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Node.js stdout to a pipe is buffered. Without periodic event loop activity, WS callback → server.notification() → stdout.write() may not flush until the next I/O event. A 1s setInterval (NOT unref'd) keeps the event loop ticking so notifications flush immediately. This is why claude-intercom worked: its 1s HTTP poll kept the event loop active as a side effect. Claudemesh's passive WS listener let the event loop settle, causing stdout to buffer indefinitely. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>