/**
 * What a model id may be spelled with.
 *
 * An id is compared verbatim against what an engine's CLI accepts, so there is no
 * useful universal rule about its shape — antigravity serves `Gemini 3.5 Flash
 * (Medium)`, spaces and parentheses included. What there IS a rule about is the
 * characters no id has and a MANGLED one carries: `agy models` began printing
 * `id<TAB>label`, the parser kept the whole line, and that composite was handed to
 * `--model` and written into config as if it were an id.
 *
 * A control character is the tell. Nothing else here can separate a good id from a
 * bad one without asking the CLI, and by then the turn has already failed.
 */
/** Whether a string can be a model id at all: nonempty, and no control character. */
export declare function isSpellableModelId(value: string): boolean;
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