diff --git a/agent/anthropic_credentials.py b/agent/anthropic_credentials.py
index ed3f57f0ac90d..e994e4d5f822e 100644
--- a/agent/anthropic_credentials.py
+++ b/agent/anthropic_credentials.py
@@ -506,7 +506,7 @@ def _generate_pkce() -> tuple:
     return verifier, challenge
 
 
-def run_hermes_oauth_login_pure() -> Optional[Dict[str, Any]]:
+def run_hermes_oauth_login_pure(open_browser: bool = True) -> Optional[Dict[str, Any]]:
     """Run Hermes-native OAuth PKCE flow and return credential state."""
     import webbrowser
     from urllib.parse import urlencode
@@ -529,7 +529,7 @@ def run_hermes_oauth_login_pure() -> Optional[Dict[str, Any]]:
         from hermes_cli.auth import _can_open_graphical_browser as _can_open_gui
     except Exception:
         _can_open_gui = lambda: True  # noqa: E731 — degrade to prior behavior
-    if _can_open_gui():
+    if open_browser and _can_open_gui():
         with contextlib.suppress(Exception):
             webbrowser.open(auth_url)
             print("  (Browser opened automatically)")
diff --git a/hermes_cli/auth_commands.py b/hermes_cli/auth_commands.py
index 6bc57fde25c9f..ce1fc385312af 100644
--- a/hermes_cli/auth_commands.py
+++ b/hermes_cli/auth_commands.py
@@ -180,7 +180,9 @@ def _format_exhausted_status(entry) -> str:
 
 def _anthropic_oauth_login(args) -> dict:
     from agent import anthropic_credentials as anthropic_mod
-    creds = anthropic_mod.run_hermes_oauth_login_pure()
+    creds = anthropic_mod.run_hermes_oauth_login_pure(
+        open_browser=not getattr(args, "no_browser", False),
+    )
     if not creds:
         raise SystemExit("Anthropic OAuth login did not return credentials.")
     return creds
diff --git a/tests/agent/test_anthropic_oauth_pkce.py b/tests/agent/test_anthropic_oauth_pkce.py
index 3336317643487..d35d237ab16f7 100644
--- a/tests/agent/test_anthropic_oauth_pkce.py
+++ b/tests/agent/test_anthropic_oauth_pkce.py
@@ -84,6 +84,20 @@ def fake_urlopen(req, *_a, **_kw):
     monkeypatch.setattr(urllib.request, "urlopen", fake_urlopen)
 
 
+def test_no_browser_skips_automatic_browser_open(monkeypatch):
+    opened_urls = []
+    monkeypatch.setattr("webbrowser.open", opened_urls.append)
+    monkeypatch.setattr(
+        "hermes_cli.auth._can_open_graphical_browser", lambda: True
+    )
+    monkeypatch.setattr("builtins.input", lambda *_a, **_kw: "")
+
+    from agent.anthropic_credentials import run_hermes_oauth_login_pure
+
+    assert run_hermes_oauth_login_pure(open_browser=False) is None
+    assert opened_urls == []
+
+
 def test_authorization_url_state_is_not_pkce_verifier(monkeypatch, tmp_path):
     """The ``state`` parameter in the authorization URL must NOT equal the
     PKCE ``code_verifier``.
diff --git a/tests/hermes_cli/test_auth_commands.py b/tests/hermes_cli/test_auth_commands.py
index a0c5fe8e5a8cd..30a98b4ca3c86 100644
--- a/tests/hermes_cli/test_auth_commands.py
+++ b/tests/hermes_cli/test_auth_commands.py
@@ -116,6 +116,45 @@ class _Args:
     assert entry["access_token"] == "sk-or-manual"
 
 
+def test_auth_add_anthropic_oauth_forwards_no_browser(tmp_path, monkeypatch):
+    monkeypatch.setenv("HERMES_HOME", str(tmp_path / "hermes"))
+    _write_auth_store(tmp_path, {"version": 1, "providers": {}})
+    token = _jwt_with_email("claude@example.com")
+    oauth_options = {}
+
+    def fake_oauth_login(*, open_browser=True):
+        oauth_options["open_browser"] = open_browser
+        return {
+            "access_token": token,
+            "refresh_token": "refresh-token",
+            "expires_at_ms": 1711234567000,
+        }
+
+    monkeypatch.setattr(
+        "agent.anthropic_credentials.run_hermes_oauth_login_pure",
+        fake_oauth_login,
+    )
+
+    from hermes_cli.auth_commands import auth_add_command
+
+    class _Args:
+        provider = "anthropic"
+        auth_type = "oauth"
+        api_key = None
+        label = None
+        no_browser = True
+
+    auth_add_command(_Args())
+
+    payload = json.loads(
+        (tmp_path / "hermes" / "auth.json").read_text(encoding="utf-8")
+    )
+    entries = payload["credential_pool"]["anthropic"]
+    entry = next(item for item in entries if item["source"] == "manual:hermes_pkce")
+    assert entry["label"] == "claude@example.com"
+    assert oauth_options == {"open_browser": False}
+
+
 def test_auth_add_configured_provider_uses_canonical_pool_key(tmp_path, monkeypatch):
     """A keyed providers row must keep its runtime slug in the auth pool."""
     hermes_home = tmp_path / "hermes"