Method installPpidWatchdog

src/mcp/index.ts:454–473

* PPID watchdog (#277) — direct mode only. Daemon mode is detached on purpose * and reaps via idle timeout; proxy mode installs its own watchdog inside * runProxy. So this only ever runs for an in-process direct session.

()

   * {@link runProxy}. So this only ever runs for an in-process direct session.
   */
  private installPpidWatchdog(): void {
    if (this.mode !== 'direct') return;
    const pollMs = parsePpidPollMs(process.env.CODEGRAPH_PPID_POLL_MS);
    if (pollMs <= 0) return;
    this.ppidWatchdog = setInterval(() => {
      const reason = supervisionLostReason({
        originalPpid: this.originalPpid,
        currentPpid: process.ppid,
        hostPpid: this.hostPpid,
        isAlive: isProcessAlive,
      });
      if (reason) {
        process.stderr.write(
          `[CodeGraph MCP] Parent process exited (${reason}); shutting down.\n`
        );
        this.stop();
      }
    }, pollMs);
    this.ppidWatchdog.unref();
  }
}

function sleep(ms: number): Promise<void> {