Influence

List Ghost newsletters

ghostNewsletterList

Read-onlyIdempotent

List active newsletters. Selecting one explicitly sends email when the article publishes. Requires an owned active account and current provider availability. Follow nextCursor until done, keeping the same connection and search fields.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`cursor`	No	nextCursor from the previous page of this exact tool and input
`connectionId`	Yes	Owned connectionId returned by accountList

Output Schema

TableJSON Schema

Name	Required	Description	Default
No arguments

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedOct 20, 2026

changedOutput schema / oneOf

Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "ok": {
-        "const": true,
-        "type": "boolean"
-      },
-      "output": {
-        "additionalProperties": false,
-        "properties": {
-          "output": {
-            "additionalProperties": false,
-            "properties": {
-              "done": {
-                "$ref": "#/$defs/__schema0"
-              },
-              "items": {
-                "$ref": "#/$defs/__schema1"
-              },
-              "nextCursor": {
-                "$ref": "#/$defs/__schema3"
-              }
-            },
-            "required": [
-              "done",
-              "items"
-            ],
-            "type": "object"
-          }
-        },
-        "required": [
-          "output"
-        ],
-        "type": "object"
-      },
-      "toolName": {
-        "const": "ghostNewsletterList",
-        "type": "string"
-      }
-    },
-    "required": [
-      "ok",
-      "output",
-      "toolName"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "error": {
-        "additionalProperties": false,
-        "properties": {
-          "code": {
-            "enum": [
-              "INVALID_INPUT",
-              "FORBIDDEN",
-              "NOT_FOUND",
-              "CONFLICT",
-              "FEATURE_DISABLED",
-              "CONFIRMATION_REQUIRED",
-              "CONFIRMATION_INVALID",
-              "UPSTREAM_FAILED",
-              "NEEDS_REVIEW",
-              "INTERNAL"
-            ],
-            "type": "string"
-          },
-          "message": {
-            "maxLength": 2048,
-            "minLength": 1,
-            "type": "string"
-          },
-          "retryable": {
-            "type": "boolean"
-          }
-        },
-        "required": [
-          "code",
-          "message",
-          "retryable"
-        ],
-        "type": "object"
-      },
-      "ok": {
-        "const": false,
-        "type": "boolean"
-      },
-      "toolName": {
-        "const": "ghostNewsletterList",
-        "type": "string"
-      }
-    },
-    "required": [
-      "error",
-      "ok",
-      "toolName"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "ok": {
+        "const": true,
+        "type": "boolean"
+      },
+      "output": {
+        "additionalProperties": false,
+        "properties": {
+          "output": {
+            "additionalProperties": false,
+            "properties": {
+              "done": {
+                "$ref": "#/$defs/__schema0"
+              },
+              "items": {
+                "$ref": "#/$defs/__schema1"
+              },
+              "nextCursor": {
+                "$ref": "#/$defs/__schema3"
+              }
+            },
+            "required": [
+              "done",
+              "items"
+            ],
+            "type": "object"
+          }
+        },
+        "required": [
+          "output"
+        ],
+        "type": "object"
+      },
+      "toolName": {
+        "const": "ghostNewsletterList",
+        "type": "string"
+      }
+    },
+    "required": [
+      "ok",
+      "output",
+      "toolName"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "error": {
+        "additionalProperties": false,
+        "properties": {
+          "code": {
+            "enum": [
+              "AI_SCHEDULING_LIMIT_REACHED",
+              "AI_SCHEDULING_UNAVAILABLE",
+              "INVALID_INPUT",
+              "FORBIDDEN",
+              "NOT_FOUND",
+              "CONFLICT",
+              "FEATURE_DISABLED",
+              "CONFIRMATION_REQUIRED",
+              "CONFIRMATION_INVALID",
+              "UPSTREAM_FAILED",
+              "NEEDS_REVIEW",
+              "INTERNAL"
+            ],
+            "type": "string"
+          },
+          "message": {
+            "maxLength": 2048,
+            "minLength": 1,
+            "type": "string"
+          },
+          "retryable": {
+            "type": "boolean"
+          }
+        },
+        "required": [
+          "code",
+          "message",
+          "retryable"
+        ],
+        "type": "object"
+      },
+      "ok": {
+        "const": false,
+        "type": "boolean"
+      },
+      "toolName": {
+        "const": "ghostNewsletterList",
+        "type": "string"
+      }
+    },
+    "required": [
+      "error",
+      "ok",
+      "toolName"
+    ],
+    "type": "object"
+  }
+]

First observedOct 11, 2026

TDQS

A4.1/5.0

Behavior4/5

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

Annotations already declare readOnly/idempotent/non-destructive, so the safety profile is covered. The description adds genuinely new behavioral context the annotations omit: that selecting a newsletter triggers email sends on article publish, plus the account-ownership and provider-availability constraints. This is valuable disclosure beyond structured data.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Three tight sentences, front-loaded with what the tool returns, followed by prerequisites and pagination. Every sentence carries information, with only minor redundancy around the cursor guidance already implied by the schema.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Covers purpose, preconditions, pagination, and a hidden side effect, and an output schema exists so return values need no explanation. Nothing critical is missing for correct invocation, though the reference to non-existent 'search fields' is a small inconsistency.

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 coverage is 100%, so both parameters are already documented in the schema, and the baseline is 3. The description references 'nextCursor' and 'search fields', but no search-field parameter exists here, so it adds little beyond restating cursor semantics and introduces a slightly off-target detail.

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+scope ('List active newsletters') that immediately distinguishes it from sibling list tools like ghostAuthorList, ghostTagList, and ghostTierList. An agent can tell what it retrieves without opening the schema.

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?

Gives real preconditions ('Requires an owned active account and current provider availability') and pagination instructions ('Follow nextCursor until done, keeping the same connection and search fields'). It stops short of naming an alternative tool or stating when not to use it, so it falls short of a 5.

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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