import type { Response, Prompt } from "effect/unstable/ai";
import type { PendingToolResult } from "./agent-tool-result.js";
/** @internal Mutable state owned by one Agent.stream invocation. */
export interface AgentRunState {
    turn: number;
    text: string;
    readonly pending: Map<number, PendingToolResult>;
    finish: {
        readonly usage: Response.Usage;
        readonly reason: Response.FinishReason;
    } | undefined;
    usage: Response.Usage | undefined;
    currentContext: Prompt.Prompt | undefined;
    currentContextTokens: number | undefined;
    reportedContextUsage: {
        readonly prompt: Prompt.Prompt;
        readonly estimatedTokens: number;
        readonly reportedTokens: number;
    } | undefined;
    providerOutput: {
        textCharacters: number;
        reasoningCharacters: number;
        finishReason: Response.FinishReason | undefined;
    };
}
export declare const makeProviderOutputState: () => AgentRunState["providerOutput"];
/** @internal A checkpoint of the state consumed by a model-turn continuation. */
export interface AgentRunCheckpoint {
    readonly turn: number;
    readonly prompt: Prompt.Prompt;
    readonly pending: ReadonlyArray<PendingToolResult>;
    readonly completed: boolean;
}