diff --git a/apps/api/src/plugins/mcp/mcp_bridge.py b/apps/api/src/plugins/mcp/mcp_bridge.py
index c59a2d57..665d9e21 100644
--- a/apps/api/src/plugins/mcp/mcp_bridge.py
+++ b/apps/api/src/plugins/mcp/mcp_bridge.py
@@ -200,16 +200,21 @@ class MCPBridge:
         self._tool_cache: dict[str, list[MCPTool]] = {}
         self._http_client = httpx.AsyncClient(timeout=30.0)
 
-        # 註冊 Mock Servers (Phase 3: 先驗證介面)
-        self._register_mock_servers()
+        # 註冊 MCP Servers (Phase 13.2: 整合真實服務)
+        self._register_servers()
 
-    def _register_mock_servers(self) -> None:
-        """註冊 Mock MCP Servers (開發測試用)"""
+    def _register_servers(self) -> None:
+        """註冊 MCP Servers"""
         self._servers["kubernetes"] = MCPServer(
             name="kubernetes",
             transport=MCPTransport.HTTP,
             endpoint="http://localhost:8081/mcp",
         )
+        self._servers["signoz"] = MCPServer(
+            name="signoz",
+            transport=MCPTransport.HTTP,
+            endpoint="http://192.168.0.188:3301",  # SignOz Query Service
+        )
         self._servers["filesystem"] = MCPServer(
             name="filesystem",
             transport=MCPTransport.STDIO,
@@ -319,6 +324,47 @@ class MCPBridge:
                     server_name=server.name,
                 ),
             ],
+            "signoz": [
+                MCPTool(
+                    name="gold_metrics",
+                    description="Get Gold Metrics (RPS, Error Rate, P99 Latency) for a service",
+                    input_schema={
+                        "type": "object",
+                        "properties": {
+                            "service_name": {"type": "string", "description": "Service name (e.g., api-gateway)"},
+                            "namespace": {"type": "string", "description": "K8s namespace (default: awoooi-prod)"},
+                            "time_window_minutes": {"type": "integer", "description": "Time window in minutes (default: 10)"},
+                        },
+                        "required": ["service_name"],
+                    },
+                    server_name=server.name,
+                ),
+                MCPTool(
+                    name="trace_url",
+                    description="Generate SignOz trace URL for debugging a service",
+                    input_schema={
+                        "type": "object",
+                        "properties": {
+                            "service_name": {"type": "string", "description": "Service name"},
+                            "window_minutes": {"type": "integer", "description": "Time window ± minutes (default: 5)"},
+                        },
+                        "required": ["service_name"],
+                    },
+                    server_name=server.name,
+                ),
+                MCPTool(
+                    name="system_metrics",
+                    description="Get system metrics (CPU, Disk I/O) from SignOz",
+                    input_schema={
+                        "type": "object",
+                        "properties": {
+                            "host": {"type": "string", "description": "Host IP (default: 192.168.0.188)"},
+                            "time_window_minutes": {"type": "integer", "description": "Time window in minutes (default: 5)"},
+                        },
+                    },
+                    server_name=server.name,
+                ),
+            ],
             "database": [
                 MCPTool(
                     name="query",
@@ -568,6 +614,82 @@ class MCPBridge:
             else:
                 return {"error": f"Unknown kubernetes tool: {tool_name}"}
 
+        # =============================================
+        # SignOz: 監控指標查詢 (Phase 13.2 #79)
+        # =============================================
+        elif server.name == "signoz":
+            from src.services.signoz_client import get_signoz_client
+
+            signoz = get_signoz_client()
+
+            if tool_name == "gold_metrics":
+                # 取得 Gold Metrics (RPS, Error Rate, P99)
+                service_name = parameters.get("service_name", "")
+                if not service_name:
+                    return {"error": "Missing 'service_name' parameter"}
+
+                namespace = parameters.get("namespace", "awoooi-prod")
+                time_window = parameters.get("time_window_minutes", 10)
+
+                metrics = await signoz.get_gold_metrics(
+                    service_name=service_name,
+                    namespace=namespace,
+                    time_window_minutes=time_window,
+                )
+
+                return {
+                    "service_name": metrics.service_name,
+                    "namespace": metrics.namespace,
+                    "rps": round(metrics.rps, 2),
+                    "rps_trend": metrics.rps_trend,
+                    "error_rate": round(metrics.error_rate, 2),
+                    "error_count": metrics.error_count,
+                    "total_requests": metrics.total_requests,
+                    "p50_latency_ms": round(metrics.p50_latency_ms, 1),
+                    "p95_latency_ms": round(metrics.p95_latency_ms, 1),
+                    "p99_latency_ms": round(metrics.p99_latency_ms, 1),
+                    "latency_trend": metrics.latency_trend,
+                    "summary": metrics.to_summary(),
+                }
+
+            elif tool_name == "trace_url":
+                # 生成 SignOz Trace URL
+                service_name = parameters.get("service_name", "")
+                if not service_name:
+                    return {"error": "Missing 'service_name' parameter"}
+
+                window_minutes = parameters.get("window_minutes", 5)
+                url = signoz.generate_trace_url(
+                    service_name=service_name,
+                    window_minutes=window_minutes,
+                )
+
+                return {
+                    "service_name": service_name,
+                    "trace_url": url,
+                    "window_minutes": window_minutes,
+                }
+
+            elif tool_name == "system_metrics":
+                # 取得系統指標 (CPU/Disk)
+                host = parameters.get("host", "192.168.0.188")
+                time_window = parameters.get("time_window_minutes", 5)
+
+                metrics = await signoz.get_system_metrics(
+                    _host=host,
+                    time_window_minutes=time_window,
+                )
+
+                return {
+                    "host": host,
+                    "cpu": metrics.get("cpu", {}),
+                    "disk": metrics.get("disk", {}),
+                    "time_range": metrics.get("time_range", {}),
+                }
+
+            else:
+                return {"error": f"Unknown signoz tool: {tool_name}"}
+
         # =============================================
         # Database: 查詢 incident/approval 歷史 (Phase 13.2 #81)
         # =============================================