SEO GSC Wizard MCP

Detect traffic anomalies

detect_anomalies

Read-only

Flags statistically anomalous days in a property's Search Console series for a chosen metric (clicks, impressions, CTR, or position). Uses a robust Modified Z-score with median absolute deviation and day-of-week baselines (mean absolute deviation when most days are identical, as on a low-traffic property), then scores each spike/drop by severity (critical → info). Days without rows count as zero for clicks and impressions, so a drop to zero (deindexing) is flagged; the 21-day minimum is measured in calendar days from the first day with data. CTR and position use only days with impressions. coverage reports the days analysed and how an empty tail at the end of the window was treated. Good for "did something break / spike on a specific day?". Reads the ClickHouse warehouse when available, else the live Search Console API.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`days`	No	Trailing days of daily data to analyze (min 21, default 90).
`metric`	No	Which metric to scan for anomalies.	clicks
`siteUrl`	Yes
`sensitivity`	No	Modified Z-score threshold: lower = more sensitive (more anomalies). Default 3.5; 3-4 is typical.

Output Schema

TableJSON Schema

Name	Required	Description	Default
`note`	No
`range`	No
`metric`	No
`siteUrl`	No
`summary`	No
`coverage`	No
`anomalies`	No
`dataSource`	No
`sensitivity`	No
`dataMaturity`	No
`settledThrough`	No
`warehouseLatestDate`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed2 schema fields changedOct 10, 2026

addedOutput schema / properties / coverage

Added value: +{
+  "anyOf": [
+    {
+      "additionalProperties": false,
+      "properties": {
+        "calendarDays": {
+          "$ref": "#/properties/sensitivity"
+        },
+        "daysAnalyzed": {
+          "$ref": "#/properties/sensitivity"
+        },
+        "daysWithData": {
+          "$ref": "#/properties/sensitivity"
+        },
+        "firstDataDate": {
+          "$ref": "#/properties/siteUrl"
+        },
+        "lastDataDate": {
+          "$ref": "#/properties/siteUrl"
+        },
+        "trailingGap": {
+          "anyOf": [
+            {
+              "additionalProperties": false,
+              "properties": {
+                "lastDataDate": {
+                  "$ref": "#/properties/siteUrl"
+                },
+                "missingDays": {
+                  "$ref": "#/properties/sensitivity"
+                },
+                "note": {
+                  "$ref": "#/properties/siteUrl"
+                },
+                "status": {
+                  "$ref": "#/properties/siteUrl"
+                }
+              },
+              "type": "object"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "zeroFilledDays": {
+          "$ref": "#/properties/sensitivity"
+        }
+      },
+      "type": "object"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}

addedOutput schema / properties / warehouseLatestDate

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

First observedOct 7, 2026

TDQS

Score is being calculated.

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