diff --git a/pyproject.toml b/pyproject.toml
index 564a0629e..f709fc75e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -84,3 +84,4 @@ markers = ["refactor_guard: permanent architecture deletion guards"]
 
 [tool.mypy]
 follow_untyped_imports = true
+mypy_path = ["src", "tools"]