Previous value: -"Output for the sm_list_campaigns tool. Failure payloads arrive in the same envelope as { error, message, code }."New value: +"Output for the sm_list_campaigns tool. Failure payloads arrive in the same envelope as { error, code }."

Added value: +"Campaign rows with performance metrics."

Added value: +"Stable identifier for a Mailchimp campaign. Use it to join rows across tools or drill into sm_get_campaign."

Added value: +"Unique clicks divided by delivered, as a percentage from 0 to 100."

Added value: +"Number of emails the campaign attempted to send to recipients."

Added value: +"Unique opens divided by delivered, as a percentage from 0 to 100."

Added value: +"The campaign subject line as sent."

Added value: +"Opaque keyset pagination cursor returned as `nextCursor` by the previous page. Must be replayed with identical query filters."

Added value: +"Inclusive ISO-8601 calendar date (UTC) upper bound for the time range in YYYY-MM-DD format. Omit to leave the end of the time window unbounded or use the endpoint's default."

Added value: +"Maximum number of emails sent to include the campaign in the results. Omit to impose no upper bound."

Added value: +"Minimum number of emails sent to include the campaign in the results. Omit to use the system default threshold."

Added value: +"Maximum number of rows to return per page. Omit to use the default page size of 100. MCP tool calls are capped at 100 rows per page to protect the model's context window."

Added value: +"Required. The opaque alphanumeric project identifier of 8 or more characters to scope this request to. Call GET /_api/public/v1/enterprise/projects to list the project IDs available to your API key. Omitting it returns 400 VALIDATION_ERROR."

Added value: +"Filter campaigns by a case-insensitive partial match on the subject line or specific internal campaign IDs. Omit to skip text filtering."

Added value: +"The field used to order the campaigns list. Defaults to sorting by the most recent send time first."

Added value: +"The direction to sort the campaign results. Can be 'asc' for ascending or 'desc' for descending. Defaults to \"desc\" when omitted."

Added value: +"Inclusive ISO-8601 calendar date (UTC) lower bound for the time range in YYYY-MM-DD format. Omit to leave the start of the time window unbounded."

Previous value: -nullNew value: +{
+  "additionalProperties": true,
+  "description": "Output for the sm_list_campaigns tool. Failure payloads arrive in the same envelope as { error, message, code }.",
+  "properties": {
+    "campaigns": {
+      "items": {
+        "additionalProperties": true,
+        "description": "General campaign list view row.",
+        "properties": {
+          "campaignId": {
+            "type": "string"
+          },
+          "clickRate": {
+            "type": "number"
+          },
+          "emailsSent": {
+            "type": "integer"
+          },
+          "openRate": {
+            "type": "number"
+          },
+          "sendTime": {
+            "description": "ISO 8601 UTC timestamp.",
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "subjectLine": {
+            "type": "string"
+          }
+        },
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "code": {
+      "description": "A machine-readable identifier for the error type. For the full code taxonomy, see the sm_get_schema tool or the Enterprise API OpenAPI ErrorResponse component.",
+      "type": "string"
+    },
+    "error": {
+      "description": "A human-readable error message detailing what went wrong.",
+      "type": "string"
+    },
+    "hasMore": {
+      "description": "True if additional results exist beyond this page.",
+      "type": "boolean"
+    },
+    "nextCursor": {
+      "description": "A keyset cursor marking the continuation point. Contract: this value is non-null if and only if `hasMore` is true. Clients MUST echo this token verbatim on the subsequent request and MUST NEVER attempt to parse or manually construct it.",
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "pageSize": {
+      "description": "The maximum number of items returned in this page.",
+      "type": "integer"
+    },
+    "projectId": {
+      "description": "An opaque alphanumeric project identifier of 8 or more characters identifying a Space Monkey Project. Treat this value as entirely opaque; do not parse, sequentialize, or auto-generate it.",
+      "type": "string"
+    }
+  },
+  "type": "object"
+}