feat: Add MCP integration to enable tools from skills.sh and other MCP servers

- Added MCP client to discover and convert MCP tools to LangChain Tools
- Extended configuration manager to support MCP server configurations
- Updated CLI to manage MCP server configurations (list, add, remove, use)
- Integrated MCP tools into the agent's tool loading system
- Added documentation for MCP integration design

main.py

@@ -72,6 +72,59 @@ def load_model_from_config():
         return init_chat_model(f"openai:{model_name}")
 
 
+def get_mcp_tools() -> List[Tool]:
+    """
+    Get MCP tools from configured MCP servers
+    
+    Returns:
+        List of MCP-derived LangChain Tool objects
+    """
+    from mcp_client import MCPClient, get_mcp_tools_from_client
+    
+    mcp_tools = []
+    
+    if not CONFIG_AVAILABLE:
+        return mcp_tools
+    
+    try:
+        # Get all MCP server configurations
+        # We'll look for configurations with provider="mcp"
+        all_configs = config_manager.get_configurations()
+        mcp_configs = {
+            name: config for name, config in all_configs.items()
+            if config.get("provider") == "mcp"
+        }
+        
+        for name, config in mcp_configs.items():
+            try:
+                server_url = config.get("server_url")
+                if not server_url:
+                    print(f"⚠️  MCP configuration '{name}' missing server_url")
+                    continue
+                
+                headers = {}
+                api_key = config.get("api_key")
+                if api_key:
+                    headers["Authorization"] = f"Bearer {api_key}"
+                
+                mcp_client = MCPClient(
+                    server_url=server_url,
+                    headers=headers,
+                    timeout=config.get("timeout", 30)
+                )
+                
+                tools = get_mcp_tools_from_client(mcp_client)
+                mcp_tools.extend(tools)
+                print(f"✅ Added {len(tools)} tools from MCP server '{name}'")
+            except Exception as e:
+                print(f"⚠️  Could not load tools from MCP server '{name}': {e}")
+    
+    except Exception as e:
+        print(f"⚠️  Error loading MCP tools: {e}")
+    
+    return mcp_tools
+
+
 def get_custom_tools() -> List[Tool]:
     """
     Get custom tools for the LangCode agent
@@ -111,6 +164,14 @@ def get_custom_tools() -> List[Tool]:
     except Exception as e:
         print(f"⚠️  Could not load provider tools: {e}")
     
+    # Add MCP tools from configured servers
+    try:
+        mcp_tools = get_mcp_tools()
+        custom_tools.extend(mcp_tools)
+        print(f"✅ Added {len(mcp_tools)} MCP tools")
+    except Exception as e:
+        print(f"⚠️  Could not load MCP tools: {e}")
+    
     return custom_tools