diff --git a/codex-skill.yaml b/codex-skill.yaml
index 79217dc..d031b24 100644
--- a/codex-skill.yaml
+++ b/codex-skill.yaml
@@ -4,6 +4,7 @@
 style:
   paradigm: "OO"
   framework_bias: "Spring-like layering"
+  layering_bias: "Controller -> Service -> Repository with explicit domain/data layers"
   class_file_bias: "small"
   dataclass_bias: "strong"
 
@@ -39,6 +40,20 @@ layering_by_language:
     domain: ["domain", "entities", "value-objects"]
     dto: ["dto", "contracts", "types"]
     mapping: ["mappers"]
+  kotlin:
+    controller: ["@RestController", "Controller"]
+    service: ["@Service", "UseCase"]
+    repository: ["@Repository"]
+    domain: ["domain"]
+    dto: ["dto"]
+    mapping: ["mapper"]
+  python:
+    controller: ["controllers", "routes"]
+    service: ["services", "use_cases"]
+    repository: ["repositories", "adapters", "ports"]
+    domain: ["domain", "entities", "value_objects"]
+    dto: ["dto", "contracts", "types"]
+    mapping: ["mappers"]
   cpp:
     controller: ["api", "handlers", "endpoints"]
     service: ["services", "use_cases"]
@@ -48,8 +63,9 @@ layering_by_language:
     mapping: ["mappers"]
 
 size_limits:
-  class_file_lines_target: [50, 200]
-  methods_lines_soft_cap: 25
+  class_file_lines_target: [40, 160]
+  class_file_lines_soft_cap: 200
+  methods_lines_soft_cap: 20
   cyclomatic_complexity_soft_cap: 8
   one_top_level_class_per_file: true
 
@@ -73,21 +89,33 @@ naming:
   repository_suffix: "Repository"
   dto_suffixes: ["Request", "Response", "Dto"]
   mapper_suffix: "Mapper"
-  exception_suffix: "Exception"
+  exception_suffixes: ["Exception"]
 
 naming_by_language:
+  kotlin:
+    controller_suffixes: ["Controller"]
+    service_suffixes: ["Service", "UseCase"]
+    repository_suffixes: ["Repository"]
+    dto_suffixes: ["Request", "Response", "Dto"]
+    exception_suffixes: ["Exception"]
+  python:
+    controller_suffixes: ["Controller", "Routes"]
+    service_suffixes: ["Service", "UseCase"]
+    repository_suffixes: ["Repository", "Port", "Adapter"]
+    dto_suffixes: ["Request", "Response", "Dto"]
+    exception_suffixes: ["Error"]
   typescript:
     controller_suffixes: ["Controller", "Routes"]
     service_suffixes: ["Service", "UseCase"]
     repository_suffixes: ["Repository", "Port", "Adapter"]
     dto_suffixes: ["Request", "Response", "Dto"]
-    error_suffixes: ["Error"]
+    exception_suffixes: ["Error"]
   cpp:
     controller_suffixes: ["Handler", "Endpoint"]
     service_suffixes: ["Service", "UseCase"]
     repository_suffixes: ["Repository", "Port", "Adapter"]
     dto_suffixes: ["Request", "Response", "Dto"]
-    error_suffixes: ["Error"]
+    exception_suffixes: ["Error"]
 
 dependencies:
   domain_must_not_depend_on_framework: true
@@ -97,10 +125,12 @@ dependencies:
 typescript_rules:
   module_structure:
     - "Prefer one exported class per file (with small helper types allowed)."
+    - "DTO files may export multiple related types (no behavior)."
     - "Avoid deep barrel exports that obscure dependency direction."
   types:
     - "Prefer explicit types at boundaries."
     - "Use readonly properties; prefer Readonly<T> for DTO shapes."
+    - "Use type/interface for DTOs; use classes for behavior."
   runtime_validation:
     - "If validation is needed, keep it at boundaries (e.g., schema/validator) not inside controllers."
   async:
@@ -125,6 +155,8 @@ testing:
 
 testing_by_language:
   java: ["JUnit5", "SpringBootTest when needed"]
+  kotlin: ["JUnit5 or Kotest"]
+  python: ["Pytest"]
   typescript: ["Jest"]
   cpp: ["GoogleTest (if present) or Catch2 (if present); otherwise provide minimal harness"]