Dev adds Google Merchant Center to his MCP server — and explains how it beats Google's official one
DutchSEOnerd · reddit · 2026-10-16
The indie dev behind GSC Wizard added Google Merchant Center to his SEO MCP server — 10 shopping tools demoed end-to-end with 8 prompts on a sample shop.
Coverage: free-listing performance across Shopping/Search/Images/Lens/YouTube/Maps, products Google won't show ranked by click potential, competitor visibility per country/category, price benchmarks with suggested prices, best sellers you don't stock, a 21-check feed audit, and Search Console's merchant listings report.
Vs. Google's official MCP (Merchant API MCP Access Service, since May 2026): Google's has 13 tools, writes, and raw MQL via reportsearch — better for developers, but it's an experimental alpha with fussy setup (Cloud project, OAuth token, headers). His is a hosted connector with normal sign-in in Claude/ChatGPT, and it hands the model pre-digested answers instead of raw rows.
Hard-won lessons for MCP builders
- Google has no read-only Merchant Center scope — consent says "manage", so tool annotations must declare read-only
- Search Console and Merchant Center counts never reconcile; responses embed a note telling models to compare trends, never totals
- getproductlistingstatus returns whole-catalog summary counts on the first call, paging 200 rows only when needed
- Merchant API refuses all calls until the merchant registers your Cloud project — handled with an in-app button
Endpoint: mcp.gscwizard.com/mcp, OAuth 2.1; paid product with a 7-day trial.
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