import type { AgentPipelines } from '../core/agent-types.js';
import type { Context } from '../core/context.js';
import type { EventBus } from '../kernel/events.js';
import { type ContextWindowConfigLike } from '../types/context-window.js';
import { AutoCompactionMiddleware } from './auto-compaction-middleware.js';
/**
 * Install proactive auto-compaction into a subagent's context-window pipeline.
 *
 * Subagents (CLI fleet host, the light webui/SDD factory) build their pipelines
 * with `createDefaultPipelines()` and historically registered nothing on
 * `contextWindow`, so they had **no proactive compaction** — they grew until a
 * provider rejected the request and only then recovered reactively. This wires
 * the same rule-based `HybridCompactor` + `AutoCompactionMiddleware` the leader
 * uses, so a subagent shrinks on the warn/soft/hard thresholds (and gets the
 * last-resort emergency trim) exactly like the leader.
 *
 * No custom estimator is passed: the middleware's internal
 * `estimateRequestTokensCalibrated` default already applies per-(provider,model)
 * calibration, which is what a subagent wants. Returns the middleware (so the
 * caller could toggle it) or `undefined` when the provider window is unknown
 * (0), in which case compaction is skipped rather than guessing a denominator.
 */
export declare function installSubagentAutoCompaction(pipelines: AgentPipelines, ctx: Context, contextConfig: ContextWindowConfigLike | undefined, events?: EventBus | undefined): AutoCompactionMiddleware | undefined;
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