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Synoptic

by com.synoptic
OverviewDiscussionsAdmin

List followers

get_followers
Read-onlyIdempotent

List followers of a Synoptic username, or the signed-in user when username is omitted. Continue with nextToken. Use get_following_users for the authors a user follows.

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 cover the safety profile (readOnly, idempotent, non-destructive, openWorld), so the bar is lower. The description adds genuine behavior beyond them: this is a paginated endpoint continued via nextToken, and the default resolves to the signed-in user. It stops short of return-shape details, which the output schema covers.

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 short sentences: purpose and default first, pagination continuation second, sibling disambiguation last. Front-loaded and free of filler.

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?

Complete for a paginated list tool: annotations carry the safety profile, the schema documents all three parameters, and an output schema exists so return values need no explanation. Nothing an agent needs to call it correctly is missing.

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 already fully documented. The description's 'omit username for the signed-in user' and 'continue with nextToken' restate what the schema already says, adding no syntax or format detail beyond it. Baseline 3 is appropriate.

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 (List) and resource (followers of a Synoptic username), including the scope qualifier that it resolves to the signed-in user when username is omitted. It also names the sibling it is not (get_following_users), so an agent can distinguish it from that tool without opening either 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?

Explicitly names the alternative get_following_users and the distinguishing condition ('the authors a user follows'), plus the default-target rule when username is omitted. The routing decision is fully determined from the text alone.

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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