diff --git a/.changeset/adr-0099-p2prime-two-axis-cells.md b/.changeset/adr-0099-p2prime-two-axis-cells.md
new file mode 100644
index 0000000000..2e176bd822
--- /dev/null
+++ b/.changeset/adr-0099-p2prime-two-axis-cells.md
@@ -0,0 +1,5 @@
+---
+'@objectstack/plugin-security': patch
+---
+
+ADR-0099 P2′ (#3211 M3′): pin the two-axis Amendment in the authz matrix. The original P2 (collapse the Layer 1 tier onto posture) was rejected — Layer 1's tier input is the per-object super-bit, a per-principal × per-object delegation primitive posture cannot represent. New cells pin: seeded-face agreement (seeded super-bit holders are already ≥ TENANT_ADMIN), the load-bearing delegation cell (a MEMBER with a delegated per-object `viewAllRecords`/`modifyAllRecords` short-circuits Layer 1 yet stays walled by Layer 0 — the auditor pattern), invariant I7 (the scope axis never crosses a boundary posture has not opened), and the contrast that the bit is a real grantable capability, not conditionally inert. Test-only; zero behavior change.
diff --git a/docs/adr/0099-posture-adjudicated-tiering-and-external-rung.md b/docs/adr/0099-posture-adjudicated-tiering-and-external-rung.md
index d8957bc0bb..c988261c8a 100644
--- a/docs/adr/0099-posture-adjudicated-tiering-and-external-rung.md
+++ b/docs/adr/0099-posture-adjudicated-tiering-and-external-rung.md
@@ -1,6 +1,6 @@
 # ADR-0099: Posture-Adjudicated Tiering — one axis for tier decisions, the EXTERNAL rung's enforcement path, no explicit deny
 
-**Status**: Accepted (2026-07-18; proposed 2026-07-17) — P0 equivalence gate landed with the acceptance (see the Acceptance addendum); P1/P2 flips gated on the #3211 G1 delta adjudication
+**Status**: Accepted (2026-07-18; proposed 2026-07-17) — P0 equivalence gate landed with the acceptance (see the Acceptance addendum); P1 shipped (#3226). Amended 2026-07-18: **two-axis correction** — D2's Layer 1 tier input corrected to the per-object scope bits, original P2 superseded by P2′ (see the Amendment)
 **Deciders**: ObjectStack Protocol Architects
 **Builds on**: [ADR-0095](./0095-authz-kernel-tenant-layer-and-posture-ladder.md) (the posture ladder + Layer 0 — Accepted, implemented; this ADR is its adjudication follow-through), [ADR-0066](./0066-unified-authorization-model.md) (superuser bypass ①; precedence), [ADR-0090](./0090-permission-model-v2-concept-convergence.md) (D10 principal taxonomy / `audience`, D11 external OWD), [ADR-0093](./0093-tenancy-mode-and-membership-lifecycle.md) (membership lifecycle — where an external principal type would come from), [ADR-0094](./0094-sys-permission-set-pure-projection.md) (one-authority precedent)
 **Composes with**: [ADR-0096](./0096-execution-surface-identity-admission.md) — 0096 governs **admission** (may this call reach the engine, as whom); this ADR governs **tiering** (given an admitted principal, which tier of rows each layer grants). Orthogonal axes, deliberately separate ADRs.
@@ -121,9 +121,13 @@ Every enforcement-time **tier** decision reads `ctx.posture`:
   ADR-0096 D3 is progressively eliminating). When both signals are present
   the carried rung wins; a disagreement is logged as a defect signal, and the
   **narrower** verdict is enforced (fail-safe).
-- **Layer 1 short-circuit**: the *tier* question ("does business RLS apply at
-  all inside the org") reads posture (`>= TENANT_ADMIN` short-circuits, per
-  today's semantics); the *side* question keeps its per-side capability bit —
+- **Layer 1 short-circuit** *(superseded by the two-axis Amendment below)*: the
+  original text read the tier from posture (`>= TENANT_ADMIN`) and claimed
+  today's semantics. The pre-P2 verification (framework#3211) showed that is
+  NOT today's semantics: the tier input is the **per-object** super-bit, which
+  a custom set can delegate to a non-admin principal — a per-principal ×
+  per-object fact the per-principal posture cannot represent. Layer 1's tier
+  input therefore **stays the per-side, per-object capability bit**;
   `viewAllRecords` gates the read bypass, `modifyAllRecords` the write bypass,
   exactly as today. Posture never grants a side the bits don't.
 - **Explain** reports the carried rung it read — the same field, not a
@@ -148,6 +152,12 @@ it would have caught).
 | **Write path** | tier does not bypass write guards: readonly strip (#2957), identity write guard (ADR-0092), Layer 0 write wall (#2946) all still apply | same | same | shares with edit access only |
 | **Explain** | reports the carried rung — identical input as enforcement, by construction | same | same | same |
 
+> **Amendment note (2026-07-18):** the **Layer 1** row above is corrected by
+> the two-axis Amendment — the tier at Layer 1 is *not* selected by posture;
+> it is selected by the per-object super-bits (a `MEMBER` holding a delegated
+> per-object `viewAllRecords` short-circuits business RLS on that object,
+> tenant-walled as ever). The Layer 0 and EXTERNAL rows stand as written.
+
 Invariants (each carries a matrix cell):
 
 - **I1** — `TENANT_ADMIN` never crosses Layer 0. No capability composition may
@@ -233,8 +243,11 @@ Strictly serial, each step behind the matrix:
   rung (probe demoted to fallback; stale comment at
   `security-plugin.ts:71-77` retired). Behavior-preserving under P0's gate.
   Unblocked today (#2956); small.
-- **P2** — Layer 1 short-circuit reads posture for tier (side bits unchanged).
-  Behavior-preserving under the gate.
+- **P2** *(superseded — rejected at adjudication, replaced by P2′; see the
+  Amendment)* — the original "Layer 1 short-circuit reads posture for tier"
+  turned out NOT to be behavior-preserving: it would inert the delegated
+  per-object super-bit for non-admin principals. P2′ is documentation cells
+  only (seeded-face agreement, the delegation cell, I7), zero behavior change.
 - **P3 (demand-gated)** — EXTERNAL derivation + injection when the external
   principal type ships (portal track). New behavior for a new principal type;
   no existing principal's visibility changes. If any breaking surface
@@ -333,3 +346,64 @@ D1's behavior contract with one finding:
   doing its job as specified ("any cell where they disagree … must be
   resolved before the flip") — the resolution is D1's rung authority, not a
   probe repair.
+
+## Amendment — the two-axis correction (2026-07-18)
+
+**Trigger.** P1 shipped behavior-preserving on the seeded face (#3226). The
+pre-P2 verification (framework#3211) then found that D2's Layer 1 tier claim
+was **not** behavior-preserving as written. Layer 1's tier input today is the
+per-object super-bit — a **per-principal × per-object delegation primitive**:
+a custom permission set may grant `viewAllRecords` on one object (all invoices
+to an auditor position) without granting any admin stature. This is the
+industry-standard shape (Salesforce object-level View All / Modify All,
+org-level per-entity access in comparable platforms). Posture is
+**per-principal** — one rung per principal — and structurally cannot carry
+per-object scope: a MEMBER with a delegated invoice view-all and a plain
+MEMBER sit on the same rung. Enforcing D2's MEMBER cell literally would have
+(a) made a declared, grantable bit conditionally inert — the
+declared-but-unenforced class ADR-0049 forbids and the silent-miss failure
+mode this platform removes everywhere else — and (b) deleted a mainstream
+delegation capability, forcing over-grants (promote the auditor to org admin)
+to recover it.
+
+**Decision (maintainer, 2026-07-18).** The model is corrected to **two
+orthogonal axes, each with a single authority** — the table's Layer 1 row is
+amended rather than enforced:
+
+- **Posture is the boundary axis** (per-principal). It exclusively governs the
+  ladder's *ends*: the Layer 0 cross-tenant exemption at `PLATFORM_ADMIN`
+  (P1, shipped) and the EXTERNAL rung's wholesale replacement of the member
+  pipeline (P3, demand-gated). No other enforcement site consults posture for
+  tiering.
+- **The per-object super-bits are the scope axis** (per-principal ×
+  per-object). `viewAllRecords` / `modifyAllRecords` remain the only Layer 1
+  tier input — per side, per object, delegable to any position; today's
+  semantics, unchanged.
+- **D1's "single adjudication input" refines to "single authority per
+  axis."** The disease this ADR treats — one fact re-derived at multiple
+  sites — stays dead: the boundary fact has one derivation (the resolver) and
+  one enforcement reader (the Layer 0 gate); the scope fact has one evaluator
+  (`PermissionEvaluator.hasSuperuser*Bypass`). Neither is derived anywhere
+  else.
+- **I7 (new — the I5 dual):** the scope axis never crosses a boundary the
+  posture axis has not opened. A super-bit holder below `PLATFORM_ADMIN`
+  stays tenant-walled (enforced by P1; pinned in the matrix), and an EXTERNAL
+  principal's explicit-share rule replaces Layer 1 regardless of any held
+  bits (pinned when P3 lands).
+- **I2 clarification:** nesting is a per-rung *floor* invariant. Additive
+  per-object grants widen visibility within a rung (two MEMBERs may differ)
+  without violating the ladder; no rung's floor exceeds the rung above.
+- **P2 → P2′.** The original P2 flip is rejected. P2′ lands documentation
+  cells only: the seeded-face agreement pin (every seeded super-bit holder
+  sits ≥ `TENANT_ADMIN`, so the axes agree on the seeded surface), the
+  **delegation cell** (a MEMBER holding a custom per-object `viewAllRecords`
+  on a private object sees all rows in-org and remains tenant-walled — the
+  pattern is load-bearing and must not be "cleaned up" by a future
+  convergence attempt), and the I7 cells. Zero behavior change. An
+  authoring-time advisory for high-privilege bit grants (via
+  `describeHighPrivilegeBits`) is tracked separately.
+
+The AI-authoring rule this yields is one sentence — *bits pick your row scope
+on an object; posture picks which tenant boundaries exist for you at all* —
+which is the smallest mental model the platform can offer an agent writing
+permissions, with no conditionally-dead declarations.
diff --git a/packages/plugins/plugin-security/src/authz-matrix-gate.test.ts b/packages/plugins/plugin-security/src/authz-matrix-gate.test.ts
index 6fa831d7e4..1f3b0050b4 100644
--- a/packages/plugins/plugin-security/src/authz-matrix-gate.test.ts
+++ b/packages/plugins/plugin-security/src/authz-matrix-gate.test.ts
@@ -32,7 +32,7 @@
 // objects) and is annotated inline.
 
 import { describe, it, expect, vi } from 'vitest';
-import { derivePosture } from '@objectstack/core';
+import { derivePosture, POSTURE_RANK } from '@objectstack/core';
 import { SecurityPlugin, hasPlatformAdminCapability } from './security-plugin.js';
 import { PermissionEvaluator } from './permission-evaluator.js';
 import { defaultPermissionSets } from './objects/default-permission-sets.js';
@@ -53,7 +53,19 @@ const publicReader: PermissionSet = {
   ],
 } as any;
 
-const ALL_SETS: PermissionSet[] = [...defaultPermissionSets, publicReader];
+// [ADR-0099 two-axis Amendment] A per-object super-bit DELEGATED to a non-admin
+// position — the auditor pattern (Salesforce object-level View All / Modify All):
+// "read (and write) every row of THIS ONE private object", granted without any
+// admin stature. This is the scope-axis primitive posture cannot represent (it is
+// per-principal × per-object); the P2′ cells below pin that it short-circuits
+// Layer 1 for the holder AND stays walled by Layer 0 (invariant I7).
+const invoiceAuditor: PermissionSet = {
+  name: 'invoice_auditor',
+  label: 'Invoice Auditor (delegated per-object view/modify all)',
+  objects: { crm_secret: { allowRead: true, allowCreate: true, allowEdit: true, viewAllRecords: true, modifyAllRecords: true } },
+} as any;
+
+const ALL_SETS: PermissionSet[] = [...defaultPermissionSets, publicReader, invoiceAuditor];
 const DENY = RLS_DENY_FILTER.id; // the fail-closed sentinel's marker value
 
 // ── Minimal middleware harness ──────────────────────────────────────────────
@@ -676,3 +688,87 @@ describe('ADR-0099 P1 — Layer 0 exemption reads the carried rung (#3211 M2)',
     expect(authzWarn).toHaveLength(0);
   });
 });
+
+// ═══════════════════════════════════════════════════════════════════════════
+// ADR-0099 P2′ — two-axis: per-object super-bit is the Layer 1 scope,
+//                posture is only the boundary (#3211 M3′)
+// ═══════════════════════════════════════════════════════════════════════════
+//
+// The two-axis Amendment (2026-07-18): the original P2 (collapse the Layer 1
+// tier onto posture) was REJECTED — Layer 1's tier input is the per-object
+// super-bit, a per-principal × per-object DELEGATION primitive that posture (one
+// rung per principal) structurally cannot carry. Collapsing it would have made a
+// declared, grantable bit conditionally inert (the ADR-0049 class) and deleted
+// the mainstream "delegate view-all of one object to a non-admin" capability.
+//
+// These are documentation cells, zero behavior change. They pin:
+//   1. the two axes AGREE on the seeded surface (every seeded super-bit holder
+//      is already >= TENANT_ADMIN — so the seeded face never needed collapsing);
+//   2. the DELEGATION cell — a MEMBER holding a delegated per-object super-bit
+//      short-circuits Layer 1 (all rows in-org) AND stays walled by Layer 0
+//      (I7). LOAD-BEARING: a future "posture convergence" cleanup MUST keep this
+//      green or it silently deletes the auditor pattern;
+//   3. I7 — the scope axis never crosses a boundary the posture axis has not
+//      opened (the holder cannot read/write/insert cross-tenant).
+describe("ADR-0099 P2′ — per-object super-bit is the Layer 1 scope axis (#3211 M3′)", () => {
+  const evaluator = new PermissionEvaluator();
+  const byName = (...names: string[]): PermissionSet[] =>
+    ALL_SETS.filter((ps) => names.includes(ps.name));
+  const tenantPlus = (evidence: { isPlatformAdmin: boolean; isTenantAdmin: boolean }): boolean =>
+    POSTURE_RANK[derivePosture(evidence)] >= POSTURE_RANK.TENANT_ADMIN;
+
+  // ── Seeded-face agreement ─────────────────────────────────────────────────
+  // On the seeded surface the two axes coincide: the ONLY seeded sets granting a
+  // super-bit are admin_full_access + organization_admin, both of which resolve
+  // to posture >= TENANT_ADMIN. So "holds the super-bit" and "posture >=
+  // TENANT_ADMIN" agree for every seeded principal — which is exactly why the
+  // seeded matrix never moved under P1, and why the collapse *looked* safe until
+  // the delegation case (below) showed the axes are not the same fact.
+  const SEEDED = [
+    { shape: 'admin_full_access holder', sets: byName('admin_full_access', 'member_default'), evidence: { isPlatformAdmin: true, isTenantAdmin: false } },
+    { shape: 'organization_admin holder', sets: byName('organization_admin', 'member_default'), evidence: { isPlatformAdmin: false, isTenantAdmin: true } },
+    { shape: 'baseline member', sets: byName('member_default'), evidence: { isPlatformAdmin: false, isTenantAdmin: false } },
+  ] as const;
+
+  it.each(SEEDED)('[seeded agreement] $shape: holds Layer 1 super-bit ⟺ posture ≥ TENANT_ADMIN', ({ sets, evidence }) => {
+    const holdsReadBit = evaluator.hasSuperuserReadBypass('crm_secret', sets as PermissionSet[], { isPrivate: true });
+    expect(holdsReadBit).toBe(tenantPlus(evidence));
+  });
+
+  // ── The delegation cell — LOAD-BEARING (the auditor pattern) ───────────────
+  // A MEMBER holding a per-object view/modify-all on ONE private object. Posture
+  // is MEMBER, so the two axes DIVERGE here (super-bit true, posture < TENANT_ADMIN)
+  // — the case the original P2 would have broken. It must: short-circuit Layer 1
+  // (see every row IN-ORG) yet stay walled by Layer 0 (org-1 only).
+  const auditor = {
+    userId: 'auditor', tenantId: 'org-1',
+    positions: ['org_member'], permissions: ['invoice_auditor'],
+    posture: 'MEMBER',
+  };
+
+  it('[delegation] MEMBER with a delegated per-object view-all sees ALL rows in-org (Layer 1 short-circuit)', async () => {
+    // Layer 1 short-circuits to null (the super-bit); Layer 0 AND-composes the
+    // org wall (posture is not PLATFORM_ADMIN) → effective read = the org wall.
+    expect(await readFilter(OBJECTS.private_obj, auditor)).toEqual({ organization_id: 'org-1' });
+  });
+
+  it('[delegation / I7] the holder stays tenant-walled on write (Layer 0 pre-image, not a full BYPASS)', async () => {
+    // modifyAllRecords short-circuits Layer 1, but isPlatformAdmin=false so Layer 0
+    // is the write pre-image: the holder is boxed to org-1 (contrast: a true
+    // platform admin returns BYPASS here). The scope bit did not cross the boundary.
+    expect(await writeFilter(OBJECTS.private_obj, auditor)).toEqual([{ organization_id: 'org-1' }]);
+  });
+
+  it('[delegation / I7] a supplied cross-tenant organization_id on insert is DENIED for the holder', async () => {
+    expect(await insertOrg(OBJECTS.private_obj, auditor, 'org-2')).toBe('CRUD_DENY:PermissionDeniedError');
+  });
+
+  // ── Contrast — the bit is a REAL, grantable capability, not conditionally inert ─
+  // Without the delegation a plain member cannot even read the private object (the
+  // wildcard grant does not cover a private posture — ADR-0066 ④). So the per-object
+  // bit is precisely what unlocks view-all; collapsing the tier onto posture would
+  // have made writing that bit a silent no-op for a member (the ADR-0049 class).
+  it('[contrast] a plain member WITHOUT the delegated bit is denied on the private object', async () => {
+    expect(await readFilter(OBJECTS.private_obj, ROLES.member)).toBe('CRUD_DENY:PermissionDeniedError');
+  });
+});