Kastell

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server_provision

Destructive

Provision a cloud server with automatic Coolify or Dokploy installation, or a bare generic VPS. Requires provider API token; creates a billable resource.

Instructions

Provision a new server on a cloud provider. Default: Coolify auto-install via cloud-init. Pass mode:'bare' for a generic VPS without Coolify (installs UFW and runs system updates only). Requires provider API token as environment variable (HETZNER_TOKEN, DIGITALOCEAN_TOKEN, VULTR_TOKEN, LINODE_TOKEN). WARNING: Creates a billable cloud resource. Blocked when KASTELL_SAFE_MODE=true. Server takes 3-5 minutes to fully initialize after provisioning.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`mode`	No	Server mode: 'coolify' installs Coolify, 'dokploy' installs Dokploy, 'bare' provisions generic VPS. Default: coolify	coolify
`name`	No	Server hostname, 3-63 chars, lowercase, starts with letter, only alphanumeric and hyphens, ends with letter or number. If omitted and client supports elicitation, a form will be shown.
`size`	No	Server type/plan ID (e.g. 'cax11' for Hetzner, 's-2vcpu-2gb' for DigitalOcean). Uses template defaults if omitted
`region`	No	Region/location ID (e.g. 'nbg1' for Hetzner, 'fra1' for DigitalOcean, 'ewr' for Vultr, 'us-east' for Linode). Uses template defaults if omitted
`provider`	No	Cloud provider to create server on. If omitted and client supports elicitation, a form will be shown.
`template`	No	Template for default region/size. 'starter' = cheapest, 'production' = more resources, 'dev' = development. Explicit region/size override template defaults. Default: starter	starter

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.

Changed5 schema fields changedv2.3.1Jun 30, 2026

removedOutput schema / properties / result / additionalProperties
```
Removed value: -false
```

addedOutput schema / properties / result / oneOf

Added value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "hint": {
+        "type": "string"
+      },
+      "kind": {
+        "const": "created-persisted",
+        "type": "string"
+      },
+      "message": {
+        "type": "string"
+      },
+      "readiness": {
+        "additionalProperties": false,
+        "properties": {
+          "message": {
+            "type": "string"
+          },
+          "status": {
+            "enum": [
+              "pending",
+              "ready",
+              "unknown"
+            ],
+            "type": "string"
+          }
+        },
+        "required": [
+          "status"
+        ],
+        "type": "object"
+      },
+      "replacedStaleServer": {
+        "additionalProperties": false,
+        "properties": {
+          "createdAt": {
+            "type": "string"
+          },
+          "id": {
+            "type": "string"
+          },
+          "ip": {
+            "type": "string"
+          },
+          "mode": {
+            "type": "string"
+          },
+          "name": {
+            "type": "string"
+          },
+          "provider": {
+            "type": "string"
+          },
+          "region": {
+            "type": "string"
+          },
+          "size": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "id",
+          "name",
+          "provider",
+          "ip",
+          "region",
+          "size",
+          "mode",
+          "createdAt"
+        ],
+        "type": "object"
+      },
+      "server": {
+        "additionalProperties": false,
+        "properties": {
+          "createdAt": {
+            "type": "string"
+          },
+          "id": {
+            "type": "string"
+          },
+          "ip": {
+            "type": "string"
+          },
+          "mode": {
+            "type": "string"
+          },
+          "name": {
+            "type": "string"
+          },
+          "provider": {
+            "type": "string"
+          },
+          "region": {
+            "type": "string"
+          },
+          "size": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "id",
+          "name",
+          "provider",
+          "ip",
+          "region",
+          "size",
+          "mode",
+          "createdAt"
+        ],
+        "type": "object"
+      },
+      "success": {
+        "type": "boolean"
+      },
+      "suggested_actions": {
+        "items": {
+          "additionalProperties": false,
+          "properties": {
+            "command": {
+              "type": "string"
+            },
+            "reason": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "command",
+            "reason"
+          ],
+          "type": "object"
+        },
+        "type": "array"
+      }
+    },
+    "required": [
+      "kind",
+      "server"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "ip": {
+        "type": "string"
+      },
+      "kind": {
+        "const": "created-orphan",
+        "type": "string"
+      },
+      "name": {
+        "type": "string"
+      },
+      "provider": {
+        "enum": [
+          "hetzner",
+          "digitalocean",
+          "vultr",
+          "linode"
+        ],
+        "type": "string"
+      },
+      "providerId": {
+        "type": "string"
+      },
+      "suggestedCommand": {
+        "type": "string"
+      }
+    },
+    "required": [
+      "kind",
+      "provider",
+      "providerId",
+      "name",
+      "ip",
+      "suggestedCommand"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "kind": {
+        "const": "cancelled",
+        "type": "string"
+      },
+      "message": {
+        "type": "string"
+      },
+      "status": {
+        "const": "cancelled",
+        "type": "string"
+      }
+    },
+    "required": [
+      "kind",
+      "status",
+      "message"
+    ],
+    "type": "object"
+  }
+]

removedOutput schema / properties / result / properties

Removed value: -{
-  "hint": {
-    "type": "string"
-  },
-  "message": {
-    "type": "string"
-  },
-  "readiness": {
-    "additionalProperties": false,
-    "properties": {
-      "message": {
-        "type": "string"
-      },
-      "status": {
-        "enum": [
-          "pending",
-          "ready",
-          "unknown"
-        ],
-        "type": "string"
-      }
-    },
-    "required": [
-      "status"
-    ],
-    "type": "object"
-  },
-  "server": {
-    "additionalProperties": false,
-    "properties": {
-      "createdAt": {
-        "type": "string"
-      },
-      "id": {
-        "type": "string"
-      },
-      "ip": {
-        "type": "string"
-      },
-      "mode": {
-        "type": "string"
-      },
-      "name": {
-        "type": "string"
-      },
-      "provider": {
-        "type": "string"
-      },
-      "region": {
-        "type": "string"
-      },
-      "size": {
-        "type": "string"
-      }
-    },
-    "required": [
-      "id",
-      "name",
-      "provider",
-      "ip",
-      "region",
-      "size",
-      "mode",
-      "createdAt"
-    ],
-    "type": "object"
-  },
-  "success": {
-    "type": "boolean"
-  },
-  "suggested_actions": {
-    "items": {
-      "additionalProperties": false,
-      "properties": {
-        "command": {
-          "type": "string"
-        },
-        "reason": {
-          "type": "string"
-        }
-      },
-      "required": [
-        "command",
-        "reason"
-      ],
-      "type": "object"
-    },
-    "type": "array"
-  }
-}

removedOutput schema / properties / result / required

Removed value: -[
-  "success",
-  "message",
-  "server",
-  "readiness",
-  "suggested_actions"
-]

removedOutput schema / properties / result / type
```
Removed value: -"object"
```

Changed2 schema fields changedv2.3.0Jun 15, 2026

addedOutput schema / properties / result / properties / readiness

Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "message": {
+      "type": "string"
+    },
+    "status": {
+      "enum": [
+        "pending",
+        "ready",
+        "unknown"
+      ],
+      "type": "string"
+    }
+  },
+  "required": [
+    "status"
+  ],
+  "type": "object"
+}

changedOutput schema / properties / result / required

Previous value: -[
-  "success",
-  "message",
-  "server",
-  "suggested_actions"
-]New value: +[
+  "success",
+  "message",
+  "server",
+  "readiness",
+  "suggested_actions"
+]

Changed3 schema fields changedv2.2.6May 16, 2026

changedInput schema / properties / name / description

Previous value: -"Server hostname, 3-63 chars, lowercase, starts with letter, only alphanumeric and hyphens, ends with letter or number"New value: +"Server hostname, 3-63 chars, lowercase, starts with letter, only alphanumeric and hyphens, ends with letter or number. If omitted and client supports elicitation, a form will be shown."

changedInput schema / properties / provider / description

Previous value: -"Cloud provider to create server on"New value: +"Cloud provider to create server on. If omitted and client supports elicitation, a form will be shown."

removedInput schema / required

Removed value: -[
-  "provider",
-  "name"
-]

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": {
+      "additionalProperties": false,
+      "properties": {
+        "hint": {
+          "type": "string"
+        },
+        "message": {
+          "type": "string"
+        },
+        "server": {
+          "additionalProperties": false,
+          "properties": {
+            "createdAt": {
+              "type": "string"
+            },
+            "id": {
+              "type": "string"
+            },
+            "ip": {
+              "type": "string"
+            },
+            "mode": {
+              "type": "string"
+            },
+            "name": {
+              "type": "string"
+            },
+            "provider": {
+              "type": "string"
+            },
+            "region": {
+              "type": "string"
+            },
+            "size": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "id",
+            "name",
+            "provider",
+            "ip",
+            "region",
+            "size",
+            "mode",
+            "createdAt"
+          ],
+          "type": "object"
+        },
+        "success": {
+          "type": "boolean"
+        },
+        "suggested_actions": {
+          "items": {
+            "additionalProperties": false,
+            "properties": {
+              "command": {
+                "type": "string"
+              },
+              "reason": {
+                "type": "string"
+              }
+            },
+            "required": [
+              "command",
+              "reason"
+            ],
+            "type": "object"
+          },
+          "type": "array"
+        }
+      },
+      "required": [
+        "success",
+        "message",
+        "server",
+        "suggested_actions"
+      ],
+      "type": "object"
+    }
+  },
+  "required": [
+    "result"
+  ],
+  "type": "object"
+}

First observedv1.14.0Mar 25, 2026

TDQS

A4.7/5.0

Behavior5/5

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

Beyond annotations (destructiveHint=true), the description warns about creating a billable resource, mentions the 3-5 minute initialization delay, specifies required API tokens, and notes the blocking safe mode. This adds rich behavioral context beyond what annotations alone provide.

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

Conciseness5/5

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

The description is a single, well-structured paragraph that front-loads the core purpose, then lists modes, prerequisites, warnings, and timing. Every sentence adds value; no fluff. Capitalization and colons enhance readability.

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?

Given the tool's complexity (6 parameters, enums, multiple providers, security constraints), the description covers all essential aspects: core function, default behavior, alternatives, prerequisites, risks, and timing. An output schema exists (not shown), so return values need not be explained. Complete for effective use.

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

Parameters3/5

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

Schema description coverage is 100%, so baseline is 3. The description does not add parameter-specific details beyond the schema; it only restates defaults and modes. No extra semantic value for individual parameters is provided.

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 it provisions a new server on a cloud provider, with specific verb 'Provision' and resource 'server'. It distinguishes itself from sibling tools like server_audit, server_backup, etc., by being the creation action. The default mode and alternatives are explicitly mentioned.

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?

Explicitly states when to use (provisioning a server), provides a blocking condition (KASTELL_SAFE_MODE=true), and describes alternative modes (bare, dokploy) with distinct behaviors. Also gives environment variable requirements, which serve as prerequisites.

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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