/**
 * Core type definitions for adk-fluent-ts.
 *
 * These types provide the foundation for type-safe builder composition.
 */
/**
 * Generic state bag used for inter-agent data flow.
 */
export type State = Record<string, unknown>;
/**
 * A predicate over agent state.
 */
export type StatePredicate = (state: State) => boolean;
/**
 * A state transform function.
 */
export type StateTransform = (state: State) => State;
/**
 * A callback function (before/after agent/model/tool).
 */
export type CallbackFn = (...args: any[]) => any;
/**
 * A tool function that can be registered with an agent.
 */
export type ToolFn = (...args: any[]) => any;
/**
 * Sentinel value for "not set" — distinct from undefined/null.
 */
declare const _UNSET_SYMBOL: unique symbol;
export type Unset = typeof _UNSET_SYMBOL;
export declare const UNSET: Unset;
/**
 * Configuration for an UntilSpec (conditional loop).
 */
export interface UntilSpec {
    predicate: StatePredicate;
    max: number;
}
/**
 * Create an until() spec for conditional loops.
 *
 * Usage: `agent.timesUntil(until(pred, 5))`
 * Or: `agent.timesUntil(pred, { max: 5 })`
 */
export declare function until(predicate: StatePredicate, max?: number): UntilSpec;
export {};
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