import type { SeoSignature } from "./types.js";
export declare class SeoPlaybookIndex {
    private readonly skillsRoot;
    private cache;
    constructor(skillsRoot?: string);
    /**
     * Parses every `skills/bober.seo-*` skill's `SKILL.md` file once and
     * memoises the flat signature list. Idempotent — a second call returns the SAME array
     * instance without re-reading the filesystem. Never throws: a missing
     * skills directory, or any individual unreadable/unparseable SKILL.md,
     * degrades to [] for that source rather than rejecting.
     */
    load(): Promise<SeoSignature[]>;
    /** The full memoised list, or [] before load() has been called. Never throws. */
    all(): SeoSignature[];
    /** Every signature authored in the generic skill — the retriever's always-included floor. */
    generic(): SeoSignature[];
}
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