type FetchImpl = (input: string, init?: RequestInit) => Promise<Response>;
export declare const DEFAULT_SKILL_SOURCE_URL = "https://raw.githubusercontent.com/timothyjordan/a14y/main/skills/a14y/SKILL.md";
/**
 * Source URL, overridable with `A14Y_SKILL_SOURCE_URL`. The override makes the
 * binary integration-testable (point it at a local server) and lets advanced
 * users install from a fork or branch.
 */
export declare function skillSourceUrl(): string;
export declare class SkillFetchError extends Error {
    readonly cause?: unknown | undefined;
    constructor(message: string, cause?: unknown | undefined);
}
export interface FetchSkillOptions {
    fetchImpl?: FetchImpl;
    /** Override the source URL (defaults to {@link skillSourceUrl}). */
    url?: string;
    /** Request timeout. Default 10s. */
    timeoutMs?: number;
}
/**
 * Download the raw SKILL.md body. Throws {@link SkillFetchError} on a non-2xx
 * response (including 404), a network/DNS failure, a timeout, or an empty body.
 */
export declare function fetchSkill(opts?: FetchSkillOptions): Promise<string>;
export {};