diff --git a/nanoclaude/services/backend_registry.py b/nanoclaude/services/backend_registry.py
index 7a2483e..ed3a36e 100644
--- a/nanoclaude/services/backend_registry.py
+++ b/nanoclaude/services/backend_registry.py
@@ -28,6 +28,11 @@ CLASSIFIER_PROMPT = """\
 - email.read(uid) — 메일 본문 조회
 - document.search(query) — 문서 검색
 - document.read(doc_id) — 문서 조회
+- infra.status(host) — 서버 Docker 컨테이너 상태. host: gpu (기본), nas-company
+- infra.health(service) — 서비스 헬스체크. service 생략 시 전체 체크. 개별: document-server, mlx, ollama-gpu
+- infra.disk(host) — 디스크 사용률. host 생략 시 gpu+macmini 전체
+- infra.network() — Tailscale 네트워크 연결 상태
+- infra.models(host) — 모델 목록. host: gpu (Ollama), mlx (맥미니 MLX)
 
 메일 전송은 불가능하다. 메일 보내달라는 요청은 거부하라.
 
@@ -47,6 +52,11 @@ JSON 형식:
 - "내일 3시 회의" → tools: calendar.create_draft(...)
 - "최근 메일" → tools: email.search("", 7)
 - "문서 찾아줘" → tools: document.search(...)
+- "GPU 서버 상태" → tools: infra.status("gpu")
+- "서비스 살아있어?" → tools: infra.health()
+- "디스크 용량" → tools: infra.disk()
+- "네트워크 상태" → tools: infra.network()
+- "모델 뭐 있어?" → tools: infra.models("gpu")
 - "안녕" → direct
 - "양자역학 설명해줘" → route
 
diff --git a/nanoclaude/tools/infra_tool.py b/nanoclaude/tools/infra_tool.py
new file mode 100644
index 0000000..33308a6
--- /dev/null
+++ b/nanoclaude/tools/infra_tool.py
@@ -0,0 +1,112 @@
+"""Infra tool — NanoClaude wrapper over infra.core/ functions.
+
+Converts infra.core results to NanoClaude tool return format:
+{"ok": bool, "tool": "infra", "operation": str, "data": list, "summary": str, "error": str}
+"""
+
+from __future__ import annotations
+
+import asyncio
+import logging
+
+from infra.core.docker import docker_status
+from infra.core.health import service_health, VALID_SERVICES
+from infra.core.system import disk_usage
+from infra.core.network import tailscale_status
+from infra.core.models import ollama_models, mlx_models
+
+logger = logging.getLogger(__name__)
+
+
+async def status(host: str = "gpu") -> dict:
+    """Docker container status overview."""
+    result = await docker_status(host)
+    if not result.ok:
+        return {"ok": False, "tool": "infra", "operation": "status",
+                "data": [], "summary": "", "error": result.error or "확인 실패"}
+
+    data = [{"name": c.name, "status": c.status, "uptime": c.uptime}
+            for c in result.containers]
+    return {"ok": True, "tool": "infra", "operation": "status",
+            "data": data, "summary": result.summary, "error": ""}
+
+
+async def health(service: str = "") -> dict:
+    """Service health check. If no service specified, check all critical ones."""
+    if service:
+        services = [service]
+    else:
+        services = ["document-server", "mlx", "ollama-gpu"]
+
+    results = []
+    all_ok = True
+    for svc in services:
+        r = await service_health(svc)
+        results.append({
+            "service": r.service, "status": r.status, "ok": r.ok,
+            "details": r.details,
+        })
+        if not r.ok:
+            all_ok = False
+
+    summary_parts = []
+    for r in results:
+        icon = "정상" if r["ok"] else "이상"
+        summary_parts.append(f"{r['service']}: {icon}")
+
+    return {"ok": all_ok, "tool": "infra", "operation": "health",
+            "data": results, "summary": ", ".join(summary_parts), "error": ""}
+
+
+async def disk(host: str = "") -> dict:
+    """Disk usage. If no host, check gpu + macmini."""
+    hosts = [host] if host else ["gpu", "macmini"]
+    all_data = []
+    warnings = []
+
+    for h in hosts:
+        result = await disk_usage(h)
+        if not result.ok:
+            warnings.append(f"{h}: {result.error}")
+            continue
+        for fs in result.filesystems:
+            all_data.append({"host": h, "mount": fs.mount,
+                             "used_pct": fs.used_pct, "used": fs.used, "total": fs.total})
+        warnings.extend(result.warnings)
+
+    summary = ", ".join(f"{d['host']}:{d['mount']} {d['used_pct']}%" for d in all_data[:5])
+    return {"ok": len(warnings) == 0, "tool": "infra", "operation": "disk",
+            "data": all_data, "summary": summary,
+            "error": "; ".join(warnings) if warnings else ""}
+
+
+async def network() -> dict:
+    """Tailscale network status."""
+    result = await tailscale_status()
+    if not result.ok:
+        return {"ok": False, "tool": "infra", "operation": "network",
+                "data": [], "summary": "", "error": result.error or "확인 실패"}
+
+    data = [{"hostname": p.hostname, "ip": p.ip, "status": p.status, "os": p.os}
+            for p in result.peers]
+    online = sum(1 for p in result.peers if p.status != "offline")
+    summary = f"{online}/{len(result.peers)} 온라인"
+    return {"ok": True, "tool": "infra", "operation": "network",
+            "data": data, "summary": summary, "error": ""}
+
+
+async def models(host: str = "gpu") -> dict:
+    """Model inventory."""
+    if host == "mlx" or host == "macmini":
+        result = await mlx_models()
+    else:
+        result = await ollama_models(host)
+
+    if not result.ok:
+        return {"ok": False, "tool": "infra", "operation": "models",
+                "data": [], "summary": "", "error": result.error or "확인 실패"}
+
+    data = [{"id": m.id, "size": m.size} for m in result.models]
+    summary = f"{result.source} on {result.host}: {len(result.models)}개 모델"
+    return {"ok": True, "tool": "infra", "operation": "models",
+            "data": data, "summary": summary, "error": ""}
diff --git a/nanoclaude/tools/registry.py b/nanoclaude/tools/registry.py
index f771af6..5a0a7b6 100644
--- a/nanoclaude/tools/registry.py
+++ b/nanoclaude/tools/registry.py
@@ -4,7 +4,7 @@ from __future__ import annotations
 
 import logging
 
-from tools import calendar_tool, document_tool, email_tool
+from tools import calendar_tool, document_tool, email_tool, infra_tool
 
 logger = logging.getLogger(__name__)
 
@@ -13,6 +13,7 @@ ERROR_MESSAGES = {
     "calendar": "⚠️ 캘린더 서비스를 사용할 수 없습니다. 잠시 후 다시 시도해주세요.",
     "email": "⚠️ 메일 서비스를 사용할 수 없습니다. 잠시 후 다시 시도해주세요.",
     "document": "⚠️ 문서 서비스를 사용할 수 없습니다. 잠시 후 다시 시도해주세요.",
+    "infra": "⚠️ 인프라 서비스를 확인할 수 없습니다. 잠시 후 다시 시도해주세요.",
 }
 
 # 허용된 operations
@@ -20,6 +21,7 @@ ALLOWED_OPS = {
     "calendar": {"today", "search", "create_draft", "create_confirmed"},
     "email": {"search", "read"},
     "document": {"search", "read"},
+    "infra": {"status", "health", "disk", "network", "models"},
 }
 
 # payload hard limit
@@ -43,6 +45,8 @@ async def execute_tool(tool_name: str, operation: str, params: dict) -> dict:
             result = await _exec_email(operation, params)
         elif tool_name == "document":
             result = await _exec_document(operation, params)
+        elif tool_name == "infra":
+            result = await _exec_infra(operation, params)
         else:
             result = _error(tool_name, operation, "미구현")
 
@@ -98,5 +102,19 @@ async def _exec_document(operation: str, params: dict) -> dict:
     return _error("document", operation, "미구현")
 
 
+async def _exec_infra(operation: str, params: dict) -> dict:
+    if operation == "status":
+        return await infra_tool.status(params.get("host", "gpu"))
+    elif operation == "health":
+        return await infra_tool.health(params.get("service", ""))
+    elif operation == "disk":
+        return await infra_tool.disk(params.get("host", ""))
+    elif operation == "network":
+        return await infra_tool.network()
+    elif operation == "models":
+        return await infra_tool.models(params.get("host", "gpu"))
+    return _error("infra", operation, "미구현")
+
+
 def _error(tool: str, operation: str, msg: str) -> dict:
     return {"ok": False, "tool": tool, "operation": operation, "data": [], "summary": "", "error": msg}