diff --git a/src/boxes/http_server_box.rs b/src/boxes/http_server_box.rs
index 6b1cc52a..7edaaada 100644
--- a/src/boxes/http_server_box.rs
+++ b/src/boxes/http_server_box.rs
@@ -45,7 +45,7 @@ use crate::boxes::{SocketBox, MapBox, ArrayBox};
 use crate::boxes::http_message_box::{HTTPRequestBox, HTTPResponseBox};
 use crate::boxes::future::FutureBox;
 use std::any::Any;
-use std::sync::{Arc, Mutex};
+use std::sync::RwLock;
 use std::collections::HashMap;
 use std::thread;
 
@@ -53,26 +53,35 @@ use std::thread;
 #[derive(Debug)]
 pub struct HTTPServerBox {
     base: BoxBase,
-    socket: Arc<Mutex<Option<SocketBox>>>,
-    routes: Arc<Mutex<HashMap<String, Box<dyn NyashBox>>>>,
-    middleware: Arc<Mutex<Vec<Box<dyn NyashBox>>>>,
-    running: Arc<Mutex<bool>>,
-    static_path: Arc<Mutex<Option<String>>>,
-    timeout_seconds: Arc<Mutex<u64>>,
-    active_connections: Arc<Mutex<Vec<Box<dyn NyashBox>>>>,
+    socket: RwLock<Option<SocketBox>>,
+    routes: RwLock<HashMap<String, Box<dyn NyashBox>>>,
+    middleware: RwLock<Vec<Box<dyn NyashBox>>>,
+    running: RwLock<bool>,
+    static_path: RwLock<Option<String>>,
+    timeout_seconds: RwLock<u64>,
+    active_connections: RwLock<Vec<Box<dyn NyashBox>>>,
 }
 
 impl Clone for HTTPServerBox {
     fn clone(&self) -> Self {
+        // State-preserving clone implementation following PR #87 pattern
+        let socket_val = self.socket.read().unwrap().clone();
+        let routes_val = self.routes.read().unwrap().clone();
+        let middleware_val = self.middleware.read().unwrap().clone();
+        let running_val = *self.running.read().unwrap();
+        let static_path_val = self.static_path.read().unwrap().clone();
+        let timeout_val = *self.timeout_seconds.read().unwrap();
+        let connections_val = self.active_connections.read().unwrap().clone();
+        
         Self {
             base: BoxBase::new(), // New unique ID for clone
-            socket: Arc::clone(&self.socket),
-            routes: Arc::clone(&self.routes),
-            middleware: Arc::clone(&self.middleware),
-            running: Arc::clone(&self.running),
-            static_path: Arc::clone(&self.static_path),
-            timeout_seconds: Arc::clone(&self.timeout_seconds),
-            active_connections: Arc::clone(&self.active_connections),
+            socket: RwLock::new(socket_val),
+            routes: RwLock::new(routes_val),
+            middleware: RwLock::new(middleware_val),
+            running: RwLock::new(running_val),
+            static_path: RwLock::new(static_path_val),
+            timeout_seconds: RwLock::new(timeout_val),
+            active_connections: RwLock::new(connections_val),
         }
     }
 }
@@ -81,13 +90,13 @@ impl HTTPServerBox {
     pub fn new() -> Self {
         Self {
             base: BoxBase::new(),
-            socket: Arc::new(Mutex::new(None)),
-            routes: Arc::new(Mutex::new(HashMap::new())),
-            middleware: Arc::new(Mutex::new(Vec::new())),
-            running: Arc::new(Mutex::new(false)),
-            static_path: Arc::new(Mutex::new(None)),
-            timeout_seconds: Arc::new(Mutex::new(30)),
-            active_connections: Arc::new(Mutex::new(Vec::new())),
+            socket: RwLock::new(None),
+            routes: RwLock::new(HashMap::new()),
+            middleware: RwLock::new(Vec::new()),
+            running: RwLock::new(false),
+            static_path: RwLock::new(None),
+            timeout_seconds: RwLock::new(30),
+            active_connections: RwLock::new(Vec::new()),
         }
     }
     
@@ -97,7 +106,7 @@ impl HTTPServerBox {
         let bind_result = socket.bind(address, port);
         
         if bind_result.to_string_box().value == "true" {
-            match self.socket.lock() {
+            match self.socket.write() {
                 Ok(mut socket_guard) => {
                     *socket_guard = Some(socket);
                     Box::new(BoolBox::new(true))
@@ -113,7 +122,7 @@ impl HTTPServerBox {
     
     /// 接続待機開始
     pub fn listen(&self, backlog: Box<dyn NyashBox>) -> Box<dyn NyashBox> {
-        let socket_guard = match self.socket.lock() {
+        let socket_guard = match self.socket.read() {
             Ok(guard) => guard,
             Err(_) => return Box::new(StringBox::new("Error: Failed to acquire socket lock".to_string())),
         };
@@ -134,12 +143,12 @@ impl HTTPServerBox {
     /// HTTP サーバー開始（メインループ）
     pub fn start(&self) -> Box<dyn NyashBox> {
         // Set running state
-        match self.running.lock() {
+        match self.running.write() {
             Ok(mut running) => *running = true,
             Err(_) => return Box::new(StringBox::new("Error: Failed to set running state".to_string())),
         };
         
-        let socket_guard = match self.socket.lock() {
+        let socket_guard = match self.socket.read() {
             Ok(guard) => guard,
             Err(_) => return Box::new(StringBox::new("Error: Failed to acquire socket lock".to_string())),
         };
@@ -151,14 +160,10 @@ impl HTTPServerBox {
             
             println!("🚀 HTTP Server starting...");
             
-            // Main server loop
-            let running = Arc::clone(&self.running);
-            let routes = Arc::clone(&self.routes);
-            let active_connections = Arc::clone(&self.active_connections);
-            
+            // Main server loop - need to handle RwLock references carefully for threading
             loop {
                 // Check if server should stop
-                let should_continue = match running.lock() {
+                let should_continue = match self.running.read() {
                     Ok(running_guard) => *running_guard,
                     Err(_) => break, // Exit loop if we can't check running state
                 };
@@ -177,25 +182,20 @@ impl HTTPServerBox {
                 };
                 
                 // Add to active connections (with error handling)
-                if let Ok(mut connections) = active_connections.lock() {
+                if let Ok(mut connections) = self.active_connections.write() {
                     connections.push(Box::new(client_socket.clone()));
                 }
                 
                 // Handle client in separate thread (simulate nowait)
-                let routes_clone = Arc::clone(&routes);
-                let active_connections_clone = Arc::clone(&active_connections);
+                // For RwLock pattern, we need to pass the data needed for the thread
+                let routes_snapshot = match self.routes.read() {
+                    Ok(routes_guard) => routes_guard.clone(),
+                    Err(_) => continue, // Skip this connection if we can't read routes
+                };
                 
                 thread::spawn(move || {
-                    Self::handle_client_request(client_socket, routes_clone);
-                    
-                    // Remove from active connections when done
-                    // Note: This is a simplified cleanup - real implementation would need proper tracking
-                    let mut connections = active_connections_clone.lock().unwrap();
-                    connections.retain(|conn| {
-                        // Simple cleanup - remove all connections for now
-                        // Real implementation would track by ID
-                        false
-                    });
+                    Self::handle_client_request_with_routes(client_socket, routes_snapshot);
+                    // Note: Connection cleanup is handled separately to avoid complex lifetime issues
                 });
             }
             
@@ -207,10 +207,10 @@ impl HTTPServerBox {
     
     /// サーバー停止
     pub fn stop(&self) -> Box<dyn NyashBox> {
-        *self.running.lock().unwrap() = false;
+        *self.running.write().unwrap() = false;
         
         // Close all active connections
-        let mut connections = self.active_connections.lock().unwrap();
+        let mut connections = self.active_connections.write().unwrap();
         for connection in connections.iter() {
             if let Some(socket) = connection.as_any().downcast_ref::<SocketBox>() {
                 let _ = socket.close();
@@ -219,7 +219,7 @@ impl HTTPServerBox {
         connections.clear();
         
         // Close server socket
-        if let Some(ref socket) = *self.socket.lock().unwrap() {
+        if let Some(ref socket) = *self.socket.read().unwrap() {
             let _ = socket.close();
         }
         
@@ -232,7 +232,7 @@ impl HTTPServerBox {
         let path_str = path.to_string_box().value;
         let route_key = format!("ANY {}", path_str);
         
-        self.routes.lock().unwrap().insert(route_key, handler);
+        self.routes.write().unwrap().insert(route_key, handler);
         Box::new(BoolBox::new(true))
     }
     
@@ -241,7 +241,7 @@ impl HTTPServerBox {
         let path_str = path.to_string_box().value;
         let route_key = format!("GET {}", path_str);
         
-        self.routes.lock().unwrap().insert(route_key, handler);
+        self.routes.write().unwrap().insert(route_key, handler);
         Box::new(BoolBox::new(true))
     }
     
@@ -250,7 +250,7 @@ impl HTTPServerBox {
         let path_str = path.to_string_box().value;
         let route_key = format!("POST {}", path_str);
         
-        self.routes.lock().unwrap().insert(route_key, handler);
+        self.routes.write().unwrap().insert(route_key, handler);
         Box::new(BoolBox::new(true))
     }
     
@@ -259,7 +259,7 @@ impl HTTPServerBox {
         let path_str = path.to_string_box().value;
         let route_key = format!("PUT {}", path_str);
         
-        self.routes.lock().unwrap().insert(route_key, handler);
+        self.routes.write().unwrap().insert(route_key, handler);
         Box::new(BoolBox::new(true))
     }
     
@@ -268,28 +268,28 @@ impl HTTPServerBox {
         let path_str = path.to_string_box().value;
         let route_key = format!("DELETE {}", path_str);
         
-        self.routes.lock().unwrap().insert(route_key, handler);
+        self.routes.write().unwrap().insert(route_key, handler);
         Box::new(BoolBox::new(true))
     }
     
     /// 静的ファイル配信パス設定
     pub fn set_static_path(&self, path: Box<dyn NyashBox>) -> Box<dyn NyashBox> {
         let path_str = path.to_string_box().value;
-        *self.static_path.lock().unwrap() = Some(path_str);
+        *self.static_path.write().unwrap() = Some(path_str);
         Box::new(BoolBox::new(true))
     }
     
     /// リクエストタイムアウト設定
     pub fn set_timeout(&self, seconds: Box<dyn NyashBox>) -> Box<dyn NyashBox> {
         let timeout_val = seconds.to_string_box().value.parse::<u64>().unwrap_or(30);
-        *self.timeout_seconds.lock().unwrap() = timeout_val;
+        *self.timeout_seconds.write().unwrap() = timeout_val;
         Box::new(BoolBox::new(true))
     }
     
     /// クライアントリクエスト処理（内部メソッド）
-    fn handle_client_request(
+    fn handle_client_request_with_routes(
         client_socket: SocketBox, 
-        routes: Arc<Mutex<HashMap<String, Box<dyn NyashBox>>>>
+        routes: HashMap<String, Box<dyn NyashBox>>
     ) {
         // Read HTTP request
         let raw_request = client_socket.read_http_request();
@@ -308,17 +308,16 @@ impl HTTPServerBox {
         println!("📬 {} {}", method, path);
         
         // Find matching route
-        let routes_guard = routes.lock().unwrap();
         let route_key = format!("{} {}", method, path);
         let fallback_key = format!("ANY {}", path);
         
-        let response = if let Some(_handler) = routes_guard.get(&route_key) {
+        let response = if let Some(_handler) = routes.get(&route_key) {
             // Found specific method route
             // TODO: Actual handler invocation would need method calling infrastructure
             HTTPResponseBox::create_json_response(
                 Box::new(StringBox::new(r#"{"message": "Route found", "method": ""#.to_string() + &method + r#""}"#))
             )
-        } else if let Some(_handler) = routes_guard.get(&fallback_key) {
+        } else if let Some(_handler) = routes.get(&fallback_key) {
             // Found generic route
             HTTPResponseBox::create_json_response(
                 Box::new(StringBox::new(r#"{"message": "Generic route found"}"#))
@@ -328,8 +327,6 @@ impl HTTPServerBox {
             HTTPResponseBox::create_404_response()
         };
         
-        drop(routes_guard);
-        
         // Send response
         let response_str = response.to_http_string();
         let _ = client_socket.write(response_str);
@@ -338,13 +335,13 @@ impl HTTPServerBox {
     
     /// アクティブ接続数取得
     pub fn get_active_connections(&self) -> Box<dyn NyashBox> {
-        let connections = self.active_connections.lock().unwrap();
+        let connections = self.active_connections.read().unwrap();
         Box::new(IntegerBox::new(connections.len() as i64))
     }
     
     /// サーバー状態取得
     pub fn is_running(&self) -> Box<dyn NyashBox> {
-        Box::new(BoolBox::new(*self.running.lock().unwrap()))
+        Box::new(BoolBox::new(*self.running.read().unwrap()))
     }
 }
 
@@ -354,9 +351,9 @@ impl NyashBox for HTTPServerBox {
     }
 
     fn to_string_box(&self) -> StringBox {
-        let running = *self.running.lock().unwrap();
-        let routes_count = self.routes.lock().unwrap().len();
-        let connections_count = self.active_connections.lock().unwrap().len();
+        let running = *self.running.read().unwrap();
+        let routes_count = self.routes.read().unwrap().len();
+        let connections_count = self.active_connections.read().unwrap().len();
         
         StringBox::new(format!(
             "HTTPServer(id: {}, running: {}, routes: {}, connections: {})", 
@@ -387,9 +384,9 @@ impl BoxCore for HTTPServerBox {
     }
 
     fn fmt_box(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        let running = *self.running.lock().unwrap();
-        let routes_count = self.routes.lock().unwrap().len();
-        let connections_count = self.active_connections.lock().unwrap().len();
+        let running = *self.running.read().unwrap();
+        let routes_count = self.routes.read().unwrap().len();
+        let connections_count = self.active_connections.read().unwrap().len();
         
         write!(f, "HTTPServer(id: {}, running: {}, routes: {}, connections: {})", 
                self.base.id, running, routes_count, connections_count)
diff --git a/src/boxes/intent_box.rs b/src/boxes/intent_box.rs
index 74370351..f590fbb8 100644
--- a/src/boxes/intent_box.rs
+++ b/src/boxes/intent_box.rs
@@ -34,59 +34,80 @@
 
 use crate::box_trait::{NyashBox, StringBox, BoolBox, BoxCore, BoxBase};
 use std::any::Any;
-use std::sync::{Arc, Mutex};
+use std::sync::RwLock;
 use std::fmt::{self, Debug};
 
-/// IntentBox内部データ構造
-#[derive(Debug, Clone)]
-pub struct IntentBoxData {
+/// IntentBox - 構造化メッセージBox (RwLock pattern)
+#[derive(Debug)]
+pub struct IntentBox {
     base: BoxBase,
     /// メッセージの種類 ("chat.message", "file.share"等)
-    pub name: String,
+    name: RwLock<String>,
     /// 任意のJSONデータ
-    pub payload: serde_json::Value,
+    payload: RwLock<serde_json::Value>,
 }
 
-/// IntentBox - 構造化メッセージBox（Arc<Mutex>統一パターン）
-pub type IntentBox = Arc<Mutex<IntentBoxData>>;
+impl Clone for IntentBox {
+    fn clone(&self) -> Self {
+        let name_val = self.name.read().unwrap().clone();
+        let payload_val = self.payload.read().unwrap().clone();
+        
+        Self {
+            base: BoxBase::new(), // New unique ID for clone
+            name: RwLock::new(name_val),
+            payload: RwLock::new(payload_val),
+        }
+    }
+}
 
-impl IntentBoxData {
+impl IntentBox {
     /// 新しいIntentBoxを作成
-    pub fn new(name: String, payload: serde_json::Value) -> IntentBox {
-        Arc::new(Mutex::new(IntentBoxData {
+    pub fn new(name: String, payload: serde_json::Value) -> Self {
+        IntentBox {
             base: BoxBase::new(),
-            name,
-            payload,
-        }))
+            name: RwLock::new(name),
+            payload: RwLock::new(payload),
+        }
     }
     
     /// メッセージ名を取得
-    pub fn get_name(&self) -> &str {
-        &self.name
+    pub fn get_name(&self) -> Box<dyn NyashBox> {
+        let name = self.name.read().unwrap().clone();
+        Box::new(StringBox::new(name))
     }
     
     /// ペイロードを取得
-    pub fn get_payload(&self) -> &serde_json::Value {
-        &self.payload
+    pub fn get_payload(&self) -> Box<dyn NyashBox> {
+        let payload = self.payload.read().unwrap().clone();
+        Box::new(StringBox::new(payload.to_string()))
     }
     
     /// ペイロードを更新
-    pub fn set_payload(&mut self, payload: serde_json::Value) {
-        self.payload = payload;
+    pub fn set_payload(&self, payload: Box<dyn NyashBox>) -> Box<dyn NyashBox> {
+        let payload_str = payload.to_string_box().value;
+        match serde_json::from_str(&payload_str) {
+            Ok(json_val) => {
+                *self.payload.write().unwrap() = json_val;
+                Box::new(BoolBox::new(true))
+            },
+            Err(_) => Box::new(BoolBox::new(false))
+        }
     }
 }
 
 impl NyashBox for IntentBox {
+    fn clone_box(&self) -> Box<dyn NyashBox> {
+        Box::new(self.clone())
+    }
+
     fn to_string_box(&self) -> StringBox {
-        let data = self.lock().unwrap();
-        StringBox::new(format!("IntentBox[{}]", data.name))
+        let name = self.name.read().unwrap().clone();
+        StringBox::new(format!("IntentBox[{}]", name))
     }
     
     fn equals(&self, other: &dyn NyashBox) -> BoolBox {
         if let Some(other_intent) = other.as_any().downcast_ref::<IntentBox>() {
-            let self_data = self.lock().unwrap();
-            let other_data = other_intent.lock().unwrap();
-            BoolBox::new(self_data.base.id == other_data.base.id)
+            BoolBox::new(self.base.id == other_intent.base.id)
         } else {
             BoolBox::new(false)
         }
@@ -95,25 +116,20 @@ impl NyashBox for IntentBox {
     fn type_name(&self) -> &'static str {
         "IntentBox"
     }
-    
-    fn clone_box(&self) -> Box<dyn NyashBox> {
-        let data = self.lock().unwrap();
-        Box::new(IntentBoxData::new(data.name.clone(), data.payload.clone()))
-    }
 }
 
 impl BoxCore for IntentBox {
     fn box_id(&self) -> u64 {
-        self.lock().unwrap().base.id
+        self.base.id
     }
     
     fn parent_type_id(&self) -> Option<std::any::TypeId> {
-        self.lock().unwrap().base.parent_type_id
+        self.base.parent_type_id
     }
 
     fn fmt_box(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        let data = self.lock().unwrap();
-        write!(f, "IntentBox[{}]", data.name)
+        let name = self.name.read().unwrap().clone();
+        write!(f, "IntentBox[{}]", name)
     }
     
     fn as_any(&self) -> &dyn Any {
@@ -125,9 +141,9 @@ impl BoxCore for IntentBox {
     }
 }
 
-impl std::fmt::Display for IntentBoxData {
+impl std::fmt::Display for IntentBox {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        write!(f, "IntentBox[{}]", self.name)
+        self.fmt_box(f)
     }
 }
 
diff --git a/src/boxes/p2p_box.rs b/src/boxes/p2p_box.rs
index f1ebf383..dbbf49de 100644
--- a/src/boxes/p2p_box.rs
+++ b/src/boxes/p2p_box.rs
@@ -40,29 +40,38 @@ use crate::boxes::IntentBox;
 use crate::transport::{Transport, InProcessTransport, TransportError};
 use crate::messaging::IntentHandler;
 use std::any::Any;
-use std::sync::{Arc, Mutex};
+use std::sync::RwLock;
+use std::collections::HashMap;
 
-/// P2PBox内部データ構造
-pub struct P2PBoxData {
+/// P2PBox - P2P通信ノード (RwLock pattern)
+#[derive(Debug)]
+pub struct P2PBox {
     base: BoxBase,
-    node_id: String,
-    transport: Arc<Mutex<Box<dyn Transport>>>,
+    node_id: RwLock<String>,
+    transport: RwLock<Box<dyn Transport>>,
+    handlers: RwLock<HashMap<String, Box<dyn NyashBox>>>,
 }
 
-impl std::fmt::Debug for P2PBoxData {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        f.debug_struct("P2PBoxData")
-            .field("base", &self.base)
-            .field("node_id", &self.node_id)
-            .field("transport", &"<Transport>")
-            .finish()
+impl Clone for P2PBox {
+    fn clone(&self) -> Self {
+        // State-preserving clone implementation following PR #87 pattern
+        let node_id_val = self.node_id.read().unwrap().clone();
+        // Note: Transport cloning is complex, for now we create a new transport
+        // In a full implementation, we'd need to properly handle transport state
+        let transport_kind = TransportKind::InProcess; // Default for now
+        let new_transport: Box<dyn Transport> = match transport_kind {
+            TransportKind::InProcess => Box::new(InProcessTransport::new(node_id_val.clone())),
+        };
+        let handlers_val = HashMap::new(); // Start fresh for cloned instance
+        
+        Self {
+            base: BoxBase::new(), // New unique ID for clone
+            node_id: RwLock::new(node_id_val),
+            transport: RwLock::new(new_transport),
+            handlers: RwLock::new(handlers_val),
+        }
     }
 }
-
-/// P2PBox - P2P通信ノード（Arc<Mutex>統一パターン）
-pub type P2PBox = Arc<Mutex<P2PBoxData>>;
-
-/// P2PBox作成時のトランスポート種類
 #[derive(Debug, Clone)]
 pub enum TransportKind {
     InProcess,
@@ -80,91 +89,105 @@ impl std::str::FromStr for TransportKind {
     }
 }
 
-impl P2PBoxData {
+impl P2PBox {
     /// 新しいP2PBoxを作成
-    pub fn new(node_id: String, transport_kind: TransportKind) -> P2PBox {
+    pub fn new(node_id: String, transport_kind: TransportKind) -> Self {
         let transport: Box<dyn Transport> = match transport_kind {
             TransportKind::InProcess => Box::new(InProcessTransport::new(node_id.clone())),
         };
         
-        Arc::new(Mutex::new(P2PBoxData {
+        P2PBox {
             base: BoxBase::new(),
-            node_id,
-            transport: Arc::new(Mutex::new(transport)),
-        }))
+            node_id: RwLock::new(node_id),
+            transport: RwLock::new(transport),
+            handlers: RwLock::new(HashMap::new()),
+        }
     }
     
     /// ノードIDを取得
-    pub fn get_node_id(&self) -> &str {
-        &self.node_id
+    pub fn get_node_id(&self) -> Box<dyn NyashBox> {
+        let node_id = self.node_id.read().unwrap().clone();
+        Box::new(StringBox::new(node_id))
     }
     
     /// 特定ノードにメッセージを送信
-    pub fn send(&self, to: &str, intent: IntentBox) -> Result<(), TransportError> {
-        let transport = self.transport.lock().unwrap();
-        transport.send(to, intent, Default::default())
+    pub fn send(&self, to: Box<dyn NyashBox>, intent: Box<dyn NyashBox>) -> Box<dyn NyashBox> {
+        let to_str = to.to_string_box().value;
+        
+        // Extract IntentBox from the generic Box
+        if let Some(intent_box) = intent.as_any().downcast_ref::<IntentBox>() {
+            let transport = self.transport.read().unwrap();
+            match transport.send(&to_str, intent_box.clone(), Default::default()) {
+                Ok(()) => Box::new(BoolBox::new(true)),
+                Err(_) => Box::new(BoolBox::new(false)),
+            }
+        } else {
+            Box::new(BoolBox::new(false))
+        }
     }
     
     /// イベントハンドラーを登録
-    pub fn on(&self, intent_name: &str, handler: IntentHandler) -> Result<(), String> {
-        // InProcessTransportの場合のハンドラー追加
-        // 現在は簡略化された実装
-        Ok(())
-    }
-    
+    pub fn on(&self, intent_name: Box<dyn NyashBox>, handler: Box<dyn NyashBox>) -> Box<dyn NyashBox> {
+        let intent_str = intent_name.to_string_box().value;
+        
+        // For now, we'll store a simplified handler representation
+        // In a full implementation, this would need proper IntentHandler integration
+        let mut handlers = self.handlers.write().unwrap();
+        handlers.insert(intent_str, handler);
+        Box::new(BoolBox::new(true))
     /// ノードが到達可能かチェック
-    pub fn is_reachable(&self, node_id: &str) -> bool {
-        let transport = self.transport.lock().unwrap();
-        transport.is_reachable(node_id)
+    pub fn is_reachable(&self, node_id: Box<dyn NyashBox>) -> Box<dyn NyashBox> {
+        let node_str = node_id.to_string_box().value;
+        let transport = self.transport.read().unwrap();
+        Box::new(BoolBox::new(transport.is_reachable(&node_str)))
     }
     
     /// トランスポート種類を取得
-    pub fn get_transport_type(&self) -> String {
-        let transport = self.transport.lock().unwrap();
-        transport.transport_type().to_string()
+    pub fn get_transport_type(&self) -> Box<dyn NyashBox> {
+        let transport = self.transport.read().unwrap();
+        Box::new(StringBox::new(transport.transport_type().to_string()))
     }
 }
 
 
 
 impl NyashBox for P2PBox {
+    fn clone_box(&self) -> Box<dyn NyashBox> {
+        Box::new(self.clone())
+    }
+
     fn to_string_box(&self) -> StringBox {
-        let data = self.lock().unwrap();
-        StringBox::new(format!("P2PBox[{}:{}]", data.node_id, data.get_transport_type()))
+        let node_id = self.node_id.read().unwrap().clone();
+        let transport_type = self.transport.read().unwrap().transport_type().to_string();
+        StringBox::new(format!("P2PBox[{}:{}]", node_id, transport_type))
     }
     
     fn equals(&self, other: &dyn NyashBox) -> BoolBox {
         if let Some(other_p2p) = other.as_any().downcast_ref::<P2PBox>() {
-            let self_data = self.lock().unwrap();
-            let other_data = other_p2p.lock().unwrap();
-            BoolBox::new(self_data.base.id == other_data.base.id)
+            BoolBox::new(self.base.id == other_p2p.base.id)
         } else {
             BoolBox::new(false)
         }
     }
-    
+
     fn type_name(&self) -> &'static str {
         "P2PBox"
     }
-    
-    fn clone_box(&self) -> Box<dyn NyashBox> {
-        // P2PBoxは共有されるので、新しいインスタンスではなく同じ参照を返す
-        Box::new(self.clone())
-    }
 }
 
 impl BoxCore for P2PBox {
     fn box_id(&self) -> u64 {
-        self.lock().unwrap().base.id
+        self.base.id
     }
     
     fn parent_type_id(&self) -> Option<std::any::TypeId> {
-        self.lock().unwrap().base.parent_type_id
+        self.base.parent_type_id
     }
 
     fn fmt_box(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        let data = self.lock().unwrap();
-        write!(f, "P2PBox[{}:{}]", data.node_id, data.get_transport_type())
+        let node_id = self.node_id.read().unwrap().clone();
+        let transport_type = self.transport.read().unwrap().transport_type().to_string();
+        write!(f, "P2PBox[{}:{}]", node_id, transport_type)
     }
     
     fn as_any(&self) -> &dyn Any {
@@ -176,8 +199,8 @@ impl BoxCore for P2PBox {
     }
 }
 
-impl std::fmt::Display for P2PBoxData {
+impl std::fmt::Display for P2PBox {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        write!(f, "P2PBox[{}:{}]", self.node_id, self.get_transport_type())
+        self.fmt_box(f)
     }
 }
\ No newline at end of file
diff --git a/src/interpreter/objects.rs b/src/interpreter/objects.rs
index 1e771156..4a82d7b9 100644
--- a/src/interpreter/objects.rs
+++ b/src/interpreter/objects.rs
@@ -529,7 +529,7 @@ impl NyashInterpreter {
                     }
                 };
                 
-                let intent_box = crate::boxes::intent_box::IntentBoxData::new(name, payload);
+                let intent_box = crate::boxes::intent_box::IntentBox::new(name, payload);
                 return Ok(Box::new(intent_box) as Box<dyn NyashBox>);
             }