diff --git a/bridges/python/src/sdk/leon.py b/bridges/python/src/sdk/leon.py
index d21ee2c3..a79b74f6 100644
--- a/bridges/python/src/sdk/leon.py
+++ b/bridges/python/src/sdk/leon.py
@@ -2,6 +2,7 @@ import random
 import sys
 from time import sleep
 
+from types import
 from ..constants import SKILL_SRC_CONFIG, SKILL_CONFIG, INTENT_OBJECT
 
 class Leon:
@@ -11,7 +12,7 @@ class Leon:
 		if not Leon.instance:
 			Leon.instance = self
 
-	def get_src_config(key: str = None):
+	def get_src_config(self, key: str = None):
 		"""
 		Get source configuration
 		"""
@@ -24,7 +25,7 @@ class Leon:
             print('Error while getting source configuration:', e)
             return {}
 
-	def set_answer_data(answer_key: str, data = None):
+	def set_answer_data(self, answer_key: str, data = None):
 		"""
 		Apply data to the answer
 		"""
@@ -66,7 +67,7 @@ class Leon:
 
         return None
 
-    def answer(answer_input):
+    def answer(self, answer_input: AnswerInput) -> None:
     	"""
     	Send an answer to the core
     	"""
diff --git a/bridges/python/src/sdk/types.py b/bridges/python/src/sdk/types.py
new file mode 100644
index 00000000..5d29c5f0
--- /dev/null
+++ b/bridges/python/src/sdk/types.py
@@ -0,0 +1,22 @@
+from typing import Dict, Any, Optional, List
+
+# TODO
+
+class Answer:
+	key: Optional[str]
+    widget: Optional[Any]
+    data: Optional[AnswerData]
+    core: Optional[Dict[str, Any]]
+
+class AnswerInput:
+  key: Optional[str]
+  widget: Any
+  data: Optional[AnswerData]
+  core: Dict[str, Any]
+
+class AnswerData:
+  pass
+
+class AnswerConfig:
+  text: str
+  speech: str