diff --git a/packages/acp-core/protocol/ClaudeCliProtocol.js b/packages/acp-core/protocol/ClaudeCliProtocol.js
index ac143f5..f55eaa6 100644
--- a/packages/acp-core/protocol/ClaudeCliProtocol.js
+++ b/packages/acp-core/protocol/ClaudeCliProtocol.js
@@ -81,7 +81,9 @@ class ClaudeCliProtocol extends EventEmitter {
 
         // stdout → NDJSON 解析
         this._child.stdout.on('data', (data) => {
-            this._buffer += data.toString();
+            const raw = data.toString();
+            console.log(`[ClaudeCliProtocol] 📥 stdout (${raw.length} bytes):`, raw.substring(0, 200));
+            this._buffer += raw;
             const lines = this._buffer.split('\n');
             this._buffer = lines.pop() || '';
 
@@ -103,7 +105,7 @@ class ClaudeCliProtocol extends EventEmitter {
         this._child.stderr.on('data', (data) => {
             const msg = data.toString().trim();
             if (msg) {
-                console.log('[ClaudeCliProtocol] stderr:', msg.substring(0, 300));
+                console.log(`[ClaudeCliProtocol] 🚨 stderr (${msg.length} bytes):`, msg.substring(0, 500));
                 this.emit('stderr', msg);
 
                 // 检测致命错误：如果 sendPrompt 正在等待，主动 reject 防止 Promise 永远挂起
@@ -252,6 +254,7 @@ class ClaudeCliProtocol extends EventEmitter {
      * @private
      */
     _handleStreamEvent(event) {
+        console.log(`[ClaudeCliProtocol] 🔄 event.type=${event.type}`);
         switch (event.type) {
             case 'system':
                 this.sessionId = event.session_id || this.sessionId;
@@ -302,6 +305,26 @@ class ClaudeCliProtocol extends EventEmitter {
                     this._promptReject = null;
                 }
                 break;
+            case 'error':
+                this.emit('acp_event', {
+                    type: 'notification',
+                    method: 'claude/error',
+                    params: event,
+                    timestamp: Date.now(),
+                });
+                
+                // API 报错（如 MiniMax 429）会通过 stdout 下发 error 对象，此时不会下发 result
+                if (this._promptReject) {
+                    const errMsg = event.error?.message || event.message || JSON.stringify(event);
+                    const err = new Error(`API 请求失败: ${errMsg}`);
+                    console.error(`[ClaudeCliProtocol] 拦截到底层 API 错误:`, err.message);
+                    
+                    if (this._idleTimer) { clearTimeout(this._idleTimer); this._idleTimer = null; }
+                    this._promptReject(err);
+                    this._promptResolve = null;
+                    this._promptReject = null;
+                }
+                break;
 
             default:
                 this.emit('acp_event', {
diff --git a/server/routes/agent-chat.js b/server/routes/agent-chat.js
index 6ca8d7d..40bfde4 100644
--- a/server/routes/agent-chat.js
+++ b/server/routes/agent-chat.js
@@ -1664,6 +1664,7 @@ router.post('/:agentId/chat', async (req, res) => {
       const onUpdate = (payload) => {
         const update = payload.update;
         if (update?.sessionUpdate === 'agent_message_chunk' && update.content?.text) {
+          console.log(`[SSE-DEBUG] 📤 agent_output (${update.content.text.length} chars)`);
           fullOutput += update.content.text;
           logMessageChunk(agentId, convId, update.content.text);
           sendSSE('agent_output', { agent: agentId, message: update.content.text });
@@ -1751,6 +1752,9 @@ router.post('/:agentId/chat', async (req, res) => {
       entry.protocol.on('stderr', onStderr);
       entry.protocol.on('disconnected', onDisconnected);
 
+      // 发出状态以便前端展示不卡壳
+      sendSSE('agent_output', { agent: agentId, message: `_[系统正在通过 \`${fullSystemConfig.model}\` 请求响应...]_\\\n\\\n` });
+      
       // 发送 prompt 并等待完成
       await entry.protocol.sendPrompt(prompt);
 
@@ -1895,6 +1899,7 @@ ${resultsText.join('\n\n')}
     sessions.delete(key);
 
     sendSSE('error', { message: err.message });
+    console.log(`[SSE-DEBUG] 🚨 sendSSE('error') called:`, err.message.substring(0, 200));
   } finally {
     res.end();
   }