pub trait HelpMetadata {
// Required methods
fn metadata(&self) -> &ModelMetadata;
fn full_name(&self) -> String;
// Provided methods
fn name(&self) -> &str { ... }
fn file_path(&self) -> String { ... }
fn containing_dir(&self) -> String { ... }
fn exec_path(&self) -> String { ... }
fn description(&self) -> String { ... }
}