diff --git a/app.js b/app.js
index 104d33b..c0b96aa 100644
--- a/app.js
+++ b/app.js
@@ -48,6 +48,10 @@ var console = {
         if (this._muted) return;
         
         if (typeof WScript !== "undefined") {
+            if (this._muted) {
+                WScript.StdErr.WriteLine("[*] " + params.message);
+                return;
+            }
             WScript.StdOut.WriteLine("[*] " + params.message);
         }
     },
diff --git a/lib/jsonrpc2.js b/lib/jsonrpc2.js
index 6186e3e..d1d2f8e 100644
--- a/lib/jsonrpc2.js
+++ b/lib/jsonrpc2.js
@@ -39,52 +39,52 @@ function JsonRpc2(url) {
 }
 
 function extract(message, callback) {
-	var data;
-	
-	if (typeof callback !== "function") {
-		throw new Error("Invalid callback");
-	}
-	
-	try {
-		data = JSON.parse(message);
-	} catch (e) {
-		throw new Error("Invalid JSON: " + e.message);
-	}
-	
-	if (!data || typeof data !== "object") {
-		throw new Error("Invalid request object");
-	}
-	
-	if (data.jsonrpc !== "2.0") {
-		throw new Error("Invalid JSON-RPC version");
-	}
-	
-	if (!data.method || typeof data.method !== "string") {
-		throw new Error("Missing or invalid method");
-	}
-	
-	var params = data.params !== undefined ? data.params : null;
-	var id = data.id !== undefined ? data.id : null;
-	
-	try {
-		var result = callback(data.method, params, id);
-		
-		return {
-			jsonrpc: "2.0",
-			result: result === undefined ? null : result,
-			id: id
-		};
-		
-	} catch (e) {
-		return {
-			jsonrpc: "2.0",
-			error: {
-				code: -32603,
-				message: e && e.message ? e.message : "Internal error"
-			},
-			id: id
-		};
-	}
+    var data;
+    
+    if (typeof callback !== "function") {
+        throw new Error("Invalid callback");
+    }
+    
+    try {
+        data = JSON.parse(message);
+    } catch (e) {
+        throw new Error("Invalid JSON: " + e.message);
+    }
+    
+    if (!data || typeof data !== "object") {
+        throw new Error("Invalid request object");
+    }
+    
+    if (data.jsonrpc !== "2.0") {
+        throw new Error("Invalid JSON-RPC version");
+    }
+    
+    if (!data.method || typeof data.method !== "string") {
+        throw new Error("Missing or invalid method");
+    }
+    
+    var params = data.params !== undefined ? data.params : null;
+    var id = data.id !== undefined ? data.id : null;
+    
+    try {
+        var result = callback(data.method, params, id);
+        
+        return {
+            jsonrpc: "2.0",
+            result: result === undefined ? null : result,
+            id: id
+        };
+        
+    } catch (e) {
+        return {
+            jsonrpc: "2.0",
+            error: {
+                code: -32603,
+                message: e && e.message ? e.message : "Internal error"
+            },
+            id: id
+        };
+    }
 }
 
 function wrap(method, params, id) {
@@ -108,7 +108,7 @@ exports.create = create;
 
 exports.DEFAULT_JSONRPC2_URL = DEFAULT_JSONRPC2_URL;
 
-exports.VERSIONINFO = "JSON-RPC 2.0 wrapper (jsonrpc2.js) version 0.1.6";
+exports.VERSIONINFO = "JSON-RPC 2.0 wrapper (jsonrpc2.js) version 0.1.7";
 exports.AUTHOR = "gnh1201@catswords.re.kr";
 exports.global = global;
 exports.require = global.require;
diff --git a/lib/stdio-server.js b/lib/stdio-server.js
index 54faf96..2f05d90 100644
--- a/lib/stdio-server.js
+++ b/lib/stdio-server.js
@@ -16,6 +16,13 @@ function StdioServer() {
     };
     
     this.send = function (message) {
+        if (typeof message === "object") {
+            try {
+                var _serialized = JSON.stringify(message);
+                message = _serialized;
+            } catch (e) { /* ignore */ };
+        }
+        
         WScript.StdOut.WriteLine(message);
     };
     
diff --git a/mcploader.js b/mcploader.js
index 05b37d8..13e5055 100644
--- a/mcploader.js
+++ b/mcploader.js
@@ -7,24 +7,78 @@ var StdioServer = require("lib/stdio-server");
 var JsonRpc2 = require("lib/jsonrpc2");
 
 function main(args) {
-	var server = StdioServer.create();
+    var server = StdioServer.create();
 
-	server.addEventListener("message", function(e) {
-		var message = e.target.receive();
-		
-		try {
-			JsonRpc2.extract(message, function(method, params, id) {
-				console.log("Received method: " + method);
-			});
-		} catch (e) {
-			console.log("Ignored");
-		}
-		
-		// send message 
-		e.target.send("Hello world");
-	});
+    server.addEventListener("message", function(e) {
+        var message = e.target.receive();
 
-	server.listen();
+        e.target.send(
+            JsonRpc2.extract(message, function (method, params, id) {
+                if (method == "initialize") {
+                    return {
+                        "protocolVersion": "2025-11-25",
+                        "capabilities": {
+                            "extensions": {
+                                "io.modelcontextprotocol/ui": {
+                                    "mimeTypes": ["text/html;profile=mcp-app"]
+                                }
+                            }
+                        },
+                        "serverInfo": {
+                            "name": "WelsonJS MCP",
+                            "version": "1.0.0"
+                        }
+                    };
+                }
+                
+                if (method == "tools/list") {
+                    return {
+                        "tools": [
+                            {
+                                "name": "add_both_numbers",
+                                "title": "add both_numbers (add A and B)",
+                                "description": "add two numbers (add A and B)",
+                                "inputSchema": {
+                                    "type": "object",
+                                    "properties": {
+                                        "a": {
+                                            "type": "number"
+                                        },
+                                        "b": {
+                                            "type": "number"
+                                        }
+                                    },
+                                    "required": ["a", "b"]
+                                }
+                            }
+                        ]
+                    };
+                }
+
+                if (method == "tools/call") {
+                    var function_calling_name = params.name;
+
+                    if (function_calling_name == "add_both_numbers") {
+                        return {
+                            "content": [
+                                {
+                                    "type": "text",
+                                    "text": "Result is " + (parseFloat(params.arguments.a) + parseFloat(params.arguments.b))
+                                }
+                            ],
+                            "isError": false
+                        };
+                    }
+                }
+
+                return {
+                    "isError": true
+                };
+            })
+        );
+    });
+
+    server.listen();
 }
 
 exports.main = main;