/** The skill ships from the branch the build was cut from: a `-staging` build installs `tree/staging`, a plain release installs `tree/main`. */
export declare const relaySkillSourceBranch: (version?: string) => "staging" | "main";
export declare const relaySkillInstallArgs: (version?: string) => readonly string[];
export declare const RELAY_SKILL_INSTALL_ARGS: readonly string[];
export declare function relaySkillPresent(cwd: string, home: string, env?: NodeJS.ProcessEnv): Promise<boolean | "unknown">;
export declare function installerEnvironment(parent: NodeJS.ProcessEnv): NodeJS.ProcessEnv;
export declare function resolveNpx(env: NodeJS.ProcessEnv, platform?: NodeJS.Platform): Promise<string>;
/** `--global --yes --agent <name>…`: the same installer, told where to go, for
 * `--install-skills`, where nobody is there to answer its questions. */
export declare const relaySkillGlobalArgs: (targets: readonly string[], version?: string) => readonly string[];
/**
 * `headless`: nobody is watching a terminal, or stdout is spoken for by
 * `--json`. The vendored installer then runs with NO_COLOR=1 (no-color.org:
 * "when present and not an empty string ... prevents the addition of ANSI
 * color") and everything it prints goes to stderr, so a pipe never sees its
 * banner, its 15 escapes or its spinner (ledger rows P12, P15, P17; captures/
 * relay/is5.out and is.out). Its own non-interactive flags come in `args`.
 */
export declare function installRelaySkill(cwd: string, env: NodeJS.ProcessEnv, args?: readonly string[], headless?: boolean): Promise<void>;
export declare const plainInstallerOutput: (text: string) => string;
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