diff --git a/src/agents/tools/cron-tool-schema.ts b/src/agents/tools/cron-tool-schema.ts
index a1389a156fcf..f5edcc3082ec 100644
--- a/src/agents/tools/cron-tool-schema.ts
+++ b/src/agents/tools/cron-tool-schema.ts
@@ -46,6 +46,7 @@ const CRON_DELIVERY_MODES = ["none", "announce", "webhook"] as const;
 const CRON_RUN_MODES = ["due", "force"] as const;
 
 type CronToolSchemaOptions = {
+  agentSessionKey?: string;
   /**
    * Whether cron.triggers.enabled is on for this deployment. When false, the
    * trigger-gated surfaces (job trigger, script payloads, stream
@@ -278,8 +279,10 @@ function createCronFailureAlertSchema(): TSchema {
   );
 }
 
-function createCronJobObjectSchema(params: { triggersEnabled: boolean }): TSchema {
-  return Type.Optional(
+// Flattened schema: runtime validates per-action requirements.
+export function createCronToolSchema(options?: CronToolSchemaOptions): TSchema {
+  const triggersEnabled = options?.triggersEnabled !== false;
+  const job = Type.Optional(
     Type.Object(
       {
         name: Type.Optional(Type.String({ description: "Job name" })),
@@ -304,18 +307,21 @@ function createCronJobObjectSchema(params: { triggersEnabled: boolean }): TSchem
             { additionalProperties: false },
           ),
         ),
-        schedule: createCronScheduleSchema({ triggersEnabled: params.triggersEnabled }),
+        schedule: createCronScheduleSchema({ triggersEnabled }),
         pacing: createCronPacingSchema(),
-        ...(params.triggersEnabled ? { trigger: createCronTriggerSchema() } : {}),
+        ...(triggersEnabled ? { trigger: createCronTriggerSchema() } : {}),
         sessionTarget: Type.Optional(
           Type.String({
             description: "main | isolated | current (agentTurn default) | session:<id>",
           }),
         ),
         wakeMode: optionalStringEnum(CRON_WAKE_MODES, { description: "Wake timing" }),
-        payload: createCronPayloadSchema({ triggersEnabled: params.triggersEnabled }),
+        payload: createCronPayloadSchema({ triggersEnabled }),
         delivery: createCronDeliverySchema(),
-        agentId: nullableStringSchema("Agent id, or null to clear it"),
+        // Session-scoped updates reject retargeting; do not advertise it to the model.
+        ...(!options?.agentSessionKey?.trim()
+          ? { agentId: nullableStringSchema("Agent id, or null to clear it") }
+          : {}),
         description: Type.Optional(Type.String({ description: "Human description" })),
         enabled: Type.Optional(Type.Boolean()),
         deleteAfterRun: Type.Optional(Type.Boolean({ description: "Delete after first run" })),
@@ -329,11 +335,6 @@ function createCronJobObjectSchema(params: { triggersEnabled: boolean }): TSchem
       },
     ),
   );
-}
-
-// Flattened schema: runtime validates per-action requirements.
-export function createCronToolSchema(options?: CronToolSchemaOptions): TSchema {
-  const triggersEnabled = options?.triggersEnabled !== false;
   return Type.Object(
     {
       action: stringEnum(CRON_ACTIONS),
@@ -346,7 +347,7 @@ export function createCronToolSchema(options?: CronToolSchemaOptions): TSchema {
       offset: optionalNonNegativeIntegerSchema({
         description: 'Job offset for action="list"; use nextOffset to load the next page',
       }),
-      job: createCronJobObjectSchema({ triggersEnabled }),
+      job,
       jobId: Type.Optional(Type.String()),
       id: Type.Optional(Type.String()),
       in: Type.Optional(
diff --git a/src/agents/tools/cron-tool.schema.test.ts b/src/agents/tools/cron-tool.schema.test.ts
index 667260f15028..fbbc6b842cbd 100644
--- a/src/agents/tools/cron-tool.schema.test.ts
+++ b/src/agents/tools/cron-tool.schema.test.ts
@@ -110,6 +110,26 @@ describe("createCronToolSchema", () => {
     expect(schemaRecord.properties).not.toHaveProperty("patch");
   });
 
+  it.each([undefined, "", " \t ", "agent:main:telegram:direct:alice", " agent:main:main "])(
+    "advertises job retargeting only without session scope (%j)",
+    (agentSessionKey) => {
+      const toolSchema = createCronTool({ agentSessionKey, agentId: "main" }).parameters;
+      for (const projected of [
+        toolSchema,
+        normalizeToolParameterSchema(toolSchema, { modelProvider: "gemini" }),
+        normalizeToolParameterSchema(toolSchema, {
+          modelCompat: { toolSchemaProfile: "llamacpp" },
+        }),
+      ]) {
+        const record = projected as unknown as Record<string, unknown>;
+        expect(keysAt(record, "job").includes("agentId")).toBe(!agentSessionKey?.trim());
+        expect(propertyAt(record, "agentId")).toMatchObject({ type: "string" });
+        expect(propertyAt(record, "agentId")?.description).toContain("list");
+        expect(propertyAt(record, "agentId")?.description).toContain("wake");
+      }
+    },
+  );
+
   it("exposes next_check with its relative duration parameter", () => {
     expect(Value.Check(schema, { action: "next_check", in: "15m" })).toBe(true);
     expect(propertyAt(schemaRecord, "in")?.description).toContain("next_check");
diff --git a/src/agents/tools/cron-tool.test.ts b/src/agents/tools/cron-tool.test.ts
index 11fc2c189f22..bda81feb74c6 100644
--- a/src/agents/tools/cron-tool.test.ts
+++ b/src/agents/tools/cron-tool.test.ts
@@ -2976,37 +2976,47 @@ describe("cron tool", () => {
     });
   });
 
-  it("rejects agentId retargeting on update", async () => {
-    const tool = createTestCronTool({
-      agentSessionKey: "agent:agent-123:telegram:direct:channing",
-    });
+  it.each(["agent-123", "worker", null])(
+    "rejects scoped update agentId %j in either shape",
+    async (agentId) => {
+      const tool = createTestCronTool({
+        agentSessionKey: "agent:agent-123:telegram:direct:channing",
+      });
 
-    await expect(
-      tool.execute("call-update-agent-id", {
-        action: "update",
-        id: "job-1",
-        job: { agentId: "worker" },
-      }),
-    ).rejects.toThrow("automation patch agentId cannot be changed");
-    expect(callGatewayMock).not.toHaveBeenCalled();
-  });
+      for (const fields of [{ job: { agentId, enabled: false } }, { agentId, enabled: false }]) {
+        await expect(
+          tool.execute("call-update-agent-id", {
+            action: "update",
+            id: "job-1",
+            ...fields,
+          }),
+        ).rejects.toThrow("automation patch agentId cannot be changed");
+      }
+      expect(callGatewayMock).not.toHaveBeenCalled();
+    },
+  );
 
-  it("allows unscoped operator cron.update agentId retargeting", async () => {
+  it.each([
+    ["nested", "worker"],
+    ["flat", "worker"],
+    ["nested", null],
+    ["flat", null],
+  ])("allows unscoped operator %s agentId %j updates", async (shape, agentId) => {
     callGatewayMock.mockResolvedValueOnce({ ok: true });
     const tool = createTestCronTool();
 
     await tool.execute("call-unscoped-update-agent-id", {
       action: "update",
       id: "job-1",
-      job: { agentId: "worker" },
+      ...(shape === "nested" ? { job: { agentId } } : { agentId }),
     });
 
     const params = expectSingleGatewayCallMethod("cron.update") as
-      | { id?: string; patch?: { agentId?: string } }
+      | { id?: string; patch?: { agentId?: string | null } }
       | undefined;
     expect(params).toEqual({
       id: "job-1",
-      patch: { agentId: "worker" },
+      patch: { agentId },
     });
   });
 
diff --git a/src/agents/tools/cron-tool.ts b/src/agents/tools/cron-tool.ts
index 0d63f16d7b9b..309292f96735 100644
--- a/src/agents/tools/cron-tool.ts
+++ b/src/agents/tools/cron-tool.ts
@@ -6,7 +6,6 @@
 import { normalizeLowercaseStringOrEmpty } from "@openclaw/normalization-core/string-coerce";
 import { parseDurationMs } from "../../cli/parse-duration.js";
 import { getRuntimeConfig } from "../../config/config.js";
-import type { OpenClawConfig } from "../../config/types.openclaw.js";
 import { resolveCronCreationDelivery } from "../../cron/delivery-context.js";
 import { assertCronDeliveryInputNonBlankFields } from "../../cron/delivery-target-validation.js";
 import { normalizeCronJobCreate, normalizeCronJobPatch } from "../../cron/normalize.js";
@@ -211,22 +210,19 @@ FAILURE ALERTS: jobs with a failure route default to alerting after 2 consecutiv
 Job wakeMode (main jobs): "now"(default)|"next-heartbeat". Restricted automation-run sessions: self status/list/get/runs/remove + own next_check only. failureAlert {...}|false disables. jobId canonical (id=compat). contextMessages 0-10 embeds recent chat lines into reminder text.`;
 }
 
-// Trigger-gated surfaces are advertised by default. Only an explicit false
-// narrows the model-facing surface, matching the scheduler's own gate in
-// cron/service/jobs-validation.ts.
-function resolveCronTriggersEnabled(config?: OpenClawConfig): boolean {
-  return config?.cron?.triggers?.enabled !== false;
-}
-
 export function createCronTool(opts?: CronToolOptions, deps?: CronToolDeps): AnyAgentTool {
   const callGateway = deps?.callGatewayTool ?? callGatewayTool;
-  const triggersEnabled = resolveCronTriggersEnabled(opts?.config);
+  // Trigger-gated surfaces default on, matching cron/service/jobs-validation.ts.
+  const triggersEnabled = opts?.config?.cron?.triggers?.enabled !== false;
   const tool: AnyAgentTool = {
     label: "Automations",
     name: AUTOMATIONS_TOOL_NAME,
     displaySummary: CRON_TOOL_DISPLAY_SUMMARY,
     description: buildCronToolDescription({ triggersEnabled }),
-    parameters: createCronToolSchema({ triggersEnabled }),
+    parameters: createCronToolSchema({
+      agentSessionKey: opts?.agentSessionKey,
+      triggersEnabled,
+    }),
     execute: async (_toolCallId, args, operationSignal) => {
       operationSignal?.throwIfAborted();
       const params = args as Record<string, unknown>;
diff --git a/test/fixtures/agents/prompt-snapshots/codex-runtime-happy-path/codex-dynamic-tools.telegram-direct.json b/test/fixtures/agents/prompt-snapshots/codex-runtime-happy-path/codex-dynamic-tools.telegram-direct.json
index c5d6787154c1..b5ab5f574205 100644
--- a/test/fixtures/agents/prompt-snapshots/codex-runtime-happy-path/codex-dynamic-tools.telegram-direct.json
+++ b/test/fixtures/agents/prompt-snapshots/codex-runtime-happy-path/codex-dynamic-tools.telegram-direct.json
@@ -327,17 +327,6 @@
               "additionalProperties": true,
               "description": "Job fields. action=\"add\": full job. action=\"update\": partial patch — only supplied fields change; null clears.",
               "properties": {
-                "agentId": {
-                  "anyOf": [
-                    {
-                      "type": "string"
-                    },
-                    {
-                      "type": "null"
-                    }
-                  ],
-                  "description": "Agent id, or null to clear it"
-                },
                 "declarationKey": {
                   "description": "Idempotent declaration key (add only).",
                   "maxLength": 200,
diff --git a/test/fixtures/agents/prompt-snapshots/codex-runtime-happy-path/discord-group-codex-message-tool.md.diff b/test/fixtures/agents/prompt-snapshots/codex-runtime-happy-path/discord-group-codex-message-tool.md.diff
index 7e7c69317e6b..8fad74e112fe 100644
--- a/test/fixtures/agents/prompt-snapshots/codex-runtime-happy-path/discord-group-codex-message-tool.md.diff
+++ b/test/fixtures/agents/prompt-snapshots/codex-runtime-happy-path/discord-group-codex-message-tool.md.diff
@@ -1,5 +1,5 @@
---- telegram-direct-codex-message-tool.md	sha256=0ffd165216012ff63244b6d9b39269a3a8775bdacbbc1f1bcb52c8a6dfb8b03e
-+++ discord-group-codex-message-tool.md	sha256=5d6e349160a987be177164637f54004e67108496f6cc4f511188165b1b917c1f
+--- telegram-direct-codex-message-tool.md	sha256=3a723ba690b1938399f61d2dde771a424a77a34ae2aee1c3c567de3d3100ec5f
++++ discord-group-codex-message-tool.md	sha256=3a611870a62e573efb58fe34f9c88598bb06193e0599f876f3996b9f8af2466c
 @@ -1,1 +1,1 @@
 -# Telegram Direct Codex Message Tool Turn
 +# Discord Group Codex Message Tool Turn
@@ -29,10 +29,10 @@
 -    "dynamicToolsFrom": "codex-dynamic-tools.telegram-direct.json",
 +    "dynamicToolsFrom": "codex-dynamic-tools.discord-group.json",
 @@ -235,2 +235,2 @@
--    "chars": 54985,
--    "roughTokens": 13747
-+    "chars": 55293,
-+    "roughTokens": 13824
+-    "chars": 54657,
+-    "roughTokens": 13665
++    "chars": 54965,
++    "roughTokens": 13742
 @@ -239,2 +239,2 @@
 -    "chars": 3518,
 -    "roughTokens": 880
@@ -44,10 +44,10 @@
 +    "chars": 28944,
 +    "roughTokens": 7236
 @@ -247,2 +247,2 @@
--    "chars": 82451,
--    "roughTokens": 20613
-+    "chars": 84239,
-+    "roughTokens": 21060
+-    "chars": 82123,
+-    "roughTokens": 20531
++    "chars": 83911,
++    "roughTokens": 20978
 @@ -251,2 +251,2 @@
 -    "chars": 863,
 -    "roughTokens": 216
diff --git a/test/fixtures/agents/prompt-snapshots/codex-runtime-happy-path/telegram-direct-codex-message-tool.md b/test/fixtures/agents/prompt-snapshots/codex-runtime-happy-path/telegram-direct-codex-message-tool.md
index 15a152a006b1..bd30a591291d 100644
--- a/test/fixtures/agents/prompt-snapshots/codex-runtime-happy-path/telegram-direct-codex-message-tool.md
+++ b/test/fixtures/agents/prompt-snapshots/codex-runtime-happy-path/telegram-direct-codex-message-tool.md
@@ -232,8 +232,8 @@ This is the deterministic model-bound layer stack OpenClaw can snapshot for the
     "roughTokens": 0
   },
   "dynamicToolsJson": {
-    "chars": 54985,
-    "roughTokens": 13747
+    "chars": 54657,
+    "roughTokens": 13665
   },
   "openClawDeveloperInstructions": {
     "chars": 3518,
@@ -244,8 +244,8 @@ This is the deterministic model-bound layer stack OpenClaw can snapshot for the
     "roughTokens": 6866
   },
   "totalWithDynamicToolsJson": {
-    "chars": 82451,
-    "roughTokens": 20613
+    "chars": 82123,
+    "roughTokens": 20531
   },
   "userInputText": {
     "chars": 863,
diff --git a/test/fixtures/agents/prompt-snapshots/codex-runtime-happy-path/telegram-heartbeat-codex-tool.md.diff b/test/fixtures/agents/prompt-snapshots/codex-runtime-happy-path/telegram-heartbeat-codex-tool.md.diff
index f4108b5529dc..d72a8c5a4938 100644
--- a/test/fixtures/agents/prompt-snapshots/codex-runtime-happy-path/telegram-heartbeat-codex-tool.md.diff
+++ b/test/fixtures/agents/prompt-snapshots/codex-runtime-happy-path/telegram-heartbeat-codex-tool.md.diff
@@ -1,5 +1,5 @@
---- telegram-direct-codex-message-tool.md	sha256=0ffd165216012ff63244b6d9b39269a3a8775bdacbbc1f1bcb52c8a6dfb8b03e
-+++ telegram-heartbeat-codex-tool.md	sha256=779e4c800001a1e8f39964284b8de70d07694fbfc60c5a17bdefe7e1dc2b25f7
+--- telegram-direct-codex-message-tool.md	sha256=3a723ba690b1938399f61d2dde771a424a77a34ae2aee1c3c567de3d3100ec5f
++++ telegram-heartbeat-codex-tool.md	sha256=6727aba7851d91878e03b76e03fc9642f88eca88f4ee5859ba75f47046dbeea3
 @@ -1,1 +1,1 @@
 -# Telegram Direct Codex Message Tool Turn
 +# Telegram Direct Codex Heartbeat Tool Turn
@@ -32,20 +32,20 @@
 -    "dynamicToolsFrom": "codex-dynamic-tools.telegram-direct.json",
 +    "dynamicToolsFrom": "codex-dynamic-tools.heartbeat-turn.json",
 @@ -235,2 +230,2 @@
--    "chars": 54985,
--    "roughTokens": 13747
-+    "chars": 56478,
-+    "roughTokens": 14120
+-    "chars": 54657,
+-    "roughTokens": 13665
++    "chars": 56150,
++    "roughTokens": 14038
 @@ -243,2 +238,2 @@
 -    "chars": 27464,
 -    "roughTokens": 6866
 +    "chars": 27806,
 +    "roughTokens": 6952
 @@ -247,2 +242,2 @@
--    "chars": 82451,
--    "roughTokens": 20613
-+    "chars": 84286,
-+    "roughTokens": 21072
+-    "chars": 82123,
+-    "roughTokens": 20531
++    "chars": 83958,
++    "roughTokens": 20990
 @@ -251,2 +246,2 @@
 -    "chars": 863,
 -    "roughTokens": 216