/**
 * Structural shape of the `Error` a runtime returns when a caller asked for a
 * neutral feature it cannot serve. Callers branch on `name` and `feature`
 * rather than `instanceof`, so the shape crosses a package edge without a
 * shared class, and it is declared beside the constructor and the predicate
 * that are its only producer and reader.
 */
export interface UnsupportedAgentRuntimeFeatureError extends Error {
    name: 'UnsupportedAgentRuntimeFeatureError';
    feature: string;
}
export declare function unsupportedFeatureError(feature: string, message: string): UnsupportedAgentRuntimeFeatureError;
export declare function isUnsupportedFeatureError(error: unknown, feature?: string): error is UnsupportedAgentRuntimeFeatureError;
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