We gave 44 page-head tasks to Sonnet and Haiku. Valid syntax hid a made-up currency, a self-awarded rating and an unsupported language code.
Two kinds of markup sit in a page head for search engines alone: JSON-LD, which describes the page, and hreflang, which links its language versions. A model asked to write either one tends to produce something that looks finished and passes every syntax validator, yet contains a value the page never stated or a code Google does not accept. In our tests the damage was small in count and sharp in kind: a currency nobody mentioned, a star rating a clinic gave itself, a language code Google names as unsupported. Below are the method, the exact answers, why each one matters, and a checklist for your own pages.
Read the full report on AISkills402: https://aiskills402.com/blog/json-ld-hreflang-models-get-wrong?utm_source=devto&utm_medium=social
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