Get Metadata

get_metadata

Read-onlyIdempotent

Get full metadata for an archived item by identifier. Returns title, creator, date, format, size, and access details.

Input Schema

Name	Required	Description	Default
`id`	Yes	Archive.org item identifier (e.g., "principleofrelat00eins", "ApolloMissionsMoonLandings")

Output Schema

Name	Required	Description
`id`	Yes	Archive.org item identifier
`url`	Yes	Direct link to item on archive.org
`date`	Yes	Publication or creation date
`files`	Yes	List of files (first 20)
`title`	Yes	Item title
`creator`	Yes	List of item creators
`language`	Yes	Primary language of the item
`subjects`	Yes	List of subject tags
`downloads`	Yes	Number of downloads
`mediatype`	Yes	Media type
`added_date`	Yes	Date item was added to archive
`description`	Yes	Item description
`files_count`	Yes	Total number of files in item
`license_url`	Yes	URL to license information
`public_date`	Yes	Date item was made public
`item_size_bytes`	Yes	Total size of item in bytes

Schema Changelog

Changes observed during successful MCP inspections.

Changed2 schema fields changedMay 24, 2026

addedInput schema / examples

Added value: +[
+  {
+    "id": "principleofrelat00eins"
+  },
+  {
+    "id": "ApolloMissionsMoonLandings"
+  }
+]

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "properties": {
+    "added_date": {
+      "description": "Date item was added to archive",
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "creator": {
+      "description": "List of item creators",
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "date": {
+      "description": "Publication or creation date",
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "description": {
+      "description": "Item description",
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "downloads": {
+      "description": "Number of downloads",
+      "type": [
+        "number",
+        "null"
+      ]
+    },
+    "files": {
+      "description": "List of files (first 20)",
+      "items": {
+        "properties": {
+          "format": {
+            "description": "File format",
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "md5": {
+            "description": "MD5 checksum of file",
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "name": {
+            "description": "File name",
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "size_bytes": {
+            "description": "File size in bytes",
+            "type": [
+              "number",
+              "null"
+            ]
+          }
+        },
+        "required": [
+          "name",
+          "format",
+          "size_bytes",
+          "md5"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "files_count": {
+      "description": "Total number of files in item",
+      "type": [
+        "number",
+        "null"
+      ]
+    },
+    "id": {
+      "description": "Archive.org item identifier",
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "item_size_bytes": {
+      "description": "Total size of item in bytes",
+      "type": [
+        "number",
+        "null"
+      ]
+    },
+    "language": {
+      "description": "Primary language of the item",
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "license_url": {
+      "description": "URL to license information",
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "mediatype": {
+      "description": "Media type",
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "public_date": {
+      "description": "Date item was made public",
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "subjects": {
+      "description": "List of subject tags",
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "title": {
+      "description": "Item title",
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "url": {
+      "description": "Direct link to item on archive.org",
+      "type": "string"
+    }
+  },
+  "required": [
+    "id",
+    "title",
+    "creator",
+    "date",
+    "description",
+    "mediatype",
+    "subjects",
+    "language",
+    "license_url",
+    "added_date",
+    "public_date",
+    "downloads",
+    "files_count",
+    "item_size_bytes",
+    "url",
+    "files"
+  ],
+  "type": "object"
+}

Changed2 schema fields changedMay 13, 2026

removedInput schema / examples

Removed value: -[
-  {
-    "url": "https://www.example.com"
-  },
-  {
-    "url": "https://github.com/microlinkhq/sdk"
-  }
-]

changedOutput schema / (root)

Previous value: -{
-  "properties": {
-    "author": {
-      "description": "Author of the page content",
-      "type": [
-        "string",
-        "null"
-      ]
-    },
-    "date": {
-      "description": "Publication or modification date",
-      "type": [
-        "string",
-        "null"
-      ]
-    },
-    "description": {
-      "description": "Page description or meta description",
-      "type": [
-        "string",
-        "null"
-      ]
-    },
-    "image": {
-      "description": "Primary image metadata",
-      "properties": {
-        "height": {
-          "description": "Image height in pixels",
-          "type": [
-            "number",
-            "null"
-          ]
-        },
-        "url": {
-          "description": "Image URL",
-          "type": "string"
-        },
-        "width": {
-          "description": "Image width in pixels",
-          "type": [
-            "number",
-            "null"
-          ]
-        }
-      },
-      "type": [
-        "object",
-        "null"
-      ]
-    },
-    "lang": {
-      "description": "Language of the page",
-      "type": [
-        "string",
-        "null"
-      ]
-    },
-    "logo": {
-      "description": "Logo metadata",
-      "properties": {
-        "height": {
-          "description": "Logo height in pixels",
-          "type": [
-            "number",
-            "null"
-          ]
-        },
-        "url": {
-          "description": "Logo URL",
-          "type": "string"
-        },
-        "width": {
-          "description": "Logo width in pixels",
-          "type": [
-            "number",
-            "null"
-          ]
-        }
-      },
-      "type": [
-        "object",
-        "null"
-      ]
-    },
-    "publisher": {
-      "description": "Publisher of the page",
-      "type": [
-        "string",
-        "null"
-      ]
-    },
-    "title": {
-      "description": "Page title",
-      "type": [
-        "string",
-        "null"
-      ]
-    },
-    "url": {
-      "description": "The URL of the webpage",
-      "type": [
-        "string",
-        "null"
-      ]
-    }
-  },
-  "type": "object"
-}New value: +null

Changed1 schema field changedMay 8, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "properties": {
+    "author": {
+      "description": "Author of the page content",
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "date": {
+      "description": "Publication or modification date",
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "description": {
+      "description": "Page description or meta description",
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "image": {
+      "description": "Primary image metadata",
+      "properties": {
+        "height": {
+          "description": "Image height in pixels",
+          "type": [
+            "number",
+            "null"
+          ]
+        },
+        "url": {
+          "description": "Image URL",
+          "type": "string"
+        },
+        "width": {
+          "description": "Image width in pixels",
+          "type": [
+            "number",
+            "null"
+          ]
+        }
+      },
+      "type": [
+        "object",
+        "null"
+      ]
+    },
+    "lang": {
+      "description": "Language of the page",
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "logo": {
+      "description": "Logo metadata",
+      "properties": {
+        "height": {
+          "description": "Logo height in pixels",
+          "type": [
+            "number",
+            "null"
+          ]
+        },
+        "url": {
+          "description": "Logo URL",
+          "type": "string"
+        },
+        "width": {
+          "description": "Logo width in pixels",
+          "type": [
+            "number",
+            "null"
+          ]
+        }
+      },
+      "type": [
+        "object",
+        "null"
+      ]
+    },
+    "publisher": {
+      "description": "Publisher of the page",
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "title": {
+      "description": "Page title",
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "url": {
+      "description": "The URL of the webpage",
+      "type": [
+        "string",
+        "null"
+      ]
+    }
+  },
+  "type": "object"
+}

Changed1 schema field changedMay 6, 2026

addedInput schema / examples

Added value: +[
+  {
+    "url": "https://www.example.com"
+  },
+  {
+    "url": "https://github.com/microlinkhq/sdk"
+  }
+]

First observedApr 14, 2026

TDQS

A4.3/5.0

Behavior4/5

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

Annotations already establish read-only and non-destructive behavior. The description adds useful context by specifying the tool returns title, creator, date, format, size, and access details, going beyond the annotation info.

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 two concise sentences, front-loaded with the action and resource. Every word adds value, with no redundancy.

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 read-only tool with one fully documented parameter and an output schema, the description covers all essential behavior. It is complete and sufficient for the agent to select and invoke correctly.

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?

The schema fully describes the single 'id' parameter with examples and 100% coverage. The description adds no further semantic detail, so the baseline score of 3 applies.

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's purpose: 'Get full metadata for an archived item by identifier.' This specific verb+resource scope distinguishes it from sibling tools like search or list_files.

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?

The description clearly implies usage when an identifier is available, but it does not explicitly name alternatives or exclusions. It provides clear context (by identifier) without explicit when-not-to-use guidance.

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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Input Schema

Output Schema

Schema Changelog

TDQS

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