import type { ChatActor, ChatMessage, ChatScope, ChatThread } from "./types/chat.js";
import type { ModelMessage } from "./types/model-config.js";
export declare const DEFAULT_CHAT_CONTEXT_TOKEN_BUDGET = 4096;
export declare const DEFAULT_CHAT_CONTEXT_THRESHOLD_RATIO = 0.8;
export declare const DEFAULT_CHAT_CONTEXT_RECENT_MESSAGES = 6;
export declare const DEFAULT_CHAT_CONTEXT_SUMMARY_CHARS = 1200;
export interface ChatContextAssemblyInput {
    scope: ChatScope;
    thread: ChatThread;
    messages: ChatMessage[];
    requestId: string;
    actor: ChatActor;
    tokenBudget?: number;
    thresholdTokens?: number;
    recentMessageCount?: number;
    maxSummaryChars?: number;
}
export interface ChatContextCompactionMeta {
    estimatedTokens: number;
    tokenBudget: number;
    thresholdTokens: number;
    compacted: boolean;
    omittedMessageCount: number;
    retainedMessageIds: string[];
    marker?: string;
}
export interface ChatContextAssembly {
    providerMessages: ModelMessage[];
    meta: ChatContextCompactionMeta;
}
export declare function assembleChatContext(input: ChatContextAssemblyInput): ChatContextAssembly;
export declare function estimateModelMessages(messages: ModelMessage[]): number;