feat(derivatives): reader-facing status client for a derived scope

[maciejwitowski]

Every derivative question helper the SDK ships today is the builder's. registerQuestion, getQuestion, waitForQuestion and askPersonalServer all target /v1/derivatives/questions, which needs a write session — and a write session needs a write:<scope> grant entry.

The app that reads the answer usually has no write entry at all. A consent flow gives it a bare read on the derived scope, so it can never open a session. All it can call is GET /v1/data/<derivedScope>, which returns 404 for three different situations:

• the compute is still running
• it failed, and the server will retry
• it failed, and nothing more will happen

This adds the client for the route that answers that: GET /v1/derivatives/status?derivedScope= (personal-server-ts#238).

Reading the status

const status = await getDerivativeStatus({
  personalServerUrl: "https://ps.example.com",
  derivedScope: "coach.weekly",
  grantId,
  signer,
});
// { derivedScope, status, lastComputedAt, derivedVersion,
//   derivedCollectedAt, errorCode, retryAfterSeconds }

Authorization is the data read's: a live grant covering the derived scope sent as the signed grantId claim, or the owner with no grant at all. Nothing is served and nothing is charged, so a priced grant raises no 402 here.

The signature covers the bare path, /v1/derivatives/status, not the query. That is the same rule the data and lineage reads follow: per-scope authorization is enforced live on every request rather than pinned by the signature. Only the write path signs path and query, where a parameter decides what gets written.

Waiting for it

const settled = await waitForDerivativeStatus({
  personalServerUrl,
  derivedScope: "coach.weekly",
  grantId,
  signer,
  timeoutMs: 60_000,
});

Returns as soon as the scope is ready, or has failed with no retry pending. Two calls worth flagging:

• A failed status is returned, not thrown. The reader branches on errorCode. Throwing would force a try/catch around the ordinary case of "it did not work".
• The server's retryAfterSeconds beats pollIntervalMs. inference_unavailable is the one transient class and the server retries it at 1m/5m/30m. Nothing changes before that retry fires, so polling faster only spends requests. The remaining budget still caps each sleep.

isDerivativeStatusSettled is the same predicate, exported for callers running their own loop.

Error codes

DerivativeErrorCode is the closed vocabulary the server serves:

code	meaning
inference_unavailable	provider or relay failed (the server retries)
source_missing	a source scope is deleted or has no local data
grant_invalid	the registering builder's grant no longer covers
internal	anything else, including a permanent provider 4xx

It is also added to DerivativeQuestionSchema, so the builder's own view carries the class. Nullish, so a Personal Server that predates the field still parses.

The view is lifecycle only. The question text, the source scopes, the question id, the registrar and the server's raw error string never reach the reader — a test asserts the served key set and that neither the source scope nor the question id appears anywhere in it.

Testing

npm run typecheck, npm run lint, npm run format:check, npm run test:coverage all pass. 1174 tests, 71 files, 0 failures. CI green on Node 20 and 22.

20 new tests cover the request shape (path-only signature, grant in the envelope, encoded query), each lifecycle state, the owner path with no grant, 403 for an uncovered scope and for a signer with no grant, 404 for a covered scope with no question, the disclosure assertion, transport and unparseable-body failures, and the wait loop (polls to ready, returns a terminal failure, waits through a retrying one, honours retryAfterSeconds, times out, aborts).

The mock Personal Server gained the route with the real authorization model — read grant or owner, never the write-session path — plus the precedence rule among duplicate registrations and the two new fields.

The request shape is checked against the server, not just the double: personal-server-ts signs its own status tests as uri: "/v1/derivatives/status" with grantId in the Web3Signed envelope, byte-for-byte what this client sends.

Merge order

Needs a Personal Server that ships the route. An older one answers 404 for the route itself, which surfaces as DerivativeQuestionNotFoundError — the same error as a covered scope with no question behind it. Consumers pin the Personal Server by exact version, so this is only usable after that release and a bump in each surface.

One repo note, unrelated to this diff

.husky/pre-push is broken on main. It calls install-evm-key-scan-hook.sh run, but the stub that replaced the old script (#194) accepts only install|status|uninstall and exits 2 on anything else — and status refuses the repo outright because husky sets core.hooksPath. Every local push fails until it is fixed.

This branch was pushed with --no-verify after running the hook's own checks by hand (typecheck and test:coverage, both green) and grepping the diff for key material. There is none: the test accounts come from generatePrivateKey() at runtime. CI's evm-key-scan passed independently.

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🎉 This PR is included in version 3.22.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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