From 7b2700c9afca19f3653a0af98d5ee35dd39bc9c6 Mon Sep 17 00:00:00 2001
From: Teknium <127238744+teknium1@users.noreply.github.com>
Date: Wed, 15 Apr 2026 03:29:37 -0700
Subject: [PATCH] fix(browser): use 127.0.0.1 instead of localhost for CDP
 default (#10231)

/browser connect set BROWSER_CDP_URL to http://localhost:9222, but
Chrome's --remote-debugging-port only binds to 127.0.0.1 (IPv4).
On macOS, 'localhost' can resolve to ::1 (IPv6) first, causing both
_resolve_cdp_override's /json/version fetch and agent-browser's
--cdp connection to fail when Chrome isn't listening on IPv6.

The socket check in the connect handler already used 127.0.0.1
explicitly and succeeded, masking the mismatch.

Use 127.0.0.1 in the default CDP URL to match what Chrome actually
binds to.
---
 cli.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cli.py b/cli.py
index 0ed2d323..97698f13 100644
--- a/cli.py
+++ b/cli.py
@@ -5956,7 +5956,7 @@ class HermesCLI:
         parts = cmd.strip().split(None, 1)
         sub = parts[1].lower().strip() if len(parts) > 1 else "status"
 
-        _DEFAULT_CDP = "http://localhost:9222"
+        _DEFAULT_CDP = "http://127.0.0.1:9222"
         current = os.environ.get("BROWSER_CDP_URL", "").strip()
 
         if sub.startswith("connect"):