/**
 * Runs a single step to a validated output under its unified retry policy (spec §9), per-step budgets
 * (time + tokens, spec §9.3), and — for agent steps — in-session output steering (spec §9.2) and Q&A
 * suspension (spec §10). Pure w.r.t. the engine boundary: all agent/network coupling is behind
 * `host.startAgent`; all delay (backoff + budget timers) is `host.sleep`.
 */
import type { AgentStep, FunctionStep } from "../flow/types.ts";
import { type RunState, type StepOutcome } from "./context.ts";
import type { NodePath } from "./node-path.ts";
import type { HostPort } from "./types.ts";
/**
 * How an agent step's conversation begins: a `fresh` run builds the prompt from input+context; an
 * `answer` resume (spec §8.4) seeds the session with the blocked conversation and replays the user's
 * structured answers as the next turn. `elapsedMs`/`tokensUsed` (spec §9.4) are this attempt's budget
 * totals as of the block being answered — see `runAgentStep`'s carry-forward.
 */
export type AgentEntry = {
    kind: "fresh";
} | {
    kind: "answer";
    answers: Record<string, unknown>;
    conversation: readonly unknown[];
    elapsedMs?: number;
    tokensUsed?: number;
};
/** Run a function step under its retry + time budget (spec §9). Emits `step-retry`; the caller emits step lifecycle. */
export declare function runFunctionStep(step: FunctionStep, input: unknown, host: HostPort, state: RunState, signal: AbortSignal, parentPath: NodePath, path: string): Promise<StepOutcome>;
/**
 * Run an agent step under its retry policy (spec §9), budgets (time + tokens, §9.3), steering (§9.2),
 * and Q&A (§10). `entry` selects a fresh run or an answer-resume that continues the same loop (§8.4).
 * Emits `step-retry`/`agent-steer`; the caller emits step lifecycle + `questionnaire-asked`.
 */
export declare function runAgentStep(step: AgentStep, input: unknown, host: HostPort, state: RunState, signal: AbortSignal, parentPath: NodePath, path: string, entry: AgentEntry): Promise<StepOutcome>;
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