What the generator refuses

It fails at client.init() — not on a request in production — naming the endpoint and the path that caused it, and pointing at document. Guessing would produce a query the server rejects at runtime, which is strictly worse.

Schema	Why
`z.union([...])` of objects	needs inline fragments (`... on Type`), and the schema does not say which types
`z.record(...)`	GraphQL has no way to ask for "every field"
recursive schemas	a query must be finite; the depth is a decision only you can make
variables with no `root`	there is no single field to attach the arguments to

Give those endpoints an explicit document; everything else about them still works, including validation against response.

Not supported

Subscriptions (use @tahanabavi/typesocket), @defer / @stream, persisted queries, and file uploads via the multipart spec.