Function name 

pub fn name(language: &str) -> &str

The language an agent is told to write in, by name.

[graph] language takes a code or a name, and a code reached the prompt verbatim: “Write all prose in ja” is an instruction a model can read as noise, and the questions agents asked came back in English on a repository configured for Japanese. Naming the language is the whole fix. The same name is what a CLI’s own response-language setting expects.