Kastell

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Overview Schema Related Servers Score Discussions

server_logs

Read-onlyIdempotent

Fetch server logs and system metrics from Kastell-managed servers. Use 'logs' to retrieve recent lines from container, Docker, or system journal; 'monitor' for CPU, RAM, and disk usage.

Instructions

Fetch logs and system metrics from Kastell-managed servers via SSH. Actions: 'logs' retrieves recent log lines from Coolify container (Coolify servers only), Docker service, or system journal. Bare servers: use service 'system' or 'docker' (coolify service not available). 'monitor' fetches CPU, RAM, and disk usage metrics (works for all server modes). Requires SSH access to target server (root@ip). Note: live streaming (--follow) is not available via MCP — use the CLI for live log tailing.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`lines`	No	Number of log lines to fetch (only for 'logs' action, default: 50, max: 500)
`action`	Yes	Action: 'logs' fetch recent log lines, 'monitor' fetch CPU/RAM/Disk metrics
`server`	No	Server name or IP. Auto-selected if only one server exists.
`service`	No	Log source (only for 'logs' action): 'coolify' container (Coolify servers only), 'docker' service journal, 'system' full journal	coolify
`containers`	No	Include Docker container list in metrics (only for 'monitor' action)

Output Schema

TableJSON Schema

Name	Required	Description	Default
`result`	Yes

Schema Changelog

Changes observed during successful MCP inspections. Dates show when Glama detected each change.

Changed1 schema field changedv2.2.4May 7, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "additionalProperties": false,
+  "properties": {
+    "result": {
+      "oneOf": [
+        {
+          "additionalProperties": false,
+          "properties": {
+            "action": {
+              "const": "logs",
+              "type": "string"
+            },
+            "ip": {
+              "type": "string"
+            },
+            "lines": {
+              "type": "number"
+            },
+            "logs": {
+              "type": "string"
+            },
+            "server": {
+              "type": "string"
+            },
+            "service": {
+              "type": "string"
+            },
+            "suggested_actions": {
+              "items": {
+                "additionalProperties": false,
+                "properties": {
+                  "command": {
+                    "type": "string"
+                  },
+                  "reason": {
+                    "type": "string"
+                  }
+                },
+                "required": [
+                  "command",
+                  "reason"
+                ],
+                "type": "object"
+              },
+              "type": "array"
+            }
+          },
+          "required": [
+            "action",
+            "server",
+            "ip",
+            "service",
+            "lines",
+            "logs",
+            "suggested_actions"
+          ],
+          "type": "object"
+        },
+        {
+          "additionalProperties": false,
+          "properties": {
+            "action": {
+              "const": "monitor",
+              "type": "string"
+            },
+            "containers": {
+              "items": {
+                "additionalProperties": false,
+                "properties": {
+                  "id": {
+                    "type": "string"
+                  },
+                  "name": {
+                    "type": "string"
+                  },
+                  "status": {
+                    "type": "string"
+                  }
+                },
+                "required": [
+                  "id",
+                  "name",
+                  "status"
+                ],
+                "type": "object"
+              },
+              "type": "array"
+            },
+            "ip": {
+              "type": "string"
+            },
+            "metrics": {
+              "additionalProperties": false,
+              "properties": {
+                "cpu": {
+                  "additionalProperties": false,
+                  "properties": {
+                    "percent": {
+                      "type": "number"
+                    }
+                  },
+                  "required": [
+                    "percent"
+                  ],
+                  "type": "object"
+                },
+                "disk": {
+                  "additionalProperties": false,
+                  "properties": {
+                    "percent": {
+                      "type": "number"
+                    },
+                    "total": {
+                      "type": "number"
+                    },
+                    "used": {
+                      "type": "number"
+                    }
+                  },
+                  "required": [
+                    "percent",
+                    "total",
+                    "used"
+                  ],
+                  "type": "object"
+                },
+                "mem": {
+                  "additionalProperties": false,
+                  "properties": {
+                    "percent": {
+                      "type": "number"
+                    },
+                    "total": {
+                      "type": "number"
+                    },
+                    "used": {
+                      "type": "number"
+                    }
+                  },
+                  "required": [
+                    "percent",
+                    "total",
+                    "used"
+                  ],
+                  "type": "object"
+                }
+              },
+              "required": [
+                "cpu",
+                "mem",
+                "disk"
+              ],
+              "type": "object"
+            },
+            "server": {
+              "type": "string"
+            },
+            "suggested_actions": {
+              "items": {
+                "additionalProperties": false,
+                "properties": {
+                  "command": {
+                    "type": "string"
+                  },
+                  "reason": {
+                    "type": "string"
+                  }
+                },
+                "required": [
+                  "command",
+                  "reason"
+                ],
+                "type": "object"
+              },
+              "type": "array"
+            }
+          },
+          "required": [
+            "action",
+            "server",
+            "ip",
+            "metrics",
+            "suggested_actions"
+          ],
+          "type": "object"
+        }
+      ]
+    }
+  },
+  "required": [
+    "result"
+  ],
+  "type": "object"
+}

First observedv1.14.0Mar 25, 2026

TDQS

A4.4/5.0

Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations indicate read-only, idempotent, non-destructive. Description adds requirements (SSH access), limitation (no follow), and clarifies actions. No contradiction.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Description is well-structured with front-loaded purpose. Each sentence provides distinct info. Slightly verbose but appropriate for the complexity of actions and server modes.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Covers all parameter defaults (lines 50, containers false), actions, server types, and limitations. Output schema is present, so return values are documented elsewhere. Comprehensive for a log/metrics tool.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

All 5 parameters are described in schema (100% coverage). Description adds context: 'coolify' service only for Coolify servers, 'containers' only for monitor action. Adds value beyond schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

Description clearly states it fetches logs and system metrics from Kastell-managed servers via SSH, with specific actions 'logs' and 'monitor'. It distinguishes between Coolify and bare servers, and has no sibling overlap for logs/metrics.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Provides guidance on when to use 'logs' vs 'monitor', notes live streaming not available via MCP, and explains service options for different server types. Lacks explicit mention of when not to use this tool vs alternatives, but siblings are distinct.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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