Add local tool filtering

.env.example

@@ -46,6 +46,15 @@ USE_NAMES_IN_PROMPT=true
 # Disable all built-in local tools and keep only MCP tools
 DISABLE_LOCAL_TOOLS=false
 
+# Filter built-in local tools by name.
+# LOCAL_TOOL_ALLOWLIST lets through only the listed tools.
+# LOCAL_TOOL_DENYLIST removes the listed tools.
+# Examples:
+# LOCAL_TOOL_ALLOWLIST=get_datetime,web_search
+# LOCAL_TOOL_DENYLIST=shell_execute,python_interpreter
+LOCAL_TOOL_ALLOWLIST=
+LOCAL_TOOL_DENYLIST=
+
 # Custom system prompt for AI (or put it into data/SYSTEM_PROMPT.md)
 SYSTEM_PROMPT=