diff --git a/multi-review/src/index.ts b/multi-review/src/index.ts
index 3405054..3a5cdfb 100644
--- a/multi-review/src/index.ts
+++ b/multi-review/src/index.ts
@@ -2,7 +2,7 @@ import { createOpencode } from "@opencode-ai/sdk";
 import { readFileSync } from "node:fs";
 import { join } from "node:path";
 import { loadReviewers, resolveModel, env, intEnv } from "./reviewers.js";
-import { runParallelReviewers, runCoordinator, buildFallbackComment, buildReviewerDetails } from "./orchestrator.js";
+import { runParallelReviewers, runCoordinator, buildFallbackComment, buildReviewerDetails, cleanupAllSessions } from "./orchestrator.js";
 import { postPRComment, cleanupErrorComments, parseExtraEnv } from "./comment.js";
 
 async function main(): Promise<number> {
@@ -42,6 +42,19 @@ async function main(): Promise<number> {
   });
   console.log("Server ready");
 
+  // Register signal handlers for graceful cleanup (best-effort)
+  const shutdown = (signal: string) => {
+    console.log(`Received ${signal}, cleaning up sessions...`);
+    cleanupAllSessions(client)
+      .catch(() => { /* ignore */ })
+      .finally(() => {
+        server.close();
+        process.exit(signal === "SIGTERM" ? 143 : 130);
+      });
+  };
+  process.once("SIGTERM", () => shutdown("SIGTERM"));
+  process.once("SIGINT", () => shutdown("SIGINT"));
+
   try {
     // 5. Run reviewers in parallel
     const globalTimeout = intEnv("MULTI_REVIEW_TIMEOUT_SECONDS", 900);
@@ -83,6 +96,7 @@ async function main(): Promise<number> {
 
     return 0;
   } finally {
+    await cleanupAllSessions(client);
     server.close();
   }
 }
diff --git a/multi-review/src/orchestrator.ts b/multi-review/src/orchestrator.ts
index 15d235b..d682695 100644
--- a/multi-review/src/orchestrator.ts
+++ b/multi-review/src/orchestrator.ts
@@ -1,6 +1,8 @@
 import type { OpencodeClient } from "@opencode-ai/sdk";
 import type { Reviewer, ReviewResult, OrchestratorOptions } from "./types.js";
 
+const activeSessions = new Set<string>();
+
 const DEFAULT_COORDINATOR_PROMPT = `你是一个代码审查协调员。以下审查由独立的专家 reviewer 生成。
 你的任务是整合为一个去重后的综合报告。
 
@@ -60,6 +62,7 @@ export async function runParallelReviewers(
         reviewer.name,
       );
       sessionId = sessionResult.data.id;
+      activeSessions.add(sessionId);
 
       const promptResult = await withTimeout(
         client.session.prompt({
@@ -89,6 +92,7 @@ export async function runParallelReviewers(
       return { reviewer: reviewer.name, content: "", success: false, error: msg };
     } finally {
       if (sessionId) {
+        activeSessions.delete(sessionId);
         try { await client.session.delete({ path: { id: sessionId } }); } catch { /* ignore */ }
       }
     }
@@ -117,6 +121,7 @@ export async function runCoordinator(
       "coordinator",
     );
     sessionId = sessionResult.data.id;
+    activeSessions.add(sessionId);
 
     console.log("[coordinator] Starting synthesis...");
 
@@ -142,6 +147,7 @@ export async function runCoordinator(
     return content;
   } finally {
     if (sessionId) {
+      activeSessions.delete(sessionId);
       try { await client.session.delete({ path: { id: sessionId } }); } catch { /* ignore */ }
     }
   }
@@ -162,3 +168,10 @@ export function buildReviewerDetails(reviews: ReviewResult[]): string {
   });
   return `<details>\n<summary>📋 各 Reviewer 详细审查结果</summary>\n\n${details.join("\n\n")}\n\n</details>`;
 }
+
+export async function cleanupAllSessions(client: OpencodeClient): Promise<void> {
+  for (const id of activeSessions) {
+    try { await client.session.delete({ path: { id } }); } catch { /* ignore */ }
+  }
+  activeSessions.clear();
+}