diff --git a/src/agents/pi-embedded-runner/run.compaction-loop-guard.test.ts b/src/agents/pi-embedded-runner/run.compaction-loop-guard.test.ts
index 4bfc0c373d8..83b9780416a 100644
--- a/src/agents/pi-embedded-runner/run.compaction-loop-guard.test.ts
+++ b/src/agents/pi-embedded-runner/run.compaction-loop-guard.test.ts
@@ -285,6 +285,66 @@ describe("post-compaction loop guard wired into runEmbeddedPiAgent", () => {
     expect(mockedRunEmbeddedAttempt).toHaveBeenCalledTimes(2);
   });
 
+  it("uses the active agent post-compaction guard window over the global default", async () => {
+    const overflowError = makeOverflowError();
+
+    mockedRunEmbeddedAttempt.mockImplementationOnce(async () =>
+      makeAttemptResult({ promptError: overflowError }),
+    );
+    mockedRunEmbeddedAttempt.mockImplementationOnce(async (attemptParams: unknown) => {
+      const onToolOutcome = (attemptParams as { onToolOutcome?: ToolOutcomeObserver })
+        .onToolOutcome;
+      for (let i = 0; i < 3; i += 1) {
+        await executeWrappedToolOutcome(
+          "gateway",
+          { action: "lookup", path: "x" },
+          "identical-result",
+          onToolOutcome,
+        );
+      }
+      return makeAttemptResult({
+        promptError: null,
+        toolMetas: [{ toolName: "gateway" }, { toolName: "gateway" }, { toolName: "gateway" }],
+      });
+    });
+
+    mockedCompactDirect.mockResolvedValueOnce(
+      makeCompactionSuccess({
+        summary: "Compacted session",
+        firstKeptEntryId: "entry-5",
+        tokensBefore: 150000,
+      }),
+    );
+
+    const result = await runEmbeddedPiAgent({
+      ...baseParams,
+      agentId: "agent-a",
+      config: {
+        tools: {
+          loopDetection: {
+            postCompactionGuard: { enabled: true, windowSize: 2 },
+          },
+        },
+        agents: {
+          list: [
+            {
+              id: "agent-a",
+              tools: {
+                loopDetection: {
+                  postCompactionGuard: { windowSize: 4 },
+                },
+              },
+            },
+          ],
+        },
+      } as never,
+    });
+
+    expect(result.meta.error).toBeUndefined();
+    expect(mockedCompactDirect).toHaveBeenCalledTimes(1);
+    expect(mockedRunEmbeddedAttempt).toHaveBeenCalledTimes(2);
+  });
+
   it("aborts post-compaction loop from the live tool path even when toolCallHistory is at its trim cap", async () => {
     // Long-running sessions accumulate up to historySize (default 30) records
     // in toolCallHistory. The live observer must still see the new outcome
diff --git a/src/agents/pi-embedded-runner/run.ts b/src/agents/pi-embedded-runner/run.ts
index 314b2dc9abf..f3e99919081 100644
--- a/src/agents/pi-embedded-runner/run.ts
+++ b/src/agents/pi-embedded-runner/run.ts
@@ -82,6 +82,7 @@ import { runAgentCleanupStep } from "../run-cleanup-timeout.js";
 import { buildAgentRuntimeAuthPlan } from "../runtime-plan/auth.js";
 import { buildAgentRuntimePlan } from "../runtime-plan/build.js";
 import { ensureRuntimePluginsLoaded } from "../runtime-plugins.js";
+import { resolveToolLoopDetectionConfig } from "../tool-loop-detection-config.js";
 import { derivePromptTokens, normalizeUsage, type UsageLike } from "../usage.js";
 import { redactRunIdentifier, resolveRunWorkspaceDir } from "../workspace-run.js";
 import { runPostCompactionSideEffects } from "./compaction-hooks.js";
@@ -790,8 +791,12 @@ export async function runEmbeddedPiAgent(
       // Post-compaction loop guard for #77474. Armed at each compaction-success
       // site below; observed from the live tool-outcome path so it can abort
       // while the post-compaction prompt is still running.
+      const resolvedLoopDetectionConfig = resolveToolLoopDetectionConfig({
+        cfg: params.config,
+        agentId: sessionAgentId,
+      });
       const postCompactionGuard = createPostCompactionLoopGuard(
-        params.config?.tools?.loopDetection?.postCompactionGuard,
+        resolvedLoopDetectionConfig?.postCompactionGuard,
       );
       const observePostCompactionToolOutcome = (
         observation: PostCompactionGuardObservation,
diff --git a/src/agents/pi-tools.ts b/src/agents/pi-tools.ts
index 80d78201aa6..89cd59827f8 100644
--- a/src/agents/pi-tools.ts
+++ b/src/agents/pi-tools.ts
@@ -2,7 +2,6 @@ import { createCodingTools, createReadTool } from "@mariozechner/pi-coding-agent
 import { HEARTBEAT_RESPONSE_TOOL_NAME } from "../auto-reply/heartbeat-tool-response.js";
 import type { ModelCompatConfig } from "../config/types.models.js";
 import type { OpenClawConfig } from "../config/types.openclaw.js";
-import type { ToolLoopDetectionConfig } from "../config/types.tools.js";
 import type { DiagnosticTraceContext } from "../infra/diagnostic-trace-context.js";
 import { resolveMergedSafeBinProfileFixtures } from "../infra/exec-safe-bin-runtime-policy.js";
 import { logWarn } from "../logger.js";
@@ -65,6 +64,7 @@ import {
   PROCESS_TOOL_DISPLAY_SUMMARY,
 } from "./tool-description-presets.js";
 import { createToolFsPolicy, resolveToolFsConfig } from "./tool-fs-policy.js";
+import { resolveToolLoopDetectionConfig } from "./tool-loop-detection-config.js";
 import {
   applyToolPolicyPipeline,
   buildDefaultToolPolicyPipelineSteps,
@@ -233,32 +233,7 @@ function resolveExecConfig(params: { cfg?: OpenClawConfig; agentId?: string }) {
   };
 }
 
-export function resolveToolLoopDetectionConfig(params: {
-  cfg?: OpenClawConfig;
-  agentId?: string;
-}): ToolLoopDetectionConfig | undefined {
-  const global = params.cfg?.tools?.loopDetection;
-  const agent =
-    params.agentId && params.cfg
-      ? resolveAgentConfig(params.cfg, params.agentId)?.tools?.loopDetection
-      : undefined;
-
-  if (!agent) {
-    return global;
-  }
-  if (!global) {
-    return agent;
-  }
-
-  return {
-    ...global,
-    ...agent,
-    detectors: {
-      ...global.detectors,
-      ...agent.detectors,
-    },
-  };
-}
+export { resolveToolLoopDetectionConfig } from "./tool-loop-detection-config.js";
 
 export const __testing = {
   cleanToolSchemaForGemini,
diff --git a/src/agents/tool-loop-detection-config.ts b/src/agents/tool-loop-detection-config.ts
new file mode 100644
index 00000000000..5da91231bcb
--- /dev/null
+++ b/src/agents/tool-loop-detection-config.ts
@@ -0,0 +1,34 @@
+import type { OpenClawConfig } from "../config/types.openclaw.js";
+import type { ToolLoopDetectionConfig } from "../config/types.tools.js";
+import { resolveAgentConfig } from "./agent-scope.js";
+
+export function resolveToolLoopDetectionConfig(params: {
+  cfg?: OpenClawConfig;
+  agentId?: string;
+}): ToolLoopDetectionConfig | undefined {
+  const global = params.cfg?.tools?.loopDetection;
+  const agent =
+    params.agentId && params.cfg
+      ? resolveAgentConfig(params.cfg, params.agentId)?.tools?.loopDetection
+      : undefined;
+
+  if (!agent) {
+    return global;
+  }
+  if (!global) {
+    return agent;
+  }
+
+  return {
+    ...global,
+    ...agent,
+    detectors: {
+      ...global.detectors,
+      ...agent.detectors,
+    },
+    postCompactionGuard: {
+      ...global.postCompactionGuard,
+      ...agent.postCompactionGuard,
+    },
+  };
+}
diff --git a/src/config/schema.labels.ts b/src/config/schema.labels.ts
index 641c3a9847d..f73243b4f3f 100644
--- a/src/config/schema.labels.ts
+++ b/src/config/schema.labels.ts
@@ -215,6 +215,8 @@ export const FIELD_LABELS: Record<string, string> = {
   "tools.loopDetection.unknownToolThreshold": "Unknown-tool Loop Threshold",
   "tools.loopDetection.criticalThreshold": "Tool-loop Critical Threshold",
   "tools.loopDetection.globalCircuitBreakerThreshold": "Tool-loop Global Circuit Breaker Threshold",
+  "tools.loopDetection.postCompactionGuard.enabled": "Post-compaction Loop Guard",
+  "tools.loopDetection.postCompactionGuard.windowSize": "Post-compaction Loop Guard Window Size",
   "tools.loopDetection.detectors.genericRepeat": "Tool-loop Generic Repeat Detection",
   "tools.loopDetection.detectors.knownPollNoProgress": "Tool-loop Poll No-Progress Detection",
   "tools.loopDetection.detectors.pingPong": "Tool-loop Ping-Pong Detection",