diff --git a/src/primaite/agents/agent_abc.py b/src/primaite/agents/agent_abc.py
index 9b0dd031..af860996 100644
--- a/src/primaite/agents/agent_abc.py
+++ b/src/primaite/agents/agent_abc.py
@@ -254,7 +254,7 @@ class AgentSessionABC(ABC):
     def _get_latest_checkpoint(self) -> None:
         pass
 
-    def load(self, path: Union[str, Path]):
+    def load(self, path: Union[str, Path]) -> None:
         """Load an agent from file."""
         md_dict, training_config_path, laydown_config_path = parse_session_metadata(path)
 
diff --git a/src/primaite/agents/hardcoded_abc.py b/src/primaite/agents/hardcoded_abc.py
index ec4b53e7..0336f00e 100644
--- a/src/primaite/agents/hardcoded_abc.py
+++ b/src/primaite/agents/hardcoded_abc.py
@@ -2,7 +2,9 @@
 import time
 from abc import abstractmethod
 from pathlib import Path
-from typing import Optional, Union
+from typing import Any, Optional, Union
+
+import numpy as np
 
 from primaite import getLogger
 from primaite.agents.agent_abc import AgentSessionABC
@@ -24,7 +26,7 @@ class HardCodedAgentSessionABC(AgentSessionABC):
         training_config_path: Optional[Union[str, Path]] = "",
         lay_down_config_path: Optional[Union[str, Path]] = "",
         session_path: Optional[Union[str, Path]] = None,
-    ):
+    ) -> None:
         """
         Initialise a hardcoded agent session.
 
@@ -37,7 +39,7 @@ class HardCodedAgentSessionABC(AgentSessionABC):
         super().__init__(training_config_path, lay_down_config_path, session_path)
         self._setup()
 
-    def _setup(self):
+    def _setup(self) -> None:
         self._env: Primaite = Primaite(
             training_config_path=self._training_config_path,
             lay_down_config_path=self._lay_down_config_path,
@@ -48,16 +50,16 @@ class HardCodedAgentSessionABC(AgentSessionABC):
         self._can_learn = False
         self._can_evaluate = True
 
-    def _save_checkpoint(self):
+    def _save_checkpoint(self) -> None:
         pass
 
-    def _get_latest_checkpoint(self):
+    def _get_latest_checkpoint(self) -> None:
         pass
 
     def learn(
         self,
-        **kwargs,
-    ):
+        **kwargs: Any,
+    ) -> None:
         """
         Train the agent.
 
@@ -66,13 +68,13 @@ class HardCodedAgentSessionABC(AgentSessionABC):
         _LOGGER.warning("Deterministic agents cannot learn")
 
     @abstractmethod
-    def _calculate_action(self, obs):
+    def _calculate_action(self, obs: np.ndarray) -> None:
         pass
 
     def evaluate(
         self,
-        **kwargs,
-    ):
+        **kwargs: Any,
+    ) -> None:
         """
         Evaluate the agent.
 
@@ -103,14 +105,14 @@ class HardCodedAgentSessionABC(AgentSessionABC):
         self._env.close()
 
     @classmethod
-    def load(cls, path=None):
+    def load(cls, path: Union[str, Path] = None) -> None:
         """Load an agent from file."""
         _LOGGER.warning("Deterministic agents cannot be loaded")
 
-    def save(self):
+    def save(self) -> None:
         """Save the agent."""
         _LOGGER.warning("Deterministic agents cannot be saved")
 
-    def export(self):
+    def export(self) -> None:
         """Export the agent to transportable file format."""
         _LOGGER.warning("Deterministic agents cannot be exported")
diff --git a/src/primaite/utils/session_metadata_parser.py b/src/primaite/utils/session_metadata_parser.py
index eb3c3339..0b0eaaec 100644
--- a/src/primaite/utils/session_metadata_parser.py
+++ b/src/primaite/utils/session_metadata_parser.py
@@ -1,7 +1,7 @@
 # Crown Owned Copyright (C) Dstl 2023. DEFCON 703. Shared in confidence.
 import json
 from pathlib import Path
-from typing import Union
+from typing import Any, Dict, Union
 
 import yaml
 
@@ -10,7 +10,7 @@ from primaite import getLogger
 _LOGGER = getLogger(__name__)
 
 
-def parse_session_metadata(session_path: Union[Path, str], dict_only=False):
+def parse_session_metadata(session_path: Union[Path, str], dict_only: bool = False) -> Dict[str, Any]:
     """
     Loads a session metadata from the given directory path.