diff --git a/src/chat/sessionBridge.ts b/src/chat/sessionBridge.ts
index 3527764..ef76879 100644
--- a/src/chat/sessionBridge.ts
+++ b/src/chat/sessionBridge.ts
@@ -63,6 +63,16 @@ export class ChatSessionBridge {
       try {
         // 只有 opencode 侧 session 仍存在时，才复用本地映射。
         await this.runtime.getSession(current.sessionId);
+        await this.runtime.waitForSessionIdle(current.sessionId).catch((error) => {
+          logger.warn(
+            {
+              clientSessionId: requestContext.clientSessionId,
+              sessionId: current.sessionId,
+              err: error,
+            },
+            "failed while waiting for reused opencode session to become idle",
+          );
+        });
         return { binding: current, requestContext, created: false };
       } catch (error) {
         logger.warn(
@@ -161,6 +171,12 @@ export class ChatSessionBridge {
       traceId: requestContext.traceId,
     });
     await this.runtime.abortSession(binding.sessionId);
+    await this.runtime.waitForSessionIdle(binding.sessionId).catch((error) => {
+      logger.warn(
+        { clientSessionId, sessionId: binding.sessionId, err: error },
+        "failed while waiting for aborted opencode session to become idle",
+      );
+    });
     return binding;
   }
 
diff --git a/src/routes/chatStream.ts b/src/routes/chatStream.ts
index 7d5f315..e31c6c5 100644
--- a/src/routes/chatStream.ts
+++ b/src/routes/chatStream.ts
@@ -730,6 +730,12 @@ export const streamPromptResponse = async ({
       await runtime.abortSession(opencodeSessionId).catch((error) => {
         logger.warn({ sessionId: opencodeSessionId, err: error }, "failed to abort opencode session");
       });
+      await runtime.waitForSessionIdle(opencodeSessionId).catch((error) => {
+        logger.warn(
+          { sessionId: opencodeSessionId, err: error },
+          "failed while waiting for aborted opencode session to become idle",
+        );
+      });
       return { aborted: true, failed: false, toolCallCount };
     }
 
diff --git a/src/runtime/opencode.ts b/src/runtime/opencode.ts
index 11b77b0..087fcc2 100644
--- a/src/runtime/opencode.ts
+++ b/src/runtime/opencode.ts
@@ -92,6 +92,26 @@ export class OpencodeRuntimeAdapter {
     return requireData(response.data, "session.abort");
   }
 
+  async waitForSessionIdle(sessionId: string, timeoutMs = config.OPENCODE_TIMEOUT_MS) {
+    const client = await this.ensureClient();
+    const startedAt = Date.now();
+
+    while (Date.now() - startedAt < timeoutMs) {
+      const response = await client.session.status({});
+      const statuses = requireData(response.data, "session.status");
+      const status = statuses[sessionId];
+      if (!status || status.type === "idle") {
+        return;
+      }
+      await delay(100);
+    }
+
+    logger.warn(
+      { sessionId, timeoutMs },
+      "timed out waiting for opencode session to become idle",
+    );
+  }
+
   async subscribeEvents() {
     const client = await this.ensureClient();
     const response = await client.event.subscribe();
@@ -180,3 +200,9 @@ function requireData<T>(data: T | undefined, operation: string): T {
   }
   return data;
 }
+
+function delay(ms: number) {
+  return new Promise<void>((resolve) => {
+    setTimeout(resolve, ms);
+  });
+}