diff --git a/apps/shared/OpenClawKit/Sources/OpenClawKit/Resources/tool-display.json b/apps/shared/OpenClawKit/Sources/OpenClawKit/Resources/tool-display.json
index c4591fdeed03..712cd8d2fb6a 100644
--- a/apps/shared/OpenClawKit/Sources/OpenClawKit/Resources/tool-display.json
+++ b/apps/shared/OpenClawKit/Sources/OpenClawKit/Resources/tool-display.json
@@ -74,6 +74,17 @@
         "cwd"
       ]
     },
+    "portal": {
+      "emoji": "🌐",
+      "title": "Portal",
+      "detailKeys": [
+        "action",
+        "port",
+        "id",
+        "title",
+        "path"
+      ]
+    },
     "process": {
       "emoji": "🧰",
       "title": "Process",
diff --git a/src/agents/core-tool-factory-descriptors.ts b/src/agents/core-tool-factory-descriptors.ts
index 592431c96e7b..e9579b03853f 100644
--- a/src/agents/core-tool-factory-descriptors.ts
+++ b/src/agents/core-tool-factory-descriptors.ts
@@ -54,6 +54,7 @@ const CORE_TOOL_FACTORY_DESCRIPTORS = [
   { name: "create_goal", family: "openclaw" },
   { name: "subagents", family: "openclaw" },
   { name: "terminal", family: "openclaw" },
+  { name: "portal", family: "openclaw" },
   { name: "transcripts", family: "openclaw" },
   { name: "tts", family: "openclaw" },
   { name: "update_goal", family: "openclaw" },
diff --git a/src/agents/openclaw-tools.registration.test.ts b/src/agents/openclaw-tools.registration.test.ts
index 6d9edaa47052..d3ff804c46de 100644
--- a/src/agents/openclaw-tools.registration.test.ts
+++ b/src/agents/openclaw-tools.registration.test.ts
@@ -619,16 +619,25 @@ describe("gateway client capability tool filtering", () => {
     expect(hasTool(createOpenClawTools({ clientCaps: ["ui-commands"] }), "screen")).toBe(true);
   });
 
-  it("omits terminal for sandboxed agents", () => {
+  it("omits host UI runtime tools for sandboxed agents", () => {
     expect(hasTool(createOpenClawTools({ agentSessionKey: "agent:main:main" }), "terminal")).toBe(
       true,
     );
+    expect(hasTool(createOpenClawTools({ agentSessionKey: "agent:main:main" }), "portal")).toBe(
+      true,
+    );
     expect(
       hasTool(
         createOpenClawTools({ agentSessionKey: "agent:main:main", sandboxed: true }),
         "terminal",
       ),
     ).toBe(false);
+    expect(
+      hasTool(
+        createOpenClawTools({ agentSessionKey: "agent:main:main", sandboxed: true }),
+        "portal",
+      ),
+    ).toBe(false);
   });
 
   it("does not let tools.allow resurrect a gated tool for a channel run", () => {
diff --git a/src/agents/openclaw-tools.ts b/src/agents/openclaw-tools.ts
index b182bf5cd0a6..23f53248366a 100644
--- a/src/agents/openclaw-tools.ts
+++ b/src/agents/openclaw-tools.ts
@@ -76,6 +76,7 @@ import { createMusicGenerateTool } from "./tools/music-generate-tool.js";
 import { createNodesTool } from "./tools/nodes-tool.js";
 import { createOpenClawDelegateToolsForRun } from "./tools/openclaw-delegate-tool.js";
 import { createPdfTool } from "./tools/pdf-tool.js";
+import { createPortalTool } from "./tools/portal-tool.js";
 import { createScreenTool } from "./tools/screen-tool.js";
 import { createSessionStatusTool } from "./tools/session-status-tool.js";
 import { createSessionsHistoryTool } from "./tools/sessions-history-tool.js";
@@ -514,6 +515,7 @@ export function createOpenClawTools(
                   agentSessionKey: options?.runSessionKey ?? options?.agentSessionKey,
                   runId: options?.runId,
                 }),
+                createPortalTool(),
               ]),
         ]),
     ...(!embedded && taskKey && options?.taskSuggestionDeliveryMode === "gateway"
diff --git a/src/agents/tool-catalog.test.ts b/src/agents/tool-catalog.test.ts
index 01531db3d3ae..02e10daced2c 100644
--- a/src/agents/tool-catalog.test.ts
+++ b/src/agents/tool-catalog.test.ts
@@ -63,6 +63,7 @@ describe("tool-catalog", () => {
       "screen",
       "dashboard",
       "terminal",
+      "portal",
       "automations",
       "get_goal",
       "create_goal",
diff --git a/src/agents/tool-catalog.ts b/src/agents/tool-catalog.ts
index a2d97e5dda95..4d39e0753bcb 100644
--- a/src/agents/tool-catalog.ts
+++ b/src/agents/tool-catalog.ts
@@ -310,6 +310,14 @@ const CORE_TOOL_DEFINITIONS: CoreToolDefinition[] = [
     profiles: ["coding"],
     includeInOpenClawGroup: true,
   },
+  {
+    id: "portal",
+    label: "portal",
+    description: "Expose local web apps through the gateway",
+    sectionId: "ui",
+    profiles: ["coding"],
+    includeInOpenClawGroup: true,
+  },
   {
     id: "canvas",
     label: "canvas",
diff --git a/src/agents/tool-display-config.ts b/src/agents/tool-display-config.ts
index 4c2887f84098..7a1129fe1b5b 100644
--- a/src/agents/tool-display-config.ts
+++ b/src/agents/tool-display-config.ts
@@ -70,6 +70,11 @@ export const TOOL_DISPLAY_CONFIG: ToolDisplayConfig = {
       title: "Terminal",
       detailKeys: ["action", "sessionId", "command", "cwd"],
     },
+    portal: {
+      emoji: "🌐",
+      title: "Portal",
+      detailKeys: ["action", "port", "id", "title", "path"],
+    },
     process: {
       emoji: "🧰",
       title: "Process",
diff --git a/src/agents/tool-mutation-names.ts b/src/agents/tool-mutation-names.ts
index 10819a87c375..fe6640c593f5 100644
--- a/src/agents/tool-mutation-names.ts
+++ b/src/agents/tool-mutation-names.ts
@@ -21,6 +21,7 @@ const MUTATING_TOOL_NAMES = new Set([
   // Saved transcripts predate the rename; legacy names must stay classified.
   ...LEGACY_AUTOMATIONS_TOOL_NAMES,
   "gateway",
+  "portal",
   "canvas",
   "computer",
   "mobile_ui",
diff --git a/src/agents/tool-mutation.test.ts b/src/agents/tool-mutation.test.ts
index fc3875b1a350..0e3a8d5c56fd 100644
--- a/src/agents/tool-mutation.test.ts
+++ b/src/agents/tool-mutation.test.ts
@@ -20,6 +20,15 @@ describe("tool mutation helpers", () => {
     ).toBe(true);
   });
 
+  it("classifies portal list as replay-safe and portal mutations as mutating", () => {
+    expect(isMutatingToolCall("portal", { action: "list" })).toBe(false);
+    expect(isReplaySafeToolCall("portal", { action: "list" })).toBe(true);
+    for (const action of ["open", "close"]) {
+      expect(isMutatingToolCall("portal", { action }), action).toBe(true);
+      expect(isReplaySafeToolCall("portal", { action }), action).toBe(false);
+    }
+  });
+
   it("builds stable fingerprints for mutating calls and omits read-only calls", () => {
     const writeFingerprint = buildToolMutationState(
       "write",
diff --git a/src/agents/tool-mutation.ts b/src/agents/tool-mutation.ts
index 4ef5e5780feb..e9b75d9d1ec5 100644
--- a/src/agents/tool-mutation.ts
+++ b/src/agents/tool-mutation.ts
@@ -362,6 +362,8 @@ export function isMutatingToolCall(toolName: string, args: unknown): boolean {
       return typeof record?.model === "string" && record.model.trim().length > 0;
     case "gateway":
       return action == null || !GATEWAY_REPLAY_SAFE_ACTIONS.has(action);
+    case "portal":
+      return action !== "list";
     case "nodes":
       return action == null || !NODES_REPLAY_SAFE_ACTIONS.has(action);
     default: {
@@ -413,6 +415,8 @@ export function isReplaySafeToolCall(toolName: string, args: unknown): boolean {
       return action === "status";
     case "gateway":
       return action != null && GATEWAY_REPLAY_SAFE_ACTIONS.has(action);
+    case "portal":
+      return action === "list";
     case "nodes":
       return action != null && NODES_REPLAY_SAFE_ACTIONS.has(action);
     default: {
diff --git a/src/agents/tools/portal-tool.test.ts b/src/agents/tools/portal-tool.test.ts
new file mode 100644
index 000000000000..7a1c77722a54
--- /dev/null
+++ b/src/agents/tools/portal-tool.test.ts
@@ -0,0 +1,99 @@
+import { Value } from "typebox/value";
+import { describe, expect, it } from "vitest";
+import type {
+  PortalCloseResult,
+  PortalListResult,
+  PortalSummary,
+} from "../../../packages/gateway-protocol/src/index.js";
+import {
+  DEFAULT_GATEWAY_HTTP_TOOL_DENY,
+  GATEWAY_OWNER_ONLY_CORE_TOOLS,
+} from "../../security/dangerous-tools.js";
+import type { InProcessGatewayCaller } from "./in-process-gateway.js";
+import { createPortalTool } from "./portal-tool.js";
+
+const portal: PortalSummary = {
+  id: "p3000",
+  title: "App",
+  port: 3000,
+  listenPort: 43123,
+  tokenQuery: `openclaw_portal=${"a".repeat(64)}`,
+  url: "http://127.0.0.1:43123/",
+  createdAtMs: 1,
+};
+
+function recorder() {
+  const calls: Array<[string, Record<string, unknown>]> = [];
+  const callGateway: InProcessGatewayCaller = async <T>(
+    method: string,
+    params: Record<string, unknown>,
+  ): Promise<T> => {
+    calls.push([method, params]);
+    if (method === "portal.list") {
+      return { portals: [portal] } as PortalListResult as T;
+    }
+    if (method === "portal.close") {
+      return { closed: true } as PortalCloseResult as T;
+    }
+    return portal as T;
+  };
+  return { calls, callGateway };
+}
+
+describe("portal tool", () => {
+  it("uses a flat closed action schema and owner-only security gate", () => {
+    const tool = createPortalTool();
+    expect(tool.parameters).toMatchObject({
+      additionalProperties: false,
+      properties: { action: { enum: ["open", "list", "close"] } },
+    });
+    expect(Value.Check(tool.parameters, { action: "open", port: 3000, path: "/app" })).toBe(true);
+    expect(Value.Check(tool.parameters, { action: "open", port: 0 })).toBe(false);
+    expect(Value.Check(tool.parameters, { action: "open", port: 3000, path: "app" })).toBe(false);
+    expect(Value.Check(tool.parameters, { action: "unknown" })).toBe(false);
+    expect(GATEWAY_OWNER_ONLY_CORE_TOOLS).toContain("portal");
+    expect(DEFAULT_GATEWAY_HTTP_TOOL_DENY).toContain("portal");
+  });
+
+  it("maps open, list, and close through the in-process gateway caller", async () => {
+    const recorded = recorder();
+    const tool = createPortalTool({ callGateway: recorded.callGateway });
+    const opened = await tool.execute("open", {
+      action: "open",
+      port: 3000,
+      title: "App",
+      description: "Preview",
+      path: "/app",
+    });
+    const listed = await tool.execute("list", { action: "list" });
+    const closed = await tool.execute("close", { action: "close", id: "p3000" });
+
+    expect(recorded.calls).toEqual([
+      ["portal.open", { port: 3000, title: "App", description: "Preview", path: "/app" }],
+      ["portal.list", {}],
+      ["portal.close", { id: "p3000" }],
+    ]);
+    expect(opened.details).toEqual(portal);
+    expect(opened.content[0]).toMatchObject({
+      type: "text",
+      text: expect.stringContaining("Control UI Portals page"),
+    });
+    expect(listed.details).toEqual({ portals: [portal] });
+    expect(closed.details).toEqual({ closed: true });
+    expect(Value.Check(tool.outputSchema!, opened.details)).toBe(true);
+    expect(Value.Check(tool.outputSchema!, listed.details)).toBe(true);
+    expect(Value.Check(tool.outputSchema!, closed.details)).toBe(true);
+  });
+
+  it("rejects action-specific missing and malformed fields before RPC", async () => {
+    const recorded = recorder();
+    const tool = createPortalTool({ callGateway: recorded.callGateway });
+
+    await expect(tool.execute("open", { action: "open" })).rejects.toThrow("port required");
+    await expect(tool.execute("open", { action: "open", port: 3000, path: "app" })).rejects.toThrow(
+      "path must start with /",
+    );
+    await expect(tool.execute("close", { action: "close" })).rejects.toThrow("id required");
+    expect(recorded.calls).toEqual([]);
+  });
+});
diff --git a/src/agents/tools/portal-tool.ts b/src/agents/tools/portal-tool.ts
new file mode 100644
index 000000000000..c104134108f8
--- /dev/null
+++ b/src/agents/tools/portal-tool.ts
@@ -0,0 +1,104 @@
+import { Type } from "typebox";
+import {
+  PortalCloseResultSchema,
+  PortalListResultSchema,
+  PortalSummarySchema,
+  type PortalCloseResult,
+  type PortalListResult,
+  type PortalSummary,
+} from "../../../packages/gateway-protocol/src/index.js";
+import type { AgentToolResult } from "../runtime/index.js";
+import type { AnyAgentTool } from "./common.js";
+import {
+  jsonResult,
+  readPositiveIntegerParam,
+  readToolStringParam,
+  ToolInputError,
+} from "./common.js";
+import { callInProcessGatewayTool, type InProcessGatewayCaller } from "./in-process-gateway.js";
+
+const PORTAL_ACTIONS = ["open", "list", "close"] as const;
+
+const PortalToolSchema = Type.Object(
+  {
+    action: Type.String({ enum: [...PORTAL_ACTIONS], description: "Portal action" }),
+    port: Type.Optional(Type.Integer({ minimum: 1, maximum: 65_535 })),
+    title: Type.Optional(Type.String({ minLength: 1 })),
+    description: Type.Optional(Type.String()),
+    path: Type.Optional(Type.String({ pattern: "^/" })),
+    id: Type.Optional(Type.String({ minLength: 1 })),
+  },
+  { additionalProperties: false },
+);
+
+const PortalToolOutputSchema = Type.Union([
+  PortalSummarySchema,
+  PortalListResultSchema,
+  PortalCloseResultSchema,
+]);
+
+type PortalToolOptions = {
+  callGateway?: InProcessGatewayCaller;
+};
+
+function portalResult<T>(text: string, payload: T): AgentToolResult<T> {
+  const result = jsonResult(payload);
+  return { ...result, content: [{ type: "text", text }, ...result.content] };
+}
+
+export function createPortalTool(options: PortalToolOptions = {}): AnyAgentTool {
+  const callGateway = options.callGateway ?? callInProcessGatewayTool;
+  return {
+    label: "Portal",
+    name: "portal",
+    description:
+      "Expose a local HTTP dev server through the gateway so the operator can view it live (a portal). Flow: pick a port (if the workspace has .openclaw/portals.json, use its declared entries), call action=open with that port to get the portal URL, then start the server with the exec tool (background=true) passing PORT=<port> and PUBLIC_URL=<url> in env. The proxy carries HTTP and WebSockets (hot reload works) and shows a retry page until the server listens. action=list shows active portals; action=close removes one. Portals end when the gateway restarts.",
+    parameters: PortalToolSchema,
+    outputSchema: PortalToolOutputSchema,
+    execute: async (_toolCallId, rawArgs) => {
+      const params = rawArgs as Record<string, unknown>;
+      const action = readToolStringParam(params, "action", { required: true });
+      if (action === "list") {
+        const result = await callGateway<PortalListResult>("portal.list", {});
+        return portalResult(
+          `${result.portals.length} active portal${result.portals.length === 1 ? "" : "s"}. The operator can see them in the Control UI Portals page.`,
+          result,
+        );
+      }
+      if (action === "close") {
+        const id = readToolStringParam(params, "id", { required: true });
+        const result = await callGateway<PortalCloseResult>("portal.close", { id });
+        return portalResult(
+          `Portal ${id} closed. The Control UI Portals page has been updated.`,
+          result,
+        );
+      }
+      if (action !== "open") {
+        throw new ToolInputError(`Unknown portal action: ${action}`);
+      }
+      const port = readPositiveIntegerParam(params, "port", {
+        max: 65_535,
+        message: "port must be an integer from 1 to 65535",
+      });
+      if (port === undefined) {
+        throw new ToolInputError("port required");
+      }
+      const title = readToolStringParam(params, "title");
+      const description = readToolStringParam(params, "description", { allowEmpty: true });
+      const path = readToolStringParam(params, "path");
+      if (path !== undefined && !path.startsWith("/")) {
+        throw new ToolInputError("path must start with /");
+      }
+      const portal = await callGateway<PortalSummary>("portal.open", {
+        port,
+        ...(title !== undefined ? { title } : {}),
+        ...(description !== undefined ? { description } : {}),
+        ...(path !== undefined ? { path } : {}),
+      });
+      return portalResult(
+        `Portal available at ${portal.url}. The operator can see it in the Control UI Portals page.`,
+        portal,
+      );
+    },
+  };
+}
diff --git a/src/security/dangerous-tools.ts b/src/security/dangerous-tools.ts
index 0f755fc0a3a8..d85920245c9b 100644
--- a/src/security/dangerous-tools.ts
+++ b/src/security/dangerous-tools.ts
@@ -24,6 +24,8 @@ export const DEFAULT_GATEWAY_HTTP_TOOL_DENY = [
   "apply_patch",
   // Agent-owned host terminal — interactive RCE surface
   "terminal",
+  // Local HTTP exposure can publish arbitrary workspace applications.
+  "portal",
   // Session orchestration — spawning agents remotely is RCE
   "sessions_spawn",
   // Cross-session injection — message injection across sessions
@@ -61,6 +63,7 @@ export const GATEWAY_OWNER_ONLY_CORE_TOOLS = [
   "sessions",
   "screen",
   "terminal",
+  "portal",
   "conversations_list",
   "conversations_send",
   "conversations_turn",