ng-eventually/docs/api-contract.md

# API contract — what `@ng-eventually/sdk` exposes today, and what the future SDK should expose per subject

> **Updated 2026-08-03, after the source layout was reorganised by migration fate** (`docs/source-layout-by-fate.md`). Paths, and three names, changed under this document: `readModel` became the directly-exported `readUnion`; `accounts` / `AccountRecord` / `AccountStorage` became `virtualUsers` / `VirtualUserRecord` / `VirtualUserStorage` (module `shared-wallet/virtual-users.ts`); `store-registry-api.ts` became `surface/placement.ts`. Two modules were created and are covered here: `emulated-verifier/branch-registers.ts` (the four durable registers, split out of the shim) and `shared-wallet/bootstrap.ts` (the injection store, split out of the `/polyfill` entry). The subject-by-subject rulings below are unaffected — what moved is where the code lives, not what it promises.

**Scope: the APP-FACING contract only.** Everything reachable from the two published entry points, and nothing else. The library's internal modules — the shim machinery, the read paths, the boundary guards — are held to the same standard (as close as possible to what NextGraph does or plans) but have their own document, `docs/internal-contract.md`: a consumer never reads that one, a maintainer does. This split was made on 2026-08-03, together with the export change described in § 15.

**Scope.** The real exported surface of `@ng-eventually/sdk` (verified against the `export` statements in `packages/sdk/src/index.ts` and `packages/sdk/src/polyfill.ts` — `package.json` maps exactly two entry points, `.` and `./polyfill`), and, for each subject, the target signature the future NextGraph JS SDK is expected to expose. Written 2026-08-03, verified against the `nextgraph-rs` clone (HEAD `213338f6`, 2026-05-16) and the installed `@ng-org/web@0.1.2-alpha.13` type declarations (`node_modules/.bun/@ng-org+web@0.1.2-alpha.13/node_modules/@ng-org/web/dist/index.d.ts`, hereafter `index.d.ts`).

**How to read the epistemic labels.** Every target-side claim carries one of:

- **PASSTHROUGH (level 3 / level 2, VERIFIED)** — the target function exists today; the lib forwards to it. Citation into `nextgraph-rs` or the installed `.d.ts`. Level numbers per `README.md` § *The three references*: 3 = JS ORM (`sdk/js/orm`), 2 = wasm binding / `@ng-org/web` (`sdk/js/lib-wasm`, `sdk/js/web`), 1 = Rust engine (`engine/`).
- **LEVEL-1 SHAPE (model VERIFIED, JS surface ASSUMED)** — the engine's model constrains the shape and is cited, but **no JS surface exists at any level**, so the signature offered here is this library's invention. The future SDK's name and parameter order for it are unknown.
- **ASSUMPTION** — nothing at any layer constrains this; the bet and what bounds it are stated.
- **NO COUNTERPART** — the subject has no image in the target at any layer, usually because it is shared-wallet machinery that disappears at migration. That is a finding about the emulation, not a gap in the target.

Per the design principle (`README.md` § *Design principle*): an absent implementation is never treated as evidence about the future — "the engine does not do X" and "the SDK will not offer X" are kept apart throughout.

---

## 1. Bootstrap and configuration

### Today — `@ng-eventually/sdk` (the POLYFILL-ERA block of `src/index.ts`; everything here is removed at migration)

```ts
// all from shared-wallet/bootstrap.ts
export interface EventuallyConfig {
  ng: NgLike;
  useShape: UseShapeLike;
  sharedWallet?: SharedWalletConfig;   // the gate's, § 2bis
  currentUser?: PrincipalId;
  debugAccessLog?: boolean;
  init?: (...args: any[]) => any;
  initNg?: (...args: any[]) => any;
}
export function configure(c: EventuallyConfig): void;

export interface StoreRegistryDeps {
  getSession: () => Promise<RegistrySession>;
  normalizeId?: (id: string) => string;
  pointerGuard?: { attempts?: number; baseMs?: number; maxStepMs?: number };
}
export function configureStoreRegistry(deps: StoreRegistryDeps): void;

// NOT published (2026-08-07, with the entry merge) — merging the two doors made
// publishing these a visible choice rather than an inherited one, and the choice is no:
//   getConfig, getStoreRegistryDeps   internal wiring; the surface reaches them by import
//   resetConfig, resetStoreRegistry   test resets; the suite reaches them the same way
```

### Target

**NO COUNTERPART, by design.** The whole subject is the polyfill bootstrap: it exists to inject the real SDK without a hard import (build-alias safety). At migration the consumer initializes the real SDK directly, with the two calls in § 2, and `configure` / `configureStoreRegistry` are deleted (`docs/migration-guide.md` § 7). Nothing in the target takes an "injected `ng`".

---

## 2. Lifecycle

### Today — `@ng-eventually/sdk`

```ts
// lifecycle.ts:11 — forwards to the real @ng-org/web init injected at configure()
export function init(...args: any[]): any;
// lifecycle.ts:18 — forwards to the real @ng-org/orm initNg injected at configure()
export function initNg(...args: any[]): any;
```

### Target

**PASSTHROUGH, VERIFIED at both levels.** The wrapper's `...args: any[]` is deliberately shapeless; the real signatures it forwards to are:

```ts
// level 2 — @ng-org/web: index.d.ts:108, source sdk/js/web/src/index.ts:51
export declare const init: (callback: Function | null, singleton: boolean, access_requests: any) => Promise<void>;

// level 3 — @ng-org/orm: sdk/js/orm/src/connector/initNg.ts:51 (exported as initNg from core.ts)
export function initNgSignals(ngImpl: NG, session: Session): void;

// level 2 — the Session initNg consumes: index.d.ts:264-272
export declare type Session = {
  session_id: string | number;
  protected_store_id: string;
  private_store_id: string;
  public_store_id: string;
  ng: typeof NGModule;
  [key: string]: unknown;
};
```

Divergence: none in behaviour (pure forwarding), but the wrapper erases the parameter types. A consumer typing calls against the wrapper learns nothing it must unlearn — it just gets no compile-time help the real SDK would give.

---

## 2bis. The access gate — `ensureIdentity`

### Today — `@ng-eventually/sdk`

```ts
export async function ensureIdentity(): Promise<void>;       // shared-wallet/access-gate.ts
export interface SharedWalletConfig { fileUrl: string; password: string; importUrl?: string }
```

One call, before the application renders. It resolves the identity from the URL (`?ng-id=`), failing that from browser storage, and only if neither answers does it show a barrier: download the shared wallet, here is its password, import it once, and name your space.

### Target

**NO COUNTERPART in substance, and a surviving CALL SITE — this section exists because those two are not the same thing.**

The substance is pure scaffolding. Every step it performs exists only because one wallet hosts several identities: upstream a user opens THEIR wallet, it contains THEIR site (`SensitiveWalletV0.personal_identity()`, `engine/wallet/src/types.rs:576-579`), and `session_start(wallet_name, user_id)` takes an id that came FROM the wallet. There is nothing to name and nothing to choose. The step that takes an identifier is the one that inverts the model, and it is the reason the whole gate is scaffolding.

The call site is a different matter. An application still has to wait for a session before it renders, and that will still be one awaited call at the same place. So the signature was designed to survive: **it takes no identifier**, deliberately — naming one is the part that disappears, so it must not appear in the parameters. The day the wallet supplies the identity, `ensureIdentity` resolves without showing anything and the caller's line is unchanged.

What a consumer must NOT conclude:

- that it may pass an identity in (it cannot — that is the point);
- that the barrier is a product screen. It is a technical gate, rendered in plain DOM inside a shadow root so no application stylesheet reshapes it and its own leaks nowhere. It is deliberately not bound to a UI framework: a screen that is going away must not make every consumer adopt one.
- that `SharedWalletConfig` describes a user setting. It describes what a DEPLOYMENT hands out, and it disappears with the gate. The library reads no environment variable, ever — the application resolves these values at its own build and passes them.

Why it lives here and not in the consumer application: the first consumer had ~300 lines of it — a gate component, a screen, a wallet module, an identity context, three BDD features. That is code an application would have to delete, and worse, code that teaches its authors a model NextGraph does not have (*"I name my identity"*).

---

## 3. The `ng` object

### Today — `@ng-eventually/sdk`

```ts
// index.ts:55
export const ng: Record<string, any>;
// type re-export, index.ts:50
export type { NG } from "@ng-org/web";
```

`ng` is a `Proxy` (`ng-proxy.ts:10`) forwarding every property to the injected real `ng`, overriding exactly two things: `login` / `session_start` (currently a passthrough with a TODO for shared-wallet credentials) and `sparql_update` (the emulated write-cap guard, rejecting a write when a write policy governs the anchored document and the current user lacks the cap).

### Target

**PASSTHROUGH (level 2, VERIFIED).** `export declare const ng: NG` with `NG = typeof NGModule`, 77 exported members (`index.d.ts:136-231`). The surface is identical by construction — the proxy adds no member and removes none.

The two overrides:

- `session_start(wallet_name: string, user_id: any): Promise<any>` (`index.d.ts:276`) — target signature unchanged; only the emulated credential injection disappears.
- `sparql_update(session_id: any, sparql: string, nuri: any): Promise<any>` (`index.d.ts:297`) — target signature unchanged. The native enforcement the guard stands in for is the engine's permission model (`verify_perm`, `engine/repo/src/commit.rs:897`), which today is **called only from tests** (its enclosing `Commit::verify` has no runtime caller — see `docs/nextgraph-current-state.md` § *Author-signature verification*). That absence says nothing about the target: write permissions are the engine's declared model, so the guard's *behaviour* (a refused write) is target-shaped even though its *mechanism* (a JS-side check) is emulation. Known limit, documented in `README.md`: the guard fires only on this proxy, and the lib's own writers call the injected `ng` directly, so it is best-effort until P1b.

---

## 4. Reactive typed reads — `useShape`

### Today — `@ng-eventually/sdk`

```ts
// use-shape.ts:12
export function useShape(shapeType: unknown, scope: unknown): unknown;
// type re-exports, index.ts:48-49
export type { ShapeType, BaseType, Schema } from "@ng-org/shex-orm";
export type { DeepSignalSet } from "@ng-org/alien-deepsignals";
```

Behaviour: forwards to the injected real `useShape`; once any emulated cap exists (`caps.isEnforcing()`), the returned set is wrapped in a read-filtered view keeping only items whose document cap the current holder has.

### Target

**PASSTHROUGH (level 3, VERIFIED), with a signature the wrapper widens.** The real hook:

```ts
// level 3 — @ng-org/orm/react: sdk/js/orm/src/frontendAdapters/react/useShape.ts:86-124
const useShape = <T extends BaseType>(
    shape: ShapeType<T>,
    scope: Scope | string | undefined
) => DeepSignalSet<T>;

// its Scope — sdk/js/orm/src/model/types.ts:25-38 (NOT this lib's Scope, see § 12)
export type Scope = {
  graphs?: string[] | string;
  subjects?: string[];
};
```

The read filter disappears at migration: in the target, isolation is cryptographic — a repo whose cap the wallet does not hold is never decrypted, a union read over it yields nothing, and a targeted read errors `RepoNotFound` (`engine/verifier/src/request_processor.rs:155,163` via `resolve_target`). VERIFIED at level 1; the *consumer-visible* result (you only see what you hold) is the same, which is the point of the emulation.

Divergence to note: the wrapper types everything `unknown`, losing the generic `T`. A consumer wanting typed sets today must cast; at migration the real generic signature gives it back. Nothing to unlearn, only ergonomics deferred.

---

## 5. Reactive typed reads with load state — `watchShape`

### Today — `@ng-eventually/sdk`

```ts
// watch-shape.ts:73
export interface ShapeQuery<T = UnionSubject> {
  data: T[];
  isPending: boolean;
  isSuccess: boolean;
  isError: boolean;
  error: unknown;
}
// watch-shape.ts:90
export interface ShapeObservable<T = UnionSubject> {
  getSnapshot(): ShapeQuery<T>;
  subscribe(onChange: () => void): () => void;
  refetch(): void;
}
// watch-shape.ts:166
export function watchShape<T = UnionSubject>(
  shapeType: unknown,
  scope: Scope,
): ShapeObservable<T>;
```

### Target

**Partly ASSUMPTION — flagged deliberately.** `surface/watch-shape.ts`'s header says it "anticipates NextGraph's planned `useShape(shape, scope)` upgrade, which will natively distinguish 'sync in progress' from 'synced but empty'". **No provenance for that plan exists in this repo's docs or in the `nextgraph-rs` clone** — treat the "planned upgrade" as an assumption, not a stated NextGraph direction. What IS verified at level 3 is that the distinction is *expressible* today, just not through the hook:

```ts
// level 3, VERIFIED — sdk/js/orm/src/connector/GraphOrmSubscription.ts:228,260,274
OrmSubscription.getOrCreate<T extends BaseType>(shape: ShapeType<T>, scope: NormalizedScope): OrmSubscription<T>;
get readyPromise(): Promise<void>;   // resolves when the subscription is synced — the native "no longer pending" signal
public close(): void;
```

So the constraint on the bet: the target can already answer "synced?" (`readyPromise`), and `useShape` today returns "an empty set, if still loading" (its own doc comment, `useShape.ts:29-31`) — indistinguishable from synced-empty. `watchShape` surfaces the distinction with a TanStack-`useQuery`-minimal vocabulary (`isPending`/`isSuccess`/`isError`), which is a **shape of this library's choosing**. If the future hook exposes load state under different names, the consumer's binding code changes; the underlying distinction it teaches (pending ≠ empty) is target-expressible and safe to learn.

---

## 6. One-shot listing — the read-model

### Today — `@ng-eventually/sdk`

```ts
// read-model.ts:59
export interface UnionSubject {
  subject: string;
  graph: string;
  props: Record<string, string[]>;
}
// read-model.ts:140
export async function readUnion(docs: Nuri[]): Promise<UnionSubject[]>;
```

Behaviour: one anchored `sparql_query` per doc (default-graph body, no `GRAPH` wrapper), parallel, per-doc failure tolerance, cap filter applied inside, machinery subjects dropped.

### Target

Two verified counterparts, one per level; neither returns `UnionSubject` — that grouping is lib-invented:

```ts
// level 2, VERIFIED — the primitive readUnion composes: index.d.ts:295, source sdk/js/lib-wasm/src/lib.rs:352 (nodejs) / :555 (web)
declare function sparql_query(session_id: any, sparql: string, base: any, nuri: any): Promise<any>;

// level 3, VERIFIED — the one-shot typed read: sdk/js/orm/src/connector/getObjects.ts:23
export async function getObjects<T extends BaseType>(
    shapeType: ShapeType<T>,
    scope: Scope | string
); // returns a deep-cloned Set of matching objects
```

The anchored-read mechanics are level-1 VERIFIED: an anchor restricts the query to that repo's graph as default graph (`resolve_target_for_sparql`, `engine/verifier/src/request_processor.rs:256-285`), an anchorless query unions every named graph in the session store (same function, `UserSite → None` → `set_default_graph_as_union`). At migration `readUnion` survives as composition (the anchored per-doc read is native); a consumer that wants typed results should be on `useShape`/`getObjects`, not on `UnionSubject` — the property-bag shape is a polyfill artifact, kept generic precisely so the consumer maps it into its own types and can drop it later.

---

## 7. Raw document / SPARQL primitives — `docs.*`

### Today — `@ng-eventually/sdk` (namespace `docs`)

```ts
// docs.ts:46
export async function docCreate(
  sessionId: string,
  crdt: string,
  cls: string,
  dest: string,
  store?: unknown,
): Promise<Nuri>;
// docs.ts:85
export async function sparqlUpdate(
  sessionId: string,
  query: string,
  anchor?: Nuri,
  label = "sparqlUpdate",
): Promise<void>;
// docs.ts:130
export async function sparqlQuery(
  sessionId: string,
  query: string,
  base?: string,
  anchor?: Nuri,
  label = "sparqlQuery",
): Promise<unknown>;
// docs.ts:113 — machinery, see § 15
export async function depositInto(
  sessionId: string,
  query: string,
  targetInbox: Nuri,
  label = "deposit",
): Promise<void>;
```

### Target

**PASSTHROUGH (level 2, VERIFIED)** — these mirror the real methods 1:1 minus the trailing `label` (a lib-internal access-log tag, never forwarded):

```ts
// index.d.ts:60 — the installed web SDK's doc_create
declare function doc_create(session_id: any, crdt: string, class_name: string, destination: string, store_repo: any): Promise<any>;
// index.d.ts:297
declare function sparql_update(session_id: any, sparql: string, nuri: any): Promise<any>;
// index.d.ts:295
declare function sparql_query(session_id: any, sparql: string, base: any, nuri: any): Promise<any>;
```

`depositInto` has **NO COUNTERPART as a SPARQL write**: upstream a deposit is a sealed message, not an update into the recipient's graph (§ 9). It exists only because the emulated inbox is an RDF document.

**Store targeting — finer than "not JS-constructible".** *(The other docs were corrected on 2026-08-03 to match this entry; they used to state the blanket form.)* Verified in the clone:

- The **web** wasm variant (`sdk/js/lib-wasm/src/lib.rs:1575`, `#[cfg(not(wasmpack_target = "nodejs"))]`) deserializes its 5th argument as `Option<StoreRepo>` via serde — so a value CAN be passed, but no JS helper exists to build the serde form, which keeps it out of practical reach. The published `.d.ts` documents this 5-arg form.
- The **nodejs** variant (`lib.rs:1618`, 6 args) takes `store_type: Option<String>` + `store_repo: Option<String>` and builds the store via `StoreRepo::from_type_and_repo(store_type, repo_id_str)` with `store_type ∈ "public" | "protected" | "private" | "group"` (`sdk/rust/src/local_broker.rs:2969-2987`, `engine/repo/src/types.rs:819-828`).

So the target's direction for scope placement is **already visible in the source** (level 2, VERIFIED, nodejs SDK): name the store by type + repo id strings. The migration-guide's anticipated `getNativeStore(scope)`-style resolver should expect to produce exactly that pair (or the serde `StoreRepo` once a web helper lands) — not a new concept.

---

## 8. Per-document subscription — `subscribeDoc`

### Today — `@ng-eventually/sdk`

```ts
// subscribe.ts:47,60,79
export type DocChange = unknown;
export type DocChangeType = string | undefined;
export type Unsubscribe = () => void;
// subscribe.ts:69
export function docChangeType(resp: DocChange): DocChangeType;
// subscribe.ts:104
export function subscribeDoc(
  nuri: Nuri,
  onChange: (r: DocChange, type: DocChangeType) => void,
): Unsubscribe;
// subscribe.ts:184
export function subscribeDocs(
  nuris: Nuri[],
  onChange: (nuri: Nuri, r: DocChange, type: DocChangeType) => void,
): Unsubscribe;
```

### Target

**PASSTHROUGH (level 2, VERIFIED) with two deliberate ergonomic deltas:**

```ts
// index.d.ts:66, source sdk/js/lib-wasm/src/lib.rs:1908
declare function doc_subscribe(repo_o: string, session_id: any, callback: Function): Promise<any>;
```

- The real call is `async` and resolves to an unsubscribe function; the wrapper returns the unsubscribe **synchronously** and honours an early cancel when the promise settles. A consumer coding against the sync return will keep working against the real SDK only through an adapter — a small, known unlearn, traded for not forcing `await` on every subscription site.
- The real callback receives one argument, the serialized `AppResponse` (`{ V0: { State | Patch | TabInfo | … } }`); the wrapper adds a second, pre-extracted `type`. `docChangeType` is a convenience over the verified payload shape (pinned by the e2e CONTRACT-3 probe), not an upstream API.
- `subscribeDocs` has **NO COUNTERPART and needs none**: it is client-side composition (a set of `doc_subscribe` with per-doc error isolation). The upstream fan-out primitive that looks like it (`orm_start_graph(graph_scope, …)`, `index.d.ts:243`) aborts wholesale on one `RepoNotFound` (`sdk/js/orm` → `engine/verifier/src/request_processor.rs:53-66`) — the reason this composition exists.

---

## 9. Inbox — deposits, and cap delivery

### Today — `@ng-eventually/sdk` (namespace `inbox`)

```ts
// inbox.ts:48,58
export interface Deposit {
  from: PrincipalId | null;
  payload: unknown;
  ts: number;
}
export interface PostOptions {
  from?: PrincipalId | null;
  payload: unknown;
  ts?: number;
}
// inbox.ts:140
export async function post(targetInbox: Nuri, opts: PostOptions): Promise<void>;
// inbox.ts:215
export async function postToDocument(doc: Nuri, opts: PostOptions): Promise<void>;
// inbox.ts:282
export async function share(doc: NuriLike, toUser: string): Promise<void>;
// inbox.ts:339
export async function read(targetInbox: Nuri): Promise<Deposit[]>;
// inbox.ts:419
export const materialize = read;
// inbox.ts:441
export async function readSynced(targetInbox: Nuri): Promise<Deposit[]>;
// inbox.ts:466
export async function processInbox(targetInbox: Nuri): Promise<Deposit[]>;
// inbox.ts:492
export function watch(
  targetInbox: Nuri,
  onDeposits: (deposits: Deposit[]) => void,
  _opts?: { intervalMs?: number },
): () => void;
```

### Target

**LEVEL-1 SHAPE throughout — the model is VERIFIED, every JS signature here is this library's invention.** There is no inbox method in `@ng-org/web` (none in the 77 `index.d.ts` exports, re-verified), and the verifier's dispatch has no `InboxPost` arm (arms actually handled listed at `engine/verifier/src/request_processor.rs:53-1444`, re-verified). The engine model that constrains the shape:

- An inbox is a keypair on **exactly one repo**: `pub inbox: Option<PrivKey>` (`engine/repo/src/repo.rs:126`); routing is `inboxes: HashMap<PubKey, RepoId>` on the verifier (`engine/verifier/src/verifier.rs:105`, looked up at `:1677`, inserted at `:1928`).
- A message is sealed to the inbox pubkey and carries **no target document** — `InboxMsgBody { to_overlay, to_inbox: PubKey, from_overlay: Option<OverlayId>, from_inbox: Option<PubKey>, … }` (`engine/net/src/types.rs:4265`). The address identifies the recipient repo; nothing else is needed. This is why `Deposit` has no document field and why `post` takes only the inbox NURI.
- `from` optional upstream (`from_inbox: Option<PubKey>`) — the "identified if known, anonymous otherwise" behaviour `PostOptions.from` mirrors, including the `null`-means-anonymous case.
- The recipient's own verifier unseals and **applies** queued messages when it processes its inbox (`engine/verifier/src/verifier.rs:1674-1690` → `process_inbox`); an inbox is a consumed queue, not a store you re-read.

Consequences per function:

- `post` / `postToDocument` — the sender-side act exists in the model (the broker routes `InboxPost` natively, `engine/net/src/server_broker.rs`); its JS surface does not. **The future SDK's name and signature are unknown** — `docs/nextgraph-current-state.md:187` records that nothing is announced. `postToDocument`'s resolution step (find the document's inbox address) rides on a **deliberate divergence**: this lib PUBLISHES the address on the document (Header-branch emulation), whereas upstream an address is only ever TRANSMITTED (`ContactDetails` carries `ng:site_inbox`/`ng:protected_inbox`, `engine/verifier/src/inbox_processor.rs:778-830`; the verifier's `inboxes` table is session-local, rebuilt empty — `verifier.rs:520,2820`). Documented in `docs/briefs/2026-08-03-document-inbox-addressing.md`.
- `share` — a **gap upstream, not a disagreement**, verified at both ends: `ContactDetails.read_cap: Option<ReadCap>` exists (`engine/net/src/types.rs:4233`) but building a message with it is `unimplemented!()` (`types.rs:3786`), its only caller passes `with_readcap: false`, and the receiving arm never reads the field (`inbox_processor.rs:778-830`). `InboxMsgContent::Link` is a **unit variant carrying nothing** (`types.rs:4252`) — do not read it as the delivery channel. The recipient-side filing the lib emulates is real: `AddLink { read_cap }` on the User branch (`engine/repo/src/types.rs:1939-1948`). The consumer's *act* (share one document's cap to one inbox) is target-shaped; only the transport is emulated.
- `read` / `materialize` / `readSynced` / `processInbox` / `watch` — **stand-ins for the recipient's own verifier processing**, which has no consumer-facing JS surface upstream and may never have this list-of-deposits shape. A consumer should treat "my inbox gets processed when I connect, and applied caps just appear in what I hold" as the durable contract (that is what `connectedUser` automates, § 13); code that leans on enumerating raw deposits as a mailbox UI is coding against emulation detail it may have to unlearn. The consumer-payload case (`Deposit.payload` as app data) maps to `InboxMsgContent` variants upstream (`types.rs:4249-4260`), of which only `ContactDetails` and `SocialQuery` are more than unit variants today — arbitrary app payloads through the inbox are an **ASSUMPTION**, constrained by the model only in that messages are sealed, per-recipient, and applied by the recipient.
- `watch`'s `_opts?: { intervalMs?: number }` is accepted and **ignored** (kept for signature compatibility with a removed polling watcher) — dead surface, see § 15.

---

> **Known divergence, low impact today — `inbox.share` always deposits on the recipient's PROTECTED inbox.** Upstream the choice follows the profile through which the person was reached (`a_or_b = if details.profile.is_public() { "site" } else { "protected" }`, `engine/verifier/src/inbox_processor.rs:787`). This library has no notion of "which profile I know this person by", so it picks one. It flattens a distinction the model makes; it will be wrong the day an application shares with someone met through a public profile. Recorded rather than fixed, because the fix needs a notion nothing here has established — note that the `Identity` enum that would name it is entirely commented out upstream (`engine/repo/src/types.rs:586-595`), so there is no profile model to read yet.

## 10. Capabilities — possession, not ACL

### Today

```ts
// @ng-eventually/sdk — model/types.ts. The types are the whole published cap surface.
export type Nuri = `did:ng:${string}`;
export type ReadCap = `did:ng:${string}:r:${string}`;
export type NuriLike = Nuri | string;

// NOT published, each deliberately:
//   isNuri / hasReadCap  — the type guards (`model/nuri.ts`). Unpublished since the
//     permissive-in change: every entry takes `NuriLike` and validates at the door, so
//     a consumer holding a plain string narrows nothing. Publishing a guard would
//     invite the cast it exists to prevent.
//   hasCap(doc)          — removed 2026-08-06. It read like "may I read this?", and a
//     document in a public store answers `false` until something asks for its cap.
//   getCaps / CapRegistry / resetCaps — the emulation's engine room and its test reset.

// INTERNAL — `emulated-verifier/caps.ts` (class CapRegistry). Never published; listed for the maintainer.
constructor(holder?: () => PrincipalId | null);
mint(nuri: Nuri): ReadCap;
learn(cap: ReadCap): void;
capFor(nuri: Nuri): ReadCap | undefined;
learnFromPublicStore(cap: ReadCap): void;   // a cap the public store SERVED — read only
isReadOnlyPublicCap(nuri: Nuri): boolean;
markInPublicStore(nuri: Nuri): void;
isInPublicStore(nuri: Nuri): boolean;
open(nuri: Nuri, scope: Scope): ReadCap;
isEnforcing(): boolean;
onChange(listener: () => void): () => void;
grantWrite(doc: Nuri, principal: PrincipalId): void;    // decorative until P1b
governsWrite(doc: Nuri): boolean;                        // decorative until P1b
canWrite(doc: Nuri, principal: PrincipalId | null): boolean; // decorative until P1b
hasWritePolicy(): boolean;                               // decorative until P1b
clear(): void;
```

### Target

**LEVEL-1 SHAPE.** There is no capability API at level 2 or 3 (no cap method in `index.d.ts`, none in the ORM), and there is **nothing to introspect upstream**: reading is key possession. The model, VERIFIED:

- A ReadCap is the serialized `ObjectRef` — `format!("r:{}", base64_url::encode(&ser))` (`BlockRef::readcap_nuri`, `engine/repo/src/types.rs:518-521`). The lib's `ReadCap` template-literal grammar (`…:r:{cap}`) is upstream's, with the stand-in constant `OK` in place of the key material (P1b swaps the value, not the shape).
- Caps live in two durable registers by origin: created documents → `AddRepo { read_cap }` on the store's Store branch (`engine/repo/src/types.rs:1890-1899`, committed by `doc_create` via `send_add_repo_to_store`, `engine/verifier/src/request_processor.rs:698`); received caps → `AddLink { read_cap }` on the private store's User branch (`types.rs:1939-1948`).
- The one path that loads a repo from a cap is `pub(crate)` — `Verifier::load_repo_from_read_cap` (`engine/verifier/src/verifier.rs:2237`) — unexposed to JS.

`capFor(nuri)` asks the only question the model admits — "do I hold this document's key?" — and returning `undefined` is the whole possible answer. There is no "may principal P read D?" anywhere, and the future SDK cannot offer one without inventing an ACL the engine does not have. That absence is a **finding about the target's model**, not a missing feature: a consumer should never expect a cap-introspection API.

The `CapRegistry` class itself is machinery (the in-memory record of what the connected holder holds — upstream's local user storage). It is not published at all: the consumer surface is the ACTS (creating a document, `inbox.share`, processing one's inbox — and, for a document in a public store, simply reading it), never a lookup; see § 15.

---

## 11. NURI and SPARQL string utilities

### Today — nothing. The entry publishes **no** string utility and **no** type guard.

```ts
// NOT published — internal, and each for a stated reason:
//   surface/sparql.ts  escapeLiteral, escapeIri, assertNuri
//   model/nuri.ts      isNuri, hasReadCap, targetOf, parseNuri, toNuri, mintCap
```

Two decisions meet here, and both point the same way.

**No guard, because the doors validate.** Every public entry takes `NuriLike` (`Nuri | string`) and runs `toNuri` itself — permissive in, precise out. A consumer holding a string from storage, a URL or a form passes it straight in; publishing a guard would invite the cast the types exist to prevent, and would put validation in the caller's hands where the door already does it.

**No `mintCap`, ever.** Nothing on the surface may turn a bare reference into a cap — that is the model's central invariant (§ 0 of `readcap-and-nuri-model.md`), so the function that could is unreachable from outside.

The escaping helpers were published until the surface was narrowed. Their removal costs a consumer nothing it will miss: they are generic injection-safety utilities, and neither `@ng-org/web` nor the ORM exposes an equivalent (re-verified against `index.d.ts` and `sdk/js/orm/src` — the engine escapes ad hoc where it builds SPARQL, e.g. `update_header`, `engine/verifier/src/request_processor.rs:196-208`). An application that interpolates SPARQL writes its own two-line escaper, against this lib or the real SDK alike.

### Target

**NO COUNTERPART at any level, and none expected** — which is precisely why none of it is published: a symbol with no successor, on a surface that promises one, is the thing this document exists to catch.

---

## 12. Scope resolution, per-entity documents, and the store registry

### Today — `@ng-eventually/sdk` (namespace `storeRegistry`) — plus `Scope` from `types.ts`

> **Narrowed twice.** 2026-08-03 the entry stopped re-exporting the whole `store-registry` module and kept an app-facing slice (`src/surface/placement.ts`). 2026-08-05 that slice lost its two inbox-ADDRESS functions as well: an application deposits with `inbox.postToDocument(doc, …)` and shares with `inbox.share(doc, toUser)` — always naming a document or a person, never an address, because upstream an address is resolved from a profile and never handled by a caller. **Five functions remain published**, listed first below; everything after them is kept for the record and is covered by `docs/internal-contract.md`.

```ts
// types.ts:38 — NB: NOT the ORM's Scope (a graphs/subjects filter); this is the store scope
export type Scope = "public" | "protected" | "private";

// store-registry.ts:90,234
// VirtualUserRecord is INTERNAL (shape kept here for the ruling below).
interface VirtualUserRecord {
  id: string;
  docPublic: Nuri;
  docProtected: Nuri;
  docPrivate: Nuri;
}
export interface RegistrySession {
  sessionId: string;
  privateStoreId: string;
  protectedStoreId?: string;
  publicStoreId?: string;
}

// PUBLISHED — the whole `storeRegistry` namespace, and nothing else.
export async function createEntityDoc(id: string, scope: Scope): Promise<Nuri>;
export async function listMyEntityDocs(id: string, scope: Scope): Promise<Nuri[]>;
export async function resolveScopeGraph(scope: Scope): Promise<Nuri>;
export async function resolveWriteGraph(id: string, scope: Scope): Promise<Nuri>;
export async function openDocumentInbox(doc: Nuri): Promise<Nuri>;

// NOT published — internal, kept here because the target rulings below still cover them.
//   userStoreDoc, userInbox, documentInboxAddress, isOwnInbox, myInboxes,
//   addLink, readLinks, resolveAccount, ensureAccount, reservedAccount,
//   resetRegistryCache, and the VirtualUserRecord type.
// `RegistrySession` IS published: a consumer types its injected `getSession` with it.
```

### Target — split by what each piece maps to

- **`createEntityDoc(id, scope)` → level 2, VERIFIED direction.** Target: `doc_create(session_id, crdt, class_name, destination, store_repo)` aimed at the identity's real per-scope store (see § 7 for the store-targeting nuance — the nodejs SDK already takes `store_type`/`store_repo` strings). The two writes the lib performs by hand are **native side effects** of `doc_create` upstream: the `ldp:contains` listing on the store's Main branch and the `AddRepo { read_cap }` on its Store branch (`engine/verifier/src/request_processor.rs:697-710`). The `id` parameter disappears (the session IS the identity); expect `createEntityDoc(id, scope)` to become `doc_create(sid, …, storeOf(scope))` with no listing/cap bookkeeping.
- **`listMyEntityDocs(id, scope)` → level 1/2, VERIFIED mechanism.** Upstream the listing is the store's `ldp:contains` graph (written at `request_processor.rs:706-708`), readable with an anchored `sparql_query` on the store; the caps come back by replaying the Store branch (`AddRepo::verify` → `load_repo_from_read_cap`). The function's shape (give me my per-scope doc NURIs) survives; its implementation becomes one native read.
- **`userStoreDoc(id, scope)` / `resolveScopeGraph(scope)` / `resolveWriteGraph(id, scope)` → level 2, VERIFIED.** The target answers these from the session: `did:ng:` + `session.private_store_id | protected_store_id | public_store_id` (`Session`, `index.d.ts:264-272`). The store IS the container; the per-scope index document disappears.
- **`userInbox(id)` → level 1, VERIFIED counterpart with a different granularity.** Upstream a user's inboxes are their public and protected STORE repos' inboxes — the only two `AddInboxCap` commits in the engine (`engine/verifier/src/site.rs:128,149`). An identity-level "my inbox" therefore maps to a store inbox; the resolution moves into the lib/SDK and the consumer's act (deposit to an address, process my own) is unchanged.
- **`openDocumentInbox(doc)` / `documentInboxAddress(doc)` → level 1, VERIFIED support, no exerciser.** Every `Repo` carries `inbox: Option<PrivKey>` (`engine/repo/src/repo.rs:126`); `AddInboxCapV0` is keyed by `repo_id` with no is-store restriction (`engine/repo/src/types.rs:1973`; applied at `engine/verifier/src/verifier.rs:1920-1928`); but no code path creates one for a plain document (`doc_create` leaves `inbox: None`, `repo.rs:574`) and no level-2/3 API exposes any of it. So: the *capability* is engine-verified; the *functions* are invented surface; and the **address publication is a real, deliberate divergence** (upstream transmits addresses, never publishes them — § 9), with the ownership guard compensating our design, not mirroring an upstream rule.
- **`addLink(cap)` / `readLinks()` → level 1, VERIFIED model, no JS surface.** The emulated `AddLink { read_cap }` register (`engine/repo/src/types.rs:1939-1948` — *"so that a user can share with all its device a new Link they received"*, external repos only). Upstream this filing happens inside the verifier when it processes the inbox; the future SDK most likely never exposes these as calls, so consumers should not code against them (§ 15).
- **`resolveAccount` / `ensureAccount` / `VirtualUserRecord` / `RegistrySession` / `reservedAccount` / `resetRegistryCache` → NO COUNTERPART.** The shared-wallet shim (accounts directory, pointer → doc-shim indirection) has no image in the target — the target has no central directory of identities (`docs/migration-guide.md` § 3). The whole group disappears with the shim.
- **`isOwnInbox` / `myInboxes` → NO COUNTERPART as API.** Upstream the question "which inboxes may I read" is answered inside the verifier by the User branch's `AddInboxCap` records; nothing suggests a JS API for it. These exist for the emulated read guard and the connection drain.

---

## 13. Identity and connection

### Today

```ts
// PUBLISHED — the POLYFILL-ERA block of `src/index.ts`, both with no counterpart.
export function setCurrentUser(id: PrincipalId | null): void;            // shared-wallet/bootstrap.ts
export async function connectedUser(): Promise<void>;                    // emulated-verifier/connect.ts

// NOT published (removed 2026-08-05) — identity persistence is the application's job
// upstream too, and asking the library who you signed in is a shared-wallet convenience:
//   shared-wallet/virtual-users.ts   IdentityStore, browserIdentityStore,
//                                    VirtualUserStorage, ACCOUNT_STORAGE_KEY
//   shared-wallet/bootstrap.ts       getCurrentUser
// The access gate persists what IT needs (§ 2bis); nothing else has to be exposed.
```

### Target

**PASSTHROUGH-to-be at level 2, VERIFIED signatures.** In the target the identity is established by opening one's own wallet and starting a per-user session — there is no "set the current user" call because the session IS the user:

```ts
// index.d.ts:276, 280, 313, 315
declare function session_start(wallet_name: string, user_id: any): Promise<any>;
declare function session_stop(user_id: string): Promise<void>;
declare function user_connect(client_info: any, user_id: string, location?: string | null): Promise<any>;
declare function user_disconnect(user_id: string): Promise<void>;
```

- `IdentityStore` / `browserIdentityStore` (the persisted identity id) — **NO COUNTERPART**; they exist only because every virtual user shares one wallet, and they are no longer published at all. Removed at migration (`docs/migration-guide.md` § 5).
- `setCurrentUser` — **NO COUNTERPART**; the relay of an identity the broker cannot see. Disappears with the shared wallet. `getCurrentUser` was its read side and is gone from the surface: an application knows who it signed in.
- `connectedUser()` — the awaitable form of what the target does **automatically**: the recipient's verifier processes its inbox as messages arrive/at connection (`Verifier::inbox`, `engine/verifier/src/verifier.rs:1674`). VERIFIED at level 1 that no consumer call is needed upstream; the polyfill fires it from `setCurrentUser` for the same reason. A consumer should treat it as "await a deterministic start" (tests), not as an operation the future SDK will name.

---

## 14. Type re-exports

`@ng-eventually/sdk` re-exports, type-only (erased at build, `index.ts:48-50`):

```ts
export type { ShapeType, BaseType, Schema } from "@ng-org/shex-orm";
export type { DeepSignalSet } from "@ng-org/alien-deepsignals";
export type { NG } from "@ng-org/web";
```

**PASSTHROUGH (levels 2/3, VERIFIED)** — `ShapeType`/`BaseType` at `@ng-org/shex-orm` `dist/types.d.ts:5,12` (installed 0.1.2-alpha.8); `NG` at `index.d.ts:136`. At migration these imports point at the same packages directly; nothing changes for the consumer.

---

## 15. Machinery on the surface — what a consumer should NOT code against

Exported, but not SDK surface. Coding against these builds knowledge that migration deletes:

- **`docs.depositInto`** — the named boundary-crossing write `inbox.post` uses. It is exported only because `inbox.ts` lives in another module; a consumer must always go through `inbox.post` / `inbox.share`. Upstream a deposit is a sealed message, not a SPARQL update — this function's very signature is emulation.
- **`getConfig` / `getStoreRegistryDeps`** — tagged `@internal` in source, exported for the lib's own wrappers.
- **`resetConfig` / `resetStoreRegistry` / `resetCaps` / `storeRegistry.resetRegistryCache`** — test/reset machinery. In particular `resetCaps` wipes EVERY holder's caps, which no product flow should ever do.
- **`getCaps()` and the `CapRegistry` class** — the registry is the emulation's engine room. The consumer surface is the acts that file caps: creating a document, `inbox.share` (grant), processing one's inbox, and reading a document a public store serves. `CapRegistry.grantWrite` / `governsWrite` / `canWrite` / `hasWritePolicy` are explicitly decorative until P1b — the guard they feed is bypassed by every internal writer.
- ~~**`storeRegistry.reservedAccount`, `resolveAccount`, `ensureAccount`, `VirtualUserRecord`, `RegistrySession`**~~ — **RESOLVED 2026-08-03**: no longer exported. Shim internals, now in `docs/internal-contract.md`. The consumer's legitimate touchpoint is `configureStoreRegistry` (bootstrap) plus the scope/entity resolvers.
- ~~**`storeRegistry.addLink` / `readLinks`**~~ — **RESOLVED 2026-08-03**: no longer exported. Consumers receive caps by processing their inbox (automated at connection); calling these directly baked in a register the verifier owns upstream.
- ~~**`virtualUsers.*` on the SDK entry**~~ — **RESOLVED 2026-08-03**: moved to `/polyfill`, where its disappearance at migration is visible at the import line.
- **`inbox.watch`'s `_opts?: { intervalMs?: number }`** — accepted and ignored (no polling exists). Dead compatibility surface; do not pass it.
- **The `label` parameters** on `docs.sparqlUpdate` / `docs.sparqlQuery` / `docs.depositInto` — lib-internal access-log tags, never forwarded to `ng`. The real signatures have no such parameter.

### Places the current surface teaches something to unlearn

- ~~**The SDK entry is not as pure as its header claims.**~~ **FIXED 2026-08-03.** The header claimed the entry "exposes ONLY what `@ng-org/web` / `@ng-org/orm` expose" while also shipping `virtualUsers` and the whole `store-registry` module. Both are gone from it, and the header now states what the entry actually promises: *every symbol here has a target-SDK counterpart, verified or assumed, listed in this document*. It still exports `docs`, `readUnion`, `watchShape`, `subscribeDoc(s)`, the SPARQL helpers and the NURI guards — justified inventions, documented per subject above — so the promise is no longer "@ng-org surface only", which was never true, but "nothing here is machinery".
- ~~**`share` is importable from both entries.**~~ **FIXED 2026-08-07** with the entry merge: there is one entry and one `share`, under `inbox`.
- **One entry means the import line no longer says what disappears.** Until 2026-08-07 a second import path (`/polyfill`) WAS the deletion list. It is now the `POLYFILL-ERA` block in `src/index.ts`, this appendix's note above, and the per-subject rulings in this document. That is a documentation-carried signal where it used to be a mechanical one — the appendix is pinned by a test, the grouping is not.
- **`inbox.read`/`materialize` as a mailbox** — enumerating raw deposits is emulation detail (§ 9); the durable contract is deposit-and-it-gets-applied. An app building UI on the deposit list should expect that surface to change shape entirely.
- **`watchShape`'s "planned `useShape` upgrade"** — stated in the module header with no provenance in this repo or the clone (§ 5). The load-state *distinction* is safe; the claim that NextGraph plans this exact hook shape is an assumption and must not be cited as an announced API.
- **`UnionSubject` property bags** — polyfill read-model shape, not a target type; map them into app types at the boundary (which `watchShape`'s design already assumes).
- **The sync-returning `subscribeDoc` unsubscribe** vs the target's promise-resolved one (§ 8) — a deliberate, documented ergonomic delta; an adapter is one line at migration, but it is a delta.

---

## Appendix — full export inventory (for diffing)

*Generated from the `export` statements, and pinned by `packages/sdk/test/vocabulary.test.ts` — if this list and the code disagree, that test fails. It went stale once, still listing `storeRegistry`'s shim internals after the entry had been narrowed, which is what a hand-maintained inventory does.*

### `@ng-eventually/sdk` — `src/index.ts` (the only entry since 2026-08-07)

```text
direct: BaseType, DeepSignalSet, DocChange, DocChangeType, EventuallyConfig, InboxScope, NG, NgLike, Nuri, NuriLike, PrincipalId, ReadCap, RegistrySession, Schema, Scope, ShapeObservable, ShapeQuery, ShapeType, SharedWalletConfig, StoreRegistryDeps, UnionSubject, Unsubscribe, UseShapeLike, configure, configureStoreRegistry, connectedUser, docChangeType, ensureIdentity, init, initNg, ng, readUnion, setCurrentUser, subscribeDoc, subscribeDocs, useShape, watchShape
docs: depositInto, docCreate, sparqlQuery, sparqlUpdate
inbox: Deposit, PostOptions, materialize, post, postToDocument, processInbox, read, readForDocument, readSynced, share, watch
storeRegistry: createEntityDoc, listMyEntityDocs, openDocumentInbox, resolveScopeGraph, resolveWriteGraph
```

**Of these, four are POLYFILL-ERA and have no target counterpart** — `configure`,
`configureStoreRegistry`, `setCurrentUser`, `connectedUser` (plus the types
`EventuallyConfig`, `StoreRegistryDeps`, `RegistrySession`). They are the deletion list,
and `src/index.ts` groups them under a heading that says so. `ensureIdentity` is a fifth
in substance — the shared-wallet gate — but the *call site* survives (§ 2bis).

Six symbols the previous `/polyfill` entry published are gone from the surface entirely:
`getConfig` and `getStoreRegistryDeps` (internal wiring, reached through
`shared-wallet/bootstrap`), `resetConfig` / `resetStoreRegistry` / `resetCaps` (test
resets, reached by their internal path), and the direct `share` re-export — `inbox.share`
was always the same function, and publishing it twice blurred the boundary it was meant
to mark.