@@ -0,0 +1,43 @@
+---
+'@object-ui/app-shell': minor
+---
+
+The wrong-layer root advisory asks the platform for its verdict instead of keeping
+a second copy of it (objectui#9318).
+
+`rowCanonAdvisory` answered "is this root bound on this surface?" from objectui's
+own knowledge — `@object-ui/core`'s detector hard-codes the single root `data`, and
+the docblock justified that from `ROW_PREDICATE_ROOTS` / `FIELD_RULE_ROOTS` /
+`FORMULA_ROOTS`. `@objectstack/lint` publishes the same judgement as
+`fieldRuleRootIssue` / `FIELD_RULE_BOUND_ROOTS`, pinned upstream. Two hand-maintained
+copies of one judgement, agreeing today, with nothing keeping them agreeing: the next
+root the platform binds or unbinds moves one and not the other, silently.
+
+A `CelSchemaHint.slot` (and the matching `CelPredicateField` prop) names the authored
+key, and on the three slots whose bound set IS the field-rule set — `visibleWhen`,
+`readonlyWhen`, `requiredWhen` — the verdict and the message now come from the helper.
+That set is objectui's own answer, not the helper's: `fieldRuleRootIssue` has no slot
+vocabulary at all — hand it any slot name and it still judges, gating on the ROOT and
+interpolating whatever name it was given. Which surfaces it may answer for is therefore
+this repo's call. Both are internal to `@object-ui/app-shell`; no package export moves.
+
+**Behaviour change, deliberate and warning-only.** Those three editors now advise on
+every root the field level leaves unbound — except `app` — where before only `data`
+was reported, and each carries the engine's own per-root diagnostic rather than
+objectui's single sentence. `app` is the one exception, and for a structural reason
+rather than as a special case: the advisory runs only on an error-free predicate, and
+`app` is the single judged root the platform does not declare, so the pre-existing
+bare-reference error fires first and the advisory never runs. Severity stays
+objectui's own `warning` — every save gate on this tier counts `severity === 'error'`,
+so no accept set moves and no predicate already stored in customer metadata is refused.
+
+**Coverage is not shrunk to fit the helper.** Two guarded surfaces bind a set that is
+not the field-rule set, and neither is comparable to it — they overlap on `record`
+alone. A `formula` field's `expression` binds `FORMULA_ROOTS` (`record`), a proper
+subset. A conditional-formatting `condition` binds `ROW_PREDICATE_ROOTS` (`record`,
+`current_user`, `user`, `features`, `os`, `ctx`) — five roots the field tier does not
+bind, but not a superset of it either, since it lacks `previous` and `parent`. Routed
+through the helper, the condition would be told to rewrite five roots that work there,
+and the formula would be told `previous` and `parent` are bound when it binds neither.
+Those keep the local instrument unchanged, and both are pinned as live controls against
+a later tidy-up that routes them through the helper anyway.
@@ -87,6 +87,14 @@ export interface CelPredicateFieldProps {
   scope?: 'record' | 'flattened';
   /** Override the scope roots offered by autocomplete (see CelSchemaHint.roots). */
   roots?: string[];
+  /**
+   * The authored key this editor writes (`visibleWhen`, `readonlyWhen`,
+   * `requiredWhen`) — see `CelSchemaHint.slot`. Naming it lets the wrong-layer
+   * advisory take the platform's published per-slot verdict (objectui#9318);
+   * leaving it unset keeps the local one, which is the right answer for the
+   * surfaces whose bound roots are not the field-rule set.
+   */
+  slot?: string;
   /**
    * Engine field role (see CelSchemaHint.role). `'predicate'` (default) for
    * boolean conditions; `'value'` for formula expressions — which also turns
@@ -118,6 +126,7 @@ export function CelPredicateField({
   clause,
   scope,
   roots,
+  slot,
   role,
   onLintChange,
   onInferredTypeChange,
@@ -168,7 +177,7 @@ export function CelPredicateField({
   React.useEffect(() => {
     let cancelled = false;
     const handle = setTimeout(() => {
-      const hint = { objectName, fields: fieldNames, clause, scope, role };
+      const hint = { objectName, fields: fieldNames, clause, scope, slot, role };
       lintCelPredicate(value, hint).then((res) => {
         if (cancelled) return;
         setIssues(res);
@@ -188,7 +197,7 @@ export function CelPredicateField({
       clearTimeout(handle);
     };
     // eslint-disable-next-line react-hooks/exhaustive-deps
-  }, [value, objectName, fieldsKey, clause, scope, role]);
+  }, [value, objectName, fieldsKey, clause, scope, slot, role]);
 
   /* Report "clean" upward when the field empties (no debounce needed). */
   React.useEffect(() => {
 
@@ -0,0 +1,212 @@
+// Copyright (c) 2025 ObjectStack. Licensed under the Apache-2.0 license.
+
+/**
+ * objectui#9318 — the wrong-layer verdict comes from `@objectstack/lint`, not
+ * from a second hand-maintained copy of it.
+ *
+ * ## What moved
+ *
+ * `rowCanonAdvisory` used to answer "is this root bound on this surface?" from
+ * objectui's own knowledge: `@object-ui/core`'s `detectNonCanonicalRowSpelling`
+ * hard-codes ONE root (`data`) and objectui's docblock justified that from
+ * `ROW_PREDICATE_ROOTS` / `FIELD_RULE_ROOTS` / `FORMULA_ROOTS`. The platform
+ * publishes the same judgement as `fieldRuleRootIssue` / `FIELD_RULE_BOUND_ROOTS`.
+ * Two copies of one judgement agree today and nothing keeps them agreeing.
+ *
+ * ## What did NOT move, and is pinned here as such
+ *
+ * The helper judges against `FIELD_RULE_BOUND_ROOTS` = `record` / `previous` /
+ * `parent` — whatever slot name it is handed. It has no vocabulary gate of its
+ * own (measured: an unrecognised slot still returns a finding, not `null`), so
+ * WHICH surfaces it may answer for is objectui's call, not the platform's. Two
+ * of the surfaces `rowCanonAdvisory` guards bind a set that is not that one, and
+ * neither is comparable to it — they overlap on `record` alone:
+ *
+ *  - the conditional-formatting `condition` binds `ROW_PREDICATE_ROOTS`
+ *    (`record`, `current_user`, `user`, `features`, `os`, `ctx`) — five roots
+ *    the field tier does not bind, but NOT a superset: no `previous`, no
+ *    `parent`;
+ *  - a `formula` field's `expression` binds `FORMULA_ROOTS` (`record`) — a
+ *    proper subset.
+ *
+ * So the helper's verdict is adopted exactly on the three slots whose bound set
+ * IS the field-rule set, and the local fallback is KEPT for the rest. The two
+ * "uncovered surface" pins below are live controls for the failure this card
+ * exists to stop, in miniature: routing every surface through the helper to
+ * make the code tidier would redden them.
+ *
+ * Severity stays objectui's own mapping (`warning`, never `error`) on both
+ * paths — every save gate on this tier counts `severity === 'error'`.
+ */
+
+import { describe, it, expect } from 'vitest';
+import { fieldRuleRootIssue, FIELD_RULE_BOUND_ROOTS } from '@objectstack/lint';
+import { SCOPE_ROOTS } from '@objectstack/formula';
+import { lintCelPredicate } from './celAuthoring';
+
+const HINT = { objectName: 'account', fields: ['organization_id', 'owner_id', 'status', 'amount'] };
+/** A field conditional rule — a slot the published helper's vocabulary covers. */
+const RULE_SLOT_HINT = { ...HINT, scope: 'record' as const, slot: 'visibleWhen' as const };
+/** The same tier with no slot named — the local fallback, unchanged. */
+const UNSLOTTED_HINT = { ...HINT, scope: 'record' as const };
+
+/** objectui's own advisory sentence; the engine's never contains it. */
+const OBJECTUI_MESSAGE_MARKER = /Re-root/;
+
+describe('celAuthoring · the field-rule verdict is the published one (objectui#9318)', () => {
+  it('TRUE POSITIVE — a covered slot takes BOTH the verdict and the message from `fieldRuleRootIssue`', async () => {
+    const source = "data.status == 'x'";
+    const issues = await lintCelPredicate(source, RULE_SLOT_HINT);
+    const engine = fieldRuleRootIssue('visibleWhen', source);
+    // The helper has something to say about this source — if it ever stops,
+    // this pin is measuring nothing and must be re-derived, not relaxed.
+    expect(engine).not.toBeNull();
+    const advisory = issues.filter((i) => i.severity === 'warning' && i.message === engine!.message);
+    // Verbatim equality against the helper's OWN output, evaluated here rather
+    // than transcribed: this asserts "objectui ships the engine's message" and
+    // can never drift with upstream wording the way a quoted string would.
+    expect(advisory).toHaveLength(1);
+  });
+
+  it('ships ONE message, never both — objectui\'s sentence is gone from the covered path', async () => {
+    const issues = await lintCelPredicate("data.status == 'x'", RULE_SLOT_HINT);
+    expect(issues.filter((i) => OBJECTUI_MESSAGE_MARKER.test(i.message))).toEqual([]);
+    expect(issues.filter((i) => i.severity === 'warning')).toHaveLength(1);
+  });
+
+  it('LIVE CONTROL — the ACCEPT SET is not narrowed: the covered path raises no error', async () => {
+    // Every save gate on this tier counts `severity === 'error'` and nothing
+    // else, so "zero errors" IS "still accepted". Reddens on exactly one
+    // change — promoting the advisory to `error`.
+    const issues = await lintCelPredicate("data.status == 'x'", RULE_SLOT_HINT);
+    expect(issues.filter((i) => i.severity === 'error')).toEqual([]);
+  });
+
+  it('a root the platform DOES bind comes back clean THROUGH the new path', async () => {
+    // The ablation target: `previous` and `parent` are clean here because
+    // `FIELD_RULE_BOUND_ROOTS` says the field level binds them, not because
+    // objectui's detector only ever looked at `data`.
+    expect(await lintCelPredicate("previous.status == 'x'", RULE_SLOT_HINT)).toEqual([]);
+    expect(await lintCelPredicate('parent.status == "paid"', RULE_SLOT_HINT)).toEqual([]);
+    expect(await lintCelPredicate("record.status == 'x'", RULE_SLOT_HINT)).toEqual([]);
+  });
+
+  it('takes the WIDER verdict on a covered slot: a root no field rule binds is advised too', async () => {
+    // A declared behaviour change, and the substance of adopting the published
+    // verdict: `current_user` is in the engine's baseline `SCOPE_ROOTS`, so
+    // `validateExpression` says nothing about it, while the FIELD level does
+    // not bind it. objectui's one-root detector could never reach this.
+    // "WIDER" in the name is this verdict against the ONE-ROOT detector it
+    // replaces — ⛔ not a set relation between the two surfaces' bound roots,
+    // which are incomparable (see the header).
+    const issues = await lintCelPredicate('current_user.isAdmin', RULE_SLOT_HINT);
+    const advisory = issues.filter((i) => i.severity === 'warning' && /current_user/.test(i.message));
+    expect(advisory).toHaveLength(1);
+    expect(issues.filter((i) => i.severity === 'error')).toEqual([]);
+  });
+
+  it('stands down on a parse error and on a non-CEL dialect, like the path it replaces', async () => {
+    const broken = await lintCelPredicate('data.status ==', RULE_SLOT_HINT);
+    expect(broken.some((i) => i.severity === 'error')).toBe(true);
+    expect(broken.filter((i) => i.severity === 'warning' && /\bdata\b/.test(i.message))).toEqual([]);
+    const legacy = await lintCelPredicate('${data.status}', RULE_SLOT_HINT);
+    expect(legacy.filter((i) => i.severity === 'warning' && /\bdata\b/.test(i.message))).toEqual([]);
+  });
+});
+
+describe('celAuthoring · the UNCOVERED surfaces keep the local fallback (objectui#9318 part 3)', () => {
+  it('LIVE CONTROL — a formula `expression` still gets objectui\'s message, not the engine\'s', async () => {
+    // `FORMULA_ROOTS` is `['record']` — a proper SUBSET of
+    // `FIELD_RULE_BOUND_ROOTS`. Routing this through the helper would not shrink
+    // coverage: measured, `previous.*` / `parent.*` report nothing on this
+    // surface today either. It would report them CLEAN on the helper's own
+    // authority — asserting they are bound where this surface binds only
+    // `record`. A false green, which is worse than the silence it replaces.
+    const issues = await lintCelPredicate('data.amount * 0.2', { ...UNSLOTTED_HINT, role: 'value' as const });
+    const advisory = issues.filter((i) => i.severity === 'warning' && OBJECTUI_MESSAGE_MARKER.test(i.message));
+    expect(advisory).toHaveLength(1);
+    expect(issues.filter((i) => i.severity === 'error')).toEqual([]);
+  });
+
+  it('LIVE CONTROL — a conditional-formatting condition is NOT advised for the roots it binds', async () => {
+    // `ROW_PREDICATE_ROOTS` carries `current_user`, `user`, `features`, `os`,
+    // `ctx` on top of `record` — five roots the field tier does not bind. It is
+    // NOT a superset of `FIELD_RULE_BOUND_ROOTS` though: it lacks `previous` and
+    // `parent`, so the two sets overlap on `record` alone. This is the pin that
+    // reddens if someone routes every `scope: 'record'` surface through the
+    // helper: the author would be told to rewrite five roots that work here.
+    expect(await lintCelPredicate('current_user.isAdmin', UNSLOTTED_HINT)).toEqual([]);
+    expect(await lintCelPredicate("os.name == 'x'", UNSLOTTED_HINT)).toEqual([]);
+  });
+
+  it('an unknown slot name falls back rather than guessing', async () => {
+    const issues = await lintCelPredicate('current_user.isAdmin', { ...UNSLOTTED_HINT, slot: 'someFutureWhen' });
+    expect(issues).toEqual([]);
+  });
+});
+
+describe('celAuthoring · platform drift tripwire (objectui#9318)', () => {
+  it('the published bound set is still the one objectui measured its coverage answer against', async () => {
+    // NOT a second copy of the verdict — the verdict is read from the helper at
+    // runtime and this assertion is never consulted by product code. It exists
+    // so that the next root the platform binds or unbinds arrives as a RED test
+    // in objectui, with the instruction to re-derive which of this repo's
+    // surfaces the helper's vocabulary still covers (PR objectui#9318 part 3).
+    expect([...FIELD_RULE_BOUND_ROOTS]).toEqual(['record', 'previous', 'parent']);
+  });
+
+  it('SWEEPS the whole unbound population: every root is advised EXCEPT `app`', async () => {
+    // The instrument behind the docblock's universal. The published prose says
+    // "every root the field level leaves unbound is advised, except `app`" and
+    // ⛔ names no others — because any written-down list goes stale the next
+    // time the platform moves a root. This sweep re-derives the population on
+    // every run instead, so the claim cannot rot silently: it reddens when a
+    // root stops being advised, when a SECOND root starts being blocked, or
+    // when any root goes silent.
+    //
+    // ⚠️ The universe is RECONSTRUCTED, and that is a declared limit, not an
+    // oversight: `@objectstack/lint` keeps both `FIELD_RULE_JUDGED_ROOTS` and
+    // `FIELD_RULE_AMBIENT_ROOTS` module-private (neither is in its export list
+    // at 17.4.0), so the judged set is rebuilt here as `SCOPE_ROOTS` plus the
+    // one ambient root. A NEW ambient root added upstream would be invisible to
+    // this sweep until that literal is updated — nothing in this repo can see
+    // it. The `app` leg below pins the reconstruction itself.
+    const judged: readonly string[] = [...SCOPE_ROOTS, 'app'];
+    const bound: readonly string[] = FIELD_RULE_BOUND_ROOTS;
+    const candidates = judged.filter((r) => !bound.includes(r));
+    expect(candidates.length).toBeGreaterThan(1); // the sweep is measuring something
+
+    const advised: string[] = [];
+    const blocked: string[] = [];
+    const silent: string[] = [];
+    for (const root of candidates) {
+      const source = `${root}.x == 1`;
+      const issues = await lintCelPredicate(source, RULE_SLOT_HINT);
+      const engine = fieldRuleRootIssue('visibleWhen', source);
+      // Verbatim equality with the helper's own output, as elsewhere in this
+      // file — never a transcribed string.
+      if (engine && issues.some((i) => i.severity === 'warning' && i.message === engine.message)) advised.push(root);
+      else if (issues.some((i) => i.severity === 'error')) blocked.push(root);
+      else silent.push(root);
+    }
+
+    // The universal, and the single documented exception.
+    expect(silent).toEqual([]);
+    expect(blocked).toEqual(['app']);
+    expect(advised).toEqual(candidates.filter((r) => r !== 'app'));
+  });
+
+  it('WHY `app` is the exception: the helper judges it, the platform does not DECLARE it', async () => {
+    // The exception is a mechanism, not a special case: the advisory is gated
+    // behind `issues.every((i) => i.severity !== 'error')`, and a root the
+    // engine does not declare raises a bare-reference ERROR first. `app` is the
+    // only judged root in that position — it is AMBIENT (renderer-mounted),
+    // which is exactly why the engine's own message for it refuses the
+    // `record.app` rewrite by name.
+    expect(SCOPE_ROOTS).not.toContain('app');
+    expect(fieldRuleRootIssue('visibleWhen', 'app.theme == "dark"')).not.toBeNull();
+    const issues = await lintCelPredicate('app.theme == "dark"', RULE_SLOT_HINT);
+    expect(issues.some((i) => i.severity === 'error')).toBe(true);
+    expect(issues.filter((i) => i.severity === 'warning')).toEqual([]);
+  });
+});