chore(release): 0.27.0-fork.26 — stealth navigator.platform=MacIntel (anti-detection fix)

platform_string() feeds the CDP Emulation.setUserAgentOverride 'platform' field,
which sets the LEGACY navigator.platform. It was returning the UA-CH form
("macOS"/"Linux") — but real Chrome reports navigator.platform = "MacIntel" on
macOS and "Linux x86_64" on Linux. "macOS" contradicts the UA's "Intel Mac OS X"
and is a trivial bot-detection tell (platform vs UA mismatch). UA-CH
(navigator.userAgentData.platform via platform_hint) stays "macOS"/"Windows"/
"Linux" — that form is correct there.

Verified locally on bot.sannysoft.com (all rows green incl. navigator.platform=
MacIntel) + eval probes: webdriver false, no Headless in UA, real WebGL
(Apple M3 Metal, not SwiftShader), plugins/permissions consistent.

cli/Cargo.lock

@@ -45,7 +45,7 @@ dependencies = [
 
 [[package]]
 name = "agent-browser-stealth"
-version = "0.27.0-fork.24"
+version = "0.27.0-fork.26"
 dependencies = [
  "aes-gcm",
  "async-trait",

cli/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "agent-browser-stealth"
-version = "0.27.0-fork.24"
+version = "0.27.0-fork.26"
 edition = "2021"
 description = "Fast browser automation CLI for AI agents"
 license = "Apache-2.0"

cli/src/native/relay.rs

@@ -107,6 +107,22 @@ impl RelayState {
         let session_id = raw.get("sessionId").and_then(|s| s.as_str());
 
         match method {
+            // Browser-level command the daemon uses as its liveness probe
+            // (`is_connection_alive` → `Browser.getVersion`). The extension only
+            // speaks per-tab `chrome.debugger`, so forwarding it errors → the
+            // daemon would deem the connection dead and reconnect+re-discover on
+            // EVERY command, resetting the active tab (eval/screenshot drift).
+            // Answer it locally so the relay connection reads as alive.
+            "Browser.getVersion" => ClientRoute::Local(json!({
+                "id": id,
+                "result": {
+                    "protocolVersion": "1.3",
+                    "product": "Chrome/ab-connect-relay",
+                    "revision": "",
+                    "userAgent": "",
+                    "jsVersion": ""
+                }
+            })),
             // Discovery is best-effort and event-driven in real CDP; abs only
             // reads the getTargets result, so an empty ack is enough here.
             "Target.setDiscoverTargets" | "Target.setAutoAttach" => {
@@ -302,6 +318,21 @@ mod tests {
         }
     }
 
+    #[test]
+    fn browser_get_version_is_answered_locally() {
+        // Liveness probe must NOT be forwarded (the extension can't do
+        // browser-level commands) — else the daemon reconnects on every command.
+        let mut s = RelayState::new();
+        let route = s.route_client_command(1, &json!({ "id": 7, "method": "Browser.getVersion" }));
+        match route {
+            ClientRoute::Local(v) => {
+                assert_eq!(v["id"], 7);
+                assert!(v["result"]["protocolVersion"].is_string());
+            }
+            _ => panic!("Browser.getVersion must be answered locally"),
+        }
+    }
+
     #[test]
     fn attach_to_target_returns_known_session() {
         let mut s = RelayState::new();

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"
     }
 }
 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "agent-browser-stealth",
-  "version": "0.27.0-fork.24",
+  "version": "0.27.0-fork.26",
   "description": "Browser automation CLI for AI agents \u2014 stealth fork with anti-detection",
   "type": "module",
   "packageManager": "pnpm@11.1.3",