@@ -0,0 +1,39 @@
+---
+'@objectstack/spec': minor
+---
+
+React-tier `<ListView>`: the `onNavigate` declaration becomes
+`(recordId, action: 'view' | 'new_window') => void` — a declared value **no branch ever
+emitted** is removed, and the value **two reference call sites do emit** is added.
+
+`REACT_BLOCKS`' ListView overlay declared the second argument as `'view' | 'edit'`. That
+sentence was false in both directions. `'edit'` is emitted by no call site in the
+reference implementation and read by no branch; `'new_window'` — what a Cmd/Ctrl- or
+middle-click, and an authored `navigation: { mode: 'new_window' }`, actually send — was
+not declared at all. An author reading this contract wrote a handler with one dead arm
+and one missing arm.
+
+The second argument is a navigation-MODE token with a **closed vocabulary**, and the
+declaration now says so. That closedness is not new: the protocol's own retirement note
+for `view.list.navigation.view` (removed in 17.5.0, ADR-0049) records that anything
+outside the mode vocabulary "matched no branch". What this change corrects is the
+membership of the vocabulary, not its closedness.
+
+## FROM → TO
+
+| you wrote | write instead |
+| --- | --- |
+| `onNavigate={(id, action) => { if (action === 'edit') … }}` | delete that arm — nothing ever called it |
+| a handler with no `'new_window'` arm | handle `'new_window'`: open the record in a new browser tab. Omitting the arm leaves the modifier-click path doing nothing |
+| `onNavigate={(id) => …}` (one argument) | unchanged — the arity is untouched |
+
+**The one-line fix:** replace the `'edit'` arm with a `'new_window'` arm.
+
+Scope: this moves a **declaration**, not a type or a runtime check. `REACT_BLOCKS` types
+this prop as a documentation string (`ReactBlockDef[]`), so no `.d.ts` signature moves
+and nothing that compiles today stops compiling. The behaviour it describes is the
+reference implementation's, which already emits exactly these two values; the sibling's
+four declaration faces are corrected under objectui#9547 and its bump to
+`@objectstack/spec` >= 17.5.0.
+
+Clause-②: yes
@@ -318,7 +318,7 @@ export const REACT_BLOCKS: ReactBlockDef[] = [
       { name: 'filters', type: "FilterArray e.g. ['status','=','active']", kind: 'controlled', description: 'ObjectQL base filter; drive from React state for tabbed/searched lists. ([field, op, value]; ops =, !=, >, <, contains, in; compound: [\"and\", […], […]]).' },
       { name: 'navigation', type: "{ mode: 'page' | 'drawer' | 'modal' | 'split' | 'none' }", kind: 'binding', description: 'What a row click does. Use { mode: \"none\" } when you handle clicks via onRowClick.' },
       { name: 'onRowClick', type: '(record) => void', kind: 'callback', description: "Called with the clicked row's record — the hook for master/detail." },
-      { name: 'onNavigate', type: "(recordId, action: 'view' | 'edit') => void", kind: 'callback', description: 'Called for page-level navigation.' },
+      { name: 'onNavigate', type: "(recordId, action: 'view' | 'new_window') => void", kind: 'callback', description: "Called for page-level navigation. The second argument is a navigation-MODE token from a CLOSED vocabulary — 'view' opens the record page, 'new_window' opens it in a new browser tab; the reference implementation emits no other value and reads no other branch." },
       { name: 'fields', type: 'string[]', kind: 'binding', description: 'Limit/order the columns shown (defaults to the object list fields).' },
       { name: 'options', type: 'Record<string, any>', kind: 'binding', description: 'View-type-specific options bag (kanban/calendar/gantt extras); prefer the typed spec props where they exist.' },
     ],
 
@@ -64,7 +64,7 @@ Server-connected object table with toolbar and switchable visualizations (grid/k
 | `options` | `Record<string, any>` | binding |  | View-type-specific options bag (kanban/calendar/gantt extras); prefer the typed spec props where they exist. |
 | `filters` | `FilterArray e.g. ['status','=','active']` | controlled |  | ObjectQL base filter; drive from React state for tabbed/searched lists. ([field, op, value]; ops =, !=, >, <, contains, in; compound: ["and", […], […]]). |
 | `onRowClick` | `(record) => void` | callback |  | Called with the clicked row's record — the hook for master/detail. |
-| `onNavigate` | `(recordId, action: 'view' \| 'edit') => void` | callback |  | Called for page-level navigation. |
+| `onNavigate` | `(recordId, action: 'view' \| 'new_window') => void` | callback |  | Called for page-level navigation. The second argument is a navigation-MODE token from a CLOSED vocabulary — 'view' opens the record page, 'new_window' opens it in a new browser tab; the reference implementation emits no other value and reads no other branch. |
 | `columns` | `string[] \| object[]` | data | ✓ | Fields to display as columns |
 | `type` | `'grid' \| 'kanban' \| 'gallery' \| 'calendar' \| 'timeline' \| 'gantt' \| 'map' \| 'chart' \| 'tree'` | data |  |  |
 | `sort` | `object[]` | data |  |  |