Three surfaces, one source. The registry the proxy answers 410 from now
also emits the tombstones into `docs/api/openapi.yaml` and rides on
`GET /api/meta/capabilities`, so a retirement cannot be honoured at
runtime and invisible everywhere a client could have read it first.
The contract publishes each retired path with 410 as its only response,
the removing version, and the replacement. `deprecated: true` is
imprecise — the word means "still works, stop using it", and these do not
work — but it is what makes a generator warn at the call site, and the
description carries the exact truth the flag approximates. `security: []`
because the answer is produced before any handler and reads no
credential; publishing it as authenticated would tell a client to sign in
to be told a path is gone.
The capability read carries the same list. That surface is the one a
client already polls on launch, so a retirement can reach it before the
failing call rather than through it.
The coverage guard gains a third state. Published and exempted both
describe a route that exists, so removing one used to leave exactly one
legal move — erase it from the contract as well — and that move is
invisible to every client already calling it. A registered path is now
required to be absent from `src/app` AND present in the contract, which
is the one combination the phantom-path case rejected outright. Both ways
out are named in the failure message.
Its docblock says what the state cannot do, because the first draft
overclaimed: a check over one commit's state cannot see a deletion, so it
cannot insist that a removal should have been registered. Proving that
needs the previous release tag, and the job running this suite checks out
at depth one with no tags, which would make the check one that silently
cannot fail. What is held instead is the registration's integrity, in
three directions and with the mutation for each written down.
The sharing-denial guard learns the same state: a retired path resolves
no record fence because it reaches no handler.
The floor was described on the one route that cannot reach it and left unsaid
on the two that answer it every time: withdrawing the last Guardian grant and
renouncing it both raise `managed_profile.guardian.required`, and both
published only 'that access had already ended'. Both 409s now name their two
codes, and the annotation on the removal route enumerates all four emitters
rather than three.
A guard closes the class rather than the instance: every route module that
raises the refusal must publish it on its own operation, with the emitters
discovered from the sources.
The freeze guard gains its containment leg — a module becomes delegable by
review, not by discovery, so every file contributing a fenced verb has to be a
member of one of the surface guard's frozen allowlists.
Every route that resolves a record through the sharing fence can answer 403
`sharing.access.denied`, and until now that fact was published on the selector
header and on none of the 120 operations that produce it. All 120 carry it now,
byte for byte, from one constant: the refusal is deliberately indistinguishable
across a missing account, a missing grant, a scope that does not reach the
surface and a read grant on a write, so 120 paraphrases would invite a client to
tell apart what the server refuses to.
Where a delegable route already answered 403 for its own reason — a module
gate, the cycle gate, AI consent — the two share one description rather than one
of them going unpublished, since OpenAPI allows a single response per status.
The guard recomputes the delegable set from the route sources on every run and
classifies per verb, which matters: seventeen modules have a delegable read
beside a write that refuses a switch outright.
Marc-André Bombeck