Additional empty list case for available_tools

Author: Ben Appleby

python/copilot/client.py

@@ -630,11 +630,11 @@ async def resume_session(
 
         # Add available/excluded tools if provided
         available_tools = cfg.get("available_tools")
-        if available_tools:
+        if available_tools is not None:
             payload["availableTools"] = available_tools
 
         excluded_tools = cfg.get("excluded_tools")
-        if excluded_tools:
+        if excluded_tools is not None:
             payload["excludedTools"] = excluded_tools
 
         provider = cfg.get("provider")