pub const EFFORT_LADDER: &'static [&'static str];Expand description
The reasoning-effort ladder, weakest first. Spans both harnesses’ own
vocabularies: Claude Code’s low|medium|high and Codex’s none…ultra
(cc§9, cx§6/§9). A level outside the ladder is not an error — it is
forwarded verbatim to the provider — but it cannot be RANKED, so an
effort cap can neither clamp it nor be fooled by it (see cap_effort).