message": "cookies.json updated successfully"})
+    except Exception as e:
+        return json.dumps({"status": "error", "message": str(e)})
+
 @mcp.tool()
 async def api_call(endpoint: str, method: str = "GET", params: str = "{}") -> str:
     """Executes a raw API call to the Schwab service (Dummy implementation).