/**
 * Tool binary management — download and resolve fd and ripgrep binaries.
 *
 * On first use, checks for system-installed binaries in PATH. If missing,
 * downloads platform-specific release archives from GitHub into the agent's
 * bin directory. Supports macOS, Linux, Windows, and Termux (pkg install).
 * Respects SHORTCUT_OFFLINE to skip downloads in air-gapped environments.
 */
/**
 * Ensure a tool binary is available, downloading from GitHub if necessary.
 * Returns the resolved path to the binary, or undefined if unavailable.
 */
export declare function ensureTool(tool: 'fd' | 'rg', silent?: boolean): Promise<string | undefined>;
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