import type { SkillDiscoveryMode } from './types.js';
export declare const SKILL_DISCOVERY_ENV = "KIOKUKO_SKILL_DISCOVERY";
export declare const MAX_BEARER_TOKEN_CHARS = 4096;
/** RFC 6750 b64token characters, bounded to keep header construction predictable. */
export declare function isBearerToken(value: unknown): value is string;
/** Authenticated registry traffic is never sent to a configurable or local origin. */
export declare function isTrustedSkillsShApiUrl(value: string): boolean;
/** Parse only positive delta-seconds or canonical IMF-fixdate HTTP dates. */
export declare function parseRetryAfterSeconds(value: string | null, now?: number): number | null;
export declare function isSkillDiscoveryMode(value: unknown): value is SkillDiscoveryMode;
export declare function normalizeSkillDiscoveryMode(value: unknown): SkillDiscoveryMode;
export interface SkillDiscoveryConfig {
    mode: SkillDiscoveryMode;
    apiUrl: string;
    v1Token: string | null;
    githubToken: string | null;
}
export declare function readSkillDiscoveryConfig(env?: NodeJS.ProcessEnv): SkillDiscoveryConfig;
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