error[E0624]: method `register_tool` is private
  --> tests/ui/tool_server_handle_register_tool.rs:27:20
   |
27 |     let _ = handle.register_tool(def);
   |                    ^^^^^^^^^^^^^ private method
   |
  ::: src/tool_server.rs
   |
   |     pub(crate) fn register_tool(&self, factory: EngineToolDefinition) {
   |     ----------------------------------------------------------------- private method defined here