- Config.ReadOnly disables insert/update/delete/annotation tools, reports only
select in list_tables/describe_table and tells the agent it cannot write
- Config.AllowFunctionCalls keeps function tools on a read-only server
- Config.AllowedFunctions limits list_functions/call_function to named
functions (empty allows all); others are reported as unknown
- reflect read-only mode in the usage guide and exported catalogue