/**
 * LLM summarization for compaction.
 *
 * Prompts and helpers for generating conversation summaries via the LLM.
 */
import type { AgentMessage, StreamFn, ThinkingLevel } from "../../../agent-core/index.js";
import type { Model } from "../../../ai/index.js";
/**
 * Generate a summary of the conversation using the LLM.
 * If previousSummary is provided, uses the update prompt to merge.
 *
 * @deprecated The active coding-agent session path uses deterministic DCP-lite
 * (`compactDcpLite`) plus `session_before_compact` hook details. This legacy
 * LLM summarizer remains exported for compatibility with older callers only.
 */
export declare function generateSummary(currentMessages: AgentMessage[], model: Model<any>, reserveTokens: number, apiKey: string | undefined, headers?: Record<string, string>, signal?: AbortSignal, customInstructions?: string, previousSummary?: string, thinkingLevel?: ThinkingLevel, streamFn?: StreamFn): Promise<string>;
/**
 * Generate a summary for a turn prefix (when splitting a turn).
 */
export declare function generateTurnPrefixSummary(messages: AgentMessage[], model: Model<any>, reserveTokens: number, apiKey: string | undefined, headers?: Record<string, string>, signal?: AbortSignal, thinkingLevel?: ThinkingLevel, streamFn?: StreamFn): Promise<string>;
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