diff --git a/backend/tests/unit/v1/agent/test_tool_registry.py b/backend/tests/unit/v1/agent/test_tool_registry.py
index dc80719..c91791a 100644
--- a/backend/tests/unit/v1/agent/test_tool_registry.py
+++ b/backend/tests/unit/v1/agent/test_tool_registry.py
@@ -22,6 +22,6 @@ class TestValidateToolSpec:
     def test_srv_namespace_with_backend_is_valid(self):
         validate_tool_spec({"name": "srv.search_docs", "execution_target": "backend"})
 
-    def test_other_namespace_is_valid(self):
-        validate_tool_spec({"name": "other.tool", "execution_target": "frontend"})
-        validate_tool_spec({"name": "other.tool", "execution_target": "backend"})
+    def test_other_namespace_is_rejected(self):
+        with pytest.raises(ValueError, match="must be in ui.* or srv.* namespace"):
+            validate_tool_spec({"name": "other.tool", "execution_target": "frontend"})
diff --git a/pyproject.toml b/pyproject.toml
index 4bbf5be..01e3c1b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -8,6 +8,8 @@ dependencies = [
     "asyncpg>=0.31.0",
     "basedpyright>=1.37.2",
     "celery>=5.6.2",
+    "crewai>=1.6.1",
+    "crewai-tools>=1.6.1",
     "email-validator>=2.3.0",
     "fastapi>=0.128.0",
     "pydantic>=2.11.0",