/**
 * Accept-by-default gate for plan-implement research compaction.
 *
 * Prefer keeping a good free-form model summary. Reject only clear structural
 * failures (empty summary, orphan tool pairs, catastrophic stub) — never on
 * missing headings, missing hostnames, or token-% taste checks.
 */
import type { ChatMessage } from "../types.js";
/** Summary body shorter than this after a large history is treated as a stub. */
export declare const CATASTROPHIC_SUMMARY_MIN_CHARS = 120;
/**
 * Only apply catastrophic-stub check when pre-compact history was at least
 * this many estimated tokens (small sessions may legitimately shrink a lot).
 */
export declare const CATASTROPHIC_BEFORE_TOKENS_MIN = 8000;
/** After-tokens ratio below this vs large before + tiny body → reject. */
export declare const CATASTROPHIC_AFTER_RATIO = 0.05;
export interface AcceptPlanImplementCompactionInput {
    readonly summarized: boolean;
    /** Memory body without the COMPACTION_MEMORY_PREFIX header (or full text). */
    readonly summaryBody: string;
    readonly beforeTokens: number;
    readonly afterTokens: number;
    readonly afterMessages: readonly ChatMessage[];
}
export type AcceptPlanImplementCompactionResult = {
    readonly accept: true;
} | {
    readonly accept: false;
    readonly reason: string;
};
/**
 * Accept unless a clear structural failure is proven.
 * Does not inspect plan.goal keywords or markdown section headings.
 */
export declare function acceptPlanImplementCompaction(input: AcceptPlanImplementCompactionInput): AcceptPlanImplementCompactionResult;
/** Extract summary body from compacted messages for the accept gate. */
export declare function extractCompactionSummaryBody(messages: readonly ChatMessage[]): string;
/** Skip compact when history is already small (no toast). */
export declare const PLAN_IMPLEMENT_COMPACT_MIN_TOKENS = 6000;