fix(browser): gate evaluate behind config flag

docs/gateway/configuration.md

@@ -2768,6 +2768,7 @@ scheme/host for profiles that only set `cdpPort`.
 
 Defaults:
 - enabled: `true`
+- evaluateEnabled: `true` (set `false` to disable `act:evaluate` and `wait --fn`)
 - control service: loopback only (port derived from `gateway.port`, default `18791`)
 - CDP URL: `http://127.0.0.1:18792` (control service + 1, legacy single-profile)
 - profile color: `#FF4500` (lobster-orange)
@@ -2778,6 +2779,7 @@ Defaults:
 {
   browser: {
     enabled: true,
+    evaluateEnabled: true,
     // cdpUrl: "http://127.0.0.1:18792", // legacy single-profile override
     defaultProfile: "chrome",
     profiles: {

docs/gateway/security.md

@@ -572,6 +572,9 @@ If that browser profile already contains logged-in sessions, the model can
 access those accounts and data. Treat browser profiles as **sensitive state**:
 - Prefer a dedicated profile for the agent (the default `clawd` profile).
 - Avoid pointing the agent at your personal daily-driver profile.
+- `act:evaluate` and `wait --fn` run arbitrary JavaScript in the page context.
+  Prompt injection can steer the model into calling them. If you do not need
+  them, set `browser.evaluateEnabled=false` (see [Configuration](/gateway/configuration#browser-clawd-managed-browser)).
 - Keep host browser control disabled for sandboxed agents unless you trust them.
 - Treat browser downloads as untrusted input; prefer an isolated downloads directory.
 - Disable browser sync/password managers in the agent profile if possible (reduces blast radius).

docs/tools/browser.md

@@ -505,6 +505,9 @@ These are useful for “make the site behave like X” workflows:
 ## Security & privacy
 
 - The clawd browser profile may contain logged-in sessions; treat it as sensitive.
+- `browser act kind=evaluate` / `clawdbot browser evaluate` and `wait --fn`
+  execute arbitrary JavaScript in the page context. Prompt injection can steer
+  this. Disable it with `browser.evaluateEnabled=false` if you do not need it.
 - For logins and anti-bot notes (X/Twitter, etc.), see [Browser login + X/Twitter posting](/tools/browser-login).
 - Keep the Gateway/node host private (loopback or tailnet-only).
 - Remote CDP endpoints are powerful; tunnel and protect them.

src/agents/clawdbot-gateway-tool.test.ts

@@ -20,8 +20,10 @@ describe("gateway tool", () => {
     vi.useFakeTimers();
     const kill = vi.spyOn(process, "kill").mockImplementation(() => true);
     const previousStateDir = process.env.CLAWDBOT_STATE_DIR;
+    const previousProfile = process.env.CLAWDBOT_PROFILE;
     const stateDir = await fs.mkdtemp(path.join(os.tmpdir(), "clawdbot-test-"));
     process.env.CLAWDBOT_STATE_DIR = stateDir;
+    process.env.CLAWDBOT_PROFILE = "isolated";
 
     try {
       const tool = createClawdbotTools({
@@ -62,6 +64,11 @@ describe("gateway tool", () => {
       } else {
         process.env.CLAWDBOT_STATE_DIR = previousStateDir;
       }
+      if (previousProfile === undefined) {
+        delete process.env.CLAWDBOT_PROFILE;
+      } else {
+        process.env.CLAWDBOT_PROFILE = previousProfile;
+      }
     }
   });
 

src/agents/sandbox/browser.ts

@@ -1,6 +1,9 @@
 import { startBrowserBridgeServer, stopBrowserBridgeServer } from "../../browser/bridge-server.js";
 import { type ResolvedBrowserConfig, resolveProfile } from "../../browser/config.js";
-import { DEFAULT_CLAWD_BROWSER_COLOR } from "../../browser/constants.js";
+import {
+  DEFAULT_BROWSER_EVALUATE_ENABLED,
+  DEFAULT_CLAWD_BROWSER_COLOR,
+} from "../../browser/constants.js";
 import { BROWSER_BRIDGES } from "./browser-bridges.js";
 import { DEFAULT_SANDBOX_BROWSER_IMAGE, SANDBOX_AGENT_WORKSPACE_MOUNT } from "./constants.js";
 import {
@@ -39,10 +42,12 @@ function buildSandboxBrowserResolvedConfig(params: {
   controlPort: number;
   cdpPort: number;
   headless: boolean;
+  evaluateEnabled: boolean;
 }): ResolvedBrowserConfig {
   const cdpHost = "127.0.0.1";
   return {
     enabled: true,
+    evaluateEnabled: params.evaluateEnabled,
     controlPort: params.controlPort,
     cdpProtocol: "http",
     cdpHost,
@@ -76,6 +81,7 @@ export async function ensureSandboxBrowser(params: {
   workspaceDir: string;
   agentWorkspaceDir: string;
   cfg: SandboxConfig;
+  evaluateEnabled?: boolean;
 }): Promise<SandboxBrowserContext | null> {
   if (!params.cfg.browser.enabled) return null;
   if (!isToolAllowed(params.cfg.tools, "browser")) return null;
@@ -170,6 +176,7 @@ export async function ensureSandboxBrowser(params: {
         controlPort: 0,
         cdpPort: mappedCdp,
         headless: params.cfg.browser.headless,
+        evaluateEnabled: params.evaluateEnabled ?? DEFAULT_BROWSER_EVALUATE_ENABLED,
       }),
       onEnsureAttachTarget,
     });

src/agents/sandbox/context.ts

@@ -3,6 +3,7 @@ import fs from "node:fs/promises";
 import type { ClawdbotConfig } from "../../config/config.js";
 import { defaultRuntime } from "../../runtime.js";
 import { resolveUserPath } from "../../utils.js";
+import { DEFAULT_BROWSER_EVALUATE_ENABLED } from "../../browser/constants.js";
 import { syncSkillsToWorkspace } from "../skills.js";
 import { DEFAULT_AGENT_WORKSPACE_DIR } from "../workspace.js";
 import { ensureSandboxBrowser } from "./browser.js";
@@ -69,11 +70,14 @@ export async function resolveSandboxContext(params: {
     cfg,
   });
 
+  const evaluateEnabled =
+    params.config?.browser?.evaluateEnabled ?? DEFAULT_BROWSER_EVALUATE_ENABLED;
   const browser = await ensureSandboxBrowser({
     scopeKey,
     workspaceDir,
     agentWorkspaceDir,
     cfg,
+    evaluateEnabled,
   });
 
   return {

src/agents/skills/config.ts

@@ -6,6 +6,7 @@ import type { SkillEligibilityContext, SkillEntry } from "./types.js";
 
 const DEFAULT_CONFIG_VALUES: Record<string, boolean> = {
   "browser.enabled": true,
+  "browser.evaluateEnabled": true,
 };
 
 function isTruthy(value: unknown): boolean {

src/browser/client-fetch.ts

@@ -14,7 +14,13 @@ function enhanceBrowserFetchError(url: string, err: unknown, timeoutMs: number):
     ? "If this is a sandboxed session, ensure the sandbox browser is running and try again."
     : `Start (or restart) the Clawdbot gateway (Clawdbot.app menubar, or \`${formatCliCommand("clawdbot gateway")}\`) and try again.`;
   const msg = String(err);
-  if (msg.toLowerCase().includes("timed out") || msg.toLowerCase().includes("timeout")) {
+  const msgLower = msg.toLowerCase();
+  const looksLikeTimeout =
+    msgLower.includes("timed out") ||
+    msgLower.includes("timeout") ||
+    msgLower.includes("aborted") ||
+    msgLower.includes("abort");
+  if (looksLikeTimeout) {
     return new Error(
       `Can't reach the clawd browser control service (timed out after ${timeoutMs}ms). ${hint}`,
     );
@@ -48,7 +54,7 @@ export async function fetchBrowserJson<T>(
   const timeoutMs = init?.timeoutMs ?? 5000;
   try {
     if (isAbsoluteHttp(url)) {
-      return await fetchHttpJson<T>(url, init ? { ...init, timeoutMs } : { timeoutMs });
+      return await fetchHttpJson<T>(url, { ...init, timeoutMs });
     }
     const started = await startBrowserControlServiceFromConfig();
     if (!started) {

src/browser/config.ts

@@ -8,6 +8,7 @@ import { resolveGatewayPort } from "../config/paths.js";
 import {
   DEFAULT_CLAWD_BROWSER_COLOR,
   DEFAULT_CLAWD_BROWSER_ENABLED,
+  DEFAULT_BROWSER_EVALUATE_ENABLED,
   DEFAULT_BROWSER_DEFAULT_PROFILE_NAME,
   DEFAULT_CLAWD_BROWSER_PROFILE_NAME,
 } from "./constants.js";
@@ -15,6 +16,7 @@ import { CDP_PORT_RANGE_START, getUsedPorts } from "./profiles.js";
 
 export type ResolvedBrowserConfig = {
   enabled: boolean;
+  evaluateEnabled: boolean;
   controlPort: number;
   cdpProtocol: "http" | "https";
   cdpHost: string;
@@ -140,6 +142,7 @@ export function resolveBrowserConfig(
   rootConfig?: ClawdbotConfig,
 ): ResolvedBrowserConfig {
   const enabled = cfg?.enabled ?? DEFAULT_CLAWD_BROWSER_ENABLED;
+  const evaluateEnabled = cfg?.evaluateEnabled ?? DEFAULT_BROWSER_EVALUATE_ENABLED;
   const gatewayPort = resolveGatewayPort(rootConfig);
   const controlPort = deriveDefaultBrowserControlPort(gatewayPort ?? DEFAULT_BROWSER_CONTROL_PORT);
   const defaultColor = normalizeHexColor(cfg?.color);
@@ -197,6 +200,7 @@ export function resolveBrowserConfig(
 
   return {
     enabled,
+    evaluateEnabled,
     controlPort,
     cdpProtocol,
     cdpHost: cdpInfo.parsed.hostname,

src/browser/constants.ts

@@ -1,4 +1,5 @@
 export const DEFAULT_CLAWD_BROWSER_ENABLED = true;
+export const DEFAULT_BROWSER_EVALUATE_ENABLED = true;
 export const DEFAULT_CLAWD_BROWSER_COLOR = "#FF4500";
 export const DEFAULT_CLAWD_BROWSER_PROFILE_NAME = "clawd";
 export const DEFAULT_BROWSER_DEFAULT_PROFILE_NAME = "chrome";

src/browser/routes/agent.act.ts

@@ -39,6 +39,7 @@ export function registerBrowserAgentActRoutes(
       const cdpUrl = profileCtx.profile.cdpUrl;
       const pw = await requirePwAi(res, `act:${kind}`);
       if (!pw) return;
+      const evaluateEnabled = ctx.state().resolved.evaluateEnabled;
 
       switch (kind) {
         case "click": {
@@ -210,6 +211,16 @@ export function registerBrowserAgentActRoutes(
               : undefined;
           const fn = toStringOrEmpty(body.fn) || undefined;
           const timeoutMs = toNumber(body.timeoutMs) ?? undefined;
+          if (fn && !evaluateEnabled) {
+            return jsonError(
+              res,
+              403,
+              [
+                "wait --fn is disabled by config (browser.evaluateEnabled=false).",
+                "Docs: /gateway/configuration#browser-clawd-managed-browser",
+              ].join("\n"),
+            );
+          }
           if (
             timeMs === undefined &&
             !text &&
@@ -240,6 +251,16 @@ export function registerBrowserAgentActRoutes(
           return res.json({ ok: true, targetId: tab.targetId });
         }
         case "evaluate": {
+          if (!evaluateEnabled) {
+            return jsonError(
+              res,
+              403,
+              [
+                "act:evaluate is disabled by config (browser.evaluateEnabled=false).",
+                "Docs: /gateway/configuration#browser-clawd-managed-browser",
+              ].join("\n"),
+            );
+          }
           const fn = toStringOrEmpty(body.fn);
           if (!fn) return jsonError(res, 400, "fn is required");
           const ref = toStringOrEmpty(body.ref) || undefined;

src/browser/server.agent-contract-form-layout-act-commands.test.ts

@@ -7,6 +7,7 @@ let testPort = 0;
 let cdpBaseUrl = "";
 let reachable = false;
 let cfgAttachOnly = false;
+let cfgEvaluateEnabled = true;
 let createTargetId: string | null = null;
 let prevGatewayPort: string | undefined;
 
@@ -89,6 +90,7 @@ vi.mock("../config/config.js", async (importOriginal) => {
     loadConfig: () => ({
       browser: {
         enabled: true,
+        evaluateEnabled: cfgEvaluateEnabled,
         color: "#FF4500",
         attachOnly: cfgAttachOnly,
         headless: true,
@@ -185,6 +187,7 @@ describe("browser control server", () => {
   beforeEach(async () => {
     reachable = false;
     cfgAttachOnly = false;
+    cfgEvaluateEnabled = true;
     createTargetId = null;
 
     cdpMocks.createTargetViaCdp.mockImplementation(async () => {
@@ -349,6 +352,30 @@ describe("browser control server", () => {
     slowTimeoutMs,
   );
 
+  it(
+    "blocks act:evaluate when browser.evaluateEnabled=false",
+    async () => {
+      cfgEvaluateEnabled = false;
+      const base = await startServerAndBase();
+
+      const waitRes = (await postJson(`${base}/act`, {
+        kind: "wait",
+        fn: "() => window.ready === true",
+      })) as { error?: string };
+      expect(waitRes.error).toContain("browser.evaluateEnabled=false");
+      expect(pwMocks.waitForViaPlaywright).not.toHaveBeenCalled();
+
+      const res = (await postJson(`${base}/act`, {
+        kind: "evaluate",
+        fn: "() => 1",
+      })) as { error?: string };
+
+      expect(res.error).toContain("browser.evaluateEnabled=false");
+      expect(pwMocks.evaluateViaPlaywright).not.toHaveBeenCalled();
+    },
+    slowTimeoutMs,
+  );
+
   it("agent contract: hooks + response + downloads + screenshot", async () => {
     const base = await startServerAndBase();
 

src/browser/server.covers-additional-endpoint-branches.test.ts

@@ -308,6 +308,8 @@ describe("backward compatibility (profile parameter)", () => {
 
     testPort = await getFreePort();
     _cdpBaseUrl = `http://127.0.0.1:${testPort + 1}`;
+    prevGatewayPort = process.env.CLAWDBOT_GATEWAY_PORT;
+    process.env.CLAWDBOT_GATEWAY_PORT = String(testPort - 2);
 
     vi.stubGlobal(
       "fetch",
@@ -344,6 +346,11 @@ describe("backward compatibility (profile parameter)", () => {
   afterEach(async () => {
     vi.unstubAllGlobals();
     vi.restoreAllMocks();
+    if (prevGatewayPort === undefined) {
+      delete process.env.CLAWDBOT_GATEWAY_PORT;
+    } else {
+      process.env.CLAWDBOT_GATEWAY_PORT = prevGatewayPort;
+    }
     const { stopBrowserControlServer } = await import("./server.js");
     await stopBrowserControlServer();
   });

src/browser/server.post-tabs-open-profile-unknown-returns-404.test.ts

@@ -285,6 +285,8 @@ describe("profile CRUD endpoints", () => {
 
     testPort = await getFreePort();
     _cdpBaseUrl = `http://127.0.0.1:${testPort + 1}`;
+    prevGatewayPort = process.env.CLAWDBOT_GATEWAY_PORT;
+    process.env.CLAWDBOT_GATEWAY_PORT = String(testPort - 2);
 
     vi.stubGlobal(
       "fetch",
@@ -299,6 +301,11 @@ describe("profile CRUD endpoints", () => {
   afterEach(async () => {
     vi.unstubAllGlobals();
     vi.restoreAllMocks();
+    if (prevGatewayPort === undefined) {
+      delete process.env.CLAWDBOT_GATEWAY_PORT;
+    } else {
+      process.env.CLAWDBOT_GATEWAY_PORT = prevGatewayPort;
+    }
     const { stopBrowserControlServer } = await import("./server.js");
     await stopBrowserControlServer();
   });

src/cli/browser-cli-inspect.test.ts

@@ -18,6 +18,33 @@ const configMocks = vi.hoisted(() => ({
 }));
 vi.mock("../config/config.js", () => configMocks);
 
+const sharedMocks = vi.hoisted(() => ({
+  callBrowserRequest: vi.fn(
+    async (_opts: unknown, params: { path?: string; query?: Record<string, unknown> }) => {
+      const format = params.query?.format === "aria" ? "aria" : "ai";
+      if (format === "aria") {
+        return {
+          ok: true,
+          format: "aria",
+          targetId: "t1",
+          url: "https://example.com",
+          nodes: [],
+        };
+      }
+      return {
+        ok: true,
+        format: "ai",
+        targetId: "t1",
+        url: "https://example.com",
+        snapshot: "ok",
+      };
+    },
+  ),
+}));
+vi.mock("./browser-cli-shared.js", () => ({
+  callBrowserRequest: sharedMocks.callBrowserRequest,
+}));
+
 const runtime = {
   log: vi.fn(),
   error: vi.fn(),
@@ -44,13 +71,13 @@ describe("browser cli snapshot defaults", () => {
 
     await program.parseAsync(["browser", "snapshot"], { from: "user" });
 
-    expect(clientMocks.browserSnapshot).toHaveBeenCalledWith(
+    expect(sharedMocks.callBrowserRequest).toHaveBeenCalled();
-      "http://127.0.0.1:18791",
+    const [, params] = sharedMocks.callBrowserRequest.mock.calls.at(-1) ?? [];
-      expect.objectContaining({
+    expect(params?.path).toBe("/snapshot");
-        format: "ai",
+    expect(params?.query).toMatchObject({
-        mode: "efficient",
+      format: "ai",
-      }),
+      mode: "efficient",
-    );
+    });
   });
 
   it("does not apply config snapshot defaults to aria snapshots", async () => {
@@ -71,8 +98,9 @@ describe("browser cli snapshot defaults", () => {
 
     await program.parseAsync(["browser", "snapshot", "--format", "aria"], { from: "user" });
 
-    expect(clientMocks.browserSnapshot).toHaveBeenCalled();
+    expect(sharedMocks.callBrowserRequest).toHaveBeenCalled();
-    const [, opts] = clientMocks.browserSnapshot.mock.calls.at(-1) ?? [];
+    const [, params] = sharedMocks.callBrowserRequest.mock.calls.at(-1) ?? [];
-    expect(opts?.mode).toBeUndefined();
+    expect(params?.path).toBe("/snapshot");
+    expect((params?.query as { mode?: unknown } | undefined)?.mode).toBeUndefined();
   });
 });

src/config/schema.ts

@@ -279,6 +279,7 @@ const FIELD_LABELS: Record<string, string> = {
   "ui.seamColor": "Accent Color",
   "ui.assistant.name": "Assistant Name",
   "ui.assistant.avatar": "Assistant Avatar",
+  "browser.evaluateEnabled": "Browser Evaluate Enabled",
   "browser.snapshotDefaults": "Browser Snapshot Defaults",
   "browser.snapshotDefaults.mode": "Browser Snapshot Mode",
   "browser.remoteCdpTimeoutMs": "Remote CDP Timeout (ms)",

src/config/types.browser.ts

@@ -14,6 +14,8 @@ export type BrowserSnapshotDefaults = {
 };
 export type BrowserConfig = {
   enabled?: boolean;
+  /** If false, disable browser act:evaluate (arbitrary JS). Default: true */
+  evaluateEnabled?: boolean;
   /** Base URL of the CDP endpoint (for remote browsers). Default: loopback CDP on the derived port. */
   cdpUrl?: string;
   /** Remote CDP HTTP timeout (ms). Default: 1500. */

src/config/zod-schema.ts

@@ -134,6 +134,7 @@ export const ClawdbotSchema = z
     browser: z
       .object({
         enabled: z.boolean().optional(),
+        evaluateEnabled: z.boolean().optional(),
         cdpUrl: z.string().optional(),
         remoteCdpTimeoutMs: z.number().int().nonnegative().optional(),
         remoteCdpHandshakeTimeoutMs: z.number().int().nonnegative().optional(),

src/hooks/config.ts

@@ -6,6 +6,7 @@ import type { HookEligibilityContext, HookEntry } from "./types.js";
 
 const DEFAULT_CONFIG_VALUES: Record<string, boolean> = {
   "browser.enabled": true,
+  "browser.evaluateEnabled": true,
   "workspace.dir": true,
 };
 

src/pairing/pairing-messages.test.ts

@@ -1,8 +1,23 @@
-import { describe, expect, it } from "vitest";
+import { afterEach, beforeEach, describe, expect, it } from "vitest";
 
 import { buildPairingReply } from "./pairing-messages.js";
 
 describe("buildPairingReply", () => {
+  let previousProfile: string | undefined;
+
+  beforeEach(() => {
+    previousProfile = process.env.CLAWDBOT_PROFILE;
+    process.env.CLAWDBOT_PROFILE = "isolated";
+  });
+
+  afterEach(() => {
+    if (previousProfile === undefined) {
+      delete process.env.CLAWDBOT_PROFILE;
+      return;
+    }
+    process.env.CLAWDBOT_PROFILE = previousProfile;
+  });
+
   const cases = [
     {
       channel: "discord",