export type SkillSourceFailureCode = 'source_missing' | 'source_rate_limited' | 'source_unavailable' | 'candidate_not_found_at_source' | 'source_tree_truncated' | 'skill_disabled_for_model_invocation' | 'skill_secret_detected' | 'skill_too_large' | 'skill_validation_failed' | 'skill_blocked';
/** A bounded, externally safe failure produced by source retrieval or validation. */
export declare class SkillSourceError extends Error {
    readonly code: SkillSourceFailureCode;
    readonly retryAfterSeconds: number | null;
    constructor(code: SkillSourceFailureCode, retryAfterSeconds?: number | null);
}
export declare function skillSourceFailure(code: SkillSourceFailureCode): never;
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