import type { AgentSystem } from "../types.js";
import type { ChatSystemMessage } from "../../chat/types.js";
import type { ProviderModelMessage } from "../../chat/types.js";
import type { Message as AgentMessage } from "../schemas/index.js";
/** Public API contract for hosted child fork runtime step system resolver. */
export type HostedChildForkRuntimeStepSystemResolver = (input: {
    /** Flattened system text retained for compatibility with existing resolvers. */
    system: string;
    /** Structured system messages when provider metadata is available. */
    structuredSystem?: readonly ChatSystemMessage[];
    compactedMessages: readonly ProviderModelMessage[];
}) => AgentSystem | null | undefined;
/** Input payload for prepare hosted child fork runtime step messages. */
export type PrepareHostedChildForkRuntimeStepMessagesInput = {
    messages: AgentMessage[];
    buildInstructions: () => AgentSystem;
    forkToolNames: readonly string[];
    /** Provider-options key used by the child model runtime. */
    providerOptionKey?: string;
    resolveSystem?: HostedChildForkRuntimeStepSystemResolver;
    /**
     * Tool names that are always present. Required when `getActivatedToolNames`
     * is supplied.
     *
     * @deprecated No framework path supplies this. Retained because
     * `PrepareHostedChildForkRuntimeStepMessagesInput` is public API.
     */
    pinnedToolNames?: readonly string[];
    /**
     * Returns the currently activated tool names. The result is merged with
     * `pinnedToolNames` and returned as `forkToolNames`, letting a caller refresh
     * the exposed tool set per step without mutating its own fixed array.
     *
     * @deprecated Use `tool_search` deferred loading. See
     * `docs/architecture/28-model-driven-tool-discovery.md`.
     */
    getActivatedToolNames?: () => readonly string[];
};
/** Public API contract for hosted child fork runtime step messages. */
export type HostedChildForkRuntimeStepMessages = {
    messages: AgentMessage[];
    system: AgentSystem;
    /**
     * The live `pinned + activated` set for this step. Present only when
     * `getActivatedToolNames` was supplied; callers otherwise keep their own
     * fixed `forkToolNames`.
     */
    forkToolNames?: readonly string[];
};
/** Clone structured child instructions before exposing them to a resolver. */
export declare function cloneHostedChildForkRuntimeStepSystem(system: ChatSystemMessage[], providerOptionKey: string | undefined, proxyDetectionAvailable?: boolean): ChatSystemMessage[];
/** Convert compacted provider messages to child fork runtime messages. */
export declare function convertCompactedProviderMessagesToChildForkRuntimeMessages(compactedMessages: readonly ProviderModelMessage[]): AgentMessage[];
/** Prepare hosted child fork runtime step messages. */
export declare function prepareHostedChildForkRuntimeStepMessages(input: PrepareHostedChildForkRuntimeStepMessagesInput): HostedChildForkRuntimeStepMessages;
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