diff --git a/agent-team/tests/test_slack_live.py b/agent-team/tests/test_slack_live.py
index 48dfdf1..6d3fbf8 100644
--- a/agent-team/tests/test_slack_live.py
+++ b/agent-team/tests/test_slack_live.py
@@ -214,7 +214,19 @@ def test_poster_unsupported_response_raises_type_error() -> None:
 
 
 def test_missing_token_raises_runtime_error(monkeypatch: pytest.MonkeyPatch) -> None:
-    """No token and no SLACK_BOT_TOKEN raises a clear RuntimeError."""
+    """No token and no SLACK_BOT_TOKEN raises a clear RuntimeError.
+
+    Stub ``slack_sdk`` into ``sys.modules`` so the deferred import SUCCEEDS and
+    the no-token branch is what's under test. Without this the test is
+    environment-dependent: where slack_sdk is absent (CI) the import-missing
+    error fires first and masks the token check (local-vs-CI drift).
+    """
+    import sys
+    from types import ModuleType
+
+    fake = ModuleType("slack_sdk")
+    fake.WebClient = lambda **kw: None  # type: ignore[attr-defined]
+    monkeypatch.setitem(sys.modules, "slack_sdk", fake)
     monkeypatch.delenv("SLACK_BOT_TOKEN", raising=False)
 
     with pytest.raises(RuntimeError, match="Slack bot token"):