import type { ChatCompletionMessageParam, ChatCompletionMessageFunctionToolCall } from 'openai/resources/chat';
import type { ChatCompletionContentPart } from 'openai/resources/chat';
export type ChatCompletionToolCallExtraContent = {
    google?: {
        thought_signature?: string;
    };
} & Record<string, unknown>;
export type ChatCompletionToolCallWithExtraContent = ChatCompletionMessageFunctionToolCall & {
    extra_content?: ChatCompletionToolCallExtraContent;
};
interface ChatStateEntry {
    instructions: string | undefined;
    storageId: string | undefined;
    messages: ChatCompletionMessageParam[];
}
export declare class CompletionsChatState {
    private chats;
    createChat(chatId: string, instructions?: string, storageId?: string, history?: ChatCompletionMessageParam[]): void;
    getChat(chatId: string): ChatStateEntry | null;
    appendUserMessage(chatId: string, content: ChatCompletionContentPart[]): void;
    appendAssistantMessage(chatId: string, content: string): void;
    appendToolCallMessages(chatId: string, toolCalls: ChatCompletionToolCallWithExtraContent[], reasoningContent?: string, content?: string): void;
    appendToolResult(chatId: string, toolCallId: string, content: string): void;
    getMessages(chatId: string): ChatCompletionMessageParam[];
    /**
     * Replaces every recorded thought_signature in the chat's assistant
     * tool-call turns with the given marker. Recovery path for providers that
     * reject a previously-issued signature on replay ("Corrupted thought
     * signature"): downgrading to the documented validator-bypass marker lets
     * the conversation continue without the rejected signatures.
     */
    replaceThoughtSignatures(chatId: string, marker: string): void;
    deleteChat(chatId: string): void;
}
export {};