diff --git a/pyproject.toml b/pyproject.toml
index d558927f..4ea463aa 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -49,6 +49,8 @@ markers = [
     "docker: docker build and run test (opt-in via RUN_DOCKER_TEST=1)",
     "live: marks tests as live visualization tests (not in CI by default)",
     "clean_baseline: opt-in marker that resets controller state via /api/reset_session before the test starts (FR5, Phase 6 of test_infrastructure_hardening_20260609)",
+    "tier2_sandbox: opt-in sandbox tests (set TIER2_SANDBOX_TESTS=1)",
+    "tier2_smoke: opt-in full e2e (set TIER2_SANDBOX_TESTS=1 TIER2_SMOKE=1)",
 ]
 
 [tool.mypy]