diff --git a/src/agents/bash-tools.exec-types.ts b/src/agents/bash-tools.exec-types.ts
index 8e0b945dad6..e834457f146 100644
--- a/src/agents/bash-tools.exec-types.ts
+++ b/src/agents/bash-tools.exec-types.ts
@@ -2,6 +2,7 @@ import type { ExecApprovalDecision } from "../infra/exec-approvals.js";
 import type { ExecAsk, ExecHost, ExecSecurity, ExecTarget } from "../infra/exec-approvals.js";
 import type { SafeBinProfileFixture } from "../infra/exec-safe-bin-policy.js";
 import type { BashSandboxConfig } from "./bash-tools.shared.js";
+import type { EmbeddedFullAccessBlockedReason } from "./pi-embedded-runner/types.js";
 
 export type ExecToolDefaults = {
   hasCronTool?: boolean;
@@ -37,6 +38,8 @@ export type ExecElevatedDefaults = {
   enabled: boolean;
   allowed: boolean;
   defaultLevel: "on" | "off" | "ask" | "full";
+  fullAccessAvailable?: boolean;
+  fullAccessBlockedReason?: EmbeddedFullAccessBlockedReason;
 };
 
 export type ExecToolDetails =
diff --git a/src/agents/pi-embedded-runner.buildembeddedsandboxinfo.test.ts b/src/agents/pi-embedded-runner.buildembeddedsandboxinfo.test.ts
index e71cdb94e30..0cf6ca6edb2 100644
--- a/src/agents/pi-embedded-runner.buildembeddedsandboxinfo.test.ts
+++ b/src/agents/pi-embedded-runner.buildembeddedsandboxinfo.test.ts
@@ -77,7 +77,40 @@ describe("buildEmbeddedSandboxInfo", () => {
       workspaceAccess: "none",
       agentWorkspaceMount: undefined,
       hostBrowserAllowed: false,
-      elevated: { allowed: true, defaultLevel: "on" },
+      elevated: {
+        allowed: true,
+        defaultLevel: "on",
+        fullAccessAvailable: true,
+      },
+    });
+  });
+
+  it("keeps full-access unavailability truth when provided", () => {
+    const sandbox = createSandboxContext();
+
+    expect(
+      buildEmbeddedSandboxInfo(sandbox, {
+        enabled: true,
+        allowed: true,
+        defaultLevel: "full",
+        fullAccessAvailable: false,
+        fullAccessBlockedReason: "runtime",
+      }),
+    ).toEqual({
+      enabled: true,
+      workspaceDir: "/tmp/openclaw-sandbox",
+      containerWorkspaceDir: "/workspace",
+      workspaceAccess: "none",
+      agentWorkspaceMount: undefined,
+      browserBridgeUrl: "http://localhost:9222",
+      browserNoVncUrl: "http://localhost:6080",
+      hostBrowserAllowed: true,
+      elevated: {
+        allowed: true,
+        defaultLevel: "full",
+        fullAccessAvailable: false,
+        fullAccessBlockedReason: "runtime",
+      },
     });
   });
 });
diff --git a/src/agents/pi-embedded-runner/sandbox-info.ts b/src/agents/pi-embedded-runner/sandbox-info.ts
index 35f6b5d284e..331dd9e0071 100644
--- a/src/agents/pi-embedded-runner/sandbox-info.ts
+++ b/src/agents/pi-embedded-runner/sandbox-info.ts
@@ -1,6 +1,34 @@
 import type { ExecElevatedDefaults } from "../bash-tools.js";
 import type { resolveSandboxContext } from "../sandbox.js";
-import type { EmbeddedSandboxInfo } from "./types.js";
+import type { EmbeddedFullAccessBlockedReason, EmbeddedSandboxInfo } from "./types.js";
+
+export function resolveEmbeddedFullAccessState(params: {
+  sandboxEnabled: boolean;
+  execElevated?: ExecElevatedDefaults;
+}): { available: boolean; blockedReason?: EmbeddedFullAccessBlockedReason } {
+  if (!params.sandboxEnabled) {
+    return {
+      available: false,
+      blockedReason: "runtime",
+    };
+  }
+  if (params.execElevated?.fullAccessAvailable === true) {
+    return { available: true };
+  }
+  if (params.execElevated?.fullAccessAvailable === false) {
+    return {
+      available: false,
+      blockedReason: params.execElevated.fullAccessBlockedReason ?? "host-policy",
+    };
+  }
+  if (!params.execElevated?.enabled || !params.execElevated.allowed) {
+    return {
+      available: false,
+      blockedReason: "host-policy",
+    };
+  }
+  return { available: true };
+}
 
 export function buildEmbeddedSandboxInfo(
   sandbox?: Awaited<ReturnType<typeof resolveSandboxContext>>,
@@ -9,7 +37,12 @@ export function buildEmbeddedSandboxInfo(
   if (!sandbox?.enabled) {
     return undefined;
   }
+  const elevatedConfigured = execElevated?.enabled === true;
   const elevatedAllowed = Boolean(execElevated?.enabled && execElevated.allowed);
+  const fullAccess = resolveEmbeddedFullAccessState({
+    sandboxEnabled: true,
+    execElevated,
+  });
   return {
     enabled: true,
     workspaceDir: sandbox.workspaceDir,
@@ -18,11 +51,15 @@ export function buildEmbeddedSandboxInfo(
     agentWorkspaceMount: sandbox.workspaceAccess === "ro" ? "/agent" : undefined,
     browserBridgeUrl: sandbox.browser?.bridgeUrl,
     hostBrowserAllowed: sandbox.browserAllowHostControl,
-    ...(elevatedAllowed
+    ...(elevatedConfigured
       ? {
           elevated: {
-            allowed: true,
+            allowed: elevatedAllowed,
             defaultLevel: execElevated?.defaultLevel ?? "off",
+            fullAccessAvailable: fullAccess.available,
+            ...(fullAccess.blockedReason
+              ? { fullAccessBlockedReason: fullAccess.blockedReason }
+              : {}),
           },
         }
       : {}),
diff --git a/src/agents/pi-embedded-runner/types.ts b/src/agents/pi-embedded-runner/types.ts
index 96ac367b33e..1c01c40230f 100644
--- a/src/agents/pi-embedded-runner/types.ts
+++ b/src/agents/pi-embedded-runner/types.ts
@@ -93,6 +93,8 @@ export type EmbeddedPiCompactResult = {
   };
 };
 
+export type EmbeddedFullAccessBlockedReason = "sandbox" | "host-policy" | "channel" | "runtime";
+
 export type EmbeddedSandboxInfo = {
   enabled: boolean;
   workspaceDir?: string;
@@ -104,5 +106,7 @@ export type EmbeddedSandboxInfo = {
   elevated?: {
     allowed: boolean;
     defaultLevel: "on" | "off" | "ask" | "full";
+    fullAccessAvailable: boolean;
+    fullAccessBlockedReason?: EmbeddedFullAccessBlockedReason;
   };
 };
diff --git a/src/agents/system-prompt.test.ts b/src/agents/system-prompt.test.ts
index 38f05f051c1..9e1bd76304e 100644
--- a/src/agents/system-prompt.test.ts
+++ b/src/agents/system-prompt.test.ts
@@ -939,7 +939,7 @@ describe("buildAgentSystemPrompt", () => {
         containerWorkspaceDir: "/workspace",
         workspaceAccess: "ro",
         agentWorkspaceMount: "/agent",
-        elevated: { allowed: true, defaultLevel: "on" },
+        elevated: { allowed: true, defaultLevel: "on", fullAccessAvailable: true },
       },
     });
 
@@ -957,6 +957,35 @@ describe("buildAgentSystemPrompt", () => {
     expect(prompt).toContain("Current elevated level: on");
   });
 
+  it("does not advertise /elevated full when auto-approved full access is unavailable", () => {
+    const prompt = buildAgentSystemPrompt({
+      workspaceDir: "/tmp/openclaw",
+      sandboxInfo: {
+        enabled: true,
+        workspaceDir: "/tmp/sandbox",
+        containerWorkspaceDir: "/workspace",
+        workspaceAccess: "ro",
+        agentWorkspaceMount: "/agent",
+        elevated: {
+          allowed: true,
+          defaultLevel: "full",
+          fullAccessAvailable: false,
+          fullAccessBlockedReason: "runtime",
+        },
+      },
+    });
+
+    expect(prompt).toContain("Elevated exec is available for this session.");
+    expect(prompt).toContain("User can toggle with /elevated on|off|ask.");
+    expect(prompt).not.toContain("User can toggle with /elevated on|off|ask|full.");
+    expect(prompt).toContain(
+      "Auto-approved /elevated full is unavailable here (runtime constraints).",
+    );
+    expect(prompt).toContain(
+      "Current elevated level: full (full auto-approval unavailable here; use ask/on instead).",
+    );
+  });
+
   it("includes reaction guidance when provided", () => {
     const prompt = buildAgentSystemPrompt({
       workspaceDir: "/tmp/openclaw",
diff --git a/src/agents/system-prompt.ts b/src/agents/system-prompt.ts
index 0e016f573a4..6acaeb55275 100644
--- a/src/agents/system-prompt.ts
+++ b/src/agents/system-prompt.ts
@@ -12,7 +12,10 @@ import {
 import { listDeliverableMessageChannels } from "../utils/message-channel.js";
 import type { ResolvedTimeFormat } from "./date-time.js";
 import type { EmbeddedContextFile } from "./pi-embedded-helpers.js";
-import type { EmbeddedSandboxInfo } from "./pi-embedded-runner/types.js";
+import type {
+  EmbeddedFullAccessBlockedReason,
+  EmbeddedSandboxInfo,
+} from "./pi-embedded-runner/types.js";
 import {
   normalizePromptCapabilityIds,
   normalizeStructuredPromptSection,
@@ -336,6 +339,19 @@ function buildExecApprovalPromptGuidance(params: {
   return "When exec returns approval-pending, include the concrete /approve command from tool output as plain chat text for the user, and do not ask for a different or rotated code.";
 }
 
+function formatFullAccessBlockedReason(reason?: EmbeddedFullAccessBlockedReason): string {
+  if (reason === "host-policy") {
+    return "host policy";
+  }
+  if (reason === "channel") {
+    return "channel constraints";
+  }
+  if (reason === "sandbox") {
+    return "sandbox constraints";
+  }
+  return "runtime constraints";
+}
+
 export function buildAgentSystemPrompt(params: {
   workspaceDir: string;
   defaultThinkLevel?: ThinkLevel;
@@ -470,6 +486,11 @@ export function buildAgentSystemPrompt(params: {
   const sanitizedSandboxContainerWorkspace = sandboxContainerWorkspace
     ? sanitizeForPromptLiteral(sandboxContainerWorkspace)
     : "";
+  const elevated = params.sandboxInfo?.elevated;
+  const fullAccessBlockedReasonLabel =
+    elevated?.fullAccessAvailable === false
+      ? formatFullAccessBlockedReason(elevated.fullAccessBlockedReason)
+      : undefined;
   const displayWorkspaceDir =
     params.sandboxInfo?.enabled && sanitizedSandboxContainerWorkspace
       ? sanitizedSandboxContainerWorkspace
@@ -652,17 +673,35 @@ export function buildAgentSystemPrompt(params: {
             : params.sandboxInfo.hostBrowserAllowed === false
               ? "Host browser control: blocked."
               : "",
-          params.sandboxInfo.elevated?.allowed
+          elevated?.allowed
             ? "Elevated exec is available for this session."
-            : "",
-          params.sandboxInfo.elevated?.allowed
+            : elevated
+              ? "Elevated exec is unavailable for this session."
+              : "",
+          elevated?.allowed && elevated.fullAccessAvailable
             ? "User can toggle with /elevated on|off|ask|full."
             : "",
-          params.sandboxInfo.elevated?.allowed
+          elevated?.allowed && !elevated.fullAccessAvailable
+            ? "User can toggle with /elevated on|off|ask."
+            : "",
+          elevated?.allowed && elevated.fullAccessAvailable
             ? "You may also send /elevated on|off|ask|full when needed."
             : "",
-          params.sandboxInfo.elevated?.allowed
-            ? `Current elevated level: ${params.sandboxInfo.elevated.defaultLevel} (ask runs exec on host with approvals; full auto-approves).`
+          elevated?.allowed && !elevated.fullAccessAvailable
+            ? "You may also send /elevated on|off|ask when needed."
+            : "",
+          elevated?.fullAccessAvailable === false
+            ? `Auto-approved /elevated full is unavailable here (${fullAccessBlockedReasonLabel}).`
+            : "",
+          elevated?.allowed && elevated.fullAccessAvailable
+            ? `Current elevated level: ${elevated.defaultLevel} (ask runs exec on host with approvals; full auto-approves).`
+            : elevated?.allowed
+              ? `Current elevated level: ${elevated.defaultLevel} (full auto-approval unavailable here; use ask/on instead).`
+              : elevated
+                ? "Current elevated level: off (elevated exec unavailable)."
+                : "",
+          elevated && !elevated.allowed
+            ? "Do not tell the user to switch to /elevated full in this session."
             : "",
         ]
           .filter(Boolean)
diff --git a/src/auto-reply/reply/get-reply-run.exec-hint.test.ts b/src/auto-reply/reply/get-reply-run.exec-hint.test.ts
index b8149ca61cc..356c52f6350 100644
--- a/src/auto-reply/reply/get-reply-run.exec-hint.test.ts
+++ b/src/auto-reply/reply/get-reply-run.exec-hint.test.ts
@@ -38,4 +38,17 @@ describe("buildExecOverridePromptHint", () => {
     );
     expect(result).toContain("Current elevated level: full.");
   });
+
+  it("warns when auto-approved full access is unavailable", () => {
+    const result = buildExecOverridePromptHint({
+      elevatedLevel: "full",
+      fullAccessAvailable: false,
+      fullAccessBlockedReason: "runtime",
+    });
+
+    expect(result).toContain("Current elevated level: full.");
+    expect(result).toContain(
+      "Auto-approved /elevated full is unavailable here (runtime). Use ask/on instead and do not ask the user to switch to /elevated full.",
+    );
+  });
 });
diff --git a/src/auto-reply/reply/get-reply-run.ts b/src/auto-reply/reply/get-reply-run.ts
index 8ec7f23f841..fba2b155a8c 100644
--- a/src/auto-reply/reply/get-reply-run.ts
+++ b/src/auto-reply/reply/get-reply-run.ts
@@ -2,6 +2,9 @@ import crypto from "node:crypto";
 import { resolveSessionAuthProfileOverride } from "../../agents/auth-profiles/session-override.js";
 import type { ExecToolDefaults } from "../../agents/bash-tools.js";
 import { resolveFastModeState } from "../../agents/fast-mode.js";
+import { resolveEmbeddedFullAccessState } from "../../agents/pi-embedded-runner/sandbox-info.js";
+import type { EmbeddedFullAccessBlockedReason } from "../../agents/pi-embedded-runner/types.js";
+import { resolveSandboxRuntimeStatus } from "../../agents/sandbox.js";
 import type { OpenClawConfig } from "../../config/config.js";
 import { resolveGroupSessionKey } from "../../config/sessions/group.js";
 import {
@@ -53,6 +56,8 @@ type ExecOverrides = Pick<ExecToolDefaults, "host" | "security" | "ask" | "node"
 export function buildExecOverridePromptHint(params: {
   execOverrides?: ExecOverrides;
   elevatedLevel: ElevatedLevel;
+  fullAccessAvailable?: boolean;
+  fullAccessBlockedReason?: EmbeddedFullAccessBlockedReason;
 }): string | undefined {
   const exec = params.execOverrides;
   if (!exec && params.elevatedLevel === "off") {
@@ -69,12 +74,19 @@ export function buildExecOverridePromptHint(params: {
       ? `Current session exec defaults: ${parts.join(" ")}.`
       : "Current session exec defaults: inherited from configured agent/global defaults.";
   const elevatedLine = `Current elevated level: ${params.elevatedLevel}.`;
+  const fullAccessLine =
+    params.fullAccessAvailable === false
+      ? `Auto-approved /elevated full is unavailable here (${params.fullAccessBlockedReason ?? "runtime"}). Use ask/on instead and do not ask the user to switch to /elevated full.`
+      : undefined;
   return [
     "## Current Exec Session State",
     execLine,
     elevatedLine,
+    fullAccessLine,
     "If the user asks to run a command, use the current exec state above. Do not assume a prior denial still applies after `/exec` or `/elevated` changed.",
-  ].join("\n");
+  ]
+    .filter(Boolean)
+    .join("\n");
 }
 
 let piEmbeddedRuntimePromise: Promise<typeof import("../../agents/pi-embedded.runtime.js")> | null =
@@ -213,6 +225,17 @@ export async function runPreparedReply(
     cfg,
     isFastTestEnv: process.env.OPENCLAW_TEST_FAST === "1",
   });
+  const fullAccessState = resolveEmbeddedFullAccessState({
+    sandboxEnabled: resolveSandboxRuntimeStatus({
+      cfg,
+      sessionKey: ctx.SessionKey,
+    }).sandboxed,
+    execElevated: {
+      enabled: elevatedEnabled,
+      allowed: elevatedAllowed,
+      defaultLevel: resolvedElevatedLevel ?? "off",
+    },
+  });
   let currentSystemSent = systemSent;
 
   const isFirstTurnInSession = isNewSession || !currentSystemSent;
@@ -261,6 +284,8 @@ export async function runPreparedReply(
     buildExecOverridePromptHint({
       execOverrides,
       elevatedLevel: resolvedElevatedLevel,
+      fullAccessAvailable: fullAccessState.available,
+      fullAccessBlockedReason: fullAccessState.blockedReason,
     }),
   ].filter(Boolean);
   const baseBody = sessionCtx.BodyStripped ?? sessionCtx.Body ?? "";
@@ -609,6 +634,10 @@ export async function runPreparedReply(
         enabled: elevatedEnabled,
         allowed: elevatedAllowed,
         defaultLevel: resolvedElevatedLevel ?? "off",
+        fullAccessAvailable: fullAccessState.available,
+        ...(fullAccessState.blockedReason
+          ? { fullAccessBlockedReason: fullAccessState.blockedReason }
+          : {}),
       },
       timeoutMs,
       blockReplyBreak: resolvedBlockStreamingBreak,