SEO GSC Wizard MCP

GA4 custom dimension breakdown

query_ga4_custom_dimensions

Read-only

Breaks GA4 traffic down by ONE custom dimension registered on the property linked to a site (the site's own event parameters or user properties, e.g. customEvent:source_format), optionally CROSSED with a second dimension - which is how a question like "which article sent how many readers to which page" is answered: primary customEvent:source_path, secondary customEvent:target_path, filtered to the one event that carries them. Metrics per row are eventCount, sessions, activeUsers and keyEvents, plus any registered custom metrics asked for. Run list_ga4_custom_dimensions first for the exact names; an unregistered name is rejected here rather than silently returning an empty report. Returns a notConfigured result (not an error) when Google Analytics is not connected or no GA4 property is linked. Date range is optional: omit startDate/endDate to analyze the last 28 settled days (data lags ~2-3 days).

Input Schema

TableJSON Schema

Name	Required	Description
`limit`	No	Maximum number of breakdown rows returned.
`endDate`	No	Optional. Window end as YYYY-MM-DD (e.g. 2026-05-31). You do NOT need to know today's date or the latest available date: omit this and the server uses the latest settled Search Console date (data lags ~2-3 days behind today). Never pass null or the string "null".
`filters`	No	Optional GA4 dimension filters applied to every report in the call. Within a list field the values OR together; different fields AND together. Omit entirely for unfiltered data.
`siteUrl`	Yes
`dimension`	No	apiName of the custom dimension to break down by, from list_ga4_custom_dimensions (e.g. customEvent:source_format). Omit to use the property's first registered custom dimension; the response reports the choice.
`startDate`	No	Optional. Window start as YYYY-MM-DD (e.g. 2026-05-03). You do NOT need to know today's date. Omit BOTH startDate and endDate to analyze the last 28 settled days automatically (Search Console data lags ~2-3 days). Never pass null or the string "null".
`valueFilters`	No	Narrow the whole report to rows whose custom dimension matches a value - the way to drill from "every source_path" into "the target pages of ONE source_path". Filters AND together.
`customMetrics`	No	Up to 3 registered custom METRIC apiNames to add as extra columns (from list_ga4_custom_dimensions metricNames).
`comparisonEndDate`	No	Optional. End of the comparison period as YYYY-MM-DD. Provide BOTH comparison dates to compare two periods; omit both for no comparison (prev* fields are then 0 and hasComparison false).
`secondaryDimension`	No	Optional second dimension to cross the first with, producing one row per PAIR of values. Either another custom dimension apiName, or one of: eventName, pagePath, landingPage, sessionDefaultChannelGroup, sessionSourceMedium, country, deviceCategory.
`comparisonStartDate`	No	Optional. Start of the comparison period as YYYY-MM-DD. Provide BOTH comparison dates to compare two periods; omit both for no comparison (prev* fields are then 0 and hasComparison false).

Output Schema

TableJSON Schema

Name	Required	Description
`hint`	No
`note`	No
`rows`	No
`range`	No
`reason`	No
`account`	No
`metrics`	No
`siteUrl`	No
`summary`	No	Metric totals keyed by GA4 metric name.
`rowCount`	No
`timeZone`	No
`dimension`	No
`siteScope`	No
`totalRows`	No
`truncated`	No
`dataSource`	No
`propertyId`	No
`prevSummary`	No
`hasComparison`	No
`notConfigured`	No
`reauthRequired`	No
`comparisonRange`	No
`availableMetrics`	No
`secondaryDimension`	No
`availableDimensions`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed2 schema fields changedOct 10, 2026

changedInput schema / properties / filters / properties / hostName / description

Previous value: -"GA4 hostName values, matched exactly (any of), e.g. [\"www.example.com\"]. When the linked GA4 property is shared with other sites, results are already limited to this site's hostnames (see `siteScope` in the response); setting hostName replaces that automatic scope, e.g. to read another stream or several hosts at once."New value: +"GA4 hostName values, matched exactly (any of), e.g. [\"www.example.com\"]. When the linked GA4 property is shared with other sites, results are already limited to this site's hostnames (see `siteScope` in the response). For the property owner, setting hostName replaces that automatic scope, e.g. to read another stream or several hosts at once; on a property shared with you it only narrows within the scope."

addedOutput schema / properties / reauthRequired

Added value: +{
+  "$ref": "#/properties/hasComparison"
+}

Changed6 schema fields changedOct 7, 2026

addedInput schema / properties / filters / properties / hostName

Added value: +{
+  "description": "GA4 hostName values, matched exactly (any of), e.g. [\"www.example.com\"]. When the linked GA4 property is shared with other sites, results are already limited to this site's hostnames (see `siteScope` in the response); setting hostName replaces that automatic scope, e.g. to read another stream or several hosts at once.",
+  "items": {
+    "maxLength": 256,
+    "minLength": 1,
+    "type": "string"
+  },
+  "maxItems": 300,
+  "type": "array"
+}

changedOutput schema / properties / availableDimensions / $ref

Previous value: -"#/properties/metrics"New value: +"#/properties/siteScope/anyOf/0/properties/hostnames"

changedOutput schema / properties / availableMetrics / $ref

Previous value: -"#/properties/metrics"New value: +"#/properties/siteScope/anyOf/0/properties/hostnames"

addedOutput schema / properties / metrics / $ref

Added value: +"#/properties/siteScope/anyOf/0/properties/hostnames"

removedOutput schema / properties / metrics / anyOf

Removed value: -[
-  {
-    "items": {
-      "type": "string"
-    },
-    "type": "array"
-  },
-  {
-    "type": "null"
-  }
-]

addedOutput schema / properties / siteScope

Added value: +{
+  "anyOf": [
+    {
+      "additionalProperties": false,
+      "properties": {
+        "hostnames": {
+          "anyOf": [
+            {
+              "items": {
+                "type": "string"
+              },
+              "type": "array"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "includesSubdomainsOf": {
+          "$ref": "#/properties/siteUrl"
+        },
+        "note": {
+          "$ref": "#/properties/siteUrl"
+        },
+        "sharedWithSites": {
+          "$ref": "#/properties/siteScope/anyOf/0/properties/hostnames"
+        }
+      },
+      "type": "object"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}

First observedOct 7, 2026

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