diff --git a/src/cron/isolated-agent/run.ts b/src/cron/isolated-agent/run.ts
index c017a2800e6..c10ae86e22c 100644
--- a/src/cron/isolated-agent/run.ts
+++ b/src/cron/isolated-agent/run.ts
@@ -44,7 +44,6 @@ import {
   isExternalHookSession,
   resolveHookExternalContentSource,
 } from "../../security/external-content.js";
-import { estimateUsageCost, resolveModelCostConfig } from "../../utils/usage-format.js";
 import { resolveCronDeliveryPlan } from "../delivery.js";
 import type { CronJob, CronRunOutcome, CronRunTelemetry } from "../types.js";
 import {
@@ -174,6 +173,10 @@ async function loadCliRunnerRuntime() {
   return await import("../../agents/cli-runner.runtime.js");
 }
 
+async function loadUsageFormatRuntime() {
+  return await import("../../utils/usage-format.js");
+}
+
 export async function runCronIsolatedAgentTurn(params: {
   cfg: OpenClawConfig;
   deps: CliDeps;
@@ -727,6 +730,7 @@ export async function runCronIsolatedAgentTurn(params: {
       }
     }
     if (hasNonzeroUsage(usage)) {
+      const { estimateUsageCost, resolveModelCostConfig } = await loadUsageFormatRuntime();
       const input = usage.input ?? 0;
       const output = usage.output ?? 0;
       const totalTokens = deriveSessionTotalTokens({