/**
 * RTK (Rust Token Killer) installer + PATH detection.
 *
 * RTK is a token-optimized shell command proxy. See
 * https://github.com/rtk-ai/rtk for details.
 *
 * This module:
 *   1. Detects whether `rtk` is on PATH.
 *   2. Optionally runs the upstream install script
 *      (`curl -fsSL <install.sh> | sh`) when missing.
 *   3. Provides a short instruction block that can be injected into
 *      agent sessions so they know to prefix shell commands with `rtk`.
 *
 * The installer runs at most once per process and is safe to call from
 * plugin init — it returns immediately if RTK is already present or if
 * auto-install is disabled. Network/subprocess failures are logged and
 * swallowed so a missing RTK never blocks startup.
 */
import type { Logger, RtkConfig } from '../types';
/** Short instruction snippet injected into agent sessions. */
export declare const RTK_INSTRUCTION_BLOCK = "# RTK - Rust Token Killer\n\n**Usage**: Token-optimized CLI proxy for shell commands.\n\n## Rule\n\nAlways prefix shell commands with `rtk`.\n\nExamples:\n\n```bash\nrtk git status\nrtk cargo test\nrtk npm run build\nrtk pytest -q\n```\n\n## Meta Commands\n\n```bash\nrtk gain            # Token savings analytics\nrtk gain --history  # Recent command savings history\nrtk proxy <cmd>     # Run raw command without filtering\n```\n\n## Verification\n\n```bash\nrtk --version\nrtk gain\nwhich rtk\n```\n";
/** Whether `rtk` binary is reachable on PATH. */
export declare function isRtkInstalled(): boolean;
/** Resolve final RTK config with defaults applied. */
export declare function resolveRtkConfig(config?: RtkConfig): Required<Pick<RtkConfig, 'enabled' | 'autoInstall' | 'installUrl'>>;
/**
 * Ensure RTK is available. If missing and auto-install is enabled, run
 * `curl -fsSL <url> | sh` in a detached child process. Never throws.
 *
 * Returns a promise that resolves with the final install state.
 */
export declare function ensureRtkInstalled(logger: Logger, config?: RtkConfig): Promise<{
    installed: boolean;
    skipped: boolean;
    reason?: string;
}>;
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