export interface SupervisionState {
    /** `process.ppid` captured at startup. */
    originalPpid: number;
    /** `process.ppid` right now. */
    currentPpid: number;
    /**
     * The MCP host pid threaded past an intermediate launcher
     * (`CODEGRAPH_HOST_PPID`), or null when unknown — e.g. the standalone bundle,
     * which pre-bakes `--liftoff-only` and so never runs the relaunch that sets it.
     */
    hostPpid: number | null;
    /** Liveness probe — `process.kill(pid, 0)` in production, stubbed in tests. */
    isAlive: (pid: number) => boolean;
    /**
     * Optional parent-pid probe for another process. Used to detect when a
     * relaunch shim has already been reparented away from the original host even
     * if the host pid still looks alive (for example, as a zombie waiting to be
     * reaped). Returns null when unavailable.
     */
    getParentPid?: (pid: number) => number | null;
    /** Defaults to `process.platform`. */
    platform?: NodeJS.Platform;
}
/**
 * Returns a human-readable reason string when the process has lost its
 * supervisor and should shut down, or null while it is still supervised.
 */
export declare function supervisionLostReason(state: SupervisionState): string | null;
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