/**
 * Whether `url` is something we are willing to hand to the desktop.
 *
 * Exported for the same reason it exists: the check has to be identical
 * everywhere, and a second hand-written copy of it is how an allowlist stops
 * being one.
 */
export declare function isOpenableUrl(url: string): boolean;
/**
 * Open a URL in the desktop's default handler.
 *
 * No shell, anywhere. The URL comes from a line of the transcript, which is
 * text a model wrote, and `exec("open " + url)` hands that to `sh` — a URL with
 * a quote and a semicolon in it would be a command. Every platform gets the
 * argument as an argument. Windows is the awkward one: `start` is a `cmd`
 * builtin rather than a program, and its first quoted argument is the window
 * title, which is why the empty string is there.
 *
 * Detached and with stdio ignored: the handler is a GUI program that outlives
 * this process, and a live pipe to it would hold the TUI's terminal.
 */
export declare function openUrl(url: string): void;
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