diff --git a/tests/conftest.py b/tests/conftest.py
index ee031fc05a4..81067be6f3e 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -213,6 +213,14 @@ _HERMES_BEHAVIORAL_VARS = frozenset({
     "HERMES_KANBAN_CLAIM_LOCK",
     "HERMES_KANBAN_DISPATCH_IN_GATEWAY",
     "HERMES_TENANT",
+    # Dashboard OAuth auth gate (PR #30156). When set, the bundled
+    # dashboard-auth `nous` plugin auto-registers itself on plugin discovery,
+    # which is triggered by any `/api/status` call. That leaks a provider
+    # into the dashboard_auth registry across tests in the same worker and
+    # makes assertions like `auth_providers == []` flaky. CI never sets
+    # these, so production tests must not see them either.
+    "HERMES_DASHBOARD_OAUTH_CLIENT_ID",
+    "HERMES_DASHBOARD_PORTAL_URL",
     "TERMINAL_CWD",
     "TERMINAL_ENV",
     "TERMINAL_CONTAINER_CPU",