import type { ExtensionAPI, ExtensionContext } from "../../sdk/coding-agent/index.js";
import { type CompactionPolicy } from "../../sdk/coding-agent/core/compaction/index.js";
import type { Runtime } from "../runtime.js";
/**
 * Resolve the active model's context window. Prefers the live usage report,
 * falls back to the model definition; returns undefined when unknown.
 */
export declare function getContextWindow(ctx: Pick<ExtensionContext, "getContextUsage" | "model">): number | null | undefined;
/**
 * Effective post-run compaction threshold: the configured/policy floor, capped
 * at AUTO_COMPACTION_WINDOW_RATIO × the model context window when the window
 * is known. An unknown window (0/undefined, e.g. synthetic/proxy models) keeps
 * the uncapped formula.
 */
export declare function getPostRunCompactionThresholdTokens(runtime: Runtime, policy: CompactionPolicy, contextWindow?: number | null): number;
export declare function registerCompactionTrigger(ext: ExtensionAPI, runtime: Runtime): void;
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