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Synoptic

by com.synoptic
OverviewDiscussionsAdmin

List followed authors

get_following_users
Read-onlyIdempotent

List authors followed by a Synoptic username, or by the signed-in user when username is omitted. Continue with nextToken. Lists users only: use streams_following for the signed-in account’s followed streams, get_followers for a user’s followers, or is_following_user to check one author.

Input Schema

NameRequiredDescriptionDefault
limitNoMaximum items to return in this page
usernameNoExact Synoptic username; omit for the signed-in user
nextTokenNonextToken from the previous page, with the other arguments unchanged; omit for the first page

Output Schema

NameRequiredDescriptionDefault
itemsYes
nextTokenNo

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed2 schema fields changed
    • removedOutput schema / properties / items / items / properties / medalsCount
      Removed value: -{
-  "type": "number"
-}
    • changedOutput schema / properties / items / items / required
      Previous value: -[
-  "id",
-  "username",
-  "fullName",
-  "createdAt",
-  "followingCount",
-  "followersCount",
-  "medalsCount",
-  "isHighlighted"
-]New value: +[
+  "id",
+  "username",
+  "fullName",
+  "createdAt",
+  "followingCount",
+  "followersCount",
+  "isHighlighted"
+]
  2. Changed2 schema fields changed
    • changedOutput schema / properties / items / items / properties / avatar / anyOf
      Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "bucket": {
-        "description": "S3 bucket holding the image",
-        "minLength": 1,
-        "type": "string"
-      },
-      "height": {
-        "anyOf": [
-          {
-            "exclusiveMinimum": 0,
-            "type": "integer"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "description": "Height in pixels"
-      },
-      "key": {
-        "description": "Storage key of the image",
-        "minLength": 1,
-        "type": "string"
-      },
-      "region": {
-        "description": "AWS region of the bucket",
-        "minLength": 1,
-        "type": "string"
-      },
-      "type": {
-        "description": "MIME type, such as image/png",
-        "minLength": 1,
-        "type": "string"
-      },
-      "width": {
-        "anyOf": [
-          {
-            "exclusiveMinimum": 0,
-            "type": "integer"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "description": "Width in pixels"
-      }
-    },
-    "required": [
-      "bucket",
-      "key",
-      "region",
-      "type"
-    ],
-    "type": "object"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "bucket": {
+        "minLength": 1,
+        "type": "string"
+      },
+      "height": {
+        "anyOf": [
+          {
+            "exclusiveMinimum": 0,
+            "type": "integer"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "key": {
+        "minLength": 1,
+        "type": "string"
+      },
+      "region": {
+        "minLength": 1,
+        "type": "string"
+      },
+      "type": {
+        "description": "MIME type, such as image/png",
+        "minLength": 1,
+        "type": "string"
+      },
+      "width": {
+        "anyOf": [
+          {
+            "exclusiveMinimum": 0,
+            "type": "integer"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      }
+    },
+    "required": [
+      "bucket",
+      "key",
+      "region",
+      "type"
+    ],
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]
    • changedOutput schema / properties / items / items / properties / backgroundImage / anyOf
      Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "bucket": {
-        "description": "S3 bucket holding the image",
-        "minLength": 1,
-        "type": "string"
-      },
-      "height": {
-        "anyOf": [
-          {
-            "exclusiveMinimum": 0,
-            "type": "integer"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "description": "Height in pixels"
-      },
-      "key": {
-        "description": "Storage key of the image",
-        "minLength": 1,
-        "type": "string"
-      },
-      "region": {
-        "description": "AWS region of the bucket",
-        "minLength": 1,
-        "type": "string"
-      },
-      "type": {
-        "description": "MIME type, such as image/png",
-        "minLength": 1,
-        "type": "string"
-      },
-      "width": {
-        "anyOf": [
-          {
-            "exclusiveMinimum": 0,
-            "type": "integer"
-          },
-          {
-            "type": "null"
-          }
-        ],
-        "description": "Width in pixels"
-      }
-    },
-    "required": [
-      "bucket",
-      "key",
-      "region",
-      "type"
-    ],
-    "type": "object"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "bucket": {
+        "minLength": 1,
+        "type": "string"
+      },
+      "height": {
+        "anyOf": [
+          {
+            "exclusiveMinimum": 0,
+            "type": "integer"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "key": {
+        "minLength": 1,
+        "type": "string"
+      },
+      "region": {
+        "minLength": 1,
+        "type": "string"
+      },
+      "type": {
+        "description": "MIME type, such as image/png",
+        "minLength": 1,
+        "type": "string"
+      },
+      "width": {
+        "anyOf": [
+          {
+            "exclusiveMinimum": 0,
+            "type": "integer"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      }
+    },
+    "required": [
+      "bucket",
+      "key",
+      "region",
+      "type"
+    ],
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]
  3. Changed12 schema fields changed
    • addedInput schema / properties / limit / description
      Added value: +"Maximum items to return in this page"
    • addedInput schema / properties / nextToken / description
      Added value: +"nextToken from the previous page, with the other arguments unchanged; omit for the first page"
    • addedInput schema / properties / username / description
      Added value: +"Exact Synoptic username; omit for the signed-in user"
    • changedOutput schema / properties / items / items / properties / avatar / anyOf
      Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "bucket": {
-        "minLength": 1,
-        "type": "string"
-      },
-      "height": {
-        "anyOf": [
-          {
-            "exclusiveMinimum": 0,
-            "type": "integer"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "key": {
-        "minLength": 1,
-        "type": "string"
-      },
-      "region": {
-        "minLength": 1,
-        "type": "string"
-      },
-      "type": {
-        "minLength": 1,
-        "type": "string"
-      },
-      "width": {
-        "anyOf": [
-          {
-            "exclusiveMinimum": 0,
-            "type": "integer"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      }
-    },
-    "required": [
-      "bucket",
-      "key",
-      "region",
-      "type"
-    ],
-    "type": "object"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "bucket": {
+        "description": "S3 bucket holding the image",
+        "minLength": 1,
+        "type": "string"
+      },
+      "height": {
+        "anyOf": [
+          {
+            "exclusiveMinimum": 0,
+            "type": "integer"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "description": "Height in pixels"
+      },
+      "key": {
+        "description": "Storage key of the image",
+        "minLength": 1,
+        "type": "string"
+      },
+      "region": {
+        "description": "AWS region of the bucket",
+        "minLength": 1,
+        "type": "string"
+      },
+      "type": {
+        "description": "MIME type, such as image/png",
+        "minLength": 1,
+        "type": "string"
+      },
+      "width": {
+        "anyOf": [
+          {
+            "exclusiveMinimum": 0,
+            "type": "integer"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "description": "Width in pixels"
+      }
+    },
+    "required": [
+      "bucket",
+      "key",
+      "region",
+      "type"
+    ],
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]
    • addedOutput schema / properties / items / items / properties / avatar / description
      Added value: +"Profile image; null when none is set"
    • changedOutput schema / properties / items / items / properties / backgroundImage / anyOf
      Previous value: -[
-  {
-    "$ref": "#/properties/items/items/properties/avatar/anyOf/0"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "bucket": {
+        "description": "S3 bucket holding the image",
+        "minLength": 1,
+        "type": "string"
+      },
+      "height": {
+        "anyOf": [
+          {
+            "exclusiveMinimum": 0,
+            "type": "integer"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "description": "Height in pixels"
+      },
+      "key": {
+        "description": "Storage key of the image",
+        "minLength": 1,
+        "type": "string"
+      },
+      "region": {
+        "description": "AWS region of the bucket",
+        "minLength": 1,
+        "type": "string"
+      },
+      "type": {
+        "description": "MIME type, such as image/png",
+        "minLength": 1,
+        "type": "string"
+      },
+      "width": {
+        "anyOf": [
+          {
+            "exclusiveMinimum": 0,
+            "type": "integer"
+          },
+          {
+            "type": "null"
+          }
+        ],
+        "description": "Width in pixels"
+      }
+    },
+    "required": [
+      "bucket",
+      "key",
+      "region",
+      "type"
+    ],
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]
    • addedOutput schema / properties / items / items / properties / backgroundImage / description
      Added value: +"Profile background image; null when none is set"
    • addedOutput schema / properties / items / items / properties / followersCount / description
      Added value: +"Users following this user"
    • addedOutput schema / properties / items / items / properties / followingCount / description
      Added value: +"Users this user follows; excludes streams"
    • addedOutput schema / properties / items / items / properties / id / description
      Added value: +"Synoptic user ID for follow_user, is_following_user or get_user_by_id"
    • addedOutput schema / properties / items / items / properties / isHighlighted / description
      Added value: +"Featured by Synoptic; listed by get_highlighted_authors"
    • addedOutput schema / properties / items / items / properties / xComHandle / description
      Added value: +"Verified X handle linked to this profile, without @"
  4. First observed

TDQS

A4.5/5.0
Behavior4/5

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

Annotations already declare readOnlyHint, idempotentHint, non-destructive, openWorld, so the safety profile is covered. The description adds behavioral value beyond that: how to page through results with nextToken and that the target defaults to the signed-in user. It stops short of return-shape or rate-limit detail, but the output schema covers the former.

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 sentences, zero filler, and front-loaded with the core action and default subject before the disambiguation clause. Every clause carries routing or scoping information.

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 rich annotations, a 100%-covered input schema, and an output schema handling return values, the description supplies exactly the missing pieces: sibling disambiguation, default-subject behavior, and pagination continuation. An agent can call this correctly without opening other tools.

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 limit, username, and nextToken are fully documented in the schema itself. The description's notes on omitting username and continuing with nextToken largely restate what the schema already says, so baseline 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?

States a specific verb and resource ('List authors followed by a Synoptic username') and immediately defines the default subject when username is omitted. It explicitly separates itself from adjacent tools (streams_following, get_followers) and clarifies that it returns users only, not streams.

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?

Names three alternative tools with the exact condition that selects each: streams_following for followed streams of the signed-in account, get_followers for a user's followers, is_following_user for checking a single author. Also gives the continuation condition ('Continue with nextToken'). Nothing is left to inference.

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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