diff --git a/src/gateway/server-methods/cron.ts b/src/gateway/server-methods/cron.ts
index 280ad28296cb..79dcc9e0d24d 100644
--- a/src/gateway/server-methods/cron.ts
+++ b/src/gateway/server-methods/cron.ts
@@ -105,14 +105,26 @@ function resolveAgentRuntimeAuthorityCommitGuard(
 }
 
 function combineCronCommitGuards(
-  ...guards: Array<(() => void) | undefined>
-): (() => void) | undefined {
-  const active = guards.filter((guard): guard is () => void => guard !== undefined);
+  ...guards: Array<(() => void | CronRuntimeAuthority) | undefined>
+): (() => CronRuntimeAuthority | undefined) | undefined {
+  const active = guards.filter(
+    (guard): guard is () => void | CronRuntimeAuthority => guard !== undefined,
+  );
   return active.length > 0
     ? () => {
+        let runtimeAuthority: CronRuntimeAuthority | undefined;
         for (const guard of active) {
-          guard();
+          const candidate = guard();
+          if (candidate !== undefined) {
+            // A mutation has one runtime-authority owner. Combining validation
+            // guards must not silently choose between competing authority caps.
+            if (runtimeAuthority !== undefined) {
+              throw new TypeError("multiple cron runtime authorities resolved at commit");
+            }
+            runtimeAuthority = candidate;
+          }
         }
+        return runtimeAuthority;
       }
     : undefined;
 }
diff --git a/src/gateway/server-methods/cron.validation.test.ts b/src/gateway/server-methods/cron.validation.test.ts
index 11a3f663b84c..a5490fef7de0 100644
--- a/src/gateway/server-methods/cron.validation.test.ts
+++ b/src/gateway/server-methods/cron.validation.test.ts
@@ -7,6 +7,7 @@ import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
 import { createOperationalRunInstanceRef } from "../../agents/admitted-run-context.js";
 import type { ChannelPlugin } from "../../channels/plugins/types.public.js";
 import type { OpenClawConfig } from "../../config/types.openclaw.js";
+import type { CronRuntimeAuthority } from "../../cron/runtime-authority.js";
 import type { CronDelivery, CronJob } from "../../cron/types.js";
 import { resetPluginRuntimeStateForTest, setActivePluginRegistry } from "../../plugins/runtime.js";
 import {
@@ -132,6 +133,7 @@ function setCronValidationTestRegistry(): void {
 function createCronContext(currentJobs?: CronJob | CronJob[]) {
   const jobs = currentJobs ? (Array.isArray(currentJobs) ? currentJobs : [currentJobs]) : [];
   const committedAdds: Partial<CronJob>[] = [];
+  const committedRuntimeAuthorities: Array<CronRuntimeAuthority | undefined> = [];
   const committedUpdates: Array<{ id: string; patch: Partial<CronJob> }> = [];
   const update = vi.fn(async (id: string, patch: Partial<CronJob>) => {
     committedUpdates.push({ id, patch });
@@ -143,13 +145,19 @@ function createCronContext(currentJobs?: CronJob | CronJob[]) {
   });
   return {
     committedAdds,
+    committedRuntimeAuthorities,
     committedUpdates,
     cron: {
-      add: vi.fn(async (input: Partial<CronJob>, opts?: { commitGuard?: () => void }) => {
-        opts?.commitGuard?.();
-        committedAdds.push(input);
-        return createCronJob({ ...input, id: "cron-1" });
-      }),
+      add: vi.fn(
+        async (
+          input: Partial<CronJob>,
+          opts?: { commitGuard?: () => CronRuntimeAuthority | undefined },
+        ) => {
+          committedRuntimeAuthorities.push(opts?.commitGuard?.());
+          committedAdds.push(input);
+          return createCronJob({ ...input, id: "cron-1" });
+        },
+      ),
       update,
       updateWithPrecondition: vi.fn(
         async (
@@ -1326,6 +1334,28 @@ describe("cron method validation", () => {
     revokeCronCreatorAuthorityRunScope(scope);
   });
 
+  it("preserves creator runtime authority while revalidating delegated authority at commit", async () => {
+    const runtimeAuthority = {
+      version: 1 as const,
+      runtimeId: "codex",
+      namespace: "codex.apps",
+      payload: { apps: [{ id: "calendar" }] },
+    };
+    const scope = createCronCreatorAuthorityRunScope("run-add-authority");
+    const grant = mintCronCreatorAuthorityGrant(scope, undefined, runtimeAuthority);
+    const context = createCronContext();
+    context.validateAgentRuntimeApprovalAuthority = () => true;
+
+    const result = await invokeCron("cron.add", agentTurnCronParams(), {
+      context,
+      client: callerClientWithCronCreatorAuthority(grant),
+    });
+
+    expectCronSuccess(result.respond);
+    expect(context.committedRuntimeAuthorities).toEqual([runtimeAuthority]);
+    revokeCronCreatorAuthorityRunScope(scope);
+  });
+
   it("rejects a mismatched cron.add runId without consuming the exact grant", async () => {
     const scope = createCronCreatorAuthorityRunScope("run-add");
     const grant = mintCronCreatorAuthorityGrant(scope);