chore(release): 0.27.0-fork.29 — plugin overflowTest fix, popup-free auto-connect, ab-connect rebrand+icon, README

- stealth(plugins): stop overwriting real native navigator.plugins in headed
  mode (the JS fake had a non-native item(), broken uint32 wrap → incolumitas
  overflowTest FAIL, and an anachronistic Native Client plugin). Leave native
  plugins untouched when present; modernize the headless-escape fallback to the
  real 5 PDF-viewer set with masked-native item()/namedItem().
- connect: auto_connect_cdp() now prefers the dialog-free ab-connect relay over
  the raw :9222 CDP port, so Chrome 136+'s "Allow remote debugging?" consent
  modal no longer fires when the extension relay is live. Gated by a bare-TCP
  relay_is_live() probe (+3 unit tests).
- extension: rename ab-connect to "agent-browser-stealth" + new stealth icon set
  (16/32/48/128).
- docs(README): hero/shield/fingerprint images, expanded detector results
  (CreepJS 0% stealth, incolumitas all-OK, BrowserScan CDP-clean), and a
  "Verify it yourself" section. .gitignore: allow assets/ + extension icons.

.gitignore

@@ -38,6 +38,10 @@ __pycache__/
 *.webm
 test/e2e/.dogfood-output/
 
+# ...but these are real repo assets, not test artifacts — keep them tracked
+!assets/*.png
+!extensions/ab-connect/icons/*.png
+
 # Package manager
 package-lock.json
 yarn.lock

README.md

@@ -1,11 +1,15 @@
 # agent-browser-stealth
 
+![agent-browser-stealth](assets/hero.png)
+
 Stealth fork of [agent-browser](https://github.com/vercel-labs/agent-browser) — connects to your real Chrome, shares your login sessions, and is undetectable by anti-bot systems.
 
 For basic usage, commands, and API reference, see the [upstream documentation](https://github.com/vercel-labs/agent-browser).
 
 ## Why this fork?
 
+<img src="assets/fingerprint.png" alt="real but undetectable fingerprint" width="300" align="right" />
+
 **agent-browser** launches a fresh browser with an empty profile. You need to log in again, and websites can detect it's automated.
 
 **agent-browser-stealth** connects to your existing Chrome. Your cookies, sessions, and browser fingerprint are all real — because it IS your real browser.
@@ -115,6 +119,8 @@ In CI environments, standalone mode is used automatically.
 
 ## Anti-detection
 
+<img src="assets/shield.png" alt="stealth shield" width="320" align="right" />
+
 When connected to your real Chrome, we inject **zero** JavaScript patches. Your browser's fingerprint is completely genuine. The guiding rule is **native CDP/Chrome overrides over JS lies** — a re-defined getter is itself detectable; a native override isn't.
 
 - `navigator.webdriver = false` via `Emulation.setAutomationOverride` (native, undetectable by CreepJS-style lie tests).
@@ -124,11 +130,27 @@ When connected to your real Chrome, we inject **zero** JavaScript patches. Your
 
 | Test site | Result |
 |---|---|
-| [CreepJS](https://abrahamjuliot.github.io/creepjs/) | 0% stealth, 0% headless |
+| [CreepJS](https://abrahamjuliot.github.io/creepjs/) | **0% stealth · 0% headless** (no override traces at all) |
-| [bot.sannysoft.com](https://bot.sannysoft.com) | All green |
+| [bot.incolumitas.com](https://bot.incolumitas.com/) | all checks OK — `overflowTest`, `overrideTest`, `puppeteerExtraStealthUsed`, worker consistency |
-| [Cloudflare Turnstile](https://nowsecure.nl) | Passed |
+| [bot.sannysoft.com](https://bot.sannysoft.com) | all green |
+| [BrowserScan](https://www.browserscan.net/bot-detection) | Webdriver · User-Agent · CDP all clean |
+| [Cloudflare Turnstile](https://nowsecure.nl) | passed |
 
-When using `--launch` mode (standalone browser), a full suite of 32 stealth patches is applied for headless Chrome.
+`0% stealth` on CreepJS is the key number: because the connect path patches **nothing**, there is no override for a lie-detector to catch. (Dashboards that read `navigator.languages` order or IP geolocation may show a soft "navigator"/"location" flag — that tracks *your real Chrome's* language list and network, not an automation tell.)
+
+When using `--launch` mode (standalone browser), a full suite of stealth patches is applied instead, and it still passes the suite above.
+
+### Verify it yourself
+
+Don't take our word for it — point your connected Chrome at the toughest public detectors and compare:
+
+- **[CreepJS](https://abrahamjuliot.github.io/creepjs/)** — the most thorough fingerprint / lie detector
+- **[bot.incolumitas.com](https://bot.incolumitas.com/)** — behavioral + fingerprint scoring with a public methodology
+- **[BrowserScan](https://www.browserscan.net/bot-detection)** — Webdriver / User-Agent / CDP / Navigator
+- **[bot.sannysoft.com](https://bot.sannysoft.com)** — the classic automation-marker checklist
+- **[pixelscan.net](https://pixelscan.net/)** · **[iphey.com](https://iphey.com/)** — consistency & identity
+
+We deliberately **don't ship our own bot detector** — the strongest, most honest benchmark is the market's best detectors run against your real browser.
 
 ### Tuning knobs (environment variables)
 

cli/Cargo.lock

@@ -45,7 +45,7 @@ dependencies = [
 
 [[package]]
 name = "agent-browser-stealth"
-version = "0.27.0-fork.25"
+version = "0.27.0-fork.29"
 dependencies = [
  "aes-gcm",
  "async-trait",

cli/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "agent-browser-stealth"
-version = "0.27.0-fork.25"
+version = "0.27.0-fork.29"
 edition = "2021"
 description = "Fast browser automation CLI for AI agents"
 license = "Apache-2.0"

cli/src/native/cdp/chrome.rs

@@ -146,6 +146,16 @@ struct ChromeArgs {
     temp_user_data_dir: Option<PathBuf>,
 }
 
+/// Whether to launch Chrome headless. The stealth fork FORBIDS headless (it's a
+/// bot-detection tell), so this is `false` unless an operator explicitly opts in
+/// via `AGENT_BROWSER_ALLOW_HEADLESS=1` for a display-less server. The `headless`
+/// LaunchOption is intentionally ignored — headed is non-negotiable for stealth.
+fn launch_headless() -> bool {
+    std::env::var("AGENT_BROWSER_ALLOW_HEADLESS")
+        .map(|v| v == "1" || v.eq_ignore_ascii_case("true"))
+        .unwrap_or(false)
+}
+
 /// Decide the `--force-webrtc-ip-handling-policy` value, if any, for a launched
 /// Chrome. Returns `None` to leave WebRTC at Chrome's default behavior.
 fn webrtc_ip_handling_policy(has_proxy: bool) -> Option<&'static str> {
@@ -202,9 +212,13 @@ fn build_chrome_args(options: &LaunchOptions) -> Result<ChromeArgs, String> {
         .as_ref()
         .is_some_and(|exts| !exts.is_empty());
 
-    // Extensions require headed mode in native Chrome (content scripts are not
+    // Stealth fork: NEVER launch headless. Headless Chrome is a detectable tell
-    // injected in headless mode).  Skip --headless when extensions are loaded.
+    // (creepjs scores ~33% headless even with new-headless; a real GPU and a
-    if options.headless && !has_extensions {
+    // headed window score 0%). So we always launch headed and ignore the
+    // `headless` option. The only escape is an explicit AGENT_BROWSER_ALLOW_HEADLESS=1
+    // for genuinely display-less servers (discouraged — it forfeits stealth).
+    // Extensions also require headed mode (content scripts aren't injected headless).
+    if launch_headless() && !has_extensions {
         args.push("--headless=new".to_string());
         // Linux paints native scrollbars into viewport screenshots unless
         // Chrome is launched with this flag. `--hide-scrollbars` is
@@ -278,7 +292,7 @@ fn build_chrome_args(options: &LaunchOptions) -> Result<ChromeArgs, String> {
         .iter()
         .any(|a| a.starts_with("--start-maximized") || a.starts_with("--window-size="));
 
-    if !has_window_size && options.headless && !has_extensions {
+    if !has_window_size && launch_headless() && !has_extensions {
         let (w, h) = options.viewport_size.unwrap_or((1280, 720));
         args.push(format!("--window-size={},{}", w, h));
     }
@@ -759,6 +773,26 @@ fn running_process_cmdlines() -> Option<Vec<String>> {
 }
 
 pub async fn auto_connect_cdp() -> Result<String, String> {
+    // Prefer the dialog-free `ab-connect` extension relay when it is live.
+    // The relay drives the user's REAL Chrome via the extension's
+    // `chrome.debugger` permission, which — unlike a raw `--remote-debugging-port`
+    // CDP attach — never triggers Chrome 136+'s per-connection
+    // "Allow remote debugging?" consent modal. The native-messaging host writes
+    // ~/.agent-browser/relay-cdp-url while connected and removes it on exit, so a
+    // present URL means the relay is up. This must win over the DevToolsActivePort
+    // / :9222 probes below: if the user's Chrome happens to also be listening on a
+    // debug port, attaching there would pop the consent dialog and defeat the
+    // whole zero-interaction extension path.
+    if let Some(relay) = crate::connect::relay_url() {
+        // The relay is a local CDP-over-WS endpoint we connect to like Chrome.
+        // A bare TCP liveness check (no WS upgrade) confirms it is actually
+        // accepting before we commit, mirroring the consent-free probe used for
+        // DevToolsActivePort.
+        if relay_is_live(&relay).await {
+            return Ok(relay);
+        }
+    }
+
     let user_data_dirs = get_chrome_user_data_dirs();
 
     for dir in &user_data_dirs {
@@ -836,6 +870,22 @@ async fn tcp_port_alive(port: u16) -> bool {
     )
 }
 
+/// Consent-free liveness for the `ab-connect` relay ws URL (`ws://127.0.0.1:<port>/…`).
+/// Parses the port and does a bare TCP connect — a stale relay-cdp-url file
+/// (host exited without cleanup) must not divert auto-connect away from the
+/// working port path.
+async fn relay_is_live(ws_url: &str) -> bool {
+    let port = ws_url
+        .strip_prefix("ws://")
+        .and_then(|rest| rest.split('/').next())
+        .and_then(|hostport| hostport.rsplit(':').next())
+        .and_then(|p| p.parse::<u16>().ok());
+    match port {
+        Some(p) => tcp_port_alive(p).await,
+        None => false,
+    }
+}
+
 /// Returns the default Chrome user-data directory paths for the current platform.
 /// Includes Chrome, Chrome Canary, Chromium, and Brave.
 pub fn get_chrome_user_data_dirs() -> Vec<PathBuf> {
@@ -1520,24 +1570,44 @@ mod tests {
     }
 
     #[test]
-    fn test_build_args_headless_includes_headless_flag() {
+    fn test_build_args_forbids_headless_by_default() {
+        // Stealth fork: headless is FORBIDDEN. `headless: true` is ignored — the
+        // launch is always headed (no --headless / swiftshader / forced size).
+        let g = EnvGuard::new(&["AGENT_BROWSER_ALLOW_HEADLESS"]);
+        g.remove("AGENT_BROWSER_ALLOW_HEADLESS");
+        let opts = LaunchOptions {
+            headless: true,
+            ..Default::default()
+        };
+        let result = build_chrome_args(&opts).unwrap();
+        assert!(
+            !result.args.iter().any(|a| a.contains("--headless")),
+            "headless must be forbidden even when the headless option is true"
+        );
+        assert!(!result
+            .args
+            .iter()
+            .any(|a| a == "--enable-unsafe-swiftshader"));
+        if let Some(dir) = result.temp_user_data_dir {
+            let _ = std::fs::remove_dir_all(&dir);
+        }
+    }
+
+    #[test]
+    fn test_build_args_allow_headless_escape() {
+        // The only way back to headless: an explicit opt-in for display-less servers.
+        let g = EnvGuard::new(&["AGENT_BROWSER_ALLOW_HEADLESS"]);
+        g.set("AGENT_BROWSER_ALLOW_HEADLESS", "1");
         let opts = LaunchOptions {
             headless: true,
             ..Default::default()
         };
         let result = build_chrome_args(&opts).unwrap();
         assert!(result.args.iter().any(|a| a == "--headless=new"));
-        assert!(result.args.iter().any(|a| a == "--hide-scrollbars"));
-        assert!(result
-            .args
-            .iter()
-            .any(|a| a == "--enable-unsafe-swiftshader"));
         assert!(result.args.iter().any(|a| a == "--window-size=1280,720"));
-        // Temp dir created when no profile
+        if let Some(dir) = result.temp_user_data_dir {
-        assert!(result.temp_user_data_dir.is_some());
+            let _ = std::fs::remove_dir_all(&dir);
-        let dir = result.temp_user_data_dir.unwrap();
+        }
-        assert!(dir.exists());
-        let _ = std::fs::remove_dir_all(&dir);
     }
 
     #[test]
@@ -2166,4 +2236,35 @@ mod tests {
         let result = resolve_cdp_from_active_port(port, "/devtools/browser/dead").await;
         assert!(result.is_err(), "should fail when nothing is listening");
     }
+
+    #[tokio::test]
+    async fn test_relay_is_live_true_when_listening() {
+        let listener = tokio::net::TcpListener::bind("127.0.0.1:0").await.unwrap();
+        let port = listener.local_addr().unwrap().port();
+        let url = format!("ws://127.0.0.1:{}/abc-guid", port);
+        assert!(
+            relay_is_live(&url).await,
+            "relay_is_live should be true while the port is accepting"
+        );
+    }
+
+    #[tokio::test]
+    async fn test_relay_is_live_false_when_dead() {
+        // Bind to grab a free port, then drop so nothing is listening.
+        let listener = tokio::net::TcpListener::bind("127.0.0.1:0").await.unwrap();
+        let port = listener.local_addr().unwrap().port();
+        drop(listener);
+        let url = format!("ws://127.0.0.1:{}/abc-guid", port);
+        assert!(
+            !relay_is_live(&url).await,
+            "relay_is_live must be false for a stale relay-cdp-url (host exited)"
+        );
+    }
+
+    #[tokio::test]
+    async fn test_relay_is_live_false_on_malformed_url() {
+        assert!(!relay_is_live("not-a-ws-url").await);
+        assert!(!relay_is_live("ws://127.0.0.1/no-port").await);
+        assert!(!relay_is_live("ws://127.0.0.1:notaport/x").await);
+    }
 }

cli/src/native/stealth.rs

@@ -270,13 +270,18 @@ pub fn strip_source_url_labels(input: &str) -> String {
     re_block.replace_all(&output, "").to_string()
 }
 
+/// The legacy `navigator.platform` value (set via the CDP
+/// `Emulation.setUserAgentOverride` `platform` field). This is NOT the UA-CH
+/// platform (see `platform_hint`): real Chrome reports `MacIntel` on macOS and
+/// `Linux x86_64` on Linux, so emitting the UA-CH form ("macOS"/"Linux") here is
+/// a detectable mismatch against the UA's "Intel Mac OS X" / Linux strings.
 fn platform_string() -> &'static str {
     if cfg!(target_os = "macos") {
-        "macOS"
+        "MacIntel"
     } else if cfg!(target_os = "windows") {
         "Win32"
     } else {
-        "Linux"
+        "Linux x86_64"
     }
 }
 

cli/src/native/stealth_scripts.js

@@ -394,6 +394,24 @@ const __abStealth = { locale: "en-US", languages: ["en-US", "en"], allowWebGLCon
   defineVendor(navigator);
 })();
 (function(){
+  // Native > JS lies: a real headed Chrome already exposes the correct, fully
+  // native navigator.plugins (5 PDF-viewer aliases, a native item() that does
+  // the WebIDL uint32-index wrap, length on the prototype). Overriding that
+  // with a JS fake is strictly worse — it ships a non-native item() whose
+  // .toString() reveals the patch, breaks the uint32 wrap (incolumitas
+  // overflowTest), and pins an anachronistic "Native Client" plugin that modern
+  // Chrome removed. Since this fork forbids headless and always launches headed,
+  // the native plugins are present, so we leave them alone. We only fall back to
+  // a synthetic list when native plugins are genuinely empty (e.g. the
+  // discouraged AGENT_BROWSER_ALLOW_HEADLESS escape on old headless).
+  try {
+    const np = navigator.plugins;
+    const itemNative =
+      np && typeof np.item === 'function' &&
+      /\[native code\]/.test(Function.prototype.toString.call(np.item));
+    if (np && np.length > 0 && itemNative) return;
+  } catch (e) {}
+
   const makeMimeType = (type, suffixes, description) => {
     const mime = Object.create(MimeType.prototype);
     Object.defineProperties(mime, {
@@ -427,40 +445,54 @@ const __abStealth = { locale: "en-US", languages: ["en-US", "en"], allowWebGLCon
     return plugin;
   };
 
+  // Make a fake method masquerade as native: name + `[native code]` toString.
+  const maskNative = (fn, name) => {
+    Object.defineProperty(fn, 'name', { value: name, configurable: true });
+    Object.defineProperty(fn, 'toString', {
+      value: () => `function ${name}() { [native code] }`,
+      configurable: true,
+      writable: true,
+    });
+    return fn;
+  };
+
+  // Modern Chrome (since ~v109) exposes exactly these 5 PDF-viewer aliases and
+  // two mimeTypes (application/pdf, text/pdf). Native Client was removed years
+  // ago, so it must NOT appear. Each plugin carries both mimeTypes.
   const pdfMime = makeMimeType('application/pdf', 'pdf', 'Portable Document Format');
-  const chromePdfMime = makeMimeType(
+  const textPdfMime = makeMimeType('text/pdf', 'pdf', 'Portable Document Format');
-    'application/x-google-chrome-pdf',
+  const mimes = [pdfMime, textPdfMime];
-    'pdf',
-    'Portable Document Format'
-  );
-  const naclMime = makeMimeType('application/x-nacl', '', 'Native Client Executable');
-  const pnaclMime = makeMimeType('application/x-pnacl', '', 'Portable Native Client Executable');
 
   const plugins = [
-    makePlugin('Chrome PDF Plugin', 'Portable Document Format', 'internal-pdf-viewer', [chromePdfMime]),
+    'PDF Viewer',
-    makePlugin('Chrome PDF Viewer', '', 'mhjfbmdgcfjbbpaeojofohoefgiehjai', [pdfMime]),
+    'Chrome PDF Viewer',
-    makePlugin('Native Client', '', 'internal-nacl-plugin', [naclMime, pnaclMime]),
+    'Chromium PDF Viewer',
-  ];
+    'Microsoft Edge PDF Viewer',
+    'WebKit built-in PDF',
+  ].map((name) => makePlugin(name, 'Portable Document Format', 'internal-pdf-viewer', mimes));
+
   const pluginArray = Object.create(PluginArray.prototype);
   plugins.forEach((p, i) => {
     pluginArray[i] = p;
     pluginArray[p.name] = p;
   });
   Object.defineProperty(pluginArray, 'length', { get: () => plugins.length });
-  pluginArray.item = (i) => plugins[i] || null;
+  // `i >>> 0` replicates the WebIDL unsigned-long index coercion, so
-  pluginArray.namedItem = (name) => plugins.find(p => p.name === name) || null;
+  // item(2**32) wraps to item(0) like the real native PluginArray.item.
-  pluginArray.refresh = () => {};
+  pluginArray.item = maskNative((i) => plugins[i >>> 0] || null, 'item');
+  pluginArray.namedItem = maskNative((name) => plugins.find(p => p.name === name) || null, 'namedItem');
+  pluginArray.refresh = maskNative(() => {}, 'refresh');
   pluginArray[Symbol.iterator] = function*() { for (const p of plugins) yield p; };
 
-  const mimeTypes = [chromePdfMime, pdfMime, naclMime, pnaclMime];
+  const mimeTypes = [pdfMime, textPdfMime];
   const mimeTypeArray = Object.create(MimeTypeArray.prototype);
   mimeTypes.forEach((m, i) => {
     mimeTypeArray[i] = m;
     mimeTypeArray[m.type] = m;
   });
   Object.defineProperty(mimeTypeArray, 'length', { get: () => mimeTypes.length });
-  mimeTypeArray.item = (i) => mimeTypes[i] || null;
+  mimeTypeArray.item = maskNative((i) => mimeTypes[i >>> 0] || null, 'item');
-  mimeTypeArray.namedItem = (name) => mimeTypes.find(m => m.type === name) || null;
+  mimeTypeArray.namedItem = maskNative((name) => mimeTypes.find(m => m.type === name) || null, 'namedItem');
   mimeTypeArray[Symbol.iterator] = function*() { for (const m of mimeTypes) yield m; };
 
   Object.defineProperty(navigator, 'plugins', {

cli/src/output.rs

@@ -1082,7 +1082,7 @@ Global Options:
   --json               Output as JSON
   --session <name>     Use specific session
   --headers <json>     Set HTTP headers (scoped to this origin)
-  --headed             Show browser window
+  --headed             Show browser window (default; headless is forbidden — it's a bot tell)
   --enable react-devtools   Inject the React DevTools hook before any page JS
   --init-script <path>      Register a page init script (repeatable)
 
@@ -3114,7 +3114,8 @@ Options:
   --screenshot-dir <path>    Default screenshot output directory (or AGENT_BROWSER_SCREENSHOT_DIR)
   --screenshot-quality <n>   JPEG quality 0-100; ignored for PNG (or AGENT_BROWSER_SCREENSHOT_QUALITY)
   --screenshot-format <fmt>  Screenshot format: png, jpeg (or AGENT_BROWSER_SCREENSHOT_FORMAT)
-  --headed                   Show browser window (not headless) (or AGENT_BROWSER_HEADED env)
+  --headed                   Always on (default). Headless is forbidden (bot-detection tell);
+                             display-less servers can opt back in with AGENT_BROWSER_ALLOW_HEADLESS=1
   --cdp <port>               Connect via CDP (Chrome DevTools Protocol)
   --color-scheme <scheme>    Color scheme: dark, light, no-preference (or AGENT_BROWSER_COLOR_SCHEME)
   --download-path <path>     Default download directory (or AGENT_BROWSER_DOWNLOAD_PATH)

extensions/ab-connect/manifest.json

@@ -1,6 +1,6 @@
 {
   "manifest_version": 3,
-  "name": "agent-browser connect",
+  "name": "agent-browser-stealth",
   "version": "0.4.0",
   "description": "Let agent-browser drive your logged-in Chrome — install once, no token, no per-use confirmation.",
   "key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA6vQIyscGIPYPZdSpPwPL0+0gxUROyRgCpmvCSDoc8XUm4qm97VbKnD9Ijc1lV22lNWZtE78gaRjt6BeSfuMgnBymnhLKjN1gU6AI5QUU0mrJyeHdWKvrKQR5FmsM2A7Xr1ykE2SiiS8zNUS3Y/6O5l+Nva7wrVy6E4a2dkBVQkOsu+DV+nEZvhIyuDY5D5SPXqNwUTWTaglwj5mjvHz36xSwCWlPmrtJ+ED0AUyrb2z4GIOmvk4kqtBVrh/UD058klLo4CkYOnIybB5aV6WYuwarfPY4bF/dLggPem+ewLNTUNBuwrxj/A4nUv0LJTuRO8rR7f8WR9qnRCY0Ic5saQIDAQAB",
@@ -24,6 +24,6 @@
     "type": "module"
   },
   "action": {
-    "default_title": "agent-browser connect"
+    "default_title": "agent-browser-stealth"
   }
 }

package.json

@@ -1,7 +1,7 @@
 {
   "name": "agent-browser-stealth",
-  "version": "0.27.0-fork.25",
+  "version": "0.27.0-fork.29",
-  "description": "Browser automation CLI for AI agents \u2014 stealth fork with anti-detection",
+  "description": "Browser automation CLI for AI agents — stealth fork with anti-detection",
   "type": "module",
   "packageManager": "pnpm@11.1.3",
   "files": [

skill-data/core/SKILL.md

@@ -57,6 +57,15 @@ GUI-automation tool** like the `cua-driver` skill — see
 `agent-browser extension connect`. After that it's zero-confirmation, zero-token
 CLI. Use `--launch` instead when a fresh, isolated browser is fine.
 
+Each `--session` that connects gets its **own colored Chrome tab group** (named
+after the session) and drives only its own tabs — multiple agents share the one
+real browser without cross-talk, and the user's own tabs are never grouped. CDP
+drives the page without moving the user's mouse/keyboard, so it doesn't fight
+them for control. **Anti-detection ranking: this real logged-in Chrome (extension
+connect) > a headed launched browser > headless (forbidden).** A genuine human
+browser has no headless/automation tells at all, so prefer it for anything
+anti-bot-sensitive.
+
 ## Two ways to drive a page — and when to drop to `eval`
 
 You have a **real Chrome with the user's DOM**. Two layers, mix them freely:
@@ -506,7 +515,9 @@ and [references/authentication.md](references/authentication.md).
 ```bash
 --session <name>        # isolated browser session
 --json                  # JSON output (for machine parsing)
---headed                # show the window (default is headless)
+--headed                # default & always-on for stealth — headless is FORBIDDEN
+                        #   (a bot tell: creepjs flags ~33% headless vs 0% headed).
+                        #   Display-less servers only: AGENT_BROWSER_ALLOW_HEADLESS=1
 --auto-connect          # connect to an already-running Chrome
 --cdp <port>            # connect to a specific CDP port
 --profile <name|path>   # use a Chrome profile (login state survives)

skill-data/core/references/commands.md

@@ -302,7 +302,8 @@ agent-browser state load auth.json    # Restore saved state
 ```bash
 agent-browser --session <name> ...    # Isolated browser session
 agent-browser --json ...              # JSON output for parsing
-agent-browser --headed ...            # Show browser window (not headless)
+agent-browser --headed ...            # Default & always-on (stealth). Headless is FORBIDDEN
+                                      #   (bot tell); display-less servers: AGENT_BROWSER_ALLOW_HEADLESS=1
 agent-browser --full ...              # Full page screenshot (-f)
 agent-browser --cdp <port> ...        # Connect via Chrome DevTools Protocol
 agent-browser -p <provider> ...       # Cloud browser provider (--provider)