diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index b2441e7b..0cd0ac39 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -269,6 +269,16 @@ repos:
         stages: [pre-commit]
         require_serial: true
 
+      - id: no-defaults
+        name: no-defaults
+        entry: uv run --extra=dev no-defaults
+        language: python
+        types_or: [python]
+        additional_dependencies:
+          - *uv_version
+        stages: [pre-commit]
+        require_serial: true
+
       - id: doc8
         name: doc8
         entry: uv run --extra=dev -m doc8
diff --git a/pyproject.toml b/pyproject.toml
index 14a1192f..0410a509 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -48,6 +48,7 @@ optional-dependencies.dev = [
     "interrogate==1.7.0",
     "mypy[faster-cache]==2.3.0",
     "mypy-strict-kwargs==2026.7.19.1",
+    "no-defaults==1.0.1",
     "prek==0.4.11",
     "pydocstringformatter==1.0.0",
     "pydocstyle==6.3",
@@ -151,6 +152,7 @@ lint.per-file-ignores."tests/*.py" = [
 lint.unfixable = [
     "ERA001",
 ]
+lint.external = [ "NOD" ]
 lint.flake8-tidy-imports.banned-api."typing.cast".msg = "typing.cast is banned: use explicit type narrowing or a typed variable instead."
 lint.pydocstyle.convention = "google"
 
@@ -438,3 +440,7 @@ ignore_path = [
 [tool.yamlfix]
 section_whitelines = 1
 whitelines = 1
+
+[tool.no_defaults]
+private_only = true
+per_file_enforcement."tests/**" = "all"