import type { string_book } from './string_book';
/**
 * Supported visibility states for persisted agents.
 *
 * @public exported from `@promptbook/core`
 */
export declare const AGENT_VISIBILITY_VALUES: readonly ["PRIVATE", "UNLISTED", "PUBLIC"];
/**
 * Canonical visibility union for agents.
 *
 * @public exported from `@promptbook/core`
 */
export type AgentVisibility = (typeof AGENT_VISIBILITY_VALUES)[number];
/**
 * Fallback visibility used when no valid value is configured.
 *
 * @public exported from `@promptbook/core`
 */
export declare const DEFAULT_AGENT_VISIBILITY: AgentVisibility;
/**
 * Returns `true` when the value is one of supported visibility states.
 *
 * @param value - Raw value to validate.
 * @returns Whether the value is a valid `AgentVisibility`.
 *
 * @public exported from `@promptbook/core`
 */
export declare function isAgentVisibility(value: unknown): value is AgentVisibility;
/**
 * Normalizes raw visibility text into a supported value.
 *
 * @param value - Raw visibility value.
 * @returns Normalized visibility, or `null` when invalid.
 *
 * @public exported from `@promptbook/core`
 */
export declare function normalizeAgentVisibility(value: unknown): AgentVisibility | null;
/**
 * Parses visibility from an unknown value with a safe fallback.
 *
 * @param value - Raw visibility value.
 * @param fallback - Fallback when the value is invalid.
 * @returns Parsed visibility.
 *
 * @public exported from `@promptbook/core`
 */
export declare function parseAgentVisibility(value: unknown, fallback?: AgentVisibility): AgentVisibility;
/**
 * Parses visibility and throws when the value is not supported.
 *
 * @param value - Raw visibility value.
 * @param sourceLabel - Human-readable source used in the error message.
 * @returns Parsed visibility.
 *
 * @public exported from `@promptbook/core`
 */
export declare function parseAgentVisibilityStrict(value: unknown, sourceLabel?: string): AgentVisibility;
/**
 * Extracts the last `META VISIBILITY` value from an agent source.
 *
 * @param agentSource - Raw book source.
 * @param options - Strict parsing options.
 * @returns Normalized visibility, or `null` when no commitment is present.
 *
 * @public exported from `@promptbook/core`
 */
export declare function parseAgentSourceVisibility(agentSource: string_book, options?: {
    readonly isStrict?: boolean;
}): AgentVisibility | null;
/**
 * Returns whether an agent should be listed publicly in anonymous views.
 *
 * @param visibility - Agent visibility to evaluate.
 * @returns `true` for publicly listed agents.
 *
 * @public exported from `@promptbook/core`
 */
export declare function isPublicAgentVisibility(visibility: AgentVisibility | null | undefined): boolean;
/**
 * Returns the next visibility in UI rotation order.
 *
 * @param visibility - Current visibility.
 * @returns Next visibility value.
 *
 * @public exported from `@promptbook/core`
 */
export declare function getNextAgentVisibility(visibility: AgentVisibility | null | undefined): AgentVisibility;
/**
 * Inserts or replaces the `META VISIBILITY` commitment in a book source.
 *
 * @param agentSource - Raw book source.
 * @param visibility - Visibility to persist.
 * @returns Source with exactly one normalized `META VISIBILITY` line.
 *
 * @public exported from `@promptbook/core`
 */
export declare function setAgentSourceVisibility(agentSource: string_book, visibility: AgentVisibility): string_book;