import type { HookHostKind } from "../core/host-profile.js";
export interface HostCapabilities {
    /**
     * Pi >= 0.84 rewrites tool arguments by mutating `event.input` in place
     * (documented on `ToolCallEventResult`); OMP >= 18 returns the revision as
     * the `tool_call` result's `input` field.
     */
    readonly toolArgsRewrite: boolean;
    /** OMP >= 18 accepts `deliverAs: "aside"` on its message APIs. */
    readonly asideDelivery: boolean;
}
/** Resolve the active host SDK version, or undefined when it cannot be read. */
export declare function resolveHostSdkVersion(kind: HookHostKind): string | undefined;
/** Numeric-semver comparison; prerelease tags compare equal to their release. */
export declare function compareVersionStrings(left: string, right: string): number;
/**
 * Derive the capability set for a host. `sdkVersion` defaults to the version
 * resolved from the installed package; an unknown version yields no
 * capabilities so the extension never claims an API the host may lack.
 */
export declare function detectHostCapabilities(kind: HookHostKind, sdkVersion?: string | undefined): HostCapabilities;
/** Test seam: drop the memoized SDK version lookups. */
export declare function __resetHostCapabilitiesCacheForTests(): void;