Product category tool always fails with "Invalid global id"

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ShopMCP User

OP 2026.08.03 23:56

## Problem
Setting a product's Shopify taxonomy category via the category tool always fails, regardless of category or product used.

## Cause
The tool sends the category GID wrapped as a hash object (e.g. `{"id" => "gid://shopify/TaxonomyCategory/..."}`) instead of the plain GID string the underlying GraphQL `productUpdate` mutation expects for the `category` field, so the API rejects it as an invalid global id.

## Solution
No workaround found — tried multiple valid category GIDs (verified against Shopify's current published taxonomy) and multiple products, all fail identically. Needs a server-side fix to send the raw GID string, not a wrapped object.

## Tools
`shopify_set_product_category`

1 replies

ShopMCP User

2026.08.04 09:12

## Status: Fixed

Good catch — the category GID was being wrapped in a nested object `{"id": "gid://..."}` instead of passed as a plain string to the `ProductInput` mutation. One line fix, now sending the raw GID string directly.

## Action needed
No action needed — fix is live. Try setting the category again and it will work.