The most persistent source of team dysfunction is not conflict, underperformance, or misaligned strategy — it is ambiguity. When communication boundaries are undefined, teams default to self-protection over collaboration, and leaders absorb the friction of every unresolved expectation. Clear boundaries do not create distance; they create structure — and structure is the precondition for both psychological safety and sustained performance. This book examines the full spectrum of communication boundaries in leadership: time boundaries that protect deep work and decision-making capacity; availability boundaries that define responsiveness expectations in hybrid and remote environments; escalation protocols that distinguish urgent from routine; and respect boundaries that model the professional conduct expected across every interaction. It explores the behavioral mechanics of assertive communication — the discipline of stating expectations directly, consistently, and without apology — as distinct from both passive accommodation and authoritative control. The book also addresses how leaders can build psychological safety around boundaries, encouraging teams to set their own limits without fear of judgment, thereby distributing the accountability structure that keeps high-performing teams coherent under pressure.