diff --git a/src/agents/pi-embedded-runner/compact.ts b/src/agents/pi-embedded-runner/compact.ts
index 2895f0d730d..70c091fafef 100644
--- a/src/agents/pi-embedded-runner/compact.ts
+++ b/src/agents/pi-embedded-runner/compact.ts
@@ -14,6 +14,7 @@ import { resolveChannelCapabilities } from "../../config/channel-capabilities.js
 import type { OpenClawConfig } from "../../config/config.js";
 import { getMachineDisplayName } from "../../infra/machine-name.js";
 import { generateSecureToken } from "../../infra/secure-random.js";
+import { getMemorySearchManager } from "../../memory/index.js";
 import { getGlobalHookRunner } from "../../plugins/hook-runner-global.js";
 import { type enqueueCommand, enqueueCommandInLane } from "../../process/command-queue.js";
 import { isCronSessionKey, isSubagentSessionKey } from "../../routing/session-key.js";
@@ -26,13 +27,14 @@ import { resolveUserPath } from "../../utils.js";
 import { normalizeMessageChannel } from "../../utils/message-channel.js";
 import { isReasoningTagProvider } from "../../utils/provider-utils.js";
 import { resolveOpenClawAgentDir } from "../agent-paths.js";
-import { resolveSessionAgentIds } from "../agent-scope.js";
+import { resolveSessionAgentId, resolveSessionAgentIds } from "../agent-scope.js";
 import type { ExecElevatedDefaults } from "../bash-tools.js";
 import { makeBootstrapWarn, resolveBootstrapContextForRun } from "../bootstrap-files.js";
 import { listChannelSupportedActions, resolveChannelMessageToolHints } from "../channel-tools.js";
 import { formatUserTime, resolveUserTimeFormat, resolveUserTimezone } from "../date-time.js";
 import { DEFAULT_MODEL, DEFAULT_PROVIDER } from "../defaults.js";
 import { resolveOpenClawDocsPath } from "../docs-path.js";
+import { resolveMemorySearchConfig } from "../memory-search.js";
 import { getApiKeyForModel, resolveModelAuthMode } from "../model-auth.js";
 import { ensureOpenClawModelsJson } from "../models-config.js";
 import { resolveOwnerDisplaySetting } from "../owner-display.js";
@@ -252,11 +254,42 @@ function resolvePostCompactionIndexSyncMode(config?: OpenClawConfig): "off" | "a
 
 async function syncPostCompactionSessionMemory(params: {
   config?: OpenClawConfig;
+  sessionKey?: string;
   mode: "off" | "async" | "await";
 }): Promise<void> {
   if (params.mode === "off" || !params.config) {
     return;
   }
+  try {
+    const agentId = resolveSessionAgentId({
+      sessionKey: params.sessionKey,
+      config: params.config,
+    });
+    const resolvedMemory = resolveMemorySearchConfig(params.config, agentId);
+    if (!resolvedMemory || !resolvedMemory.sources.includes("sessions")) {
+      return;
+    }
+    const { manager } = await getMemorySearchManager({
+      cfg: params.config,
+      agentId,
+    });
+    if (!manager?.sync) {
+      return;
+    }
+    const syncTask = manager.sync({
+      reason: "post-compaction",
+      force: resolvedMemory.sync.sessions.postCompactionForce,
+    });
+    if (params.mode === "await") {
+      await syncTask;
+    } else {
+      void syncTask.catch((err) => {
+        log.warn(`memory sync failed (post-compaction): ${String(err)}`);
+      });
+    }
+  } catch (err) {
+    log.warn(`memory sync skipped (post-compaction): ${String(err)}`);
+  }
 }
 
 /**
@@ -686,6 +719,7 @@ export async function compactEmbeddedPiSessionDirect(
         emitSessionTranscriptUpdate(params.sessionFile);
         await syncPostCompactionSessionMemory({
           config: params.config,
+          sessionKey: params.sessionKey,
           mode: resolvePostCompactionIndexSyncMode(params.config),
         });
         // Estimate tokens after compaction by summing token estimates for remaining messages