diff --git a/docs/guide/hub.md b/docs/guide/hub.md
index 95cc8e0..cda6ef7 100644
--- a/docs/guide/hub.md
+++ b/docs/guide/hub.md
@@ -199,8 +199,42 @@ ctx.docks.register({
 
 `groupId` lives on every entry kind, so iframes, launchers, custom-render views, and integration-contributed types (e.g. json-render panels) all join groups the same way. The group and its members stay independent top-level entries in `devframe:docks`; a downstream UI derives the visual collapse by matching each member's `groupId` to the group's `id` and renders members in a popover or sub-navigation. `defaultChildId` names the member opened when the group button is activated.
 
+### The dual role of `category`
+
+`category` decides an entry's outer bucket on the dock bar (ordered by `DEFAULT_CATEGORIES_ORDER`) — but its meaning shifts once an entry joins a group:
+
+- **Ungrouped entry** — `category` is the entry's outer dock-bar bucket, defaulting to `'default'`.
+- **Grouped entry** (a `groupId` that resolves to a registered group) — the outer bucket comes from the **group's** own `category` instead. The member's own `category` is reinterpreted as an **in-group sub-category** that sub-divides and sorts members inside the group's popover / sub-navigation.
+
+The group's `category` is therefore the single outer bucket shared by the group button and all its members. Fallbacks keep the rule total:
+
+- A **group** with no `category` buckets itself and its members under `'default'`.
+- A grouped **member** with no `category` defaults its in-group sub-category to `'default'`.
+- **Orphan tolerance** — a member whose `groupId` never resolves to a registered group renders as a normal top-level entry and uses its **own** `category` as the outer bucket, exactly as an ungrouped entry does.
+
+In the example above, `nuxt:overview` renders under the `framework` bucket (from the `nuxt` group) even though it could carry its own `category`; that own `category` would only sort it against sibling members inside the Nuxt group.
+
 Grouping is one level deep: members join a group, and a group is always a top-level button. A member whose group is never registered renders as a normal top-level entry, so registration order is free.
 
+#### Known categories
+
+`DEFAULT_CATEGORIES_ORDER` (exported from `@devframes/hub`, `@devframes/hub/node`, `@devframes/hub/client` and `@devframes/hub/constants`) names the buckets the hub orders by default, reading from "closest to your app" toward "peripheral":
+
+| Category | Weight | Typical use |
+|---|---|---|
+| `framework` | `-100` | Framework internals (Vue / Nuxt / Vite). |
+| `default` | `0` | Uncategorized entries. |
+| `app` | `100` | The user's own app tools. |
+| `ui` | `150` | Components, design system, styling. |
+| `data` | `250` | State, storage, queries, database. |
+| `web` | `300` | Network, platform, accessibility. |
+| `performance` | `350` | Profiling, metrics, budgets. |
+| `advanced` | `400` | Power-user / low-level tools. |
+| `docs` | `500` | Documentation, references. |
+| `~builtin` | `1000` | The viewer's own built-in views; always last. |
+
+The gaps are intentional — a kit can interleave its own category ids (or override any weight) without editing this table. An unknown category sorts as weight `0`.
+
 ## The protocol — what the UI sees
 
 A hub-aware UI doesn't import any hub classes; it reads three shared-state keys and one RPC method:
diff --git a/packages/hub/src/client/__tests__/host.test.ts b/packages/hub/src/client/__tests__/host.test.ts
index 648a9f1..db214ab 100644
--- a/packages/hub/src/client/__tests__/host.test.ts
+++ b/packages/hub/src/client/__tests__/host.test.ts
@@ -62,6 +62,10 @@ function iframeEntry(id: string, extra?: Record<string, unknown>): DevframeDockE
   return { id, title: id, icon: 'ph:cube', type: 'iframe', url: `/__${id}/`, ...extra } as DevframeDockEntry
 }
 
+function groupEntry(id: string, extra?: Record<string, unknown>): DevframeDockEntry {
+  return { id, title: id, icon: 'ph:folder', type: 'group', ...extra } as DevframeDockEntry
+}
+
 describe('createDevframeClientHost', () => {
   it('publishes the global client context with the full surface', async () => {
     const { rpc } = createStubRpc()
@@ -95,6 +99,46 @@ describe('createDevframeClientHost', () => {
     host.dispose()
   })
 
+  it('groups entries by category — grouped members bucket under their group, orphans by their own', async () => {
+    const { rpc, states } = createStubRpc()
+    const host = await createDevframeClientHost({ rpc })
+
+    states.get('devframe:docks')!.push([
+      // (a) member with groupId + its own category → outer bucket = group's category ('framework'),
+      // and its own 'app' category is reinterpreted as an in-group sub-category.
+      groupEntry('nuxt', { category: 'framework' }),
+      iframeEntry('nuxt:overview', { groupId: 'nuxt', category: 'app' }),
+      // (b) group with no category → members bucket to 'default'.
+      groupEntry('misc'),
+      iframeEntry('misc:one', { groupId: 'misc', category: 'web' }),
+      // (c) orphan member (groupId with no registered group) → its own category ('web').
+      iframeEntry('orphan', { groupId: 'ghost', category: 'web' }),
+      // plain ungrouped entry keeps its own category.
+      iframeEntry('plain', { category: 'app' }),
+    ])
+
+    const grouped = Object.fromEntries(
+      host.context.docks.groupedEntries.map(([cat, entries]) => [cat, entries.map(e => e.id)]),
+    )
+
+    // (a) grouped member lands under the group's category, alongside the group button.
+    expect(grouped.framework).toEqual(['nuxt', 'nuxt:overview'])
+    // (b) group without a category, and its member, bucket to 'default'.
+    expect(grouped.default).toEqual(['misc', 'misc:one'])
+    // (c) orphan + plain keep their own categories.
+    expect(grouped.web).toEqual(['orphan'])
+    expect(grouped.app).toEqual(['plain'])
+
+    // Categories sort by DEFAULT_CATEGORIES_ORDER — framework first.
+    expect(host.context.docks.groupedEntries.map(([cat]) => cat)).toEqual([
+      'framework',
+      'default',
+      'app',
+      'web',
+    ])
+    host.dispose()
+  })
+
   it('switches entries with activation/deactivation events and when-context updates', async () => {
     const { rpc, states } = createStubRpc()
     const host = await createDevframeClientHost({ rpc })
diff --git a/packages/hub/src/client/host.ts b/packages/hub/src/client/host.ts
index d2ff89c..7abd376 100644
--- a/packages/hub/src/client/host.ts
+++ b/packages/hub/src/client/host.ts
@@ -479,9 +479,22 @@ function createPanelContext(clientType: DockClientType): DocksPanelContext {
 }
 
 function groupByCategory(entries: DevframeDockEntry[]): DevframeDockEntriesGrouped {
+  // Index registered groups so a member whose `groupId` resolves takes its
+  // OUTER bucket from the group's category, not its own (which becomes the
+  // member's in-group sub-category). Orphan members — a `groupId` with no
+  // registered group — fall back to their own category.
+  const groupsById = new Map<string, DevframeDockEntry>()
+  for (const entry of entries) {
+    if (entry.type === 'group')
+      groupsById.set(entry.id, entry)
+  }
+
   const groups = new Map<string, DevframeDockEntry[]>()
   for (const entry of entries) {
-    const category = entry.category ?? 'default'
+    const resolvedGroup = entry.groupId ? groupsById.get(entry.groupId) : undefined
+    const category = resolvedGroup
+      ? resolvedGroup.category ?? 'default'
+      : entry.category ?? 'default'
     let list = groups.get(category)
     if (!list) {
       list = []
diff --git a/packages/hub/src/client/index.ts b/packages/hub/src/client/index.ts
index 2c91c62..020912a 100644
--- a/packages/hub/src/client/index.ts
+++ b/packages/hub/src/client/index.ts
@@ -1,3 +1,6 @@
+// Re-export the category-order table so client-side viewers can import the
+// single source of truth from `@devframes/hub/client`.
+export { DEFAULT_CATEGORIES_ORDER } from '../constants'
 export * from './client-script'
 export * from './context'
 export * from './docks'
diff --git a/packages/hub/src/constants.ts b/packages/hub/src/constants.ts
index 474884b..f49665e 100644
--- a/packages/hub/src/constants.ts
+++ b/packages/hub/src/constants.ts
@@ -2,12 +2,26 @@ import type { DevframeDocksUserSettings } from './types/settings'
 
 export * from 'devframe/constants'
 
+/**
+ * The default ordering weight for each known dock category — lower sorts
+ * earlier. Downstream viewers (e.g. `@vitejs/devtools-kit`) import this as the
+ * single source of truth so the hub and its viewers agree on category order.
+ * `framework` sorts first; `~builtin` (the viewer's own built-in views) last.
+ *
+ * The buckets read from "closest to your app" → "platform / analysis" →
+ * "peripheral". Gaps between the weights are intentional: a kit can interleave
+ * its own categories (or override these) without editing this table.
+ */
 export const DEFAULT_CATEGORIES_ORDER: Record<string, number> = {
+  'framework': -100,
   'default': 0,
   'app': 100,
-  'framework': 200,
+  'ui': 150,
+  'data': 250,
   'web': 300,
+  'performance': 350,
   'advanced': 400,
+  'docs': 500,
   '~builtin': 1000,
 }
 
diff --git a/packages/hub/src/index.ts b/packages/hub/src/index.ts
index fca59c2..ddcfb09 100644
--- a/packages/hub/src/index.ts
+++ b/packages/hub/src/index.ts
@@ -1,2 +1,3 @@
+export { DEFAULT_CATEGORIES_ORDER } from './constants'
 export * from './define'
 export type * from './types'
diff --git a/packages/hub/src/node/index.ts b/packages/hub/src/node/index.ts
index c5160de..8e4678d 100644
--- a/packages/hub/src/node/index.ts
+++ b/packages/hub/src/node/index.ts
@@ -1,3 +1,6 @@
+// Re-export the category-order table so node-side consumers can import the
+// single source of truth from `@devframes/hub/node`.
+export { DEFAULT_CATEGORIES_ORDER } from '../constants'
 export * from './context'
 export * from './host-commands'
 export * from './host-docks'
diff --git a/packages/hub/src/types/docks.ts b/packages/hub/src/types/docks.ts
index fba10e0..c898e87 100644
--- a/packages/hub/src/types/docks.ts
+++ b/packages/hub/src/types/docks.ts
@@ -50,15 +50,20 @@ export interface DevframeDocksActiveState {
   activation: DevframeDockActivation | null
 }
 
-// Known categories the hub orders by default. Kits may pass their own
-// category ids; `(string & {})` keeps autocomplete on the known set while
+// Known categories the hub orders by default (see
+// {@link import('../constants').DEFAULT_CATEGORIES_ORDER}). Kits may pass their
+// own category ids; `(string & {})` keeps autocomplete on the known set while
 // allowing arbitrary string values. `~builtin` is reserved for the viewer's
 // own built-in views (see {@link DevframeViewBuiltin}) and always sorts last.
 export type DevframeDockEntryCategory
-  = | 'app'
-    | 'framework'
-    | 'web'
-    | 'advanced'
+  = | 'framework' // framework internals (Vue / Nuxt / Vite)
+    | 'app' // the user's own app tools
+    | 'ui' // components, design system, styling
+    | 'data' // state, storage, queries, database
+    | 'web' // network, platform, accessibility
+    | 'performance' // profiling, metrics, budgets
+    | 'advanced' // power-user / low-level tools
+    | 'docs' // documentation, references
     | 'default'
     | '~builtin'
     | (string & {})
@@ -76,7 +81,19 @@ export interface DevframeDockEntryBase {
    */
   defaultOrder?: number
   /**
-   * The category of the entry
+   * The category of the entry — a field with a dual role that depends on
+   * whether {@link groupId} resolves to a registered {@link DevframeViewGroup}:
+   *
+   * - **Ungrouped (or orphan) entry** — `category` is the entry's OUTER bucket
+   *   on the dock bar, ordered by {@link import('../constants').DEFAULT_CATEGORIES_ORDER}.
+   * - **Grouped entry** (a `groupId` that resolves to a registered group) —
+   *   the OUTER bucket is instead the group's own `category`, and this field is
+   *   reinterpreted as the entry's IN-GROUP sub-category, used to sub-divide and
+   *   sort members inside the group's popover / sub-navigation.
+   *
+   * Falls back to `'default'` when omitted — both as an outer bucket and, for a
+   * grouped member, as its in-group sub-bucket.
+   *
    * @default 'default'
    */
   category?: DevframeDockEntryCategory
@@ -102,8 +119,14 @@ export interface DevframeDockEntryBase {
    *
    * This is a flat pointer — membership, not containment. The entry stays an
    * independently-registered, top-level entry; only its rendering is grouped
-   * downstream. If the referenced group is never registered, the entry renders
-   * as a normal top-level entry (orphan tolerance).
+   * downstream.
+   *
+   * When the referenced group **is** registered, it supplies the entry's OUTER
+   * dock-bar category (the group's own {@link category}), and this entry's own
+   * {@link category} is reinterpreted as its IN-GROUP sub-category. When the
+   * referenced group is **never** registered, the entry renders as a normal
+   * top-level entry and falls back to using its own {@link category} as the
+   * outer bucket (orphan tolerance).
    *
    * @see {@link DevframeViewGroup}
    */
@@ -277,6 +300,12 @@ export interface DevframeViewJsonRender extends DevframeDockEntryBase {
  * through the same `register`/`update`/`values` machinery as every other entry,
  * keyed by `id`.
  *
+ * The group's `category` is the OUTER bucket for the group button itself AND
+ * for every one of its members — a member's own `category` no longer decides
+ * its outer bucket, but is reinterpreted as an in-group sub-category that
+ * sub-divides and sorts members inside this group. A group with no `category`
+ * buckets itself and its members under `'default'`.
+ *
  * Grouping is one level deep: a group entry must not itself set `groupId`.
  */
 export interface DevframeViewGroup extends DevframeDockEntryBase {
diff --git a/tests/__snapshots__/tsnapi/@devframes/hub/client.snapshot.d.ts b/tests/__snapshots__/tsnapi/@devframes/hub/client.snapshot.d.ts
index aaf444c..334ca62 100644
--- a/tests/__snapshots__/tsnapi/@devframes/hub/client.snapshot.d.ts
+++ b/tests/__snapshots__/tsnapi/@devframes/hub/client.snapshot.d.ts
@@ -136,6 +136,7 @@ export * from "devframe/client";
 // #endregion
 
 // #region Other
+export { DEFAULT_CATEGORIES_ORDER }
 export { DevframeClientRpcHost }
 export { RpcClientEvents }
 // #endregion
\ No newline at end of file
diff --git a/tests/__snapshots__/tsnapi/@devframes/hub/client.snapshot.js b/tests/__snapshots__/tsnapi/@devframes/hub/client.snapshot.js
index 79c9f6e..0331cf7 100644
--- a/tests/__snapshots__/tsnapi/@devframes/hub/client.snapshot.js
+++ b/tests/__snapshots__/tsnapi/@devframes/hub/client.snapshot.js
@@ -16,4 +16,8 @@ export var CLIENT_CONTEXT_KEY /* const */
 
 // #region Re-exports
 export * from "devframe/client";
+// #endregion
+
+// #region Other
+export { DEFAULT_CATEGORIES_ORDER }
 // #endregion
\ No newline at end of file
diff --git a/tests/__snapshots__/tsnapi/@devframes/hub/index.snapshot.d.ts b/tests/__snapshots__/tsnapi/@devframes/hub/index.snapshot.d.ts
index 5ae4bb6..32d68dd 100644
--- a/tests/__snapshots__/tsnapi/@devframes/hub/index.snapshot.d.ts
+++ b/tests/__snapshots__/tsnapi/@devframes/hub/index.snapshot.d.ts
@@ -20,6 +20,7 @@ export declare const defineHubRpcFunction: <NAME extends string, TYPE extends im
 export { ClientScriptEntry }
 export { ConnectionMeta }
 export { CreateHubContextOptions }
+export { DEFAULT_CATEGORIES_ORDER }
 export { DevframeCapabilities }
 export { DevframeChildProcessExecuteOptions }
 export { DevframeChildProcessOutput }
diff --git a/tests/__snapshots__/tsnapi/@devframes/hub/index.snapshot.js b/tests/__snapshots__/tsnapi/@devframes/hub/index.snapshot.js
index b50f2b5..9fdd85b 100644
--- a/tests/__snapshots__/tsnapi/@devframes/hub/index.snapshot.js
+++ b/tests/__snapshots__/tsnapi/@devframes/hub/index.snapshot.js
@@ -2,6 +2,7 @@
  * Generated by tsnapi — public API snapshot of `@devframes/hub`
  */
 // #region Other
+export { DEFAULT_CATEGORIES_ORDER }
 export { defineCommand }
 export { defineDockEntry }
 export { defineHubRpcFunction }
diff --git a/tests/__snapshots__/tsnapi/@devframes/hub/node.snapshot.d.ts b/tests/__snapshots__/tsnapi/@devframes/hub/node.snapshot.d.ts
index b1e1228..1bb6d73 100644
--- a/tests/__snapshots__/tsnapi/@devframes/hub/node.snapshot.d.ts
+++ b/tests/__snapshots__/tsnapi/@devframes/hub/node.snapshot.d.ts
@@ -276,5 +276,6 @@ export declare const hubTerminalsWrite: {
 // #region Other
 export { createHubContext }
 export { CreateHubContextOptions }
+export { DEFAULT_CATEGORIES_ORDER }
 export { DevframeHubContext }
 // #endregion
\ No newline at end of file
diff --git a/tests/__snapshots__/tsnapi/@devframes/hub/node.snapshot.js b/tests/__snapshots__/tsnapi/@devframes/hub/node.snapshot.js
index 649f7ee..4677d5b 100644
--- a/tests/__snapshots__/tsnapi/@devframes/hub/node.snapshot.js
+++ b/tests/__snapshots__/tsnapi/@devframes/hub/node.snapshot.js
@@ -91,4 +91,8 @@ export var hubTerminalsResize /* const */
 export var hubTerminalsRestart /* const */
 export var hubTerminalsTerminate /* const */
 export var hubTerminalsWrite /* const */
+// #endregion
+
+// #region Other
+export { DEFAULT_CATEGORIES_ORDER }
 // #endregion
\ No newline at end of file