Signal
Product identity and canonical URL
Whether each product has one stable canonical URL matching the feed link plus real manufacturer identifiers, so an agent can match your item to the same product across competing stores.
Per-platform status
Where a platform documents relevant behavior, its status and source are shown. Undocumented platforms show "unknown" - honest unknowns, never invented.
| Platform | Status | Notes | Source |
|---|---|---|---|
| ChatGPT | Supported | The feed requires a stable item_id and a product url, and supports gtin with a valid check digit, mpn, brand and group_id for variants. | Source (opens in new tab) · verified 2026-09-18 |
| Gemini / Google AI Mode | Supported | link must be the canonical landing page, and gtin, mpn and brand are required or strongly recommended so Google can match the item across sellers. | Source (opens in new tab) · verified 2026-09-18 |
| Perplexity | Unknown | Not documented by this platform. | - |
| Copilot | Supported | The feed requires link to match the store domain and not redirect, and requires gtin, mpn or brand where the manufacturer assigns them. | Source (opens in new tab) · verified 2026-01-02 |
| Claude | Unknown | Not documented by this platform. | - |
Evidence and sources
This signal is typed spec-fact (Very high confidence).
- Merchant listing structured data (opens in new tab) · 2026-07-08
- Product data specification (opens in new tab) · 2026-07-08
How to act on this
Give each product one canonical URL that resolves to the purchasable page and matches the feed link, and populate gtin/brand/mpn wherever a real identifier exists (never invent one).
Related checklist items
Handbook chapters