/**
 * Workflow builders — Pipeline, FanOut, Loop, Fallback.
 *
 * These wrap @google/adk's SequentialAgent, ParallelAgent, and LoopAgent.
 */
import { BuilderBase } from "../core/builder-base.js";
import type { StatePredicate } from "../core/types.js";
/**
 * Sequential pipeline: runs agents in order.
 *
 * Usage:
 *   const pipeline = new Pipeline("flow")
 *     .step(new Agent("a").instruct("Step 1").writes("result"))
 *     .step(new Agent("b").instruct("Step 2 using {result}"))
 *     .build();
 */
export declare class Pipeline extends BuilderBase {
    constructor(name: string);
    /** Append an agent (or builder) as the next step. */
    step(agent: BuilderBase | unknown): this;
    build(): unknown;
}
/**
 * Parallel fan-out: runs agents concurrently.
 *
 * Usage:
 *   const fanout = new FanOut("parallel")
 *     .branch(new Agent("web").instruct("Search web."))
 *     .branch(new Agent("papers").instruct("Search papers."))
 *     .build();
 */
export declare class FanOut extends BuilderBase {
    constructor(name: string);
    /** Add an agent (or builder) as a parallel branch. */
    branch(agent: BuilderBase | unknown): this;
    build(): unknown;
}
/**
 * Loop: repeats a workflow up to N times or until a predicate is satisfied.
 *
 * Usage:
 *   const loop = new Loop("refine")
 *     .step(new Agent("writer").instruct("Write."))
 *     .step(new Agent("critic").instruct("Critique."))
 *     .maxIterations(3)
 *     .build();
 */
export declare class Loop extends BuilderBase {
    constructor(name: string);
    /** Append an agent (or builder) as a step in the loop body. */
    step(agent: BuilderBase | unknown): this;
    /** Set maximum number of iterations. */
    maxIterations(n: number): this;
    /** Set a termination predicate: stop looping when predicate returns true. */
    until(predicate: StatePredicate): this;
    build(): unknown;
}
/**
 * Fallback chain: tries agents in order, first success wins.
 *
 * Usage:
 *   const fallback = new Fallback("resilient", [fastAgent, strongAgent]);
 */
export declare class Fallback extends BuilderBase {
    private _children;
    constructor(name: string, children?: BuilderBase[]);
    /** Add a fallback alternative. */
    attempt(agent: BuilderBase): this;
    protected _clone(): this;
    build(): unknown;
}
//# sourceMappingURL=workflow.d.ts.map