feat(ai_client): isolation of current_tier using threading.local() for parallel agent safety

src/ai_client.py

@@ -86,8 +86,16 @@ comms_log_callback: Optional[Callable[[dict[str, Any]], None]] = None
 # Injected by gui.py - called whenever a tool call completes.
 tool_log_callback: Optional[Callable[[str, str], None]] = None
 
-# Set by caller tiers before ai_client.send(); cleared in finally.
-current_tier: Optional[str] = None
+_local_storage = threading.local()
+
+def get_current_tier() -> Optional[str]:
+ """Returns the current tier from thread-local storage."""
+ return getattr(_local_storage, "current_tier", None)
+
+def set_current_tier(tier: Optional[str]) -> None:
+ """Sets the current tier in thread-local storage."""
+ _local_storage.current_tier = tier
+
 # Increased to allow thorough code exploration before forcing a summary
 MAX_TOOL_ROUNDS: int = 10
 
@@ -129,7 +137,6 @@ _comms_log: list[dict[str, Any]] = []
 COMMS_CLAMP_CHARS: int = 300
 
 def _append_comms(direction: str, kind: str, payload: dict[str, Any]) -> None:
- global current_tier
  entry: dict[str, Any] = {
   "ts":          datetime.datetime.now().strftime("%H:%M:%S"),
   "direction":   direction,
@@ -137,7 +144,7 @@ def _append_comms(direction: str, kind: str, payload: dict[str, Any]) -> None:
   "provider":    _provider,
   "model":       _model,
   "payload":     payload,
-  "source_tier": current_tier,
+  "source_tier": get_current_tier(),
  }
  _comms_log.append(entry)
  if comms_log_callback is not None:
@@ -1231,7 +1238,7 @@ def _send_anthropic(md_content: str, user_message: str, base_dir: str, file_item
      tool_executed = True
     
     if not tool_executed:
-     if name and name in mcp_client.TOOL_NAMES:
+     if b_name and b_name in mcp_client.TOOL_NAMES:
 
       _append_comms("OUT", "tool_call", {"name": b_name, "id": b_id, "args": b_input})
       if b_name in mcp_client.MUTATING_TOOLS and pre_tool_callback: