feat: add page.stealth_evaluate() for undetectable JS execution (#108)

Extract CDP isolated world classes from humanize layer into standalone
stealth_eval module. Attach page.stealth_evaluate(expression) to every
page automatically — runs JS in a CDP isolated world with clean
Error.stack traces and full variable isolation from main world JS.

.github/workflows/publish.yml

@@ -85,8 +85,6 @@ jobs:
         with:
           node-version: 22
           registry-url: 'https://registry.npmjs.org'
-      - name: Upgrade npm for OIDC support
-        run: npm install -g npm@11
       - name: Build
         run: cd js && npm ci && npm run build
       - name: Publish to npm

.gitignore

@@ -67,8 +67,3 @@ debug
 publish-docker.sh
 captures
 20[0-9][0-9]-[0-9][0-9]-[0-9][0-9]-*.txt
-
-# Beads / Dolt files (added by bd init)
-.dolt/
-*.db
-.beads-credential-key

CHANGELOG.md

@@ -6,19 +6,6 @@ Changes are tagged: **[wrapper]** for Python/JS wrapper, **[binary]** for Chromi
 
 ---
 
-## [0.3.22] — 2026-04-09
-
-- **[binary]** Upgrade Linux x64 build to Chromium 146.0.7680.177.1 — 49 source-level C++ patches (up from 48), rebased from 145.0.7632.x
-
-## [0.3.21] — 2026-04-07
-
-- **[wrapper]** Remove dead `--disable-blink-features=AutomationControlled` flag -- binary patch 009 already handles `navigator.webdriver` at source level
-- **[wrapper]** Remove hardcoded GPU vendor/renderer flags -- binary auto-generates diverse, realistic GPU profiles from the fingerprint seed. Each seed gets a unique GPU instead of every user sharing the same one
-- **[wrapper]** Allow `viewport=None` to disable viewport emulation in both Python and JS wrappers (thanks [@kitiho](https://github.com/kitiho), #107)
-- **[wrapper]** Enable `geoip=True` in stealth test example to fix FingerprintJS detection
-- **[meta]** Remove npm self-upgrade step in CI -- Node 22 ships with compatible npm
-- **[docker]** Install `geoip2` in Docker image for GeoIP auto-detection support
-
 ## [0.3.20] — 2026-04-06
 
 - **[binary]** Upgrade Linux x64 build to 145.0.7632.159.9 — 48 source-level C++ patches (up from 42)

Dockerfile

@@ -20,7 +20,7 @@ WORKDIR /app
 # Python wrapper
 COPY pyproject.toml README.md LICENSE BINARY-LICENSE.md CHANGELOG.md ./
 COPY cloakbrowser/ cloakbrowser/
-RUN pip install --no-cache-dir ".[serve,geoip]"
+RUN pip install --no-cache-dir ".[serve]"
 
 # JS wrapper
 COPY js/ js/

README.md

@@ -40,7 +40,7 @@ Drop-in Playwright/Puppeteer replacement for Python and JavaScript.<br>
 Same API, same code — just swap the import. <strong>3 lines of code, 30 seconds to unblock.</strong>
 </p>
 
-- **49 source-level C++ patches** — canvas, WebGL, audio, fonts, GPU, screen, WebRTC, network timing, automation signals, CDP input behavior
+- **48 source-level C++ patches** — canvas, WebGL, audio, fonts, GPU, screen, WebRTC, network timing, automation signals, CDP input behavior
 - **`humanize=True`** — human-like mouse curves, keyboard timing, and scroll patterns. One flag, behavioral detection passes
 - **0.9 reCAPTCHA v3 score** — human-level, server-verified
 - **Passes Cloudflare Turnstile**, FingerprintJS, BrowserScan — tested against 30+ detection sites
@@ -128,10 +128,9 @@ Open [http://localhost:8080](http://localhost:8080). Create a profile. Click **L
 
 ---
 
-## Latest: v0.3.22 (Chromium 146.0.7680.177.1)
+## Latest: v0.3.20 (Chromium 145.0.7632.159.9)
 
-- **Chromium 146 upgrade** — rebased all patches from 145.0.7632.x to 146.0.7680.177
+- **48 fingerprint patches** (Linux x64) — 6 new patches covering WebRTC IP spoofing, proxy signal removal, and network timing normalization
-- **49 fingerprint patches** (Linux x64) — 1 new patch, all existing patches carried forward
 - **WebRTC IP spoofing** — `--fingerprint-webrtc-ip=auto` resolves your proxy's exit IP and spoofs WebRTC ICE candidates. Auto-injected when using `geoip=True` (no extra network call)
 - **Proxy signal removal** — DNS/connect/SSL timing zeroed, proxy cache headers stripped, Proxy-Connection header leak removed
 - **`cloakserve` CDP multiplexer** — rewritten as a multi-connection CDP proxy with per-connection fingerprint seeds
@@ -155,7 +154,7 @@ CloakBrowser doesn't solve CAPTCHAs — it prevents them from appearing. No CAPT
 
 ## Test Results
 
-All tests verified against live detection services. Last tested: Apr 2026 (Chromium 146).
+All tests verified against live detection services. Last tested: Mar 2026 (Chromium 145).
 
 | Detection Service | Stock Playwright | CloakBrowser | Notes |
 |---|---|---|---|
@@ -170,7 +169,7 @@ All tests verified against live detection services. Last tested: Apr 2026 (Chrom
 | `navigator.webdriver` | `true` | **`false`** | Source-level patch |
 | `navigator.plugins.length` | 0 | **5** | Real plugin list |
 | `window.chrome` | `undefined` | **`object`** | Present like real Chrome |
-| UA string | `HeadlessChrome` | **`Chrome/146.0.0.0`** | No headless leak |
+| UA string | `HeadlessChrome` | **`Chrome/145.0.0.0`** | No headless leak |
 | CDP detection | Detected | **Not detected** | `isAutomatedWithCDP: false` |
 | TLS fingerprint | Mismatch | **Identical to Chrome** | ja3n/ja4/akamai match |
 | | | **Tested against 30+ detection sites** | |
@@ -219,11 +218,11 @@ All tests verified against live detection services. Last tested: Apr 2026 (Chrom
 CloakBrowser is a thin wrapper (Python + JavaScript) around a custom-built Chromium binary:
 
 1. **You install** → `pip install cloakbrowser` or `npm install cloakbrowser`
-2. **First launch** → binary auto-downloads for your platform (Chromium 146)
+2. **First launch** → binary auto-downloads for your platform (Chromium 145)
 3. **Every launch** → Playwright or Puppeteer starts with our binary + stealth args
 4. **You write code** → standard Playwright/Puppeteer API, nothing new to learn
 
-The binary includes 49 source-level patches covering canvas, WebGL, audio, fonts, GPU, screen properties, WebRTC, network timing, hardware reporting, automation signal removal, and CDP input behavior mimicking.
+The binary includes 48 source-level patches covering canvas, WebGL, audio, fonts, GPU, screen properties, WebRTC, network timing, hardware reporting, automation signal removal, and CDP input behavior mimicking.
 
 These are compiled into the Chromium binary — not injected via JavaScript, not set via flags.
 
@@ -370,7 +369,7 @@ from cloakbrowser import binary_info, clear_cache, ensure_binary
 
 # Check binary installation status
 print(binary_info())
-# {'version': '146.0.7680.177.1', 'platform': 'linux-x64', 'installed': True, ...}
+# {'version': '145.0.7632.159.2', 'platform': 'linux-x64', 'installed': True, ...}
 
 # Force re-download
 clear_cache()
@@ -515,6 +514,33 @@ Access the original un-patched Playwright page at `page._original` if you need r
 
 > Contributed by [@evelaa123](https://github.com/evelaa123) — full Playwright API coverage.
 
+## Stealth Evaluate
+
+`page.stealth_evaluate(expression)` runs JavaScript in a CDP isolated world instead of Playwright's main-world `evaluate()`. This produces clean `Error.stack` traces and full variable isolation from page JS — useful when a site's anti-bot scripts inspect execution context.
+
+```python
+browser = launch()
+page = browser.new_page()
+page.goto("https://example.com")
+
+# Stealth — clean stack trace, invisible to page JS
+title = page.stealth_evaluate("document.title")
+rect = page.stealth_evaluate("document.querySelector('#btn').getBoundingClientRect().toJSON()")
+
+# Regular evaluate — unchanged, use for DOM writes
+page.evaluate("document.body.style.display = 'none'")
+```
+
+```javascript
+const browser = await launch();
+const page = await browser.newPage();
+await page.goto('https://example.com');
+
+const title = await page.stealthEvaluate('document.title');
+```
+
+Always available on every page — no flag needed. Returns JSON-serializable values only. The isolated world context auto-recreates after navigation.
+
 ## Configuration
 
 | Env Variable | Default | Description |
@@ -555,10 +581,14 @@ Every `launch()` call sets these automatically. The **wrapper** applies platform
 |------|--------------|---------------|----------|
 | `--fingerprint` | Random (10000–99999) | Random (10000–99999) | Master seed for canvas, WebGL, audio, fonts, client rects |
 | `--fingerprint-platform` | `windows` | `macos` | `navigator.platform`, User-Agent OS, GPU pool selection |
+| `--fingerprint-gpu-vendor` | `NVIDIA Corporation` | `Google Inc. (Apple)` | WebGL `UNMASKED_VENDOR_WEBGL` |
+| `--fingerprint-gpu-renderer` | `NVIDIA GeForce RTX 3070` | `ANGLE (Apple, ANGLE Metal Renderer: Apple M3, Unspecified Version)` | WebGL `UNMASKED_RENDERER_WEBGL` |
 
-The binary auto-generates everything else from the seed: GPU, hardware concurrency, device memory, and screen dimensions. Each seed produces a unique, consistent fingerprint. Override with explicit flags if needed.
+The binary auto-generates hardware concurrency (8), device memory (8), and screen dimensions (1920x1080 on Windows/Linux, 1440x900 on macOS) from the seed. Override with explicit flags if needed.
 
-> **Using the binary directly?** It works out of the box with zero flags -- the binary auto-spoofs everything. Pass `--fingerprint=seed` for a persistent identity, or use explicit flags like `--fingerprint-gpu-renderer` to override any auto-generated value.
+> **Using the binary directly?** It works out of the box with zero flags — the binary auto-spoofs everything. Pass `--fingerprint=seed` for a persistent identity, or use explicit flags like `--fingerprint-gpu-renderer` to override any auto-generated value.
+
+> **Production tip:** For better stealth at scale, pass your own GPU, screen, and hardware values instead of relying on defaults. Custom parameters make your sessions harder to cluster by anti-bot systems that look for uniform fingerprint profiles.
 
 ### Additional Flags
 
@@ -566,8 +596,6 @@ Supported by the binary but **not set by default** — pass via `args` to custom
 
 | Flag | Controls |
 |------|----------|
-| `--fingerprint-gpu-vendor` | WebGL `UNMASKED_VENDOR_WEBGL` (auto-generated from seed + platform) |
-| `--fingerprint-gpu-renderer` | WebGL `UNMASKED_RENDERER_WEBGL` (auto-generated from seed + platform) |
 | `--fingerprint-hardware-concurrency` | `navigator.hardwareConcurrency` (auto-generated: `8`) |
 | `--fingerprint-device-memory` | `navigator.deviceMemory` in GB (auto-generated: `8`) |
 | `--fingerprint-screen-width` | Screen width (auto-generated: `1920` Win/Linux, `1440` macOS) |
@@ -597,9 +625,11 @@ browser = launch(args=["--fingerprint=42069"])
 browser = launch(stealth_args=False, args=[
     "--fingerprint=42069",
     "--fingerprint-platform=windows",
+    "--fingerprint-gpu-vendor=NVIDIA Corporation",
+    "--fingerprint-gpu-renderer=NVIDIA GeForce RTX 3070",
 ])
 
-# Override GPU to look like a specific machine
+# Override GPU to look like a different machine
 browser = launch(args=[
     "--fingerprint-gpu-vendor=Intel Inc.",
     "--fingerprint-gpu-renderer=Intel Iris OpenGL Engine",
@@ -653,11 +683,11 @@ browser = await launch_async(args=["--remote-debugging-port=9242"])
 
 | Platform | Chromium | Patches | Status |
 |---|---|---|---|
-| Linux x86_64 | 146 | 49 | ✅ Latest |
+| Linux x86_64 | 145 | 42 | ✅ Latest |
-| Linux arm64 (RPi, Graviton) | 145 | 48 | ✅ |
+| Linux arm64 (RPi, Graviton) | 145 | 33 | ✅ |
 | macOS arm64 (Apple Silicon) | 145 | 26 | ✅ |
 | macOS x86_64 (Intel) | 145 | 26 | ✅ |
-| Windows x86_64 | 145 | 48 | ✅ |
+| Windows x86_64 | 145 | 33 | ✅ |
 
 The wrapper auto-downloads the correct binary for your platform.
 
@@ -918,9 +948,9 @@ export CLOAKBROWSER_BINARY_PATH=/path/to/your/chrome
 
 Install a specific wrapper version to downgrade both the wrapper and the binary it downloads:
 ```bash
-pip install cloakbrowser==0.3.21              # Python
+pip install cloakbrowser==0.3.11              # Python
-npm install cloakbrowser@0.3.21               # JavaScript
+npm install cloakbrowser@0.3.11               # JavaScript
-docker pull cloakhq/cloakbrowser:0.3.21       # Docker
+docker pull cloakhq/cloakbrowser:0.3.11       # Docker
 ```
 Each wrapper version pins its own binary version, so downgrading the wrapper automatically gets you the matching binary on next launch.
 
@@ -1016,7 +1046,7 @@ A: Yes. Pass `proxy="http://user:pass@host:port"` to `launch()`.
 
 | Feature | Status |
 |---------|--------|
-| Linux x64 — Chromium 146 (49 patches) | ✅ Released |
+| Linux x64 — Chromium 145 (48 patches) | ✅ Released |
 | macOS arm64/x64 — Chromium 145 (26 patches) | ✅ Released |
 | Windows x64 — Chromium 145 (33 patches) | ✅ Released |
 | JavaScript/Puppeteer + Playwright support | ✅ Released |
@@ -1040,7 +1070,7 @@ All releases are signed for supply chain verification.
 ```bash
 # Verify GPG signature (binary release tag)
 gpg --keyserver keyserver.ubuntu.com --recv-keys C60C0DDC9D0DE2DD
-git verify-tag chromium-v146.0.7680.177.1
+git verify-tag chromium-v145.0.7632.159.9
 
 # Verify GitHub binary attestation (Sigstore)
 gh attestation verify cloakbrowser-linux-x64.tar.gz --repo CloakHQ/cloakbrowser
@@ -1065,4 +1095,3 @@ Issues and PRs welcome. If something isn't working, [open an issue](https://gith
 
 - [@evelaa123](https://github.com/evelaa123) — humanize behavior, persistent contexts, Windows fix
 - [@yahooguntu](https://github.com/yahooguntu) — persistent contexts
-- [@kitiho](https://github.com/kitiho) — null viewport fix

cloakbrowser/_version.py

@@ -1 +1 @@
-__version__ = "0.3.22"
+__version__ = "0.3.20"

cloakbrowser/browser.py

@@ -24,9 +24,6 @@ from .download import ensure_binary
 
 logger = logging.getLogger("cloakbrowser")
 
-# Sentinel to distinguish "viewport not provided" from "viewport=None" (disable emulation)
-_VIEWPORT_UNSET = object()
-
 
 def _resolve_timezone(timezone: str | None, kwargs: dict[str, Any]) -> str | None:
     """Accept both timezone and timezone_id — either works, no warning."""
@@ -141,6 +138,10 @@ def launch(
         cfg = resolve_config(human_preset, human_config)
         patch_browser(browser, cfg)
 
+    # Stealth evaluate — always attached
+    from .stealth_eval import patch_browser_stealth_eval
+    patch_browser_stealth_eval(browser, is_async=False)
+
     return browser
 
 
@@ -230,6 +231,10 @@ async def launch_async(  # noqa: C901
         cfg = resolve_config(human_preset, human_config)
         patch_browser_async(browser, cfg)
 
+    # Stealth evaluate — always attached
+    from .stealth_eval import patch_browser_stealth_eval
+    patch_browser_stealth_eval(browser, is_async=True)
+
     return browser
 
 
@@ -240,7 +245,7 @@ def launch_persistent_context(
     args: list[str] | None = None,
     stealth_args: bool = True,
     user_agent: str | None = None,
-    viewport: dict | None = _VIEWPORT_UNSET,
+    viewport: dict | None = None,
     locale: str | None = None,
     timezone: str | None = None,
     color_scheme: Literal["light", "dark", "no-preference"] | None = None,
@@ -267,7 +272,6 @@ def launch_persistent_context(
         stealth_args: Include default stealth fingerprint args (default True).
         user_agent: Custom user agent string.
         viewport: Viewport size dict, e.g. {"width": 1920, "height": 1080}.
-            Pass None to disable viewport emulation (use OS window size).
         locale: Browser locale, e.g. "en-US".
         timezone: IANA timezone (e.g. 'America/New_York').
         color_scheme: Color scheme preference — 'light', 'dark', or 'no-preference'.
@@ -314,12 +318,7 @@ def launch_persistent_context(
     context_kwargs: dict[str, Any] = {}
     if user_agent:
         context_kwargs["user_agent"] = user_agent
-    if viewport is _VIEWPORT_UNSET:
+    context_kwargs["viewport"] = viewport or DEFAULT_VIEWPORT
-        context_kwargs["viewport"] = DEFAULT_VIEWPORT
-    elif viewport is None:
-        context_kwargs["no_viewport"] = True
-    else:
-        context_kwargs["viewport"] = viewport
     if color_scheme:
         context_kwargs["color_scheme"] = color_scheme
     context_kwargs.update(kwargs)
@@ -353,6 +352,10 @@ def launch_persistent_context(
         cfg = resolve_config(human_preset, human_config)
         patch_context(context, cfg)
 
+    # Stealth evaluate — always attached
+    from .stealth_eval import patch_context_stealth_eval
+    patch_context_stealth_eval(context, is_async=False)
+
     return context
 
 
@@ -363,7 +366,7 @@ async def launch_persistent_context_async(
     args: list[str] | None = None,
     stealth_args: bool = True,
     user_agent: str | None = None,
-    viewport: dict | None = _VIEWPORT_UNSET,
+    viewport: dict | None = None,
     locale: str | None = None,
     timezone: str | None = None,
     color_scheme: Literal["light", "dark", "no-preference"] | None = None,
@@ -389,7 +392,6 @@ async def launch_persistent_context_async(
         stealth_args: Include default stealth fingerprint args (default True).
         user_agent: Custom user agent string.
         viewport: Viewport size dict, e.g. {"width": 1920, "height": 1080}.
-            Pass None to disable viewport emulation (use OS window size).
         locale: Browser locale, e.g. "en-US".
         timezone: IANA timezone (e.g. 'America/New_York').
         color_scheme: Color scheme preference — 'light', 'dark', or 'no-preference'.
@@ -439,12 +441,7 @@ async def launch_persistent_context_async(
     context_kwargs: dict[str, Any] = {}
     if user_agent:
         context_kwargs["user_agent"] = user_agent
-    if viewport is _VIEWPORT_UNSET:
+    context_kwargs["viewport"] = viewport or DEFAULT_VIEWPORT
-        context_kwargs["viewport"] = DEFAULT_VIEWPORT
-    elif viewport is None:
-        context_kwargs["no_viewport"] = True
-    else:
-        context_kwargs["viewport"] = viewport
     if color_scheme:
         context_kwargs["color_scheme"] = color_scheme
     context_kwargs.update(kwargs)
@@ -478,6 +475,10 @@ async def launch_persistent_context_async(
         cfg = resolve_config(human_preset, human_config)
         patch_context_async(context, cfg)
 
+    # Stealth evaluate — always attached
+    from .stealth_eval import patch_context_stealth_eval
+    patch_context_stealth_eval(context, is_async=True)
+
     return context
 
 
@@ -487,7 +488,7 @@ def launch_context(
     args: list[str] | None = None,
     stealth_args: bool = True,
     user_agent: str | None = None,
-    viewport: dict | None = _VIEWPORT_UNSET,
+    viewport: dict | None = None,
     locale: str | None = None,
     timezone: str | None = None,
     color_scheme: Literal["light", "dark", "no-preference"] | None = None,
@@ -510,7 +511,6 @@ def launch_context(
         stealth_args: Include default stealth fingerprint args (default True).
         user_agent: Custom user agent string.
         viewport: Viewport size dict, e.g. {"width": 1920, "height": 1080}.
-            Pass None to disable viewport emulation (use OS window size).
         locale: Browser locale, e.g. "en-US".
         timezone: IANA timezone (e.g. 'America/New_York').
         color_scheme: Color scheme preference — 'light', 'dark', or 'no-preference'.
@@ -543,12 +543,7 @@ def launch_context(
     context_kwargs: dict[str, Any] = {}
     if user_agent:
         context_kwargs["user_agent"] = user_agent
-    if viewport is _VIEWPORT_UNSET:
+    context_kwargs["viewport"] = viewport or DEFAULT_VIEWPORT
-        context_kwargs["viewport"] = DEFAULT_VIEWPORT
-    elif viewport is None:
-        context_kwargs["no_viewport"] = True
-    else:
-        context_kwargs["viewport"] = viewport
     if color_scheme:
         context_kwargs["color_scheme"] = color_scheme
     context_kwargs.update(kwargs)
@@ -577,6 +572,10 @@ def launch_context(
         cfg = resolve_config(human_preset, human_config)
         patch_context(context, cfg)
 
+    # Stealth evaluate — always attached
+    from .stealth_eval import patch_context_stealth_eval
+    patch_context_stealth_eval(context, is_async=False)
+
     return context
 
 

cloakbrowser/config.py

@@ -15,10 +15,10 @@ from ._version import __version__
 # CHROMIUM_VERSION is the latest across all platforms (for display/reference).
 # Use get_chromium_version() for the current platform's actual version.
 # ---------------------------------------------------------------------------
-CHROMIUM_VERSION = "146.0.7680.177.1"
+CHROMIUM_VERSION = "145.0.7632.159.9"
 
 PLATFORM_CHROMIUM_VERSIONS: dict[str, str] = {
-    "linux-x64": "146.0.7680.177.1",
+    "linux-x64": "145.0.7632.159.9",
     "linux-arm64": "145.0.7632.159.7",
     "darwin-arm64": "145.0.7632.109.2",
     "darwin-x64": "145.0.7632.109.2",
@@ -48,17 +48,26 @@ def get_default_stealth_args() -> list[str]:
 
     base = [
         "--no-sandbox",
+        "--disable-blink-features=AutomationControlled",
         f"--fingerprint={seed}",
     ]
 
     if system == "Darwin":
         # Tell the fingerprint patches we're on macOS so GPU/UA match natively
-        return base + ["--fingerprint-platform=macos"]
+        return base + [
+            "--fingerprint-platform=macos",
+            "--fingerprint-gpu-vendor=Google Inc. (Apple)",
+            "--fingerprint-gpu-renderer=ANGLE (Apple, ANGLE Metal Renderer: Apple M3, Unspecified Version)",
+        ]
 
     # Linux/Windows: Windows fingerprint profile
-    # Hardware concurrency, device memory, screen, window size, and GPU are
+    # Hardware concurrency, device memory, screen, and window size are
     # auto-generated by the binary from the seed (v14+).
-    return base + ["--fingerprint-platform=windows"]
+    return base + [
+        "--fingerprint-platform=windows",
+        "--fingerprint-gpu-vendor=Google Inc. (NVIDIA)",
+        "--fingerprint-gpu-renderer=ANGLE (NVIDIA, NVIDIA GeForce RTX 3070 (0x00002484) Direct3D11 vs_5_0 ps_5_0, D3D11)",
+    ]
 
 
 # ---------------------------------------------------------------------------

cloakbrowser/human/__init__.py

@@ -26,6 +26,7 @@ from .scroll import scroll_to_element
 from .mouse_async import AsyncRawMouse, async_human_move, async_human_click, async_human_idle
 from .keyboard_async import AsyncRawKeyboard, async_human_type
 from .scroll_async import async_scroll_to_element
+from ..stealth_eval import _SyncIsolatedWorld, _AsyncIsolatedWorld
 
 _SELECT_ALL = "Meta+a" if sys.platform == "darwin" else "Control+a"
 
@@ -44,142 +45,9 @@ logger = logging.getLogger("cloakbrowser.human")
 # CDP Isolated World — stealth DOM evaluation
 # ============================================================================
 
-class _SyncIsolatedWorld:
-    """Manages a CDP isolated execution context for DOM reads (sync).
 
-    Produces clean Error.stack traces (no 'eval at evaluate :302:')
+# _SyncIsolatedWorld and _AsyncIsolatedWorld are defined in
-    and is invisible to querySelector monkey-patches in the main world.
+# cloakbrowser.stealth_eval and imported at the top of this file.
-    Context ID is invalidated on navigation and auto-recreated on next call.
-    """
-
-    __slots__ = ("_page", "_cdp", "_context_id")
-
-    def __init__(self, page: Any):
-        self._page = page
-        self._cdp: Any = None
-        self._context_id: Optional[int] = None
-
-    def _ensure_cdp(self) -> Any:
-        if self._cdp is None:
-            self._cdp = self._page.context.new_cdp_session(self._page)
-        return self._cdp
-
-    def _create_world(self) -> int:
-        cdp = self._ensure_cdp()
-        tree = cdp.send("Page.getFrameTree")
-        frame_id = tree["frameTree"]["frame"]["id"]
-        result = cdp.send("Page.createIsolatedWorld", {
-            "frameId": frame_id,
-            "worldName": "",
-            "grantUniveralAccess": True,
-        })
-        self._context_id = result["executionContextId"]
-        return self._context_id
-
-    def evaluate(self, expression: str) -> Any:
-        """Evaluate JS in isolated world. Auto-recreates on stale context."""
-        if self._context_id is None:
-            self._create_world()
-
-        for attempt in range(2):
-            try:
-                result = self._cdp.send("Runtime.evaluate", {
-                    "expression": expression,
-                    "contextId": self._context_id,
-                    "returnByValue": True,
-                })
-                if "exceptionDetails" in result:
-                    if attempt == 0:
-                        self._create_world()
-                        continue
-                    return None
-                return result.get("result", {}).get("value")
-            except Exception:
-                if attempt == 0:
-                    self._context_id = None
-                    try:
-                        self._create_world()
-                    except Exception:
-                        return None
-                    continue
-                return None
-        return None
-
-    def invalidate(self) -> None:
-        """Mark context as stale — call after navigation."""
-        self._context_id = None
-
-    def get_cdp_session(self) -> Any:
-        """Get the underlying CDP session (reused for Input.dispatchKeyEvent)."""
-        return self._ensure_cdp()
-
-
-class _AsyncIsolatedWorld:
-    """Manages a CDP isolated execution context for DOM reads (async).
-
-    Same as _SyncIsolatedWorld but uses await for all CDP calls.
-    """
-
-    __slots__ = ("_page", "_cdp", "_context_id")
-
-    def __init__(self, page: Any):
-        self._page = page
-        self._cdp: Any = None
-        self._context_id: Optional[int] = None
-
-    async def _ensure_cdp(self) -> Any:
-        if self._cdp is None:
-            self._cdp = await self._page.context.new_cdp_session(self._page)
-        return self._cdp
-
-    async def _create_world(self) -> int:
-        cdp = await self._ensure_cdp()
-        tree = await cdp.send("Page.getFrameTree")
-        frame_id = tree["frameTree"]["frame"]["id"]
-        result = await cdp.send("Page.createIsolatedWorld", {
-            "frameId": frame_id,
-            "worldName": "",
-            "grantUniveralAccess": True,
-        })
-        self._context_id = result["executionContextId"]
-        return self._context_id
-
-    async def evaluate(self, expression: str) -> Any:
-        """Evaluate JS in isolated world. Auto-recreates on stale context."""
-        if self._context_id is None:
-            await self._create_world()
-
-        for attempt in range(2):
-            try:
-                result = await self._cdp.send("Runtime.evaluate", {
-                    "expression": expression,
-                    "contextId": self._context_id,
-                    "returnByValue": True,
-                })
-                if "exceptionDetails" in result:
-                    if attempt == 0:
-                        await self._create_world()
-                        continue
-                    return None
-                return result.get("result", {}).get("value")
-            except Exception:
-                if attempt == 0:
-                    self._context_id = None
-                    try:
-                        await self._create_world()
-                    except Exception:
-                        return None
-                    continue
-                return None
-        return None
-
-    def invalidate(self) -> None:
-        """Mark context as stale — call after navigation."""
-        self._context_id = None
-
-    async def get_cdp_session(self) -> Any:
-        """Get the underlying CDP session (reused for Input.dispatchKeyEvent)."""
-        return await self._ensure_cdp()
 
 
 # ============================================================================
@@ -739,8 +607,10 @@ def patch_page(page: Any, cfg: HumanConfig, cursor: _CursorState) -> None:
     page._original = originals
     page._human_cfg = cfg
 
-    # --- Stealth infrastructure ---
+    # --- Stealth infrastructure (reuse if already attached by stealth_eval) ---
     try:
+        stealth = getattr(page, '_stealth_world', None)
+        if not isinstance(stealth, _SyncIsolatedWorld):
             stealth = _SyncIsolatedWorld(page)
             page._stealth_world = stealth
         cdp_session = stealth.get_cdp_session()
@@ -1104,7 +974,9 @@ def patch_page_async(page: Any, cfg: HumanConfig, cursor: _CursorState) -> None:
     page._original = originals
     page._human_cfg = cfg
 
-    # --- Stealth infrastructure (lazy-initialized, async) ---
+    # --- Stealth infrastructure (reuse if already attached by stealth_eval) ---
+    stealth = getattr(page, '_stealth_world', None)
+    if not isinstance(stealth, _AsyncIsolatedWorld):
         stealth = _AsyncIsolatedWorld(page)
         page._stealth_world = stealth
     cdp_session_holder: list[Any] = [None]  # mutable container for closure

cloakbrowser/stealth_eval.py

@@ -0,0 +1,271 @@
+"""Stealth evaluate — run JS in a CDP isolated world.
+
+Provides page.stealth_evaluate(expression) on every page returned by
+cloakbrowser launch functions.  Produces clean Error.stack traces (no
+``eval at evaluate :302:`` leak) and full variable isolation from main
+world JS.  Context auto-recreates after navigation.
+
+The same isolated world instances are reused by the humanize layer
+(human/__init__.py) for stealth DOM queries.
+"""
+
+from __future__ import annotations
+
+import logging
+from typing import Any, Optional
+
+logger = logging.getLogger("cloakbrowser.stealth_eval")
+
+
+# ============================================================================
+# Isolated world classes
+# ============================================================================
+
+class _SyncIsolatedWorld:
+    """CDP isolated execution context for DOM reads (sync).
+
+    Produces clean Error.stack traces and is invisible to
+    querySelector monkey-patches in the main world.
+    Context ID is invalidated on navigation and auto-recreated.
+    """
+
+    __slots__ = ("_page", "_cdp", "_context_id")
+
+    def __init__(self, page: Any):
+        self._page = page
+        self._cdp: Any = None
+        self._context_id: Optional[int] = None
+
+    def _ensure_cdp(self) -> Any:
+        if self._cdp is None:
+            self._cdp = self._page.context.new_cdp_session(self._page)
+        return self._cdp
+
+    def _create_world(self) -> int:
+        cdp = self._ensure_cdp()
+        tree = cdp.send("Page.getFrameTree")
+        frame_id = tree["frameTree"]["frame"]["id"]
+        result = cdp.send("Page.createIsolatedWorld", {
+            "frameId": frame_id,
+            "worldName": "",
+            "grantUniveralAccess": True,
+        })
+        self._context_id = result["executionContextId"]
+        return self._context_id
+
+    def evaluate(self, expression: str) -> Any:
+        """Evaluate JS in isolated world. Auto-recreates on stale context."""
+        if self._context_id is None:
+            try:
+                self._create_world()
+            except Exception:
+                logger.debug("stealth_evaluate: failed to create isolated world")
+                return None
+
+        for attempt in range(2):
+            try:
+                result = self._cdp.send("Runtime.evaluate", {
+                    "expression": expression,
+                    "contextId": self._context_id,
+                    "returnByValue": True,
+                })
+                if "exceptionDetails" in result:
+                    if attempt == 0:
+                        self._create_world()
+                        continue
+                    logger.debug("stealth_evaluate: JS exception: %s",
+                                 result["exceptionDetails"].get("text", "unknown"))
+                    return None
+                return result.get("result", {}).get("value")
+            except Exception:
+                if attempt == 0:
+                    self._context_id = None
+                    try:
+                        self._create_world()
+                    except Exception:
+                        logger.debug("stealth_evaluate: failed to recreate isolated world")
+                        return None
+                    continue
+                logger.debug("stealth_evaluate: CDP evaluate failed after retry")
+                return None
+        return None
+
+    def invalidate(self) -> None:
+        """Mark context as stale — call after navigation."""
+        self._context_id = None
+
+    def get_cdp_session(self) -> Any:
+        """Get the underlying CDP session (reused for Input.dispatchKeyEvent)."""
+        return self._ensure_cdp()
+
+
+class _AsyncIsolatedWorld:
+    """CDP isolated execution context for DOM reads (async).
+
+    Same as _SyncIsolatedWorld but uses await for all CDP calls.
+    """
+
+    __slots__ = ("_page", "_cdp", "_context_id")
+
+    def __init__(self, page: Any):
+        self._page = page
+        self._cdp: Any = None
+        self._context_id: Optional[int] = None
+
+    async def _ensure_cdp(self) -> Any:
+        if self._cdp is None:
+            self._cdp = await self._page.context.new_cdp_session(self._page)
+        return self._cdp
+
+    async def _create_world(self) -> int:
+        cdp = await self._ensure_cdp()
+        tree = await cdp.send("Page.getFrameTree")
+        frame_id = tree["frameTree"]["frame"]["id"]
+        result = await cdp.send("Page.createIsolatedWorld", {
+            "frameId": frame_id,
+            "worldName": "",
+            "grantUniveralAccess": True,
+        })
+        self._context_id = result["executionContextId"]
+        return self._context_id
+
+    async def evaluate(self, expression: str) -> Any:
+        """Evaluate JS in isolated world. Auto-recreates on stale context."""
+        if self._context_id is None:
+            try:
+                await self._create_world()
+            except Exception:
+                logger.debug("stealth_evaluate: failed to create isolated world")
+                return None
+
+        for attempt in range(2):
+            try:
+                result = await self._cdp.send("Runtime.evaluate", {
+                    "expression": expression,
+                    "contextId": self._context_id,
+                    "returnByValue": True,
+                })
+                if "exceptionDetails" in result:
+                    if attempt == 0:
+                        await self._create_world()
+                        continue
+                    logger.debug("stealth_evaluate: JS exception: %s",
+                                 result["exceptionDetails"].get("text", "unknown"))
+                    return None
+                return result.get("result", {}).get("value")
+            except Exception:
+                if attempt == 0:
+                    self._context_id = None
+                    try:
+                        await self._create_world()
+                    except Exception:
+                        logger.debug("stealth_evaluate: failed to recreate isolated world")
+                        return None
+                    continue
+                logger.debug("stealth_evaluate: CDP evaluate failed after retry")
+                return None
+        return None
+
+    def invalidate(self) -> None:
+        """Mark context as stale — call after navigation."""
+        self._context_id = None
+
+    async def get_cdp_session(self) -> Any:
+        """Get the underlying CDP session (reused for Input.dispatchKeyEvent)."""
+        return await self._ensure_cdp()
+
+
+# ============================================================================
+# Page / context / browser patching
+# ============================================================================
+
+def _patch_page_sync(page: Any) -> None:
+    """Attach page.stealth_evaluate() using a sync isolated world."""
+    if hasattr(page, "stealth_evaluate"):
+        return
+    existing = getattr(page, "_stealth_world", None)
+    if isinstance(existing, _SyncIsolatedWorld):
+        world = existing
+    else:
+        world = _SyncIsolatedWorld(page)
+        page._stealth_world = world
+    page.stealth_evaluate = world.evaluate
+
+
+def _patch_page_async(page: Any) -> None:
+    """Attach page.stealth_evaluate() using an async isolated world."""
+    if hasattr(page, "stealth_evaluate"):
+        return
+    existing = getattr(page, "_stealth_world", None)
+    if isinstance(existing, _AsyncIsolatedWorld):
+        world = existing
+    else:
+        world = _AsyncIsolatedWorld(page)
+        page._stealth_world = world
+    page.stealth_evaluate = world.evaluate
+
+
+def patch_context_stealth_eval(context: Any, *, is_async: bool = False) -> None:
+    """Patch existing pages + hook new_page() for stealth_evaluate."""
+    if getattr(context, "_stealth_eval_patched", False):
+        return
+    context._stealth_eval_patched = True
+    patch_fn = _patch_page_async if is_async else _patch_page_sync
+
+    for p in context.pages:
+        patch_fn(p)
+
+    orig_new_page = context.new_page
+
+    if is_async:
+        async def _patched_new_page(*args: Any, **kwargs: Any) -> Any:
+            page = await orig_new_page(*args, **kwargs)
+            patch_fn(page)
+            return page
+    else:
+        def _patched_new_page(*args: Any, **kwargs: Any) -> Any:
+            page = orig_new_page(*args, **kwargs)
+            patch_fn(page)
+            return page
+
+    context.new_page = _patched_new_page
+    context.on("page", lambda p: patch_fn(p))
+
+
+def patch_browser_stealth_eval(browser: Any, *, is_async: bool = False) -> None:
+    """Patch browser factory methods for stealth_evaluate."""
+    patch_fn = _patch_page_async if is_async else _patch_page_sync
+
+    # Hook new_context()
+    orig_new_context = browser.new_context
+
+    if is_async:
+        async def _patched_new_context(*args: Any, **kwargs: Any) -> Any:
+            ctx = await orig_new_context(*args, **kwargs)
+            patch_context_stealth_eval(ctx, is_async=True)
+            return ctx
+    else:
+        def _patched_new_context(*args: Any, **kwargs: Any) -> Any:
+            ctx = orig_new_context(*args, **kwargs)
+            patch_context_stealth_eval(ctx, is_async=False)
+            return ctx
+
+    browser.new_context = _patched_new_context
+
+    # Hook new_page()
+    orig_new_page = browser.new_page
+
+    if is_async:
+        async def _patched_new_page(*args: Any, **kwargs: Any) -> Any:
+            page = await orig_new_page(*args, **kwargs)
+            patch_context_stealth_eval(page.context, is_async=True)
+            patch_fn(page)
+            return page
+    else:
+        def _patched_new_page(*args: Any, **kwargs: Any) -> Any:
+            page = orig_new_page(*args, **kwargs)
+            patch_context_stealth_eval(page.context, is_async=False)
+            patch_fn(page)
+            return page
+
+    browser.new_page = _patched_new_page

js/README.md

@@ -177,6 +177,24 @@ if (newVersion) console.log(`Updated to ${newVersion}`);
 | TLS fingerprint | Mismatch | **Identical to Chrome** |
 | | | **Tested against 30+ detection sites** |
 
+## Stealth Evaluate
+
+`page.stealthEvaluate(expression)` runs JavaScript in a CDP isolated world instead of Playwright's main-world `evaluate()`. This produces clean `Error.stack` traces and full variable isolation from page JS.
+
+```typescript
+const browser = await launch();
+const page = await browser.newPage();
+await page.goto('https://example.com');
+
+// Stealth — clean stack trace, invisible to page JS
+const title = await page.stealthEvaluate('document.title');
+
+// Regular evaluate — unchanged, use for DOM writes
+await page.evaluate(() => { document.body.style.display = 'none'; });
+```
+
+Always available on every page — no flag needed. Returns JSON-serializable values only. The isolated world context auto-recreates after navigation.
+
 ## Configuration
 
 | Env Variable | Default | Description |
@@ -203,11 +221,11 @@ const page = await browser.newPage();
 
 | Platform | Chromium | Patches | Status |
 |---|---|---|---|
-| Linux x86_64 | 145 | 48 | ✅ Latest |
+| Linux x86_64 | 145 | 33 | ✅ Latest |
-| Linux arm64 (RPi, Graviton) | 145 | 48 | ✅ Latest |
+| Linux arm64 (RPi, Graviton) | 145 | 33 | ✅ Latest |
 | macOS arm64 (Apple Silicon) | 145 | 26 | ✅ Latest |
 | macOS x86_64 (Intel) | 145 | 26 | ✅ Latest |
-| Windows x86_64 | 145 | 48 | ✅ Latest |
+| Windows x86_64 | 145 | 33 | ✅ Latest |
 
 ## Requirements
 

js/package.json

@@ -1,6 +1,6 @@
 {
   "name": "cloakbrowser",
-  "version": "0.3.22",
+  "version": "0.3.20",
   "description": "Stealth Chromium that passes every bot detection test. Drop-in Playwright/Puppeteer replacement with source-level fingerprint patches.",
   "type": "module",
   "main": "dist/index.js",

js/src/config.ts

@@ -27,10 +27,10 @@ export { WRAPPER_VERSION };
 // CHROMIUM_VERSION is the latest across all platforms (for display/reference).
 // Use getChromiumVersion() for the current platform's actual version.
 // ---------------------------------------------------------------------------
-export const CHROMIUM_VERSION = "146.0.7680.177.1";
+export const CHROMIUM_VERSION = "145.0.7632.159.9";
 
 export const PLATFORM_CHROMIUM_VERSIONS: Record<string, string> = {
-  "linux-x64": "146.0.7680.177.1",
+  "linux-x64": "145.0.7632.159.9",
   "linux-arm64": "145.0.7632.159.7",
   "darwin-arm64": "145.0.7632.109.2",
   "darwin-x64": "145.0.7632.109.2",
@@ -211,16 +211,27 @@ export function getDefaultStealthArgs(): string[] {
 
   const base = [
     "--no-sandbox",
+    "--disable-blink-features=AutomationControlled",
     `--fingerprint=${seed}`,
   ];
 
   if (isMac) {
     // macOS: run as native Mac browser — GPU/UA match natively
-    return [...base, "--fingerprint-platform=macos"];
+    return [
+      ...base,
+      "--fingerprint-platform=macos",
+      "--fingerprint-gpu-vendor=Google Inc. (Apple)",
+      "--fingerprint-gpu-renderer=ANGLE (Apple, ANGLE Metal Renderer: Apple M3, Unspecified Version)",
+    ];
   }
 
   // Linux/Windows: spoof as Windows desktop
-  // Hardware concurrency, device memory, screen, window size, and GPU are
+  // Hardware concurrency, device memory, screen, and window size are
   // auto-generated by the binary from the seed (v14+).
-  return [...base, "--fingerprint-platform=windows"];
+  return [
+    ...base,
+    "--fingerprint-platform=windows",
+    "--fingerprint-gpu-vendor=Google Inc. (NVIDIA)",
+    "--fingerprint-gpu-renderer=ANGLE (NVIDIA, NVIDIA GeForce RTX 3070 (0x00002484) Direct3D11 vs_5_0 ps_5_0, D3D11)",
+  ];
 }

js/src/human/index.ts

@@ -19,6 +19,7 @@ import { HumanConfig, resolveConfig, rand, randRange, sleep } from './config.js'
 import { RawMouse, RawKeyboard, humanMove, humanClick, clickTarget, humanIdle } from './mouse.js';
 import { humanType } from './keyboard.js';
 import { scrollToElement } from './scroll.js';
+import { StealthEval } from '../stealth-eval.js';
 
 export { HumanConfig, resolveConfig } from './config.js';
 export { humanMove, humanClick, clickTarget, humanIdle } from './mouse.js';
@@ -29,102 +30,7 @@ export { scrollToElement } from './scroll.js';
 const SELECT_ALL = process.platform === 'darwin' ? 'Meta+a' : 'Control+a';
 
 
-// ============================================================================
+// StealthEval is defined in stealth-eval.ts and imported at the top of this file.
-// CDP Isolated World — stealth DOM evaluation
-// ============================================================================
-
-/**
- * Manages a CDP isolated execution context for DOM reads.
- * Produces clean Error.stack traces (no 'eval at evaluate :302:')
- * and is invisible to querySelector monkey-patches in the main world.
- *
- * Context ID is invalidated on navigation and auto-recreated on next call.
- */
-class StealthEval {
-  private cdp: CDPSession | null = null;
-  private contextId: number | null = null;
-  private page: Page;
-
-  constructor(page: Page) {
-    this.page = page;
-  }
-
-  private async ensureCdp(): Promise<CDPSession> {
-    if (!this.cdp) {
-      this.cdp = await this.page.context().newCDPSession(this.page);
-    }
-    return this.cdp;
-  }
-
-  private async createWorld(): Promise<number> {
-    const cdp = await this.ensureCdp();
-    const tree = await cdp.send('Page.getFrameTree');
-    const frameId = tree.frameTree.frame.id;
-    const result = await cdp.send('Page.createIsolatedWorld', {
-      frameId,
-      worldName: '',
-      grantUniveralAccess: true,
-    });
-    const ctxId = result.executionContextId;
-    this.contextId = ctxId;
-    return ctxId;
-  }
-
-  /**
-   * Evaluate a JS expression in the isolated world.
-   * Auto-recreates the world if the context was invalidated (navigation).
-   * Returns the result value, or undefined on failure.
-   */
-  async evaluate(expression: string): Promise<any> {
-    if (this.contextId === null) {
-      await this.createWorld();
-    }
-
-    for (let attempt = 0; attempt < 2; attempt++) {
-      try {
-        const cdp = await this.ensureCdp();
-        const result = await cdp.send('Runtime.evaluate', {
-          expression,
-          contextId: this.contextId!,
-          returnByValue: true,
-        });
-
-        if (result.exceptionDetails) {
-          // Context was likely invalidated by navigation
-          if (attempt === 0) {
-            await this.createWorld();
-            continue;
-          }
-          return undefined;
-        }
-
-        return result.result?.value;
-      } catch {
-        if (attempt === 0) {
-          this.contextId = null;
-          try {
-            await this.createWorld();
-          } catch {
-            return undefined;
-          }
-          continue;
-        }
-        return undefined;
-      }
-    }
-    return undefined;
-  }
-
-  /** Mark context as stale — call after navigation. */
-  invalidate(): void {
-    this.contextId = null;
-  }
-
-  /** Get the underlying CDP session (reused for Input.dispatchKeyEvent etc.). */
-  async getCdpSession(): Promise<CDPSession> {
-    return this.ensureCdp();
-  }
-}
 
 
 // ============================================================================
@@ -163,7 +69,8 @@ async function isInputElement(
             || el.getAttribute('contenteditable') === 'true';
         })()
       `);
-      return !!result;
+      if (result !== undefined && result !== null) return !!result;
+      // undefined/null = CDP failed, fall through to page.evaluate
     } catch {
       // Fall through to page.evaluate
     }
@@ -197,7 +104,8 @@ async function isSelectorFocused(
           return el === document.activeElement;
         })()
       `);
-      return !!result;
+      if (result !== undefined && result !== null) return !!result;
+      // undefined/null = CDP failed, fall through to page.evaluate
     } catch {
       // Fall through to page.evaluate
     }
@@ -246,9 +154,9 @@ function patchPage(page: Page, cfg: HumanConfig, cursor: CursorState): void {
   (page as any)._original = originals;
   (page as any)._humanCfg = cfg;
 
-  // --- Stealth infrastructure ---
+  // --- Stealth infrastructure (reuse if already attached by stealth-eval) ---
-  const stealth = new StealthEval(page);
+  const stealth = (page as any)._stealthWorld ?? new StealthEval(page);
-  (page as any)._stealth = stealth;
+  (page as any)._stealthWorld = stealth;
 
   // CDP session for shift symbol typing (lazy-initialized, reuses stealth's session)
   let cdpSession: CDPSession | null = null;

js/src/playwright.ts

@@ -67,6 +67,10 @@ export async function launch(options: LaunchOptions = {}): Promise<Browser> {
     patchBrowser(browser, cfg);
   }
 
+  // Stealth evaluate — always attached
+  const { patchBrowser: patchStealthEval } = await import('./stealth-eval.js');
+  patchStealthEval(browser);
+
   return browser;
 }
 
@@ -106,7 +110,7 @@ export async function launchContext(
   try {
     context = await browser.newContext({
       ...(options.userAgent ? { userAgent: options.userAgent } : {}),
-      viewport: options.viewport === undefined ? DEFAULT_VIEWPORT : options.viewport,
+      viewport: options.viewport ?? DEFAULT_VIEWPORT,
       ...(options.colorScheme ? { colorScheme: options.colorScheme } : {}),
     });
   } catch (err) {
@@ -132,6 +136,10 @@ export async function launchContext(
     patchContext(context, cfg);
   }
 
+  // Stealth evaluate — always attached
+  const { patchContext: patchStealthEvalCtx } = await import('./stealth-eval.js');
+  patchStealthEvalCtx(context);
+
   return context;
 }
 
@@ -181,7 +189,7 @@ export async function launchPersistentContext(
       ? { proxy: typeof options.proxy === "string" ? parseProxyUrl(options.proxy) : options.proxy }
       : {}),
     ...(options.userAgent ? { userAgent: options.userAgent } : {}),
-    viewport: options.viewport === undefined ? DEFAULT_VIEWPORT : options.viewport,
+    viewport: options.viewport ?? DEFAULT_VIEWPORT,
     ...(options.colorScheme ? { colorScheme: options.colorScheme } : {}),
     ...options.launchOptions,
   });
@@ -197,6 +205,10 @@ export async function launchPersistentContext(
     patchContext(context, cfg);
   }
 
+  // Stealth evaluate — always attached
+  const { patchContext: patchStealthEvalCtx2 } = await import('./stealth-eval.js');
+  patchStealthEvalCtx2(context);
+
   return context;
 }
 

js/src/stealth-eval.ts

@@ -0,0 +1,161 @@
+/**
+ * Stealth evaluate — run JS in a CDP isolated world.
+ *
+ * Provides page.stealthEvaluate(expression) on every page returned by
+ * cloakbrowser launch functions.  Produces clean Error.stack traces (no
+ * `eval at evaluate :302:` leak) and full variable isolation from main
+ * world JS.  Context auto-recreates after navigation.
+ *
+ * The same StealthEval instances are reused by the humanize layer
+ * (human/index.ts) for stealth DOM queries.
+ */
+
+import type { Browser, BrowserContext, Page, CDPSession } from 'playwright-core';
+
+
+// ============================================================================
+// Isolated world class
+// ============================================================================
+
+/**
+ * Manages a CDP isolated execution context for DOM reads.
+ * Produces clean Error.stack traces (no 'eval at evaluate :302:')
+ * and is invisible to querySelector monkey-patches in the main world.
+ *
+ * Context ID is invalidated on navigation and auto-recreated on next call.
+ */
+export class StealthEval {
+  private cdp: CDPSession | null = null;
+  private contextId: number | null = null;
+  private page: Page;
+
+  constructor(page: Page) {
+    this.page = page;
+  }
+
+  private async ensureCdp(): Promise<CDPSession> {
+    if (!this.cdp) {
+      this.cdp = await this.page.context().newCDPSession(this.page);
+    }
+    return this.cdp;
+  }
+
+  private async createWorld(): Promise<number> {
+    const cdp = await this.ensureCdp();
+    const tree = await cdp.send('Page.getFrameTree');
+    const frameId = tree.frameTree.frame.id;
+    const result = await cdp.send('Page.createIsolatedWorld', {
+      frameId,
+      worldName: '',
+      grantUniveralAccess: true,
+    });
+    const ctxId = result.executionContextId;
+    this.contextId = ctxId;
+    return ctxId;
+  }
+
+  /**
+   * Evaluate a JS expression in the isolated world.
+   * Auto-recreates the world if the context was invalidated (navigation).
+   * Returns the result value, or undefined on failure.
+   */
+  async evaluate(expression: string): Promise<any> {
+    if (this.contextId === null) {
+      try {
+        await this.createWorld();
+      } catch {
+        return undefined;
+      }
+    }
+
+    for (let attempt = 0; attempt < 2; attempt++) {
+      try {
+        const cdp = await this.ensureCdp();
+        const result = await cdp.send('Runtime.evaluate', {
+          expression,
+          contextId: this.contextId!,
+          returnByValue: true,
+        });
+
+        if (result.exceptionDetails) {
+          if (attempt === 0) {
+            await this.createWorld();
+            continue;
+          }
+          return undefined;
+        }
+
+        return result.result?.value;
+      } catch {
+        if (attempt === 0) {
+          this.contextId = null;
+          try {
+            await this.createWorld();
+          } catch {
+            return undefined;
+          }
+          continue;
+        }
+        return undefined;
+      }
+    }
+    return undefined;
+  }
+
+  /** Mark context as stale — call after navigation. */
+  invalidate(): void {
+    this.contextId = null;
+  }
+
+  /** Get the underlying CDP session (reused for Input.dispatchKeyEvent etc.). */
+  async getCdpSession(): Promise<CDPSession> {
+    return this.ensureCdp();
+  }
+}
+
+
+// ============================================================================
+// Page / context / browser patching
+// ============================================================================
+
+function patchPage(page: Page): void {
+  if ((page as any).stealthEvaluate) return;
+  const existing = (page as any)._stealthWorld;
+  const stealth = existing instanceof StealthEval ? existing : new StealthEval(page);
+  (page as any)._stealthWorld = stealth;
+  (page as any).stealthEvaluate = stealth.evaluate.bind(stealth);
+}
+
+export function patchContext(context: BrowserContext): void {
+  if ((context as any)._stealthEvalPatched) return;
+  (context as any)._stealthEvalPatched = true;
+  for (const p of context.pages()) {
+    patchPage(p);
+  }
+
+  const origNewPage = context.newPage.bind(context);
+  context.newPage = async (...args: Parameters<BrowserContext['newPage']>) => {
+    const page = await origNewPage(...args);
+    patchPage(page);
+    return page;
+  };
+
+  context.on('page', (page: Page) => patchPage(page));
+}
+
+export function patchBrowser(browser: Browser): void {
+  const origNewContext = browser.newContext.bind(browser);
+  browser.newContext = async (...args: Parameters<Browser['newContext']>) => {
+    const ctx = await origNewContext(...args);
+    patchContext(ctx);
+    return ctx;
+  };
+
+  const origNewPage = browser.newPage.bind(browser);
+  browser.newPage = async (...args: Parameters<Browser['newPage']>) => {
+    const page = await origNewPage(...args);
+    patchContext(page.context());
+    patchPage(page);
+    return page;
+  };
+}

js/src/types.ts

@@ -2,6 +2,13 @@
  * Shared types for cloakbrowser launch wrappers.
  */
 
+declare module 'playwright-core' {
+  interface Page {
+    /** Evaluate JS in a CDP isolated world — clean stack traces, invisible to main-world monkey-patches. */
+    stealthEvaluate(expression: string): Promise<any>;
+  }
+}
+
 export interface LaunchOptions {
   /** Run in headless mode (default: true). */
   headless?: boolean;
@@ -36,7 +43,7 @@ export interface LaunchContextOptions extends LaunchOptions {
   /** Custom user agent string. */
   userAgent?: string;
   /** Viewport size. */
-  viewport?: { width: number; height: number } | null;
+  viewport?: { width: number; height: number };
   /** Browser locale, e.g. "en-US". */
   locale?: string;
   /** IANA timezone — alias for `timezone`. Either works. */

js/tests/config.test.ts

@@ -21,17 +21,16 @@ describe("config", () => {
     const isMac = process.platform === "darwin";
 
     expect(args).toContain("--no-sandbox");
+    expect(args).toContain("--disable-blink-features=AutomationControlled");
 
     if (isMac) {
       expect(args).toContain("--fingerprint-platform=macos");
+      // macOS: no hardware-concurrency or GPU spoofing (uses native values)
+      expect(args.some((a) => a.includes("hardware-concurrency"))).toBe(false);
     } else {
       expect(args).toContain("--fingerprint-platform=windows");
     }
 
-    // GPU flags removed — binary auto-generates from seed + platform
-    expect(args.some((a) => a.includes("fingerprint-gpu-vendor"))).toBe(false);
-    expect(args.some((a) => a.includes("fingerprint-gpu-renderer"))).toBe(false);
-
     // Should have a random fingerprint seed
     const fingerprintArg = args.find((a) => a.startsWith("--fingerprint="));
     expect(fingerprintArg).toBeDefined();

js/tests/launch.test.ts

@@ -46,14 +46,17 @@ describe("launchContext (unit)", () => {
   let mockContext: any;
   let mockBrowser: any;
   let mockChromium: any;
+  let origNewContext: any;
   const origEnv = process.env.CLOAKBROWSER_BINARY_PATH;
 
   beforeEach(() => {
     process.env.CLOAKBROWSER_BINARY_PATH = "/fake/chrome";
     const origClose = vi.fn();
-    mockContext = { close: origClose, _origClose: origClose };
+    mockContext = { close: origClose, _origClose: origClose, newPage: vi.fn(), on: vi.fn(), pages: vi.fn().mockReturnValue([]) };
+    origNewContext = vi.fn().mockResolvedValue(mockContext);
     mockBrowser = {
-      newContext: vi.fn().mockResolvedValue(mockContext),
+      newContext: origNewContext,
+      newPage: vi.fn(),
       close: vi.fn(),
     };
     mockChromium = { launch: vi.fn().mockResolvedValue(mockBrowser) };
@@ -75,7 +78,7 @@ describe("launchContext (unit)", () => {
     const { launchContext } = await import("../src/playwright.js");
     await launchContext();
 
-    const ctxArgs = mockBrowser.newContext.mock.calls[0][0];
+    const ctxArgs = origNewContext.mock.calls[0][0];
     expect(ctxArgs.viewport).toEqual(DEFAULT_VIEWPORT);
   });
 
@@ -84,7 +87,7 @@ describe("launchContext (unit)", () => {
     const custom = { width: 1280, height: 720 };
     await launchContext({ viewport: custom });
 
-    const ctxArgs = mockBrowser.newContext.mock.calls[0][0];
+    const ctxArgs = origNewContext.mock.calls[0][0];
     expect(ctxArgs.viewport).toEqual(custom);
   });
 
@@ -92,7 +95,7 @@ describe("launchContext (unit)", () => {
     const { launchContext } = await import("../src/playwright.js");
     await launchContext({ userAgent: "Custom/1.0" });
 
-    const ctxArgs = mockBrowser.newContext.mock.calls[0][0];
+    const ctxArgs = origNewContext.mock.calls[0][0];
     expect(ctxArgs.userAgent).toBe("Custom/1.0");
   });
 
@@ -108,7 +111,7 @@ describe("launchContext (unit)", () => {
     expect(hasTimezoneFlag).toBe(true);
 
     // NOT in newContext() — no CDP emulation
-    const ctxArgs = mockBrowser.newContext.mock.calls[0][0];
+    const ctxArgs = origNewContext.mock.calls[0][0];
     expect(ctxArgs.timezoneId).toBeUndefined();
   });
 
@@ -116,7 +119,7 @@ describe("launchContext (unit)", () => {
     const { launchContext } = await import("../src/playwright.js");
     await launchContext({ colorScheme: "dark" });
 
-    const ctxArgs = mockBrowser.newContext.mock.calls[0][0];
+    const ctxArgs = origNewContext.mock.calls[0][0];
     expect(ctxArgs.colorScheme).toBe("dark");
   });
 
@@ -132,6 +135,84 @@ describe("launchContext (unit)", () => {
   });
 });
 
+// ---------------------------------------------------------------------------
+// stealth_evaluate patching unit tests
+// ---------------------------------------------------------------------------
+
+describe("stealthEvaluate patching (unit)", () => {
+  const origEnv = process.env.CLOAKBROWSER_BINARY_PATH;
+  let mockPage: any;
+  let mockContext: any;
+  let mockBrowser: any;
+
+  beforeEach(() => {
+    process.env.CLOAKBROWSER_BINARY_PATH = "/fake/chrome";
+
+    // Page mock with context() returning the implicit context
+    mockPage = {
+      context: vi.fn(),
+    };
+    // Implicit context created by browser.newPage()
+    mockContext = {
+      pages: vi.fn().mockReturnValue([]),
+      newPage: vi.fn(),
+      on: vi.fn(),
+    };
+    mockPage.context.mockReturnValue(mockContext);
+
+    mockBrowser = {
+      newContext: vi.fn().mockResolvedValue(mockContext),
+      newPage: vi.fn().mockResolvedValue(mockPage),
+      close: vi.fn(),
+    };
+    const mockChromium = { launch: vi.fn().mockResolvedValue(mockBrowser) };
+    vi.doMock("playwright-core", () => ({ chromium: mockChromium }));
+  });
+
+  afterEach(() => {
+    vi.restoreAllMocks();
+    vi.resetModules();
+    if (origEnv) {
+      process.env.CLOAKBROWSER_BINARY_PATH = origEnv;
+    } else {
+      delete process.env.CLOAKBROWSER_BINARY_PATH;
+    }
+  });
+
+  it("page.stealthEvaluate exists after launch + browser.newPage", async () => {
+    const { launch } = await import("../src/playwright.js");
+    const browser = await launch({ headless: true });
+    const page = await browser.newPage();
+
+    expect(typeof (page as any).stealthEvaluate).toBe("function");
+  });
+
+  it("implicit context from browser.newPage is patched for future pages", async () => {
+    const { launch } = await import("../src/playwright.js");
+    const browser = await launch({ headless: true });
+    await browser.newPage();
+
+    // The 'page' event listener should be registered on the implicit context
+    expect(mockContext.on).toHaveBeenCalledWith("page", expect.any(Function));
+    // The context should be marked as patched
+    expect((mockContext as any)._stealthEvalPatched).toBe(true);
+  });
+
+  it("context from browser.newContext patches pages with stealthEvaluate", async () => {
+    const { launch } = await import("../src/playwright.js");
+    const browser = await launch({ headless: true });
+
+    const mockPage2: any = { context: vi.fn().mockReturnValue(mockContext) };
+    mockContext.newPage.mockResolvedValue(mockPage2);
+    mockContext.pages.mockReturnValue([]);
+
+    const ctx = await browser.newContext();
+    const page = await ctx.newPage();
+
+    expect(typeof (page as any).stealthEvaluate).toBe("function");
+  });
+});
+
 describe("launchPersistentContext (unit)", () => {
   let mockContext: any;
   let mockChromium: any;
@@ -139,7 +220,7 @@ describe("launchPersistentContext (unit)", () => {
 
   beforeEach(() => {
     process.env.CLOAKBROWSER_BINARY_PATH = "/fake/chrome";
-    mockContext = { close: vi.fn(), pages: vi.fn().mockReturnValue([]) };
+    mockContext = { close: vi.fn(), pages: vi.fn().mockReturnValue([]), newPage: vi.fn(), on: vi.fn() };
     mockChromium = {
       launchPersistentContext: vi.fn().mockResolvedValue(mockContext),
     };

js/tests/stealth.test.ts

@@ -470,7 +470,7 @@ describe("humanType mixed text with CDP", () => {
 // patchPage stealth wiring
 // =========================================================================
 describe("patchPage stealth infrastructure", () => {
-  it("page._stealth is a StealthEval instance after patching", async () => {
+  it("page._stealthWorld is a StealthEval instance after patching", async () => {
     const { patchPage } = await import("../src/human/index.js");
 
     const page = buildMockPage();
@@ -478,10 +478,10 @@ describe("patchPage stealth infrastructure", () => {
     const cursor = { x: 0, y: 0, initialized: false };
     patchPage(page as any, cfg, cursor as any);
 
-    expect((page as any)._stealth).toBeDefined();
+    expect((page as any)._stealthWorld).toBeDefined();
-    expect(typeof (page as any)._stealth.evaluate).toBe("function");
+    expect(typeof (page as any)._stealthWorld.evaluate).toBe("function");
-    expect(typeof (page as any)._stealth.invalidate).toBe("function");
+    expect(typeof (page as any)._stealthWorld.invalidate).toBe("function");
-    expect(typeof (page as any)._stealth.getCdpSession).toBe("function");
+    expect(typeof (page as any)._stealthWorld.getCdpSession).toBe("function");
   });
 
   it("page._original and page._humanCfg are set", async () => {
@@ -504,7 +504,7 @@ describe("patchPage stealth infrastructure", () => {
     const cursor = { x: 0, y: 0, initialized: false };
     patchPage(page as any, cfg, cursor as any);
 
-    const stealth = (page as any)._stealth;
+    const stealth = (page as any)._stealthWorld;
     const invalidateSpy = vi.spyOn(stealth, "invalidate");
 
     await page.goto("https://example.com");
@@ -540,7 +540,7 @@ describe("StealthEval lifecycle", () => {
     const cursor = { x: 0, y: 0, initialized: false };
     patchPage(page as any, cfg, cursor as any);
 
-    const stealth = (page as any)._stealth;
+    const stealth = (page as any)._stealthWorld;
     expect(() => stealth.invalidate()).not.toThrow();
   });
 
@@ -552,7 +552,7 @@ describe("StealthEval lifecycle", () => {
     const cursor = { x: 0, y: 0, initialized: false };
     patchPage(page as any, cfg, cursor as any);
 
-    const stealth = (page as any)._stealth;
+    const stealth = (page as any)._stealthWorld;
     const session = await stealth.getCdpSession();
     expect(session).toBeDefined();
     expect(typeof session.send).toBe("function");
@@ -587,7 +587,7 @@ describe("StealthEval lifecycle", () => {
     const cursor = { x: 0, y: 0, initialized: false };
     patchPage(page as any, cfg, cursor as any);
 
-    const stealth = (page as any)._stealth;
+    const stealth = (page as any)._stealthWorld;
     const result = await stealth.evaluate("1 + 1");
     expect(result).toBe(true);
   });
@@ -626,7 +626,7 @@ describe("StealthEval lifecycle", () => {
     const cursor = { x: 0, y: 0, initialized: false };
     patchPage(page as any, cfg, cursor as any);
 
-    const stealth = (page as any)._stealth;
+    const stealth = (page as any)._stealthWorld;
     const result = await stealth.evaluate("test");
     expect(result).toBe("recovered");
   });
@@ -660,7 +660,7 @@ describe("StealthEval lifecycle", () => {
     const cursor = { x: 0, y: 0, initialized: false };
     patchPage(page as any, cfg, cursor as any);
 
-    const stealth = (page as any)._stealth;
+    const stealth = (page as any)._stealthWorld;
     const result = await stealth.evaluate("broken");
     expect(result).toBeUndefined();
   });
@@ -975,7 +975,7 @@ describeIfSlow("stealth browser: navigation invalidation", () => {
     const browser = await launch({ headless: true, args: ['--humanize'] });
     const page = await browser.newPage();
 
-    expect((page as any)._stealth).toBeDefined();
+    expect((page as any)._stealthWorld).toBeDefined();
 
     await page.goto('https://www.wikipedia.org', { waitUntil: 'domcontentloaded' });
     await sleep(1000);

tests/test_config.py

@@ -133,14 +133,10 @@ class TestStealthArgs:
         with patch("cloakbrowser.config.platform.system", return_value="Darwin"):
             args = get_default_stealth_args()
             assert "--fingerprint-platform=macos" in args
-            # GPU flags removed — binary auto-generates from seed + platform
+            assert any("Apple" in a for a in args)
-            assert not any("fingerprint-gpu-vendor" in a for a in args)
-            assert not any("fingerprint-gpu-renderer" in a for a in args)
 
     def test_linux_windows_profile(self):
         with patch("cloakbrowser.config.platform.system", return_value="Linux"):
             args = get_default_stealth_args()
             assert "--fingerprint-platform=windows" in args
-            # GPU flags removed — binary auto-generates from seed + platform
+            assert any("NVIDIA" in a for a in args)
-            assert not any("fingerprint-gpu-vendor" in a for a in args)
-            assert not any("fingerprint-gpu-renderer" in a for a in args)