Compare segment movement

Use segment-impact after a property-level change is visible and you need to find which pages, queries, countries, or devices moved. It compares equal-length adjacent finalized GSC windows. The report deliberately limits conclusions to segments retained in both windows, so its deltas are comparable without inventing zeros for rows that disappeared from one retained result set.

Run the report

With MCP, call seo_list_reports with {"category":"diagnosis"}, then seo_describe_report with {"id":"segment-impact"}. Then call seo_run_report with the described report, for example {"id":"segment-impact","params":{"site":"sc-domain:example.com","dimension":"page","days":28,"compareDays":28,"limit":20,"maxRows":50000,"unmatchedLimit":10}}.

The CLI uses the same schema: