Kastell

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server_secure

Idempotent

Apply SSH hardening, fail2ban, UFW firewall, and custom domain management. Run security audits with scoring to identify vulnerabilities.

Instructions

Secure Kastell servers. Secure: 'secure-setup' applies SSH hardening + fail2ban, 'secure-audit' runs security audit with score. Firewall: 'firewall-setup' installs UFW with Coolify ports, 'firewall-add'/'firewall-remove' manage port rules, 'firewall-status' shows current rules. Domain: 'domain-set'/'domain-remove' manage custom domain with optional SSL, 'domain-check' verifies DNS, 'domain-info' shows current FQDN. All require SSH access to server. For full one-shot hardening (SSH + fail2ban + UFW + sysctl + unattended-upgrades), use server_lock instead.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`ssl`	No	Enable SSL (https) for domain. Default: true.
`port`	No	Port number. Required for firewall-add/remove. Optional SSH port for secure-setup.
`action`	Yes	Action: Secure: 'secure-setup' hardens SSH + installs fail2ban, 'secure-audit' runs security audit with score. Firewall: 'firewall-setup' installs UFW, 'firewall-add'/'firewall-remove' manage port rules, 'firewall-status' shows rules. Domain: 'domain-set'/'domain-remove' manage FQDN, 'domain-check' verifies DNS, 'domain-info' shows current FQDN.
`domain`	No	Domain name. Required for domain-set and domain-check.
`server`	No	Server name or IP. Auto-selected if only one server exists.
`protocol`	No	Protocol for firewall rules. Default: tcp.	tcp

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.

Changed2 schema fields changedv2.3.0Jun 15, 2026

changedInput schema / properties / action / enum

Previous value: -[
-  "secure-setup",
-  "secure-audit",
-  "firewall-setup",
-  "firewall-add",
-  "firewall-remove",
-  "firewall-status",
-  "domain-set",
-  "domain-remove",
-  "domain-check",
-  "domain-info"
-]New value: +[
+  "audit",
+  "secure-setup",
+  "secure-audit",
+  "firewall-setup",
+  "firewall-add",
+  "firewall-remove",
+  "firewall-status",
+  "domain-set",
+  "domain-remove",
+  "domain-check",
+  "domain-info"
+]

changedOutput schema / properties / result / oneOf

Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "action": {
-        "const": "secure-setup",
-        "type": "string"
-      },
-      "fail2ban": {
-        "type": "boolean"
-      },
-      "hint": {
-        "type": "string"
-      },
-      "ip": {
-        "type": "string"
-      },
-      "message": {
-        "type": "string"
-      },
-      "server": {
-        "type": "string"
-      },
-      "sshHardening": {
-        "type": "boolean"
-      },
-      "sshKeyCount": {
-        "type": "number"
-      },
-      "success": {
-        "type": "boolean"
-      },
-      "suggested_actions": {
-        "items": {
-          "additionalProperties": false,
-          "properties": {
-            "command": {
-              "type": "string"
-            },
-            "reason": {
-              "type": "string"
-            }
-          },
-          "required": [
-            "command",
-            "reason"
-          ],
-          "type": "object"
-        },
-        "type": "array"
-      }
-    },
-    "required": [
-      "action",
-      "success",
-      "server",
-      "ip",
-      "message",
-      "sshHardening",
-      "fail2ban",
-      "sshKeyCount",
-      "suggested_actions"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "action": {
-        "const": "secure-audit",
-        "type": "string"
-      },
-      "checks": {
-        "additionalProperties": false,
-        "properties": {
-          "fail2ban": {
-            "type": "boolean"
-          },
-          "passwordAuth": {
-            "type": "boolean"
-          },
-          "rootLogin": {
-            "type": "boolean"
-          },
-          "sshPort": {
-            "type": "boolean"
-          }
-        },
-        "required": [
-          "passwordAuth",
-          "rootLogin",
-          "fail2ban",
-          "sshPort"
-        ],
-        "type": "object"
-      },
-      "ip": {
-        "type": "string"
-      },
-      "maxScore": {
-        "type": "number"
-      },
-      "score": {
-        "type": "number"
-      },
-      "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",
-      "score",
-      "maxScore",
-      "checks",
-      "suggested_actions"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "action": {
-        "const": "firewall-setup",
-        "type": "string"
-      },
-      "ip": {
-        "type": "string"
-      },
-      "message": {
-        "type": "string"
-      },
-      "server": {
-        "type": "string"
-      },
-      "success": {
-        "type": "boolean"
-      },
-      "suggested_actions": {
-        "items": {
-          "additionalProperties": false,
-          "properties": {
-            "command": {
-              "type": "string"
-            },
-            "reason": {
-              "type": "string"
-            }
-          },
-          "required": [
-            "command",
-            "reason"
-          ],
-          "type": "object"
-        },
-        "type": "array"
-      }
-    },
-    "required": [
-      "action",
-      "success",
-      "server",
-      "ip",
-      "message",
-      "suggested_actions"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "action": {
-        "const": "firewall-add",
-        "type": "string"
-      },
-      "ip": {
-        "type": "string"
-      },
-      "message": {
-        "type": "string"
-      },
-      "server": {
-        "type": "string"
-      },
-      "success": {
-        "type": "boolean"
-      },
-      "suggested_actions": {
-        "items": {
-          "additionalProperties": false,
-          "properties": {
-            "command": {
-              "type": "string"
-            },
-            "reason": {
-              "type": "string"
-            }
-          },
-          "required": [
-            "command",
-            "reason"
-          ],
-          "type": "object"
-        },
-        "type": "array"
-      }
-    },
-    "required": [
-      "action",
-      "success",
-      "server",
-      "ip",
-      "message",
-      "suggested_actions"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "action": {
-        "const": "firewall-remove",
-        "type": "string"
-      },
-      "ip": {
-        "type": "string"
-      },
-      "message": {
-        "type": "string"
-      },
-      "server": {
-        "type": "string"
-      },
-      "success": {
-        "type": "boolean"
-      },
-      "suggested_actions": {
-        "items": {
-          "additionalProperties": false,
-          "properties": {
-            "command": {
-              "type": "string"
-            },
-            "reason": {
-              "type": "string"
-            }
-          },
-          "required": [
-            "command",
-            "reason"
-          ],
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "warning": {
-        "type": "string"
-      }
-    },
-    "required": [
-      "action",
-      "success",
-      "server",
-      "ip",
-      "message",
-      "suggested_actions"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "action": {
-        "const": "firewall-status",
-        "type": "string"
-      },
-      "active": {
-        "type": "boolean"
-      },
-      "ip": {
-        "type": "string"
-      },
-      "ruleCount": {
-        "type": "number"
-      },
-      "rules": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "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",
-      "active",
-      "rules",
-      "ruleCount",
-      "suggested_actions"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "action": {
-        "const": "domain-set",
-        "type": "string"
-      },
-      "ip": {
-        "type": "string"
-      },
-      "message": {
-        "type": "string"
-      },
-      "server": {
-        "type": "string"
-      },
-      "success": {
-        "type": "boolean"
-      },
-      "suggested_actions": {
-        "items": {
-          "additionalProperties": false,
-          "properties": {
-            "command": {
-              "type": "string"
-            },
-            "reason": {
-              "type": "string"
-            }
-          },
-          "required": [
-            "command",
-            "reason"
-          ],
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "url": {
-        "type": "string"
-      }
-    },
-    "required": [
-      "action",
-      "success",
-      "server",
-      "ip",
-      "message",
-      "url",
-      "suggested_actions"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "action": {
-        "const": "domain-remove",
-        "type": "string"
-      },
-      "ip": {
-        "type": "string"
-      },
-      "message": {
-        "type": "string"
-      },
-      "server": {
-        "type": "string"
-      },
-      "success": {
-        "type": "boolean"
-      },
-      "suggested_actions": {
-        "items": {
-          "additionalProperties": false,
-          "properties": {
-            "command": {
-              "type": "string"
-            },
-            "reason": {
-              "type": "string"
-            }
-          },
-          "required": [
-            "command",
-            "reason"
-          ],
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "url": {
-        "type": "string"
-      }
-    },
-    "required": [
-      "action",
-      "success",
-      "server",
-      "ip",
-      "message",
-      "url",
-      "suggested_actions"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "action": {
-        "const": "domain-check",
-        "type": "string"
-      },
-      "domain": {
-        "type": "string"
-      },
-      "hint": {
-        "type": "string"
-      },
-      "ip": {
-        "type": "string"
-      },
-      "match": {
-        "type": "boolean"
-      },
-      "resolvedIp": {
-        "type": "string"
-      },
-      "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",
-      "domain",
-      "resolvedIp",
-      "match",
-      "suggested_actions"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "action": {
-        "const": "domain-info",
-        "type": "string"
-      },
-      "fqdn": {
-        "anyOf": [
-          {
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "ip": {
-        "type": "string"
-      },
-      "message": {
-        "type": "string"
-      },
-      "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",
-      "fqdn",
-      "message",
-      "suggested_actions"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "action": {
+        "const": "secure-setup",
+        "type": "string"
+      },
+      "fail2ban": {
+        "type": "boolean"
+      },
+      "hint": {
+        "type": "string"
+      },
+      "ip": {
+        "type": "string"
+      },
+      "message": {
+        "type": "string"
+      },
+      "server": {
+        "type": "string"
+      },
+      "sshHardening": {
+        "type": "boolean"
+      },
+      "sshKeyCount": {
+        "type": "number"
+      },
+      "success": {
+        "type": "boolean"
+      },
+      "suggested_actions": {
+        "items": {
+          "additionalProperties": false,
+          "properties": {
+            "command": {
+              "type": "string"
+            },
+            "reason": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "command",
+            "reason"
+          ],
+          "type": "object"
+        },
+        "type": "array"
+      }
+    },
+    "required": [
+      "action",
+      "success",
+      "server",
+      "ip",
+      "message",
+      "sshHardening",
+      "fail2ban",
+      "sshKeyCount",
+      "suggested_actions"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "action": {
+        "const": "audit",
+        "type": "string"
+      },
+      "checks": {
+        "additionalProperties": false,
+        "properties": {
+          "fail2ban": {
+            "type": "boolean"
+          },
+          "passwordAuth": {
+            "type": "boolean"
+          },
+          "rootLogin": {
+            "type": "boolean"
+          },
+          "sshPort": {
+            "type": "boolean"
+          }
+        },
+        "required": [
+          "passwordAuth",
+          "rootLogin",
+          "fail2ban",
+          "sshPort"
+        ],
+        "type": "object"
+      },
+      "ip": {
+        "type": "string"
+      },
+      "maxScore": {
+        "type": "number"
+      },
+      "score": {
+        "type": "number"
+      },
+      "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",
+      "score",
+      "maxScore",
+      "checks",
+      "suggested_actions"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "action": {
+        "const": "secure-audit",
+        "type": "string"
+      },
+      "checks": {
+        "additionalProperties": false,
+        "properties": {
+          "fail2ban": {
+            "type": "boolean"
+          },
+          "passwordAuth": {
+            "type": "boolean"
+          },
+          "rootLogin": {
+            "type": "boolean"
+          },
+          "sshPort": {
+            "type": "boolean"
+          }
+        },
+        "required": [
+          "passwordAuth",
+          "rootLogin",
+          "fail2ban",
+          "sshPort"
+        ],
+        "type": "object"
+      },
+      "ip": {
+        "type": "string"
+      },
+      "maxScore": {
+        "type": "number"
+      },
+      "score": {
+        "type": "number"
+      },
+      "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",
+      "score",
+      "maxScore",
+      "checks",
+      "suggested_actions"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "action": {
+        "const": "firewall-setup",
+        "type": "string"
+      },
+      "ip": {
+        "type": "string"
+      },
+      "message": {
+        "type": "string"
+      },
+      "server": {
+        "type": "string"
+      },
+      "success": {
+        "type": "boolean"
+      },
+      "suggested_actions": {
+        "items": {
+          "additionalProperties": false,
+          "properties": {
+            "command": {
+              "type": "string"
+            },
+            "reason": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "command",
+            "reason"
+          ],
+          "type": "object"
+        },
+        "type": "array"
+      }
+    },
+    "required": [
+      "action",
+      "success",
+      "server",
+      "ip",
+      "message",
+      "suggested_actions"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "action": {
+        "const": "firewall-add",
+        "type": "string"
+      },
+      "ip": {
+        "type": "string"
+      },
+      "message": {
+        "type": "string"
+      },
+      "server": {
+        "type": "string"
+      },
+      "success": {
+        "type": "boolean"
+      },
+      "suggested_actions": {
+        "items": {
+          "additionalProperties": false,
+          "properties": {
+            "command": {
+              "type": "string"
+            },
+            "reason": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "command",
+            "reason"
+          ],
+          "type": "object"
+        },
+        "type": "array"
+      }
+    },
+    "required": [
+      "action",
+      "success",
+      "server",
+      "ip",
+      "message",
+      "suggested_actions"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "action": {
+        "const": "firewall-remove",
+        "type": "string"
+      },
+      "ip": {
+        "type": "string"
+      },
+      "message": {
+        "type": "string"
+      },
+      "server": {
+        "type": "string"
+      },
+      "success": {
+        "type": "boolean"
+      },
+      "suggested_actions": {
+        "items": {
+          "additionalProperties": false,
+          "properties": {
+            "command": {
+              "type": "string"
+            },
+            "reason": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "command",
+            "reason"
+          ],
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "warning": {
+        "type": "string"
+      }
+    },
+    "required": [
+      "action",
+      "success",
+      "server",
+      "ip",
+      "message",
+      "suggested_actions"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "action": {
+        "const": "firewall-status",
+        "type": "string"
+      },
+      "active": {
+        "type": "boolean"
+      },
+      "ip": {
+        "type": "string"
+      },
+      "ruleCount": {
+        "type": "number"
+      },
+      "rules": {
+        "items": {
+          "additionalProperties": false,
+          "properties": {
+            "action": {
+              "type": "string"
+            },
+            "from": {
+              "type": "string"
+            },
+            "port": {
+              "type": "string"
+            },
+            "proto": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "port",
+            "proto",
+            "action",
+            "from"
+          ],
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "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",
+      "active",
+      "rules",
+      "ruleCount",
+      "suggested_actions"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "action": {
+        "const": "domain-set",
+        "type": "string"
+      },
+      "ip": {
+        "type": "string"
+      },
+      "message": {
+        "type": "string"
+      },
+      "server": {
+        "type": "string"
+      },
+      "success": {
+        "type": "boolean"
+      },
+      "suggested_actions": {
+        "items": {
+          "additionalProperties": false,
+          "properties": {
+            "command": {
+              "type": "string"
+            },
+            "reason": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "command",
+            "reason"
+          ],
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "url": {
+        "type": "string"
+      }
+    },
+    "required": [
+      "action",
+      "success",
+      "server",
+      "ip",
+      "message",
+      "url",
+      "suggested_actions"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "action": {
+        "const": "domain-remove",
+        "type": "string"
+      },
+      "ip": {
+        "type": "string"
+      },
+      "message": {
+        "type": "string"
+      },
+      "server": {
+        "type": "string"
+      },
+      "success": {
+        "type": "boolean"
+      },
+      "suggested_actions": {
+        "items": {
+          "additionalProperties": false,
+          "properties": {
+            "command": {
+              "type": "string"
+            },
+            "reason": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "command",
+            "reason"
+          ],
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "url": {
+        "type": "string"
+      }
+    },
+    "required": [
+      "action",
+      "success",
+      "server",
+      "ip",
+      "message",
+      "url",
+      "suggested_actions"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "action": {
+        "const": "domain-check",
+        "type": "string"
+      },
+      "domain": {
+        "type": "string"
+      },
+      "hint": {
+        "type": "string"
+      },
+      "ip": {
+        "type": "string"
+      },
+      "match": {
+        "type": "boolean"
+      },
+      "resolvedIp": {
+        "type": "string"
+      },
+      "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",
+      "domain",
+      "resolvedIp",
+      "match",
+      "suggested_actions"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "action": {
+        "const": "domain-info",
+        "type": "string"
+      },
+      "fqdn": {
+        "anyOf": [
+          {
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "ip": {
+        "type": "string"
+      },
+      "message": {
+        "type": "string"
+      },
+      "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",
+      "fqdn",
+      "message",
+      "suggested_actions"
+    ],
+    "type": "object"
+  }
+]

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": "secure-setup",
+              "type": "string"
+            },
+            "fail2ban": {
+              "type": "boolean"
+            },
+            "hint": {
+              "type": "string"
+            },
+            "ip": {
+              "type": "string"
+            },
+            "message": {
+              "type": "string"
+            },
+            "server": {
+              "type": "string"
+            },
+            "sshHardening": {
+              "type": "boolean"
+            },
+            "sshKeyCount": {
+              "type": "number"
+            },
+            "success": {
+              "type": "boolean"
+            },
+            "suggested_actions": {
+              "items": {
+                "additionalProperties": false,
+                "properties": {
+                  "command": {
+                    "type": "string"
+                  },
+                  "reason": {
+                    "type": "string"
+                  }
+                },
+                "required": [
+                  "command",
+                  "reason"
+                ],
+                "type": "object"
+              },
+              "type": "array"
+            }
+          },
+          "required": [
+            "action",
+            "success",
+            "server",
+            "ip",
+            "message",
+            "sshHardening",
+            "fail2ban",
+            "sshKeyCount",
+            "suggested_actions"
+          ],
+          "type": "object"
+        },
+        {
+          "additionalProperties": false,
+          "properties": {
+            "action": {
+              "const": "secure-audit",
+              "type": "string"
+            },
+            "checks": {
+              "additionalProperties": false,
+              "properties": {
+                "fail2ban": {
+                  "type": "boolean"
+                },
+                "passwordAuth": {
+                  "type": "boolean"
+                },
+                "rootLogin": {
+                  "type": "boolean"
+                },
+                "sshPort": {
+                  "type": "boolean"
+                }
+              },
+              "required": [
+                "passwordAuth",
+                "rootLogin",
+                "fail2ban",
+                "sshPort"
+              ],
+              "type": "object"
+            },
+            "ip": {
+              "type": "string"
+            },
+            "maxScore": {
+              "type": "number"
+            },
+            "score": {
+              "type": "number"
+            },
+            "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",
+            "score",
+            "maxScore",
+            "checks",
+            "suggested_actions"
+          ],
+          "type": "object"
+        },
+        {
+          "additionalProperties": false,
+          "properties": {
+            "action": {
+              "const": "firewall-setup",
+              "type": "string"
+            },
+            "ip": {
+              "type": "string"
+            },
+            "message": {
+              "type": "string"
+            },
+            "server": {
+              "type": "string"
+            },
+            "success": {
+              "type": "boolean"
+            },
+            "suggested_actions": {
+              "items": {
+                "additionalProperties": false,
+                "properties": {
+                  "command": {
+                    "type": "string"
+                  },
+                  "reason": {
+                    "type": "string"
+                  }
+                },
+                "required": [
+                  "command",
+                  "reason"
+                ],
+                "type": "object"
+              },
+              "type": "array"
+            }
+          },
+          "required": [
+            "action",
+            "success",
+            "server",
+            "ip",
+            "message",
+            "suggested_actions"
+          ],
+          "type": "object"
+        },
+        {
+          "additionalProperties": false,
+          "properties": {
+            "action": {
+              "const": "firewall-add",
+              "type": "string"
+            },
+            "ip": {
+              "type": "string"
+            },
+            "message": {
+              "type": "string"
+            },
+            "server": {
+              "type": "string"
+            },
+            "success": {
+              "type": "boolean"
+            },
+            "suggested_actions": {
+              "items": {
+                "additionalProperties": false,
+                "properties": {
+                  "command": {
+                    "type": "string"
+                  },
+                  "reason": {
+                    "type": "string"
+                  }
+                },
+                "required": [
+                  "command",
+                  "reason"
+                ],
+                "type": "object"
+              },
+              "type": "array"
+            }
+          },
+          "required": [
+            "action",
+            "success",
+            "server",
+            "ip",
+            "message",
+            "suggested_actions"
+          ],
+          "type": "object"
+        },
+        {
+          "additionalProperties": false,
+          "properties": {
+            "action": {
+              "const": "firewall-remove",
+              "type": "string"
+            },
+            "ip": {
+              "type": "string"
+            },
+            "message": {
+              "type": "string"
+            },
+            "server": {
+              "type": "string"
+            },
+            "success": {
+              "type": "boolean"
+            },
+            "suggested_actions": {
+              "items": {
+                "additionalProperties": false,
+                "properties": {
+                  "command": {
+                    "type": "string"
+                  },
+                  "reason": {
+                    "type": "string"
+                  }
+                },
+                "required": [
+                  "command",
+                  "reason"
+                ],
+                "type": "object"
+              },
+              "type": "array"
+            },
+            "warning": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "action",
+            "success",
+            "server",
+            "ip",
+            "message",
+            "suggested_actions"
+          ],
+          "type": "object"
+        },
+        {
+          "additionalProperties": false,
+          "properties": {
+            "action": {
+              "const": "firewall-status",
+              "type": "string"
+            },
+            "active": {
+              "type": "boolean"
+            },
+            "ip": {
+              "type": "string"
+            },
+            "ruleCount": {
+              "type": "number"
+            },
+            "rules": {
+              "items": {
+                "type": "string"
+              },
+              "type": "array"
+            },
+            "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",
+            "active",
+            "rules",
+            "ruleCount",
+            "suggested_actions"
+          ],
+          "type": "object"
+        },
+        {
+          "additionalProperties": false,
+          "properties": {
+            "action": {
+              "const": "domain-set",
+              "type": "string"
+            },
+            "ip": {
+              "type": "string"
+            },
+            "message": {
+              "type": "string"
+            },
+            "server": {
+              "type": "string"
+            },
+            "success": {
+              "type": "boolean"
+            },
+            "suggested_actions": {
+              "items": {
+                "additionalProperties": false,
+                "properties": {
+                  "command": {
+                    "type": "string"
+                  },
+                  "reason": {
+                    "type": "string"
+                  }
+                },
+                "required": [
+                  "command",
+                  "reason"
+                ],
+                "type": "object"
+              },
+              "type": "array"
+            },
+            "url": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "action",
+            "success",
+            "server",
+            "ip",
+            "message",
+            "url",
+            "suggested_actions"
+          ],
+          "type": "object"
+        },
+        {
+          "additionalProperties": false,
+          "properties": {
+            "action": {
+              "const": "domain-remove",
+              "type": "string"
+            },
+            "ip": {
+              "type": "string"
+            },
+            "message": {
+              "type": "string"
+            },
+            "server": {
+              "type": "string"
+            },
+            "success": {
+              "type": "boolean"
+            },
+            "suggested_actions": {
+              "items": {
+                "additionalProperties": false,
+                "properties": {
+                  "command": {
+                    "type": "string"
+                  },
+                  "reason": {
+                    "type": "string"
+                  }
+                },
+                "required": [
+                  "command",
+                  "reason"
+                ],
+                "type": "object"
+              },
+              "type": "array"
+            },
+            "url": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "action",
+            "success",
+            "server",
+            "ip",
+            "message",
+            "url",
+            "suggested_actions"
+          ],
+          "type": "object"
+        },
+        {
+          "additionalProperties": false,
+          "properties": {
+            "action": {
+              "const": "domain-check",
+              "type": "string"
+            },
+            "domain": {
+              "type": "string"
+            },
+            "hint": {
+              "type": "string"
+            },
+            "ip": {
+              "type": "string"
+            },
+            "match": {
+              "type": "boolean"
+            },
+            "resolvedIp": {
+              "type": "string"
+            },
+            "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",
+            "domain",
+            "resolvedIp",
+            "match",
+            "suggested_actions"
+          ],
+          "type": "object"
+        },
+        {
+          "additionalProperties": false,
+          "properties": {
+            "action": {
+              "const": "domain-info",
+              "type": "string"
+            },
+            "fqdn": {
+              "anyOf": [
+                {
+                  "type": "string"
+                },
+                {
+                  "type": "null"
+                }
+              ]
+            },
+            "ip": {
+              "type": "string"
+            },
+            "message": {
+              "type": "string"
+            },
+            "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",
+            "fqdn",
+            "message",
+            "suggested_actions"
+          ],
+          "type": "object"
+        }
+      ]
+    }
+  },
+  "required": [
+    "result"
+  ],
+  "type": "object"
+}

First observedv1.14.0Mar 25, 2026

TDQS

A4.5/5.0

Behavior4/5

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

Annotations already indicate idempotent and non-destructive behavior. The description adds that SSH access is required, which is critical operational context. It does not disclose any potential side effects beyond what is implied, but the annotations carry much of the burden.

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?

The description is efficient, covering all key actions in a single paragraph without redundancy. It is front-loaded with the primary verb. A more structured layout (e.g., lists) could improve scannability, but current form is adequate.

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

Completeness4/5

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

The description provides a comprehensive overview of available actions and prerequisites. With an output schema present, return value details are not needed. It covers operational constraints (SSH access) and alternatives, making it complete for the tool's complexity.

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?

Schema coverage is 100%, so parameters are well documented. The description adds context beyond the schema, such as 'Auto-selected if only one server exists' for server and 'Optional SSH port for secure-setup' for port, improving clarity.

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?

The description clearly states the tool secures Kastell servers and breaks down actions into categories (secure, firewall, domain). It distinguishes from siblings by referencing server_lock for full one-shot hardening, making the purpose specific and unambiguous.

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

Usage Guidelines5/5

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

The description explicitly states that all actions require SSH access and recommends using server_lock for full hardening, providing both when-to-use and when-not-to-use guidance. This helps the agent choose correctly.

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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