diff --git a/src/agents/claude-runner.ts b/src/agents/claude-runner.ts
index 61a6aab..a9bad7b 100644
--- a/src/agents/claude-runner.ts
+++ b/src/agents/claude-runner.ts
@@ -241,6 +241,7 @@ export class AgentRunner {
   private config?: Config;
   private activeSessions: Map<string, string> = new Map();
   private activeStreams = new Map<string, AsyncIterable<any>>();
+  private activeAbortControllers = new Map<string, AbortController>();
   private interruptFns = new Map<string, () => Promise<void>>();
   private onSessionIdUpdate?: (sessionId: string, agentSessionId: string) => void;
   private onCompactStart?: (sessionId: string) => void;
@@ -699,6 +700,11 @@ export class AgentRunner {
       env: this.getAgentEnv()
     };
 
+    // AbortController for this query — enables interrupt() to cancel both
+    // the connection phase and the streaming phase
+    const controller = new AbortController();
+    this.activeAbortControllers.set(sessionId, controller);
+
     const createQuery = (promptInput: string | MessageStream, resumeSessionId?: string) => {
       if (useSettingSources) {
         // 新方式：SDK 自动加载 CLAUDE.md 和 MCP 配置
@@ -706,6 +712,7 @@ export class AgentRunner {
           prompt: promptInput as any,
           options: {
             ...commonOptions,
+            abortController: controller,
             settingSources: ['project', 'user'],
             systemPrompt: {
               type: 'preset' as const,
@@ -752,6 +759,7 @@ export class AgentRunner {
           prompt: promptInput as any,
           options: {
             ...commonOptions,
+            abortController: controller,
             ...(resumeSessionId ? { resume: resumeSessionId } : {}),
             ...(Object.keys(globalMcpServers).length > 0 ? { mcpServers: globalMcpServers } : {}),
             ...(fullAppend ? {
@@ -787,6 +795,13 @@ export class AgentRunner {
   }
 
   async interrupt(sessionId: string): Promise<void> {
+    // Abort via controller first (covers connection phase before stream starts)
+    const controller = this.activeAbortControllers.get(sessionId);
+    if (controller) {
+      controller.abort('User interrupt');
+      this.activeAbortControllers.delete(sessionId);
+    }
+
     const fn = this.interruptFns.get(sessionId);
     if (fn) {
       try {
@@ -810,6 +825,7 @@ export class AgentRunner {
 
   cleanupStream(sessionId: string): void {
     this.activeStreams.delete(sessionId);
+    this.activeAbortControllers.delete(sessionId);
     this.interruptFns.delete(sessionId);
   }
 
@@ -885,6 +901,7 @@ export class AgentRunner {
   async closeSession(sessionId: string): Promise<void> {
     this.activeSessions.delete(sessionId);
     this.activeStreams.delete(sessionId);
+    this.activeAbortControllers.delete(sessionId);
     this.interruptFns.delete(sessionId);
   }
 
diff --git a/src/core/message/message-processor.ts b/src/core/message/message-processor.ts
index 203faaf..6f6b50f 100644
--- a/src/core/message/message-processor.ts
+++ b/src/core/message/message-processor.ts
@@ -494,19 +494,31 @@ ${suggestions}`,
         const effectiveSystemPrompt = [options?.systemPromptAppend, ...contextParts].filter(Boolean).join('\n') || undefined;
 
         // 可重试错误（403/429/5xx）指数退避重试，最多 3 次
+        const connectionTimeoutMs = (this.config.idleMonitor?.connectionTimeout ?? 30) * 1000;
         const MAX_RETRIES = 3;
         for (let attempt = 1; attempt <= MAX_RETRIES; attempt++) {
           let streamRegistered = false;
           try {
-            const stream = await agent.runQuery(
-              session.id,
-              effectivePrompt,
-              absoluteProjectPath,
-              session.agentSessionId,
-              message.images,
-              effectiveSystemPrompt,
-              this.sessionManager
-            );
+            // Connection-phase timeout: if runQuery() (API handshake) hangs
+            // beyond connectionTimeout, abort and throw a clear error.
+            let connectionTimer: ReturnType<typeof setTimeout> | undefined;
+            const stream = await Promise.race([
+              agent.runQuery(
+                session.id,
+                effectivePrompt,
+                absoluteProjectPath,
+                session.agentSessionId,
+                message.images,
+                effectiveSystemPrompt,
+                this.sessionManager
+              ).then(s => { clearTimeout(connectionTimer); return s; }),
+              new Promise<never>((_, reject) => {
+                connectionTimer = setTimeout(() => {
+                  agent.interrupt(streamKey).catch(() => {});
+                  reject(new Error('Connection timeout: agent failed to start stream within ' + (connectionTimeoutMs / 1000) + 's'));
+                }, connectionTimeoutMs);
+              }),
+            ]);
             agent.registerStream(streamKey, stream);
             streamRegistered = true;
 
diff --git a/src/types.ts b/src/types.ts
index 229543b..af3fe83 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -102,6 +102,7 @@ export interface Config {
     enabled?: boolean;              // 是否启用空闲监控，默认 true
     safeModeThreshold?: number;     // 连续错误几次进入安全模式，默认 3；设为 0 关闭 safe mode
     timeout?: number;               // 无输出超时(秒)，默认 120
+    connectionTimeout?: number;     // 连接阶段超时(秒)，默认 30；query() 调用到流开始前的最大等待
   };
   showActivities?: 'all' | 'dm-only' | 'owner-dm-only' | 'none';  // 中间输出显示范围（工具活动+流式文本），默认 'all'
 }