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diff --git a/‎content/docs/references/identity/identity.mdx‎
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diff --git a/‎content/docs/references/identity/organization.mdx‎
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diff --git a/‎packages/spec/src/identity/identity.test.ts‎
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diff --git a/‎packages/spec/src/identity/identity.zod.ts‎
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diff --git a/‎packages/spec/src/identity/organization.test.ts‎
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diff --git a/‎packages/spec/src/identity/organization.zod.ts‎
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@@ -0,0 +1,35 @@
+---
+"@objectstack/spec": minor
+---
+
+`UserSchema.image` and `OrganizationSchema.logo` are declared `z.string().url().nullish()` — a URL string, `null`, or the key absent are all accepted — so the user and organization bodies this platform serves parse against the schemas it publishes (#18509).
+
+Both were `z.string().url().optional()`: a URL string or the key's absence, and `null` refused. Both columns are better-auth-owned and nullable — `sys_user.image` and `sys_organization.logo` are each `Field.url({ required: false })`, reaching SQLite as `varchar(255)` with `notnull=0` — and better-auth SELECTs them and serialises them present-and-null for a user who never set an avatar and an organization created without a logo.
+
+Measured through a real `AuthManager` (better-auth 1.7.3) over a real `ObjectQL` on a real `SqliteWasmDriver`, with the platform's own `sys_user` / `sys_organization` object definitions:
+
+```
+/auth/sign-up/email            -> user.image  = null
+/auth/get-session              -> user.image  = null
+/auth/organization/create      -> logo        = null
+/auth/organization/list        -> [0].logo    = null
+/auth/organization/get-full-organization
+                               -> logo        = null
+                               -> members[].user.image = null
+
+UserSchema.safeParse(<the served session user>)
+  -> [{ path: ["image"], code: "invalid_type",
+        message: "Invalid input: expected string, received null" }]
+OrganizationSchema.safeParse(<the served organization>)
+  -> [{ path: ["logo"], code: "invalid_type",
+        message: "Invalid input: expected string, received null" }, … ]
+```
+
+Those two paths now parse.
+
+- **Measured, not inferred.** #18509 exists because PR #18501's contract review named these two siblings as *not measured* rather than folding them into the `SessionUserSchema.image` ruling it had. The verdict here comes from the probe above, run the way that ruling's own evidence was taken; the analogy was only ever a reason to look.
+- **The declaration was the thing that was wrong.** Prime Directive #12's default — fix the producer, never widen the consumer — rests on the premise it states out loud, that we own both ends. We do not: the nullable columns belong to a third-party model, so PD #12's own exit clause is the operative sentence.
+- **A pure widening.** `.nullish()`, not `.nullable()`: the key's ABSENCE is a legal shape today, so `.nullable()` would retire a live shape as the price of admitting `null`. Every body legal before this change is still legal.
+- **`.url()` is kept, and it does not fight `null`.** These two declarations carry `.url()`, which `SessionUserSchema.image` did not, so the question had to be answered rather than copied. `.nullish()` wraps the whole `z.string().url()`: `null` and `undefined` are separate branches the URL check never sees, while a present string is still required to be a well-formed URL. Of six inputs — absent, `null`, `''`, a URL, a non-URL, a number — exactly one row moves, and it is the ruled one. `''` and `'not-a-url'` are still refused.
+- **No key is added or removed** — both keys were already authored and already published, so no authorable surface moves and nothing is retired.
+- **`OrganizationSchema` is not made whole by this.** The same probe found `metadata` served present-and-null and `/auth/organization/create` omitting the required `updatedAt`. Those are separate defects with their own reasoning, filed separately rather than folded in; #18509 asked about `logo`.
@@ -63,7 +63,7 @@ const result = AccountSchema.parse(data);
 | **email** | `string` | ✅ | User email address |
 | **emailVerified** | `boolean` | optional (default: `false`) | Whether email is verified |
 | **name** | `string` | optional | User display name |
-| **image** | `string` | optional | Profile image URL |
+| **image** | `string \| null` | optional | Profile image URL |
 | **createdAt** | `string` | ✅ | Account creation timestamp |
 | **updatedAt** | `string` | ✅ | Last update timestamp |
 
 
@@ -85,7 +85,7 @@ const result = InvitationSchema.parse(data);
 | **id** | `string` | ✅ | Unique organization identifier |
 | **name** | `string` | ✅ | Organization display name |
 | **slug** | `string` | ✅ | Unique URL-friendly slug (lowercase alphanumeric, hyphens, underscores) |
-| **logo** | `string` | optional | Organization logo URL |
+| **logo** | `string \| null` | optional | Organization logo URL |
 | **metadata** | `Record<string, any>` | optional | Custom metadata |
 | **createdAt** | `string` | ✅ | Organization creation timestamp |
 | **updatedAt** | `string` | ✅ | Last update timestamp |
 
@@ -70,6 +70,69 @@ describe('UserSchema', () => {
   });
 });
 
+/**
+ * [#18509] `UserSchema.image` accepts `null` — the shape better-auth serves.
+ *
+ * `sys_user.image` is `Field.url({ required: false })`, which reaches SQLite as
+ * `image varchar(255)` with `notnull=0`. better-auth SELECTs that column and
+ * serialises it present-and-null for a user who never set an avatar, so
+ * `/auth/sign-up/email` and `/auth/get-session` both carry `"image": null`.
+ * Measured on a real `AuthManager` over ObjectQL + driver-sqlite-wasm; the
+ * evidence and its controls are in PR #18718's body.
+ *
+ * The whole accept set is pinned, not just the row that moved, so that a later
+ * flip to `.nullable()` (which would retire the legal absent-key shape) or a
+ * drop of `.url()` (which would start admitting `''` and `'not-a-url'`) goes
+ * red here rather than passing as "still accepts null".
+ */
+describe('[#18509] UserSchema.image accept set', () => {
+  const base = {
+    id: 'user_123',
+    email: 'test@example.com',
+    createdAt: '2026-01-01T00:00:00.000Z',
+    updatedAt: '2026-01-01T00:00:00.000Z',
+  };
+  /** Issue paths, so a refusal is attributed to `image` and not to a neighbour. */
+  const failedPaths = (value: unknown, present = true) => {
+    const input = present ? { ...base, image: value } : { ...base };
+    const result = UserSchema.safeParse(input);
+    return result.success ? [] : result.error.issues.map((i) => i.path.join('.'));
+  };
+
+  it('accepts `null` — the value every /auth/* user body carries', () => {
+    expect(failedPaths(null)).toEqual([]);
+  });
+
+  it('still accepts the key being ABSENT — `.nullish()`, not `.nullable()`', () => {
+    expect(failedPaths(undefined, false)).toEqual([]);
+  });
+
+  it('still accepts a well-formed URL', () => {
+    expect(failedPaths('https://example.com/avatar.jpg')).toEqual([]);
+  });
+
+  it('still refuses a malformed URL — `.url()` keeps its force on the string branch', () => {
+    expect(failedPaths('not-a-url')).toEqual(['image']);
+  });
+
+  it('still refuses the empty string', () => {
+    expect(failedPaths('')).toEqual(['image']);
+  });
+
+  it('still refuses a non-string, non-null value', () => {
+    expect(failedPaths(42)).toEqual(['image']);
+  });
+
+  it('lit control: the instrument reports a neighbour when a neighbour is wrong', () => {
+    const { email: _dropped, ...withoutEmail } = base;
+    const result = UserSchema.safeParse({ ...withoutEmail, image: null });
+    expect(result.success).toBe(false);
+    if (!result.success) {
+      expect(result.error.issues.map((i) => i.path.join('.'))).toEqual(['email']);
+    }
+  });
+});
+
 describe('AccountSchema', () => {
   it('should accept valid OAuth account', () => {
     const account: Account = {
 
@@ -40,9 +40,40 @@ export const UserSchema = lazySchema(() => z.object({
   name: z.string().optional().describe('User display name'),
 
   /**
-   * User's profile image URL
-   */
-  image: z.string().url().optional().describe('Profile image URL'),
+   * User's profile image URL.
+   *
+   * `null` is accepted alongside a URL string and alongside the key being
+   * absent. better-auth owns this column, `sys_user.image` is declared
+   * `Field.url({ required: false })` and reaches SQLite as
+   * `image varchar(255)` with `notnull=0`, and better-auth SELECTs it and
+   * serialises it present-and-null for a user who never set an avatar. Measured
+   * on a real `AuthManager` over ObjectQL + driver-sqlite-wasm (#18509): the
+   * `/auth/sign-up/email` and `/auth/get-session` bodies both carry
+   * `"image": null`, and so does `members[].user.image` inside
+   * `/auth/organization/get-full-organization`. The declaration was the thing
+   * that was wrong — Prime Directive #12's default (fix the producer, never
+   * widen the consumer) rests on the premise it states out loud, that we own
+   * both ends, which does not hold for a third-party model.
+   *
+   * Same defect and same remedy as `SessionUserSchema.image` (#17235 / PR
+   * #18501, ruling batch #138 item 1), reached here by measurement rather than
+   * by analogy — #18509 exists precisely because that review refused to infer
+   * this key's verdict from that one.
+   *
+   * `.nullish()`, NOT `.nullable()`: the key's ABSENCE is a legal shape today,
+   * so `.nullable()` would retire a live shape as the price of admitting
+   * `null`. Pure widening only.
+   *
+   * `.url()` is KEPT, and it is not in tension with `null`. `.nullish()` wraps
+   * the whole `z.string().url()`, so `null` and `undefined` are separate
+   * branches the URL check never sees, while a present string is still required
+   * to be a well-formed URL. Measured: of the six inputs
+   * (absent / `null` / `''` / a URL / a non-URL / a number) exactly ONE moves,
+   * and it is the ruled one — `''` and `'not-a-url'` are still refused, which
+   * is why the empty-avatar-URL boundary note carried on #18509 does not become
+   * live here the way it would on a declaration without `.url()`.
+   */
+  image: z.string().url().nullish().describe('Profile image URL'),
 
   /**
    * Account creation timestamp
 
@@ -115,6 +115,97 @@ describe('OrganizationSchema', () => {
   });
 });
 
+/**
+ * [#18509] `OrganizationSchema.logo` accepts `null` — the shape better-auth
+ * serves.
+ *
+ * `logo` is one of better-auth's own `sys_organization` columns, declared
+ * `Field.url({ required: false })` and reaching SQLite as `logo varchar(255)`
+ * with `notnull=0`. `/auth/organization/create`, `/auth/organization/list` and
+ * `/auth/organization/get-full-organization` all serve `"logo": null` for an
+ * organization created without one. Measured on a real `AuthManager` over
+ * ObjectQL + driver-sqlite-wasm; evidence and controls in PR #18718's body.
+ *
+ * The whole accept set is pinned, not just the row that moved — see the sibling
+ * block in `identity.test.ts` for why.
+ */
+describe('[#18509] OrganizationSchema.logo accept set', () => {
+  const base = {
+    id: 'org_123',
+    name: 'Acme Corporation',
+    slug: 'acme-corp',
+    createdAt: '2026-01-01T00:00:00.000Z',
+    updatedAt: '2026-01-01T00:00:00.000Z',
+  };
+  const failedPaths = (value: unknown, present = true) => {
+    const input = present ? { ...base, logo: value } : { ...base };
+    const result = OrganizationSchema.safeParse(input);
+    return result.success ? [] : result.error.issues.map((i) => i.path.join('.'));
+  };
+
+  it('accepts `null` — the value every organization body carries', () => {
+    expect(failedPaths(null)).toEqual([]);
+  });
+
+  it('still accepts the key being ABSENT — `.nullish()`, not `.nullable()`', () => {
+    expect(failedPaths(undefined, false)).toEqual([]);
+  });
+
+  it('still accepts a well-formed URL', () => {
+    expect(failedPaths('https://example.com/logo.png')).toEqual([]);
+  });
+
+  it('still refuses a malformed URL — `.url()` keeps its force on the string branch', () => {
+    expect(failedPaths('not-a-url')).toEqual(['logo']);
+  });
+
+  it('still refuses the empty string', () => {
+    expect(failedPaths('')).toEqual(['logo']);
+  });
+
+  it('still refuses a non-string, non-null value', () => {
+    expect(failedPaths(42)).toEqual(['logo']);
+  });
+
+  it('lit control: the instrument reports a neighbour when a neighbour is wrong', () => {
+    const { slug: _dropped, ...withoutSlug } = base;
+    const result = OrganizationSchema.safeParse({ ...withoutSlug, logo: null });
+    expect(result.success).toBe(false);
+    if (!result.success) {
+      expect(result.error.issues.map((i) => i.path.join('.'))).toEqual(['slug']);
+    }
+  });
+
+  /**
+   * ⛔ Scope fence, deliberately pinned as CURRENT behaviour rather than fixed:
+   * the same measurement found `metadata` served present-and-null and
+   * `/auth/organization/create` omitting the required `updatedAt`. Those are
+   * separate defects, filed separately — #18509 asked about `logo`. This pin
+   * exists so that the fence is visible and so that a later fix for either one
+   * has to come here and say so.
+   */
+  it('does NOT (yet) accept a served body whole — metadata/updatedAt are separate cards', () => {
+    const served = {
+      id: 'org_123',
+      name: 'Acme Corporation',
+      slug: 'acme-corp',
+      logo: null,
+      metadata: null,
+      createdAt: '2026-01-01T00:00:00.000Z',
+      // `updatedAt` absent, exactly as `/auth/organization/create` serves it
+    };
+    const result = OrganizationSchema.safeParse(served);
+    expect(result.success).toBe(false);
+    if (!result.success) {
+      // `logo` is gone from this list — that is this card's contribution.
+      expect(result.error.issues.map((i) => i.path.join('.')).sort()).toEqual([
+        'metadata',
+        'updatedAt',
+      ]);
+    }
+  });
+});
+
 describe('MemberSchema', () => {
   it('should accept valid member data', () => {
     const member: Member = {
 
@@ -36,9 +36,41 @@ export const OrganizationSchema = lazySchema(() => z.object({
     .describe('Unique URL-friendly slug (lowercase alphanumeric, hyphens, underscores)'),
 
   /**
-   * Organization logo URL
-   */
-  logo: z.string().url().optional().describe('Organization logo URL'),
+   * Organization logo URL.
+   *
+   * `null` is accepted alongside a URL string and alongside the key being
+   * absent. `logo` is one of better-auth's own `sys_organization` columns,
+   * declared `Field.url({ required: false })` and reaching SQLite as
+   * `logo varchar(255)` with `notnull=0`; better-auth serialises it
+   * present-and-null for an organization created without one. Measured on a
+   * real `AuthManager` over ObjectQL + driver-sqlite-wasm (#18509): the
+   * `/auth/organization/create`, `/auth/organization/list` and
+   * `/auth/organization/get-full-organization` bodies all carry `"logo": null`.
+   *
+   * Same defect and same remedy as `SessionUserSchema.image` (#17235 / PR
+   * #18501, ruling batch #138 item 1), reached here by measurement rather than
+   * by analogy — #18509 exists precisely because that review refused to infer
+   * this key's verdict from that one.
+   *
+   * `.nullish()`, NOT `.nullable()`: the key's ABSENCE is a legal shape today,
+   * so `.nullable()` would retire a live shape as the price of admitting
+   * `null`. Pure widening only.
+   *
+   * `.url()` is KEPT, and it is not in tension with `null`. `.nullish()` wraps
+   * the whole `z.string().url()`, so `null` and `undefined` are separate
+   * branches the URL check never sees, while a present string is still required
+   * to be a well-formed URL. Measured: of the six inputs
+   * (absent / `null` / `''` / a URL / a non-URL / a number) exactly ONE moves,
+   * and it is the ruled one.
+   *
+   * ⚠️ This widening does NOT make a served organization body parse clean.
+   * The same measurement found two further divergences on this schema —
+   * `metadata` is served present-and-null, and `/auth/organization/create`
+   * omits `updatedAt`, which is declared required. Those are separate defects
+   * with their own reasoning and are filed separately rather than folded in
+   * here; #18509 asked about `logo`.
+   */
+  logo: z.string().url().nullish().describe('Organization logo URL'),
 
   /**
    * Custom metadata for the organization