Struct Probes 

pub struct Probes<'a> {
    pub env_set: &'a dyn Fn(&str) -> bool,
    pub exists: &'a dyn Fn(&Path) -> bool,
    pub keychain_has_claude: &'a dyn Fn() -> bool,
}

Injected IO, so statuses_with is a pure function of config plus these answers. Tests pass closures over a fixture and never touch a real $HOME, environment variable, or Keychain.

Fields

env_set: &'a dyn Fn(&str) -> bool

Whether an environment variable is set to a non-empty value.

exists: &'a dyn Fn(&Path) -> bool

Whether a path exists.

keychain_has_claude: &'a dyn Fn() -> bool

Whether the macOS login Keychain holds Claude Code’s OAuth blob. Always false off macOS; a subprocess (security(1)) when it is consulted, which is why it is injected and asked only once Claude’s credential file has already been ruled out.