import { type SkillEntry } from '../../common';
/**
 * Best-effort `lastModified` resolver. Returns an ISO 8601 timestamp
 * string when the skill is file-backed and the file is reachable; returns
 * `undefined` otherwise (caller MUST treat absence as "unknown", not
 * "never modified").
 */
export declare function resolveLastModifiedForSkill(skill: SkillEntry): Promise<string | undefined>;
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