GMCThe Google Merchant Center CLI

Validate feeds offline, diagnose the silent setup trap, and move off the retired Content API — one typed CLI, built for CI.

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CLI reference

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Typed Merchant API

A typed client for the stable Merchant API surface, including the August 2026 Loyalty Customers GA API. Rate limiting, retry/backoff, and pagination are built in, so you don't hand-roll them.

gmc doctor

Diagnoses the silent GCP-registration / API-not-enabled trap that quietly breaks Merchant API access.

Offline preflight

gmc preflight scans your feed for required-attribute, format, disapproval-trigger, and SEO-optimization issues locally — no API call — so you catch a rejection before upload.

Content API → Merchant API

gmc migrate moves you off the retired Content API — scope/auth audit, product transform (price→micros, field remap), and a feed-label safety check.

Feeds as code

Pull your product catalog to version-controllable JSON, review the diff, and push it back. Your product feed lives in Git.

GitHub Action

The first-party GitHub Action (uses: yasserstudio/gmc@v1) runs preflight in CI with inline PR annotations on diffs, a findings summary table in the Actions tab, and structured outputs for downstream steps.

MCP server

gmc mcp exposes 12 tools over the Model Context Protocol — products, preflight, diagnostics, and more — so AI assistants like Claude Desktop, Cursor, and VS Code Copilot can work with your Merchant Center data.

Built for CI

Block a bad feed from shipping: every command speaks --json and returns a classed exit code, so a GitHub Action or GitLab job can fail the build on a disapproval or a performance drop.

🚀 GMC v1.1.0 is live — all 13 stable Merchant API sub-APIs are covered, including Loyalty Customers, with the August 2026 product, inventory, account, quota, and data-source contracts. See the release →