diff --git a/src/skill_seekers/mcp/server.py b/src/skill_seekers/mcp/server.py
index 27686fd..73a9c5b 100644
--- a/src/skill_seekers/mcp/server.py
+++ b/src/skill_seekers/mcp/server.py
@@ -7,6 +7,7 @@ Model Context Protocol server for generating Claude AI skills from documentation
 import asyncio
 import json
 import os
+import re
 import subprocess
 import sys
 import time
@@ -1274,6 +1275,25 @@ async def submit_config_tool(args: dict) -> list[TextContent]:
             is_unified = validator.is_unified
             config_name = config_data.get("name", "unnamed")
 
+            # Additional format validation (ConfigValidator only checks structure)
+            # Validate name format (alphanumeric, hyphens, underscores only)
+            if not re.match(r'^[a-zA-Z0-9_-]+$', config_name):
+                raise ValueError(f"Invalid name format: '{config_name}'\nNames must contain only alphanumeric characters, hyphens, and underscores")
+
+            # Validate URL formats
+            if not is_unified:
+                # Legacy config - check base_url
+                base_url = config_data.get('base_url', '')
+                if base_url and not (base_url.startswith('http://') or base_url.startswith('https://')):
+                    raise ValueError(f"Invalid base_url format: '{base_url}'\nURLs must start with http:// or https://")
+            else:
+                # Unified config - check URLs in sources
+                for idx, source in enumerate(config_data.get('sources', [])):
+                    if source.get('type') == 'documentation':
+                        source_url = source.get('base_url', '')
+                        if source_url and not (source_url.startswith('http://') or source_url.startswith('https://')):
+                            raise ValueError(f"Source {idx} (documentation): Invalid base_url format: '{source_url}'\nURLs must start with http:// or https://")
+
         except ValueError as validation_error:
             # Provide detailed validation feedback
             error_msg = f"""❌ Config validation failed:
diff --git a/tests/test_mcp_server.py b/tests/test_mcp_server.py
index 3093e08..44782cb 100644
--- a/tests/test_mcp_server.py
+++ b/tests/test_mcp_server.py
@@ -634,7 +634,8 @@ class TestSubmitConfigTool(unittest.IsolatedAsyncioTestCase):
         }
         result = await skill_seeker_server.submit_config_tool(args)
         self.assertIn("validation failed", result[0].text.lower())
-        self.assertIn("description", result[0].text)
+        # ConfigValidator detects missing config type (base_url/repo/pdf)
+        self.assertTrue("cannot detect" in result[0].text.lower() or "missing" in result[0].text.lower())
 
     async def test_submit_config_validates_name_format(self):
         """Should reject invalid name characters"""