Synoptic

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

TableJSON Schema

Name	Required	Description
`limit`	No	Maximum items to return in this page
`username`	No	Exact Synoptic username; omit for the signed-in user
`nextToken`	No	nextToken from the previous page, with the other arguments unchanged; omit for the first page

Output Schema

TableJSON Schema

Name	Required	Description	Default
`items`	Yes
`nextToken`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed2 schema fields changedOct 18, 2026

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"
+  }
+]

Changed12 schema fields changedOct 18, 2026

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 @"
```

First observedOct 17, 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, idempotentHint, destructiveHint=false and openWorldHint, so the safety profile is covered. The description adds genuinely useful behavior beyond that: the result is paginated and continued with nextToken, and the call scope silently defaults to the signed-in user when username is omitted. It does not mention rate limits or ordering, but with annotation coverage the bar is lower.

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?

Three tight sentences with the primary purpose front-loaded, followed by pagination behavior and then the disambiguation list. No filler and no 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?

An output schema exists, so return values need no prose. Between the description (scope, default target, pagination continuation, sibling routing) and the structured fields, an agent has everything needed to call this 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 documents limit, username ('omit for the signed-in user'), and nextToken ('omit for the first page'). The description restates the username default and nextToken continuation rather than adding new meaning, so the 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+resource ('List authors followed by...') and defines the scope precisely, including the default when username is omitted. It explicitly separates itself from the nearest siblings (streams_following, get_followers, is_following_user), so an agent can pick it without opening a schema.

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 alternatives with the condition that selects each: streams_following for the signed-in account's streams, get_followers for followers, is_following_user to check one author. Explicit when-to-use-this-vs-that guidance, nothing 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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