diff --git a/backend/apps/agents/create_sdk_hooks.py b/backend/apps/agents/create_sdk_hooks.py
index a05362a7..dbf60cef 100644
--- a/backend/apps/agents/create_sdk_hooks.py
+++ b/backend/apps/agents/create_sdk_hooks.py
@@ -98,11 +98,7 @@ def create_sdk_hooks(
 
     @typechecked
     async def post_tool_hook(input_data: dict, tool_use_id: str) -> Dict[str, Any]:
-        elapsed_ms: Optional[int] = None
-        if tool_use_id and tool_use_id in tool_start_times:
-            elapsed_ms = int((time.time() - tool_start_times.pop(tool_use_id)) * 1000)
-
-        raw_response = input_data.get("tool_response", "")
+        raw_response: str = input_data.get("tool_response", "")
 
         if isinstance(raw_response, list) and raw_response:
             text_parts: List[str] = [
diff --git a/backend/apps/agents/session_store.py b/backend/apps/agents/session_store.py
index 56c868bb..12bb8168 100644
--- a/backend/apps/agents/session_store.py
+++ b/backend/apps/agents/session_store.py
@@ -7,33 +7,41 @@ The agents subapp calls these functions during close/resume/startup/shutdown.
 import json
 import os
 from typing import List, Tuple, Optional
+from backend.config.paths import DB_ROOT
+from typeguard import typechecked
 
-from backend.config.paths import SESSIONS_DIR
+SESSIONS_DIR = os.path.join(DB_ROOT, "sessions")
 
-def _path(session_id: str) -> str:
+@typechecked
+def p_path(session_id: str) -> str:
     return os.path.join(SESSIONS_DIR, f"{session_id}.json")
 
 
+@typechecked
 def save(session_id: str, data: dict) -> None:
     os.makedirs(SESSIONS_DIR, exist_ok=True)
-    with open(_path(session_id), "w") as f:
+    with open(p_path(session_id), "w") as f:
         json.dump(data, f, indent=2)
 
 
+@typechecked
 def load(session_id: str) -> Optional[dict]:
-    path = _path(session_id)
+    path: str = p_path(session_id)
     if not os.path.exists(path):
         return None
     with open(path) as f:
         return json.load(f)
 
 
+@typechecked
 def delete(session_id: str) -> None:
-    path = _path(session_id)
+    path: str = p_path(session_id)
     if os.path.exists(path):
         os.remove(path)
 
 
+# TODO: better type spec for the dict type
+@typechecked
 def load_all() -> List[Tuple[str, dict]]:
     results: List[Tuple[str, dict]] = []
     if not os.path.exists(SESSIONS_DIR):
@@ -48,6 +56,8 @@ def load_all() -> List[Tuple[str, dict]]:
     return results
 
 
+# TODO: better type spec for the whole damn thing
+@typechecked
 def build_search_text(agent_data: dict, max_len: int = 5000) -> str:
     parts = [agent_data.get("name", "")]
     for msg in agent_data.get("messages", {}).get("messages", []):
@@ -57,24 +67,25 @@ def build_search_text(agent_data: dict, max_len: int = 5000) -> str:
             parts.append(content)
     return " ".join(parts)[:max_len]
 
-
+# TODO: all the dict get guesswork shld be swapped to smthn less ambiguous/guessy
+@typechecked
 def get_history(
     q: str = "",
     limit: int = 20,
     offset: int = 0,
     dashboard_id: Optional[str] = None,
 ) -> dict:
-    all_data = load_all()
+    all_data: List[Tuple[str, dict]] = load_all()
     all_data.sort(key=lambda pair: pair[1].get("closed_at") or "", reverse=True)
 
-    q_lower = q.strip().lower()
+    q_lower: str = q.strip().lower()
     history: List[dict] = []
     for sid, data in all_data:
         if dashboard_id and data.get("dashboard_id") != dashboard_id:
             continue
         if q_lower:
-            name = (data.get("name") or "").lower()
-            search_text = (data.get("search_text") or "").lower()
+            name: str = (data.get("name") or "").lower()
+            search_text: str = (data.get("search_text") or "").lower()
             if q_lower not in name and q_lower not in search_text:
                 continue
         history.append({
@@ -89,11 +100,12 @@ def get_history(
             "dashboard_id": data.get("dashboard_id"),
         })
 
-    total = len(history)
-    page = history[offset : offset + limit]
+    total: int = len(history)
+    page: List[dict] = history[offset : offset + limit]
     return {"sessions": page, "total": total, "has_more": offset + limit < total}
 
 
+@typechecked
 async def reconcile_on_startup() -> None:
     for sid, data in load_all():
         if data.get("status") in ("running", "waiting_approval"):