/**
 * Listen-port env so nested CLI agents can detect sidecar (no TTY).
 * startSidecar() stamps SIDECAR_PORT while a sidecar is active (including
 * default 9100, programmatic options.port, and ephemeral 0). close() restores
 * the inherited value so later default binds and Cursor MCP gating do not leak.
 */
export declare function resolveSidecarListenPort(optionsPort?: number, env?: NodeJS.ProcessEnv): number;
/**
 * Stamp SIDECAR_PORT so Cursor --approve-mcps sidecar detection cannot miss.
 * Returns a disposer that restores the inherited value when this sidecar (and
 * any concurrent ones sharing the env) have closed.
 */
export declare function ensureSidecarPortEnv(port: number, env?: NodeJS.ProcessEnv): () => void;