AniList MCP Server

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Search activity feed

search_activity

Read-only

Search and filter AniList activity feeds by user or activity type, retrieving complete post content and engagement metrics in one response.

Instructions

Search/browse AniList's activity feed (list updates, text posts, messages), optionally filtered to one user and/or one activity type. Each result already includes its full content (text/message/status, replyCount/likeCount/isLiked, the posting user, and — for list activity — the media) — no follow-up get_activity call needed unless you need to re-check one specific result's replyCount/likeCount/isLiked later (e.g. after liking it).

Input Schema

TableJSON Schema

Name	Required	Description
`page`	No	Page number for pagination. AniList's paginated connections (search results, a title's characters/staff/reviews, activity feeds, forum comments) reject a page whose page × perPage exceeds ~5000 entries with an upstream error, so paging that deep fails rather than returning more results.
`type`	No	Restrict to this activity type. MEDIA_LIST matches both ANIME_LIST and MANGA_LIST activities; use ANIME_LIST/MANGA_LIST to restrict to just one.
`user`	No	Restrict results to this AniList user — numeric ID or exact username (resolved to an id with one extra internal lookup; no need to call search_user first unless you only have a partial/fuzzy name). An unknown ID or username errors with not_found rather than silently returning an empty result. Use get_user_activity instead if you only need one user's feed without the type filter.
`perPage`	No	Results per page (max 50, AniList's own ceiling — it silently clamps anything higher).

Output Schema

TableJSON Schema

Name	Required	Description	Default
`results`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed6 schema fields changedv0.9.0Sep 27, 2026

changedInput schema / properties / perPage / description

Previous value: -"Results per page (max 25)."New value: +"Results per page (max 50, AniList's own ceiling — it silently clamps anything higher)."

changedInput schema / properties / perPage / maximum
```
Previous value: -25New value: +50
```

changedInput schema / properties / user / description

Previous value: -"Restrict results to this AniList user — numeric ID or exact username (resolved to an id with one extra internal lookup; no need to call search_user first unless you only have a partial/fuzzy name). Validation is asymmetric: an unknown USERNAME errors ('No AniList user named ... was found'), but an unknown numeric ID does NOT — it silently returns an empty result, indistinguishable from 'this user has no matching activity'. Resolve a numeric ID via search_user first if you need to confirm the account actually exists. Use get_user_activity instead if you only need one user's feed without the type filter."New value: +"Restrict results to this AniList user — numeric ID or exact username (resolved to an id with one extra internal lookup; no need to call search_user first unless you only have a partial/fuzzy name). An unknown ID or username errors with not_found rather than silently returning an empty result. Use get_user_activity instead if you only need one user's feed without the type filter."

changedOutput schema / properties / results / properties / activities / items / oneOf

Previous value: -[
-  {
-    "additionalProperties": {},
-    "properties": {
-      "createdAt": {
-        "anyOf": [
-          {
-            "minimum": 0,
-            "type": "number"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "id": {
-        "exclusiveMinimum": 0,
-        "maximum": 2147483647,
-        "type": "integer"
-      },
-      "isLiked": {
-        "anyOf": [
-          {
-            "type": "boolean"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "likeCount": {
-        "anyOf": [
-          {
-            "maximum": 9007199254740991,
-            "minimum": 0,
-            "type": "integer"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "replyCount": {
-        "anyOf": [
-          {
-            "maximum": 9007199254740991,
-            "minimum": 0,
-            "type": "integer"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "siteUrl": {
-        "anyOf": [
-          {
-            "format": "uri",
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "text": {
-        "anyOf": [
-          {
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "type": {
-        "const": "TEXT",
-        "type": "string"
-      },
-      "user": {
-        "anyOf": [
-          {
-            "additionalProperties": {},
-            "properties": {
-              "id": {
-                "exclusiveMinimum": 0,
-                "maximum": 2147483647,
-                "type": "integer"
-              },
-              "name": {
-                "anyOf": [
-                  {
-                    "type": "string"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              }
-            },
-            "required": [
-              "id"
-            ],
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      }
-    },
-    "required": [
-      "id",
-      "type"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": {},
-    "properties": {
-      "createdAt": {
-        "anyOf": [
-          {
-            "minimum": 0,
-            "type": "number"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "id": {
-        "exclusiveMinimum": 0,
-        "maximum": 2147483647,
-        "type": "integer"
-      },
-      "isLiked": {
-        "anyOf": [
-          {
-            "type": "boolean"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "likeCount": {
-        "anyOf": [
-          {
-            "maximum": 9007199254740991,
-            "minimum": 0,
-            "type": "integer"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "media": {
-        "anyOf": [
-          {
-            "additionalProperties": {},
-            "properties": {
-              "id": {
-                "exclusiveMinimum": 0,
-                "maximum": 2147483647,
-                "type": "integer"
-              },
-              "title": {
-                "anyOf": [
-                  {
-                    "additionalProperties": false,
-                    "properties": {
-                      "english": {
-                        "anyOf": [
-                          {
-                            "type": "string"
-                          },
-                          {
-                            "type": "null"
-                          }
-                        ]
-                      },
-                      "romaji": {
-                        "anyOf": [
-                          {
-                            "type": "string"
-                          },
-                          {
-                            "type": "null"
-                          }
-                        ]
-                      }
-                    },
-                    "type": "object"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              }
-            },
-            "required": [
-              "id"
-            ],
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "progress": {
-        "anyOf": [
-          {
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "replyCount": {
-        "anyOf": [
-          {
-            "maximum": 9007199254740991,
-            "minimum": 0,
-            "type": "integer"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "siteUrl": {
-        "anyOf": [
-          {
-            "format": "uri",
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "status": {
-        "anyOf": [
-          {
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "type": {
-        "enum": [
-          "ANIME_LIST",
-          "MANGA_LIST",
-          "MEDIA_LIST"
-        ],
-        "type": "string"
-      },
-      "user": {
-        "anyOf": [
-          {
-            "additionalProperties": {},
-            "properties": {
-              "id": {
-                "exclusiveMinimum": 0,
-                "maximum": 2147483647,
-                "type": "integer"
-              },
-              "name": {
-                "anyOf": [
-                  {
-                    "type": "string"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              }
-            },
-            "required": [
-              "id"
-            ],
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      }
-    },
-    "required": [
-      "id",
-      "type"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": {},
-    "properties": {
-      "createdAt": {
-        "anyOf": [
-          {
-            "minimum": 0,
-            "type": "number"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "id": {
-        "exclusiveMinimum": 0,
-        "maximum": 2147483647,
-        "type": "integer"
-      },
-      "isLiked": {
-        "anyOf": [
-          {
-            "type": "boolean"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "likeCount": {
-        "anyOf": [
-          {
-            "maximum": 9007199254740991,
-            "minimum": 0,
-            "type": "integer"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "message": {
-        "anyOf": [
-          {
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "messenger": {
-        "anyOf": [
-          {
-            "additionalProperties": {},
-            "properties": {
-              "id": {
-                "exclusiveMinimum": 0,
-                "maximum": 2147483647,
-                "type": "integer"
-              },
-              "name": {
-                "anyOf": [
-                  {
-                    "type": "string"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              }
-            },
-            "required": [
-              "id"
-            ],
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "recipient": {
-        "anyOf": [
-          {
-            "additionalProperties": {},
-            "properties": {
-              "id": {
-                "exclusiveMinimum": 0,
-                "maximum": 2147483647,
-                "type": "integer"
-              },
-              "name": {
-                "anyOf": [
-                  {
-                    "type": "string"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              }
-            },
-            "required": [
-              "id"
-            ],
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "replyCount": {
-        "anyOf": [
-          {
-            "maximum": 9007199254740991,
-            "minimum": 0,
-            "type": "integer"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "siteUrl": {
-        "anyOf": [
-          {
-            "format": "uri",
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "type": {
-        "const": "MESSAGE",
-        "type": "string"
-      }
-    },
-    "required": [
-      "id",
-      "type"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "additionalProperties": {},
+    "properties": {
+      "createdAt": {
+        "anyOf": [
+          {
+            "minimum": 0,
+            "type": "number"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "id": {
+        "exclusiveMinimum": 0,
+        "maximum": 2147483647,
+        "type": "integer"
+      },
+      "isLiked": {
+        "type": [
+          "boolean",
+          "null"
+        ]
+      },
+      "likeCount": {
+        "anyOf": [
+          {
+            "maximum": 9007199254740991,
+            "minimum": 0,
+            "type": "integer"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "replyCount": {
+        "anyOf": [
+          {
+            "maximum": 9007199254740991,
+            "minimum": 0,
+            "type": "integer"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "siteUrl": {
+        "anyOf": [
+          {
+            "format": "uri",
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "text": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "type": {
+        "const": "TEXT",
+        "type": "string"
+      },
+      "user": {
+        "anyOf": [
+          {
+            "additionalProperties": {},
+            "properties": {
+              "id": {
+                "exclusiveMinimum": 0,
+                "maximum": 2147483647,
+                "type": "integer"
+              },
+              "name": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              }
+            },
+            "required": [
+              "id"
+            ],
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      }
+    },
+    "required": [
+      "id",
+      "type"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": {},
+    "properties": {
+      "createdAt": {
+        "anyOf": [
+          {
+            "minimum": 0,
+            "type": "number"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "id": {
+        "exclusiveMinimum": 0,
+        "maximum": 2147483647,
+        "type": "integer"
+      },
+      "isLiked": {
+        "type": [
+          "boolean",
+          "null"
+        ]
+      },
+      "likeCount": {
+        "anyOf": [
+          {
+            "maximum": 9007199254740991,
+            "minimum": 0,
+            "type": "integer"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "media": {
+        "anyOf": [
+          {
+            "additionalProperties": {},
+            "properties": {
+              "id": {
+                "exclusiveMinimum": 0,
+                "maximum": 2147483647,
+                "type": "integer"
+              },
+              "title": {
+                "anyOf": [
+                  {
+                    "additionalProperties": false,
+                    "properties": {
+                      "english": {
+                        "type": [
+                          "string",
+                          "null"
+                        ]
+                      },
+                      "romaji": {
+                        "type": [
+                          "string",
+                          "null"
+                        ]
+                      }
+                    },
+                    "type": "object"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              }
+            },
+            "required": [
+              "id"
+            ],
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "progress": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "replyCount": {
+        "anyOf": [
+          {
+            "maximum": 9007199254740991,
+            "minimum": 0,
+            "type": "integer"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "siteUrl": {
+        "anyOf": [
+          {
+            "format": "uri",
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "status": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "type": {
+        "enum": [
+          "ANIME_LIST",
+          "MANGA_LIST",
+          "MEDIA_LIST"
+        ],
+        "type": "string"
+      },
+      "user": {
+        "anyOf": [
+          {
+            "additionalProperties": {},
+            "properties": {
+              "id": {
+                "exclusiveMinimum": 0,
+                "maximum": 2147483647,
+                "type": "integer"
+              },
+              "name": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              }
+            },
+            "required": [
+              "id"
+            ],
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      }
+    },
+    "required": [
+      "id",
+      "type"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": {},
+    "properties": {
+      "createdAt": {
+        "anyOf": [
+          {
+            "minimum": 0,
+            "type": "number"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "id": {
+        "exclusiveMinimum": 0,
+        "maximum": 2147483647,
+        "type": "integer"
+      },
+      "isLiked": {
+        "type": [
+          "boolean",
+          "null"
+        ]
+      },
+      "likeCount": {
+        "anyOf": [
+          {
+            "maximum": 9007199254740991,
+            "minimum": 0,
+            "type": "integer"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "message": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "messenger": {
+        "anyOf": [
+          {
+            "additionalProperties": {},
+            "properties": {
+              "id": {
+                "exclusiveMinimum": 0,
+                "maximum": 2147483647,
+                "type": "integer"
+              },
+              "name": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              }
+            },
+            "required": [
+              "id"
+            ],
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "recipient": {
+        "anyOf": [
+          {
+            "additionalProperties": {},
+            "properties": {
+              "id": {
+                "exclusiveMinimum": 0,
+                "maximum": 2147483647,
+                "type": "integer"
+              },
+              "name": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              }
+            },
+            "required": [
+              "id"
+            ],
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "replyCount": {
+        "anyOf": [
+          {
+            "maximum": 9007199254740991,
+            "minimum": 0,
+            "type": "integer"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "siteUrl": {
+        "anyOf": [
+          {
+            "format": "uri",
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "type": {
+        "const": "MESSAGE",
+        "type": "string"
+      }
+    },
+    "required": [
+      "id",
+      "type"
+    ],
+    "type": "object"
+  }
+]

removedOutput schema / properties / results / properties / pageInfo / properties / hasNextPage / anyOf
```
Removed value: -[
-  {
-    "type": "boolean"
-  },
-  {
-    "type": "null"
-  }
-]
```
addedOutput schema / properties / results / properties / pageInfo / properties / hasNextPage / type
```
Added value: +[
+  "boolean",
+  "null"
+]
```

Changed10 schema fields changedv0.7.1Aug 1, 2026

changedInput schema / properties / page / description

Previous value: -"Page number for pagination."New value: +"Page number for pagination. AniList's paginated connections (search results, a title's characters/staff/reviews, activity feeds, forum comments) reject a page whose page × perPage exceeds ~5000 entries with an upstream error, so paging that deep fails rather than returning more results."

addedInput schema / properties / perPage / exclusiveMinimum
```
Added value: +0
```
removedInput schema / properties / perPage / minimum
```
Removed value: -1
```

changedInput schema / properties / user / anyOf

Previous value: -[
-  {
-    "maximum": 2147483647,
-    "minimum": -2147483648,
-    "type": "integer"
-  },
-  {
-    "minLength": 1,
-    "type": "string"
-  }
-]New value: +[
+  {
+    "exclusiveMinimum": 0,
+    "maximum": 2147483647,
+    "type": "integer"
+  },
+  {
+    "minLength": 1,
+    "type": "string"
+  }
+]

removedOutput schema / properties / results / properties / activities / items / additionalProperties
```
Removed value: -{}
```

removedOutput schema / properties / results / properties / activities / items / description

Removed value: -"Only `id` is guaranteed here — the real object has more fields, but their shape depends on which variant of an underlying union type this is (e.g. which activity type), so only the field common to every variant is declared."

addedOutput schema / properties / results / properties / activities / items / oneOf

Added value: +[
+  {
+    "additionalProperties": {},
+    "properties": {
+      "createdAt": {
+        "anyOf": [
+          {
+            "minimum": 0,
+            "type": "number"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "id": {
+        "exclusiveMinimum": 0,
+        "maximum": 2147483647,
+        "type": "integer"
+      },
+      "isLiked": {
+        "anyOf": [
+          {
+            "type": "boolean"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "likeCount": {
+        "anyOf": [
+          {
+            "maximum": 9007199254740991,
+            "minimum": 0,
+            "type": "integer"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "replyCount": {
+        "anyOf": [
+          {
+            "maximum": 9007199254740991,
+            "minimum": 0,
+            "type": "integer"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "siteUrl": {
+        "anyOf": [
+          {
+            "format": "uri",
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "text": {
+        "anyOf": [
+          {
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "type": {
+        "const": "TEXT",
+        "type": "string"
+      },
+      "user": {
+        "anyOf": [
+          {
+            "additionalProperties": {},
+            "properties": {
+              "id": {
+                "exclusiveMinimum": 0,
+                "maximum": 2147483647,
+                "type": "integer"
+              },
+              "name": {
+                "anyOf": [
+                  {
+                    "type": "string"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              }
+            },
+            "required": [
+              "id"
+            ],
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      }
+    },
+    "required": [
+      "id",
+      "type"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": {},
+    "properties": {
+      "createdAt": {
+        "anyOf": [
+          {
+            "minimum": 0,
+            "type": "number"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "id": {
+        "exclusiveMinimum": 0,
+        "maximum": 2147483647,
+        "type": "integer"
+      },
+      "isLiked": {
+        "anyOf": [
+          {
+            "type": "boolean"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "likeCount": {
+        "anyOf": [
+          {
+            "maximum": 9007199254740991,
+            "minimum": 0,
+            "type": "integer"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "media": {
+        "anyOf": [
+          {
+            "additionalProperties": {},
+            "properties": {
+              "id": {
+                "exclusiveMinimum": 0,
+                "maximum": 2147483647,
+                "type": "integer"
+              },
+              "title": {
+                "anyOf": [
+                  {
+                    "additionalProperties": false,
+                    "properties": {
+                      "english": {
+                        "anyOf": [
+                          {
+                            "type": "string"
+                          },
+                          {
+                            "type": "null"
+                          }
+                        ]
+                      },
+                      "romaji": {
+                        "anyOf": [
+                          {
+                            "type": "string"
+                          },
+                          {
+                            "type": "null"
+                          }
+                        ]
+                      }
+                    },
+                    "type": "object"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              }
+            },
+            "required": [
+              "id"
+            ],
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "progress": {
+        "anyOf": [
+          {
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "replyCount": {
+        "anyOf": [
+          {
+            "maximum": 9007199254740991,
+            "minimum": 0,
+            "type": "integer"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "siteUrl": {
+        "anyOf": [
+          {
+            "format": "uri",
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "status": {
+        "anyOf": [
+          {
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "type": {
+        "enum": [
+          "ANIME_LIST",
+          "MANGA_LIST",
+          "MEDIA_LIST"
+        ],
+        "type": "string"
+      },
+      "user": {
+        "anyOf": [
+          {
+            "additionalProperties": {},
+            "properties": {
+              "id": {
+                "exclusiveMinimum": 0,
+                "maximum": 2147483647,
+                "type": "integer"
+              },
+              "name": {
+                "anyOf": [
+                  {
+                    "type": "string"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              }
+            },
+            "required": [
+              "id"
+            ],
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      }
+    },
+    "required": [
+      "id",
+      "type"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": {},
+    "properties": {
+      "createdAt": {
+        "anyOf": [
+          {
+            "minimum": 0,
+            "type": "number"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "id": {
+        "exclusiveMinimum": 0,
+        "maximum": 2147483647,
+        "type": "integer"
+      },
+      "isLiked": {
+        "anyOf": [
+          {
+            "type": "boolean"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "likeCount": {
+        "anyOf": [
+          {
+            "maximum": 9007199254740991,
+            "minimum": 0,
+            "type": "integer"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "message": {
+        "anyOf": [
+          {
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "messenger": {
+        "anyOf": [
+          {
+            "additionalProperties": {},
+            "properties": {
+              "id": {
+                "exclusiveMinimum": 0,
+                "maximum": 2147483647,
+                "type": "integer"
+              },
+              "name": {
+                "anyOf": [
+                  {
+                    "type": "string"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              }
+            },
+            "required": [
+              "id"
+            ],
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "recipient": {
+        "anyOf": [
+          {
+            "additionalProperties": {},
+            "properties": {
+              "id": {
+                "exclusiveMinimum": 0,
+                "maximum": 2147483647,
+                "type": "integer"
+              },
+              "name": {
+                "anyOf": [
+                  {
+                    "type": "string"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              }
+            },
+            "required": [
+              "id"
+            ],
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "replyCount": {
+        "anyOf": [
+          {
+            "maximum": 9007199254740991,
+            "minimum": 0,
+            "type": "integer"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "siteUrl": {
+        "anyOf": [
+          {
+            "format": "uri",
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "type": {
+        "const": "MESSAGE",
+        "type": "string"
+      }
+    },
+    "required": [
+      "id",
+      "type"
+    ],
+    "type": "object"
+  }
+]

removedOutput schema / properties / results / properties / activities / items / properties

Removed value: -{
-  "id": {
-    "maximum": 9007199254740991,
-    "minimum": -9007199254740991,
-    "type": "integer"
-  }
-}

removedOutput schema / properties / results / properties / activities / items / required
```
Removed value: -[
-  "id"
-]
```
removedOutput schema / properties / results / properties / activities / items / type
```
Removed value: -"object"
```

Changed2 schema fields changedv0.4.0Jul 28, 2026

changedInput schema / properties / user / description

Previous value: -"Restrict results to this AniList user — numeric ID or exact username (resolved to an id with one extra internal lookup; no need to call search_user first unless you only have a partial/fuzzy name). Use get_user_activity instead if you only need one user's feed without the type filter."New value: +"Restrict results to this AniList user — numeric ID or exact username (resolved to an id with one extra internal lookup; no need to call search_user first unless you only have a partial/fuzzy name). Validation is asymmetric: an unknown USERNAME errors ('No AniList user named ... was found'), but an unknown numeric ID does NOT — it silently returns an empty result, indistinguishable from 'this user has no matching activity'. Resolve a numeric ID via search_user first if you need to confirm the account actually exists. Use get_user_activity instead if you only need one user's feed without the type filter."

addedOutput schema / properties / results / properties / activities / items / description

Added value: +"Only `id` is guaranteed here — the real object has more fields, but their shape depends on which variant of an underlying union type this is (e.g. which activity type), so only the field common to every variant is declared."

Changed2 schema fields changedv0.3.0Jul 26, 2026

addedInput schema / properties / user

Added value: +{
+  "anyOf": [
+    {
+      "maximum": 2147483647,
+      "minimum": -2147483648,
+      "type": "integer"
+    },
+    {
+      "minLength": 1,
+      "type": "string"
+    }
+  ],
+  "description": "Restrict results to this AniList user — numeric ID or exact username (resolved to an id with one extra internal lookup; no need to call search_user first unless you only have a partial/fuzzy name). Use get_user_activity instead if you only need one user's feed without the type filter."
+}

removedInput schema / properties / userId

Removed value: -{
-  "description": "Restrict results to this AniList user ID — numeric only; resolve one via search_user first, or use get_user_activity instead if you already have an exact username.",
-  "maximum": 2147483647,
-  "minimum": -2147483648,
-  "type": "integer"
-}

Addedv0.2.0Jul 21, 2026

TDQS

A4.5/5.0

Behavior4/5

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

Annotations already declare readOnlyHint and openWorldHint, covering the safety profile. The description adds meaningful result-behavior context: each result is self-contained, includes all content, and a follow-up call is only needed to re-check mutable fields after a reaction. This is genuinely useful beyond the 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?

Two dense sentences with the core capability front-loaded and the follow-up guidance placed right after. Every clause is actionable, and there is no filler or repetition of the title.

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?

With the output schema available cherry plus a 100%-covered input schema, the description covers all the essential decision points: what the tool returns, when a follow-up is unnecessary, and when to use get_user_activity. An agent has enough information to select and invoke this tool 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?

Schema description coverage is 100% and the schema already provides detailed explanations for user, type, page, and perPage. The tool description restates the filters but adds little parameter-specific meaning beyond what the schema already carries, so it stays at the baseline rather than compensating further.

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 uses a specific verb and resource: 'Search/browse AniList's activity feed,' and clearly states the optional user/type filters. It also distinguishes itself from the sibling get_activity tool by noting that results are already complete and no follow-up call is needed.

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 main description explicitly tells agents not to call get_activity afterward because results include full content, and only re-check after actions like liking. The schema further routes to get_user_activity when only a single user's feed is needed without a type filter, and clarifies that search_user is unnecessary for exact usernames.

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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