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kastelldev

Kastell

Official
by kastelldev
OverviewSchemaRelated ServersScoreDiscussions
TypeScript
Hybrid

server_plugin

Read-onlyIdempotent

List installed plugins with check counts and status, or validate manifest integrity and entry point validity.

Instructions

Manage kastell plugins. Actions: 'list' shows installed plugins with check counts and status, 'validate' checks manifest integrity and entry point validity. Install/remove not available via MCP — use CLI for security (requires explicit user consent). No SSH connection required.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
nameNoPlugin name for validate action (validates all if omitted)
actionYesAction: 'list' shows installed plugins, 'validate' checks manifest integrity. Install/remove not available via MCP — use CLI for security (requires explicit user consent).

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes

Schema Changelog

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

  1. Changed1 schema field changedv2.2.6
    • changedOutput schema / properties / result / oneOf
      Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "action": {
-        "const": "list",
-        "type": "string"
-      },
-      "count": {
-        "type": "number"
-      },
-      "plugins": {
-        "items": {
-          "additionalProperties": false,
-          "properties": {
-            "name": {
-              "type": "string"
-            },
-            "status": {
-              "type": "string"
-            },
-            "version": {
-              "type": "string"
-            }
-          },
-          "required": [
-            "name",
-            "status"
-          ],
-          "type": "object"
-        },
-        "type": "array"
-      }
-    },
-    "required": [
-      "action",
-      "plugins",
-      "count"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "action": {
-        "const": "validate",
-        "type": "string"
-      },
-      "results": {
-        "items": {
-          "additionalProperties": false,
-          "properties": {
-            "errors": {
-              "items": {
-                "type": "string"
-              },
-              "type": "array"
-            },
-            "name": {
-              "type": "string"
-            },
-            "valid": {
-              "type": "boolean"
-            }
-          },
-          "required": [
-            "name",
-            "valid"
-          ],
-          "type": "object"
-        },
-        "type": "array"
-      }
-    },
-    "required": [
-      "action",
-      "results"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "action": {
+        "const": "list",
+        "type": "string"
+      },
+      "count": {
+        "type": "number"
+      },
+      "plugins": {
+        "items": {
+          "additionalProperties": false,
+          "properties": {
+            "checks": {
+              "type": "number"
+            },
+            "commandCount": {
+              "type": "number"
+            },
+            "mcpToolCount": {
+              "type": "number"
+            },
+            "name": {
+              "type": "string"
+            },
+            "status": {
+              "type": "string"
+            },
+            "version": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "name",
+            "status"
+          ],
+          "type": "object"
+        },
+        "type": "array"
+      }
+    },
+    "required": [
+      "action",
+      "plugins",
+      "count"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "action": {
+        "const": "validate",
+        "type": "string"
+      },
+      "results": {
+        "items": {
+          "additionalProperties": false,
+          "properties": {
+            "errors": {
+              "items": {
+                "type": "string"
+              },
+              "type": "array"
+            },
+            "name": {
+              "type": "string"
+            },
+            "valid": {
+              "type": "boolean"
+            }
+          },
+          "required": [
+            "name",
+            "valid"
+          ],
+          "type": "object"
+        },
+        "type": "array"
+      }
+    },
+    "required": [
+      "action",
+      "results"
+    ],
+    "type": "object"
+  }
+]
  2. Changed1 schema field changedv2.2.4
    • 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": "list",
+              "type": "string"
+            },
+            "count": {
+              "type": "number"
+            },
+            "plugins": {
+              "items": {
+                "additionalProperties": false,
+                "properties": {
+                  "name": {
+                    "type": "string"
+                  },
+                  "status": {
+                    "type": "string"
+                  },
+                  "version": {
+                    "type": "string"
+                  }
+                },
+                "required": [
+                  "name",
+                  "status"
+                ],
+                "type": "object"
+              },
+              "type": "array"
+            }
+          },
+          "required": [
+            "action",
+            "plugins",
+            "count"
+          ],
+          "type": "object"
+        },
+        {
+          "additionalProperties": false,
+          "properties": {
+            "action": {
+              "const": "validate",
+              "type": "string"
+            },
+            "results": {
+              "items": {
+                "additionalProperties": false,
+                "properties": {
+                  "errors": {
+                    "items": {
+                      "type": "string"
+                    },
+                    "type": "array"
+                  },
+                  "name": {
+                    "type": "string"
+                  },
+                  "valid": {
+                    "type": "boolean"
+                  }
+                },
+                "required": [
+                  "name",
+                  "valid"
+                ],
+                "type": "object"
+              },
+              "type": "array"
+            }
+          },
+          "required": [
+            "action",
+            "results"
+          ],
+          "type": "object"
+        }
+      ]
+    }
+  },
+  "required": [
+    "result"
+  ],
+  "type": "object"
+}
  3. Addedv1.15.1

TDQS

A4.7/5.0
Behavior4/5

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

Annotations already declare readOnlyHint=true, destructiveHint=false, idempotentHint=true. The description adds useful context: install/remove are not available, and no SSH is needed. It does not contradict annotations.

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 very concise with three sentences. It front-loads the purpose, then lists actions, and finishes with important limitations and prerequisites. No unnecessary words.

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?

For a simple tool with two parameters, the description covers purpose, actions, limitations, and prerequisites. It is complete given the tool's complexity and the presence of an output schema.

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 description coverage is 100%, but the description adds meaning beyond the schema by explaining what 'list' and 'validate' do (e.g., 'shows check counts and status'). The 'name' parameter is explained as optional for validate.

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 'Manage kastell plugins' and enumerates the two specific actions ('list' and 'validate') with their effects. It distinguishes itself from sibling tools that manage other server aspects.

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 says when to use this tool (list, validate) and when not to (install/remove are not available via MCP, use CLI). It also notes that no SSH connection is required, providing clear usage context.

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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