import type { AgentMessage } from "../../sdk/agent-core/index.js";
import { type CompactionPolicy } from "../../sdk/coding-agent/core/compaction/index.js";
import { type ExtensionAPI } from "../../sdk/coding-agent/index.js";
import type { Runtime } from "../runtime.js";
export declare const COMPACT_CONTEXT_TOOL_NAME = "compact_context";
export interface AutoPruneFrozen {
    /** Session identity used to invalidate the frozen cut after branch/session switches. */
    sessionId: string;
    /** Index into the provider message array for the first kept message. */
    cutIndex: number;
    /** Stable AgentMessage reference at `cutIndex`, used as an O(1) identity anchor. */
    anchor: AgentMessage;
    /** Deterministic DCP-lite summary generated at the original prune. */
    summary: string;
    /** Original tokensBefore for the frozen compaction summary message. */
    tokensBefore: number;
    /** Original compaction timestamp for the frozen compaction summary message. */
    timestamp: string;
    /** Keep-recent token budget that produced this cut (policy-change invalidation). */
    keepRecentTokensUsed: number;
    /** Token estimate of the kept tail at the moment the cut was frozen. */
    tailTokensAtFreeze: number;
}
/** Request-time DCP adapter for isolated loops: it borrows only pure policy helpers. */
export declare function buildIsolatedRequestTimePrunedMessages(currentMessages: AgentMessage[], policy?: CompactionPolicy, keepRecentTokens?: number): AgentMessage[];
export interface IsolatedRequestTimePruneResult {
    messages: AgentMessage[];
    frozen: AutoPruneFrozen | null;
}
/**
 * Stateful per-run variant of {@link buildIsolatedRequestTimePrunedMessages}.
 *
 * The subagent loop owns the returned `frozen` value across provider requests.
 * On the first prune we freeze the deterministic summary + cut, then reuse that
 * exact prefix until the kept-tail anchor reference changes or the tail grows
 * past the window-relative hysteresis budget.
 */
export declare function buildIsolatedRequestTimePrunedMessagesResult(currentMessages: AgentMessage[], policy?: CompactionPolicy, keepRecentTokens?: number, frozen?: AutoPruneFrozen | null, contextWindow?: number | null): IsolatedRequestTimePruneResult;
export declare function registerCompactContextTool(ext: ExtensionAPI, runtime: Runtime): void;
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