microsoft
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diff --git a/‎doc/devdocs/modules/cmdpal/extension-gallery.md‎
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diff --git a/‎src/modules/cmdpal/Microsoft.CmdPal.Common/ExtensionGallery/Models/GalleryExtensionEntry.cs‎
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@@ -209,6 +209,7 @@ Bilibili
 BVID
 capturevideosample
 cmdow
+contoso
 Contoso
 Controlz
 cortana
 
@@ -105,13 +105,13 @@
 ^src/common/ManagedCommon/ColorFormatHelper\.cs$
 ^src/common/notifications/BackgroundActivatorDLL/cpp\.hint$
 ^src/common/sysinternals/Eula/
-^src/modules/cmdpal/Tests/Microsoft\.CommandPalette\.Extensions\.Toolkit\.UnitTests/FuzzyMatcherComparisonTests.cs$
-^src/modules/cmdpal/Tests/Microsoft\.CommandPalette\.Extensions\.Toolkit\.UnitTests/FuzzyMatcherDiacriticsTests.cs$
 ^doc/devdocs/modules/cmdpal/initial-sdk-spec/list-elements-mock-002\.pdn$
 ^src/modules/cmdpal/ext/SamplePagesExtension/Pages/SampleMarkdownImagesPage\.cs$
 ^src/modules/cmdpal/Microsoft\.CmdPal\.UI/Settings/InternalPage\.SampleData\.cs$
 ^src/modules/cmdpal/Tests/Microsoft\.CmdPal\.Common\.UnitTests/.*\.TestData\.cs$
 ^src/modules/cmdpal/Tests/Microsoft\.CmdPal\.Common\.UnitTests/Text/.*\.cs$
+^src/modules/cmdpal/Tests/Microsoft\.CommandPalette\.Extensions\.Toolkit\.UnitTests/FuzzyMatcherComparisonTests.cs$
+^src/modules/cmdpal/Tests/Microsoft\.CommandPalette\.Extensions\.Toolkit\.UnitTests/FuzzyMatcherDiacriticsTests.cs$
 ^src/modules/colorPicker/ColorPickerUI/Shaders/GridShader\.cso$
 ^src/modules/launcher/Plugins/Microsoft\.PowerToys\.Run\.Plugin\.TimeDate/Properties/
 ^src/modules/MouseUtils/MouseJumpUI/MainForm\.resx$
 
@@ -1534,6 +1534,7 @@ resmimetype
 RESOURCEID
 RESTORETOMAXIMIZED
 RETURNONLYFSDIRS
+Revalidates
 RGBQUAD
 rgbs
 rgelt
 
@@ -0,0 +1,167 @@
+# Command Palette Extension Gallery
+
+This document describes how Command Palette (CmdPal) discovers extensions for
+the in-app **Extension gallery** page.
+
+## At a glance
+
+- The gallery loads a single JSON feed called `extensions.json` from a remote
+  HTTPS URL, parses it, and renders the entries.
+- The default feed lives in the external repo
+  **`microsoft/CmdPal-Extensions`** at
+  `https://aka.ms/CmdPal-ExtensionsJson`.
+- Feed content + icon images are cached on disk so the page works offline and
+  survives short network hiccups.
+- There is no WinGet discovery, no per-extension `manifest.json` fetch, and no
+  other network call for rendering the list.
+
+## Implementation pointers
+
+| Concern | File |
+| --- | --- |
+| Fetching, parsing, caching, pruning | `Microsoft.CmdPal.Common/ExtensionGallery/Services/ExtensionGalleryService.cs` |
+| Resolving which URL to fetch | `Microsoft.CmdPal.Common/ExtensionGallery/Services/GalleryFeedUrlProvider.cs` + `Microsoft.CmdPal.UI/Helpers/GalleryServiceRegistration.cs` |
+| HTTP + on-disk cache | `Microsoft.CmdPal.Common/ExtensionGallery/Services/ExtensionGalleryHttpClient.cs` (wraps `Microsoft.CmdPal.Common/Services/HttpCaching/HttpCachingClient`) |
+| Feed + entry models | `Microsoft.CmdPal.Common/ExtensionGallery/Models/` |
+
+## Feed URL resolution
+
+`ExtensionGalleryService.GetFeedUrl()` returns, in order:
+
+1. The user-configured URL from CmdPal settings (`SettingsModel.GalleryFeedUrl`,
+   exposed via the hidden `InternalPage` settings page). Any non-empty value
+   wins. Mostly used for local testing against a custom feed.
+2. Otherwise, the built-in default
+   `https://aka.ms/CmdPal-ExtensionsJson`.
+
+Local `file://` URIs are allowed too — `FetchFeedDocumentAsync` reads the file
+directly and bypasses the HTTP cache.
+
+## Feed format
+
+The feed is a single wrapped JSON document with inline entries:
+
+```json
+{
+  "$schema": "https://raw.githubusercontent.com/microsoft/CmdPal-Extensions/main/.github/schemas/gallery.schema.json",
+  "extensions": [
+    {
+      "id": "sample-extension",
+      "title": "Sample Extension",
+      "description": "A sample extension demonstrating the gallery feed format.",
+      "author": { "name": "Microsoft", "url": "https://github.com/microsoft" },
+      "homepage": "https://github.com/microsoft/CmdPal-Extensions",
+      "iconUrl": "https://.../icon.png",
+      "screenshotUrls": ["https://.../screenshot-1.png"],
+      "tags": ["sample"],
+      "installSources": [
+        { "type": "winget",  "id":  "Contoso.SampleExtension" },
+        { "type": "msstore", "id":  "9P…" },
+        { "type": "url",     "uri": "https://github.com/contoso/sample/releases/latest" }
+      ],
+      "detection": { "packageFamilyName": "Contoso.SampleExtension_1234567890abc" }
+    }
+  ]
+}
+```
+
+Only the `extensions` array is read at runtime. The authoritative JSON
+schema for an entry lives in the upstream feed repo
+([`microsoft/CmdPal-Extensions`](https://github.com/microsoft/CmdPal-Extensions));
+don't duplicate it here — it drifts.
+
+### Required + optional entry fields
+
+| Field | Required | Notes |
+| --- | --- | --- |
+| `id` | yes | Lowercase stable identifier; entries with empty id are dropped. |
+| `title` | yes | Display name. |
+| `description` | yes | Shown in list and detail views. |
+| `author.name` | yes | `author.url` optional. |
+| `installSources` | yes | At least one entry; see [Install sources](#install-sources). |
+| `homepage`, `iconUrl`, `screenshotUrls`, `tags`, `detection.packageFamilyName` | no | All optional. |
+
+Relative `iconUrl` / `screenshotUrls` are resolved against the feed URL's
+directory (useful only for local / `file://` feeds during development).
+
+## Install sources
+
+Each entry's `installSources` is consumed by
+`ExtensionGalleryItemViewModel` to decide which install affordances to show.
+
+| `type` | Required field | Behaviour |
+| --- | --- | --- |
+| `winget` | `id` | Enables the "Install via WinGet" button (uses the shared WinGet service), and joins in-flight install progress + installed/update status. |
+| `msstore` | `id` | Opens `ms-windows-store://pdp/?ProductId={id}`. |
+| `url` | `uri` | Shown as a "GitHub" or "Website" link depending on host. |
+
+An entry can declare any combination. Sources the runtime does not recognise
+are surfaced as an "unknown source" indicator.
+
+## Fetching and caching
+
+`ExtensionGalleryService` uses `ExtensionGalleryHttpClient`, which wraps
+`HttpCachingClient` over a file-system cache. Both the feed JSON and any
+cacheable icon URLs are cached.
+
+| Setting | Value | Defined in |
+| --- | --- | --- |
+| Cache root | `{AppCache}\GalleryCache\` | `ExtensionGalleryHttpClient.CacheDirectoryName` |
+| Feed TTL | 4 hours | `ExtensionGalleryHttpClient.DefaultTimeToLive` |
+| Icon TTL | 24 hours | `ExtensionGalleryService.IconCacheTtl` |
+| HTTP timeout | 15 s | `ExtensionGalleryHttpClient` |
+| `User-Agent` | `PowerToys-CmdPal/1.0` | `ExtensionGalleryHttpClient` |
+
+`{AppCache}` resolves to `ApplicationData.Current.LocalCacheFolder` when
+CmdPal runs packaged, and to
+`%LOCALAPPDATA%\Microsoft\PowerToys\Microsoft.CmdPal\Cache\` when unpackaged
+(see `ApplicationInfoService.DetermineCacheDirectory`).
+
+### Fetch flow
+
+`GetExtensionsAsync` (normal load) and `RefreshAsync` (user-initiated
+refresh, `forceRefresh: true`) both go through `FetchWrappedFeedAsync`:
+
+1. Resolve the feed URL (see above).
+2. If the URL is local, read it from disk. Otherwise, hand it to
+   `HttpCachingClient.GetResourceAsync` which:
+   - Serves a fresh cached copy if one exists and TTL has not elapsed.
+   - Otherwise issues a conditional GET (ETag / `If-None-Match`). On `304
+     Not Modified` it refreshes the cache metadata and returns the cached
+     body.
+   - On network failure it returns the last-known cached body with
+     `UsedFallbackCache = true`, so the UI can show a "stale data" banner.
+3. Parse the JSON with the source-generated `GallerySerializationContext`
+   (strongly-typed `GalleryRemoteIndex` — no reflection, AOT-friendly).
+4. Drop entries with missing `id`, normalize relative `iconUrl` and
+   `screenshotUrls`, and resolve remote icon URIs through the same HTTP
+   cache so the UI binds to local `file://` URIs.
+5. On a successful forced refresh, `PruneCachedResources` deletes cache
+   entries that are no longer referenced by the current feed (old feed URL
+   and icon URLs that dropped out of the feed).
+
+### Fetch result flags
+
+`GetExtensionsAsync` returns a `GalleryFetchResult` that the view model uses
+for UI hints:
+
+| Flag | Meaning |
+| --- | --- |
+| `FromCache` | The feed came from cache without hitting the network (TTL still valid). |
+| `UsedFallbackCache` | A network request was attempted and failed, and the cached copy was served as fallback. The UI shows a stale-data info bar. |
+| `RateLimited` | The origin returned `429 Too Many Requests` and no fallback was available. The UI shows a rate-limit error. |
+
+## Authoring
+
+- Entries for the production gallery are added to the feed repo
+  `microsoft/CmdPal-Extensions`.
+- For editor validation of an entry, reference the schema published in the
+  upstream repo via the entry's `$schema` field.
+- Keep `id` stable once an extension is published — users may have it
+  installed and the gallery keys install status by id.
+- Prefer providing a `winget` source when the extension ships through App
+  Installer; the gallery uses it both for status ("Installed" / "Update
+  available") and for the in-app install button.
+- `detection.packageFamilyName` lets the gallery recognise an
+  already-installed packaged extension before WinGet metadata resolves.
+
@@ -0,0 +1,12 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+namespace Microsoft.CmdPal.Common.ExtensionGallery.Models;
+
+public sealed class GalleryAuthor
+{
+    public string Name { get; set; } = string.Empty;
+
+    public string? Url { get; set; }
+}
@@ -0,0 +1,10 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+namespace Microsoft.CmdPal.Common.ExtensionGallery.Models;
+
+public sealed class GalleryDetection
+{
+    public string? PackageFamilyName { get; set; }
+}
@@ -0,0 +1,32 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+namespace Microsoft.CmdPal.Common.ExtensionGallery.Models;
+
+public sealed class GalleryExtensionEntry
+{
+    public string Id { get; set; } = string.Empty;
+
+    public string Title { get; set; } = string.Empty;
+
+    public string Description { get; set; } = string.Empty;
+
+    public string? ShortDescription { get; set; }
+
+    public GalleryAuthor Author { get; set; } = new();
+
+    public string? Homepage { get; set; }
+
+    public string? Readme { get; set; }
+
+    public string? IconUrl { get; set; }
+
+    public List<string> ScreenshotUrls { get; set; } = [];
+
+    public List<GalleryInstallSource> InstallSources { get; set; } = [];
+
+    public GalleryDetection? Detection { get; set; }
+
+    public List<string> Tags { get; set; } = [];
+}
@@ -0,0 +1,14 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+namespace Microsoft.CmdPal.Common.ExtensionGallery.Models;
+
+public sealed class GalleryInstallSource
+{
+    public string Type { get; set; } = string.Empty;
+
+    public string? Id { get; set; }
+
+    public string? Uri { get; set; }
+}
@@ -0,0 +1,13 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+namespace Microsoft.CmdPal.Common.ExtensionGallery.Models;
+
+/// <summary>
+/// Represents the wrapped gallery index format where extension data is inline.
+/// </summary>
+public sealed class GalleryRemoteIndex
+{
+    public List<GalleryExtensionEntry> Extensions { get; set; } = [];
+}
@@ -0,0 +1,14 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.Text.Json.Serialization;
+
+namespace Microsoft.CmdPal.Common.ExtensionGallery.Models;
+
+[JsonSerializable(typeof(GalleryExtensionEntry))]
+[JsonSerializable(typeof(GalleryRemoteIndex))]
+[JsonSourceGenerationOptions(PropertyNameCaseInsensitive = true)]
+public sealed partial class GallerySerializationContext : JsonSerializerContext
+{
+}