Three consent-surface tests mocked the shared AI-consent bucket at 60 where it
is 20, and the analytics-read and MCP mocks named 60 against real caps of 120.
Nothing asserts the number today, so nothing was wrong on the wire — but the
mocked verdict now carries `limit` all the way to `X-RateLimit-Limit`, and the
first test that reads that header off a mock would pin the fiction.
The response-shape file's header pointed at a document that is not in the
repo; it says what it means directly instead. It also now records the one
thing the gate cannot see: `meta` is a loose object on purpose, so undeclared
keys inside it survive the parse and the strip comparison does not reach them.
Response drift was structurally undetectable. `openapi:check` proves the
YAML matches the registry and the route-coverage guard proves the verb is
listed; both pass when the registered schema disagrees with what
`apiSuccess()` sends, and the coverage guard says so in its own doc
comment. That is how `/api/sync/changes` shipped five domains against a
three-domain contract and how the error envelope went years without
declaring the field the multi-issue 422 was built for.
Two bodies, the two that were broken: a full `/api/sync/changes` page
with live and soft-deleted rows in all five domains, its `cursorExpired`
short-circuit (a second shape under the same schema), and a 422 carrying
more than one issue.
`safeParse` alone would not have caught either finding, because Zod
strips undeclared keys instead of refusing them — a schema short of the
wire parses cleanly. So the parsed value is compared back to the raw
body; a strip means the contract is missing something the server sends.
Removing `cycleDays` / `cycles` from the sync schema, or `details` from
the envelope, fails all three cases.
Marc-André Bombeck