diff --git a/app/Http/Resources/UserResource.php b/app/Http/Resources/UserResource.php
index 312984023..9559528ed 100644
--- a/app/Http/Resources/UserResource.php
+++ b/app/Http/Resources/UserResource.php
@@ -37,6 +37,7 @@ public function toArray(Request $request): array
             'commits_count' => $this->whenCounted('commits'),
             'followers_count' => $this->whenCounted('followers'),
             'following_count' => $this->whenCounted('following'),
+            'contributor' => $this->isRepositoryContributor(),
             'lane' => $this->when($request->user() instanceof User, fn (): int|string => $this->lane()),
             'is_followed' => $this->whenHas('is_followed'),
             'follows_you' => $this->whenHas('follows_you'),
diff --git a/app/Models/User.php b/app/Models/User.php
index 085bb8f76..0a431d80c 100644
--- a/app/Models/User.php
+++ b/app/Models/User.php
@@ -10,6 +10,7 @@
 use App\Enums\LivePlatform;
 use App\Enums\Log;
 use App\Enums\RemotesFrom;
+use App\Queries\RepositoryContributorsQuery;
 use Carbon\CarbonInterface;
 use Database\Factories\UserFactory;
 use Illuminate\Database\Eloquent\Attributes\Hidden;
@@ -534,6 +535,14 @@ public function automaticLane(): int
         return $hash % 6;
     }
 
+    /**
+     * Whether this GitHub username has commits on the /dev/null repository.
+     */
+    public function isRepositoryContributor(): bool
+    {
+        return resolve(RepositoryContributorsQuery::class)->contains($this->username);
+    }
+
     /**
      * @return array<mixed>
      */
@@ -543,6 +552,7 @@ public function toArray(): array
             ...parent::toArray(),
             'lane' => $this->lane(),
             'has_github_account' => $this->hasGitHubAccount(),
+            'contributor' => $this->isRepositoryContributor(),
             'live' => $this->liveStream()?->toArray(),
         ];
     }
diff --git a/app/Queries/RepositoryContributorsQuery.php b/app/Queries/RepositoryContributorsQuery.php
new file mode 100644
index 000000000..dc5e9b9b0
--- /dev/null
+++ b/app/Queries/RepositoryContributorsQuery.php
@@ -0,0 +1,98 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Queries;
+
+use App\Services\GitHub;
+use Illuminate\Http\Client\HttpClientException;
+use Illuminate\Support\Facades\Cache;
+use Illuminate\Support\Fluent;
+use RuntimeException;
+use Throwable;
+
+/**
+ * GitHub accounts that have commits on the repository's default branch. Cached; soft-fails to nobody when GitHub is down.
+ */
+final readonly class RepositoryContributorsQuery
+{
+    private const string CacheKey = 'repository-contributors:usernames';
+
+    private const int CacheSeconds = 900;
+
+    private const int MaxPages = 5;
+
+    public function __construct(private GitHub $github)
+    {
+        //
+    }
+
+    public function contains(string $username): bool
+    {
+        return in_array(mb_strtolower($username), $this->usernames(), true);
+    }
+
+    /**
+     * @return list<string>
+     */
+    public function usernames(): array
+    {
+        return once(function (): array {
+            try {
+                /** @var list<string>|null $cached */
+                $cached = Cache::get(self::CacheKey);
+
+                if (is_array($cached)) {
+                    return $cached;
+                }
+            } catch (Throwable) {
+                //
+            }
+
+            try {
+                $usernames = $this->fetch();
+
+                try {
+                    Cache::put(self::CacheKey, $usernames, self::CacheSeconds);
+                } catch (Throwable) {
+                    //
+                }
+
+                return $usernames;
+            } catch (HttpClientException|RuntimeException) {
+                return [];
+            }
+        });
+    }
+
+    /**
+     * @return list<string>
+     */
+    private function fetch(): array
+    {
+        $usernames = [];
+
+        $repository = config()->string('services.github.repository');
+
+        for ($page = 1; $page <= self::MaxPages; $page++) {
+            $contributors = $this->github->request()->get('repos/'.$repository.'/contributors', [
+                'per_page' => 100,
+                'page' => $page,
+            ])->throw()->collect();
+
+            foreach ($contributors->where('type', 'User')->mapInto(Fluent::class) as $contributor) {
+                $login = mb_strtolower($contributor->string('login')->value());
+
+                if ($login !== '') {
+                    $usernames[] = $login;
+                }
+            }
+
+            if ($contributors->count() < 100) {
+                break;
+            }
+        }
+
+        return array_values(array_unique($usernames));
+    }
+}
diff --git a/resources/js/components/app-aside.tsx b/resources/js/components/app-aside.tsx
index ef8080a4b..deb8c4207 100644
--- a/resources/js/components/app-aside.tsx
+++ b/resources/js/components/app-aside.tsx
@@ -7,6 +7,7 @@ import TermsController from '@/actions/App/Http/Controllers/TermsController';
 import UserFollowersController from '@/actions/App/Http/Controllers/UserFollowersController';
 import UserFollowingController from '@/actions/App/Http/Controllers/UserFollowingController';
 import { BioText } from '@/components/bio-text';
+import { ContributorBadge } from '@/components/contributor-badge';
 import { GitHubIcon } from '@/components/github-icon';
 import { LiveFollowing } from '@/components/live-following';
 import { Button } from '@/components/ui/button';
@@ -97,8 +98,11 @@ export function AppAside({
                     >
                         <UserAvatar user={user} className="size-12" />
                         <span className="min-w-0">
-                            <span className="block truncate font-semibold group-hover:underline">
-                                {user.name}
+                            <span className="flex min-w-0 items-center gap-1.5">
+                                <span className="truncate font-semibold group-hover:underline">
+                                    {user.name}
+                                </span>
+                                {user.contributor && <ContributorBadge />}
                             </span>
                             <span className="flex items-center gap-1.5 font-mono text-sm text-muted-foreground">
                                 <span
diff --git a/resources/js/components/commit-card.tsx b/resources/js/components/commit-card.tsx
index c507e6155..207a1628c 100644
--- a/resources/js/components/commit-card.tsx
+++ b/resources/js/components/commit-card.tsx
@@ -19,6 +19,7 @@ import {
     useThread,
 } from '@/components/commit-thread';
 import { useCommitTranslation } from '@/components/commit-translation';
+import { ContributorBadge } from '@/components/contributor-badge';
 import {
     GraphDimmed,
     GraphScope,
@@ -344,6 +345,9 @@ export function CommitCard({
                                     >
                                         {commit.user.name}
                                     </Link>
+                                    {commit.user.contributor && (
+                                        <ContributorBadge />
+                                    )}
                                     <Link
                                         href={show(commit.user)}
                                         tabIndex={-1}
diff --git a/resources/js/components/commit-thread.tsx b/resources/js/components/commit-thread.tsx
index 22cdfedbd..9365ae810 100644
--- a/resources/js/components/commit-thread.tsx
+++ b/resources/js/components/commit-thread.tsx
@@ -39,6 +39,7 @@ import {
     PreviewToggle,
     useComposerPreview,
 } from '@/components/composer-preview';
+import { ContributorBadge } from '@/components/contributor-badge';
 import {
     useGraphDimmed,
     useGraphNode,
@@ -1174,6 +1175,7 @@ function CommitReply({
                             >
                                 {reply.user.name}
                             </Link>
+                            {reply.user.contributor && <ContributorBadge />}
                             <Link
                                 href={show(reply.user)}
                                 tabIndex={-1}
diff --git a/resources/js/components/contributor-badge.tsx b/resources/js/components/contributor-badge.tsx
new file mode 100644
index 000000000..108ded9c0
--- /dev/null
+++ b/resources/js/components/contributor-badge.tsx
@@ -0,0 +1,30 @@
+import AppLogoIcon from '@/components/app-logo-icon';
+import {
+    Tooltip,
+    TooltipContent,
+    TooltipTrigger,
+} from '@/components/ui/tooltip';
+import { cn } from '@/lib/utils';
+
+export function ContributorBadge({ className }: { className?: string }) {
+    return (
+        <Tooltip>
+            <TooltipTrigger asChild>
+                <span
+                    className={cn(
+                        'inline-flex shrink-0 items-center self-center text-foreground',
+                        className,
+                    )}
+                    data-test="contributor-badge"
+                >
+                    <AppLogoIcon
+                        aria-hidden
+                        className="size-3.5 fill-current"
+                    />
+                    <span className="sr-only">Contributor</span>
+                </span>
+            </TooltipTrigger>
+            <TooltipContent>Contributor</TooltipContent>
+        </Tooltip>
+    );
+}
diff --git a/resources/js/components/quoted-commit.tsx b/resources/js/components/quoted-commit.tsx
index 8c7e090da..aff30f9de 100644
--- a/resources/js/components/quoted-commit.tsx
+++ b/resources/js/components/quoted-commit.tsx
@@ -5,6 +5,7 @@ import { CommitBodyExcerpt } from '@/components/commit-body';
 import { CommitImages } from '@/components/commit-images';
 import { CommitPoll } from '@/components/commit-poll';
 import { CommitStatusBadge } from '@/components/commit-status-badge';
+import { ContributorBadge } from '@/components/contributor-badge';
 import { LinkPreview } from '@/components/link-preview';
 import { UserAvatar } from '@/components/user-avatar';
 import { useNow } from '@/hooks/use-now';
@@ -50,6 +51,7 @@ export function QuotedCommit({
                 <span className="truncate font-semibold">
                     {commit.user.name}
                 </span>
+                {commit.user.contributor && <ContributorBadge />}
                 <span className="truncate font-mono text-xs text-muted-foreground">
                     @{commit.user.username}
                 </span>
diff --git a/resources/js/components/user-preview.tsx b/resources/js/components/user-preview.tsx
index c24f9da0b..e29f8a7e1 100644
--- a/resources/js/components/user-preview.tsx
+++ b/resources/js/components/user-preview.tsx
@@ -6,6 +6,7 @@ import UserFollowController from '@/actions/App/Http/Controllers/UserFollowContr
 import UserFollowersController from '@/actions/App/Http/Controllers/UserFollowersController';
 import UserFollowingController from '@/actions/App/Http/Controllers/UserFollowingController';
 import { BioText } from '@/components/bio-text';
+import { ContributorBadge } from '@/components/contributor-badge';
 import {
     FollowLabel,
     followVisitOptions,
@@ -453,9 +454,10 @@ function UserPreviewContent({
 
             <Link
                 href={show(user)}
-                className="mt-3 block truncate font-semibold hover:underline"
+                className="mt-3 flex min-w-0 items-center gap-1.5 font-semibold hover:underline"
             >
-                {user.name}
+                <span className="truncate">{user.name}</span>
+                {user.contributor && <ContributorBadge />}
             </Link>
             <p className="flex items-center gap-1.5 font-mono text-[13px] text-muted-foreground">
                 <span
diff --git a/resources/js/components/who-to-follow.tsx b/resources/js/components/who-to-follow.tsx
index 40055c223..24a5e6838 100644
--- a/resources/js/components/who-to-follow.tsx
+++ b/resources/js/components/who-to-follow.tsx
@@ -2,6 +2,7 @@ import { Deferred, Link, router, usePage } from '@inertiajs/react';
 import { Ellipsis, EyeOff, RefreshCw, X } from 'lucide-react';
 import { useRef, useState } from 'react';
 import SuggestionDismissalController from '@/actions/App/Http/Controllers/SuggestionDismissalController';
+import { ContributorBadge } from '@/components/contributor-badge';
 import {
     FollowButton,
     FollowIconButton,
@@ -180,8 +181,11 @@ export function SuggestedUserRow({
                                 <UserAvatar user={user} className="size-9" />
                             </span>
                             <span className="min-w-0">
-                                <span className="block truncate text-sm font-semibold group-hover:underline">
-                                    {user.name}
+                                <span className="flex min-w-0 items-center gap-1">
+                                    <span className="truncate text-sm font-semibold group-hover:underline">
+                                        {user.name}
+                                    </span>
+                                    {user.contributor && <ContributorBadge />}
                                 </span>
                                 <span className="flex min-w-0 items-center gap-1.5 font-mono text-xs text-muted-foreground">
                                     <span
diff --git a/resources/js/pages/user/show.tsx b/resources/js/pages/user/show.tsx
index 7416d8021..c73f9cc54 100644
--- a/resources/js/pages/user/show.tsx
+++ b/resources/js/pages/user/show.tsx
@@ -19,6 +19,7 @@ import { ActivityGraph } from '@/components/activity-graph';
 import { ActivityStreaks } from '@/components/activity-streaks';
 import { BioText } from '@/components/bio-text';
 import { CommitFeed, EmptyFeed } from '@/components/commit-feed';
+import { ContributorBadge } from '@/components/contributor-badge';
 import { EditProfileMenu } from '@/components/edit-profile-menu';
 import { FollowButton } from '@/components/follow-button';
 import { GitHubIcon } from '@/components/github-icon';
@@ -116,7 +117,10 @@ export default function Show({
             <Head title={`${user.name} (@${user.username})`} />
 
             <div className="sticky top-0 z-10 flex h-14 items-center gap-3 border-b bg-card px-4 sm:px-6">
-                <p className="min-w-0 truncate font-semibold">{user.name}</p>
+                <p className="flex min-w-0 items-center gap-1.5 font-semibold">
+                    <span className="truncate">{user.name}</span>
+                    {user.contributor && <ContributorBadge />}
+                </p>
                 <p
                     className="shrink-0 font-mono text-[13px] text-muted-foreground"
                     title={exactCountTitle(user.commits_count)}
@@ -215,8 +219,9 @@ export default function Show({
                     </div>
                 </div>
 
-                <h1 className="mt-4 text-2xl font-semibold tracking-tight text-balance">
-                    {user.name}
+                <h1 className="mt-4 flex items-center gap-2 text-2xl font-semibold tracking-tight text-balance">
+                    <span className="min-w-0 truncate">{user.name}</span>
+                    {user.contributor && <ContributorBadge />}
                 </h1>
                 <div className="flex items-center gap-2">
                     <p className="flex items-center gap-1.5 font-mono text-sm text-muted-foreground">
diff --git a/resources/js/types/auth.ts b/resources/js/types/auth.ts
index 4b12c76df..9f05a72e0 100644
--- a/resources/js/types/auth.ts
+++ b/resources/js/types/auth.ts
@@ -22,6 +22,10 @@ export type User = {
     company: string | null;
     has_sponsors_listing: boolean;
     has_github_account: boolean;
+    /**
+     * Whether this person has commits on the /dev/null GitHub repository.
+     */
+    contributor: boolean;
     lane: Lane;
     timezone: string | null;
     show_local_time: boolean;
diff --git a/tests/Feature/Controllers/Api/CommitControllerTest.php b/tests/Feature/Controllers/Api/CommitControllerTest.php
index 7c3e614ce..e9abd41d2 100644
--- a/tests/Feature/Controllers/Api/CommitControllerTest.php
+++ b/tests/Feature/Controllers/Api/CommitControllerTest.php
@@ -56,6 +56,7 @@
                 'html_url' => route('user.show', $user),
                 'feed_url' => route('user-feed.show', $user),
                 'created_at' => now()->toIso8601ZuluString(),
+                'contributor' => false,
             ],
         ]]);
 });
@@ -231,6 +232,7 @@
         'html_url' => route('user.show', $author),
         'feed_url' => route('user-feed.show', $author),
         'created_at' => now()->toIso8601ZuluString(),
+        'contributor' => false,
         'lane' => $author->lane(),
     ];
 
diff --git a/tests/Feature/Controllers/Api/CurrentUserControllerTest.php b/tests/Feature/Controllers/Api/CurrentUserControllerTest.php
index d0a47dc28..8e9fc290d 100644
--- a/tests/Feature/Controllers/Api/CurrentUserControllerTest.php
+++ b/tests/Feature/Controllers/Api/CurrentUserControllerTest.php
@@ -51,6 +51,7 @@
                 'commits_count' => 1,
                 'followers_count' => 3,
                 'following_count' => 2,
+                'contributor' => false,
                 'lane' => $user->lane(),
                 'pasteis_mode' => true,
                 'pasteis_remaining' => 7,
diff --git a/tests/Feature/Controllers/Api/LogControllerTest.php b/tests/Feature/Controllers/Api/LogControllerTest.php
index b02115f83..dcdebde96 100644
--- a/tests/Feature/Controllers/Api/LogControllerTest.php
+++ b/tests/Feature/Controllers/Api/LogControllerTest.php
@@ -70,6 +70,7 @@
             'html_url' => route('user.show', $author),
             'feed_url' => route('user-feed.show', $author),
             'created_at' => now()->toIso8601ZuluString(),
+            'contributor' => false,
             'lane' => $author->lane(),
         ],
         'body_segments' => [['type' => 'text', 'text' => 'It was DNS.']],
diff --git a/tests/Feature/Controllers/Api/NotificationControllerTest.php b/tests/Feature/Controllers/Api/NotificationControllerTest.php
index f1b015867..eca38b168 100644
--- a/tests/Feature/Controllers/Api/NotificationControllerTest.php
+++ b/tests/Feature/Controllers/Api/NotificationControllerTest.php
@@ -38,6 +38,7 @@
         'html_url' => route('user.show', $user),
         'feed_url' => route('user-feed.show', $user),
         'created_at' => now()->toIso8601ZuluString(),
+        'contributor' => false,
         'lane' => $user->lane(),
     ];
 
diff --git a/tests/Feature/Controllers/Api/UserControllerTest.php b/tests/Feature/Controllers/Api/UserControllerTest.php
index 5212ea033..ebc4aba35 100644
--- a/tests/Feature/Controllers/Api/UserControllerTest.php
+++ b/tests/Feature/Controllers/Api/UserControllerTest.php
@@ -46,6 +46,7 @@
             'commits_count' => 2,
             'followers_count' => 3,
             'following_count' => 1,
+            'contributor' => false,
         ]]);
 });
 
@@ -115,6 +116,7 @@
                 'commits_count' => 3,
                 'followers_count' => 1,
                 'following_count' => 2,
+                'contributor' => false,
                 'lane' => $user->lane(),
             ],
             'is_following' => true,
diff --git a/tests/Feature/Controllers/LogControllerTest.php b/tests/Feature/Controllers/LogControllerTest.php
index 6b37481af..57cd660db 100644
--- a/tests/Feature/Controllers/LogControllerTest.php
+++ b/tests/Feature/Controllers/LogControllerTest.php
@@ -14,6 +14,7 @@
 use App\Services\Features;
 use Illuminate\Database\Eloquent\Factories\Sequence;
 use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Facades\Http;
 use Illuminate\Support\Facades\Queue;
 use Illuminate\Support\Str;
 
@@ -44,6 +45,28 @@
             ->where('commits.data.1.body', 'Mine'));
 });
 
+it('marks repository contributors on commit authors', function (): void {
+    Http::fake(['api.github.com/repos/nunomaduro/dev-null.sh/contributors*' => Http::response([
+        ['type' => 'User', 'login' => 'octocat', 'contributions' => 3],
+    ])]);
+
+    $viewer = User::factory()->create();
+    $contributor = User::factory()->create(['username' => 'octocat']);
+    $other = User::factory()->create(['username' => 'stranger']);
+
+    Commit::factory()->for($contributor)->create(['created_at' => now()->subMinute()]);
+    Commit::factory()->for($other)->create();
+
+    $this->actingAs($viewer)
+        ->get('/log/latest')
+        ->assertOk()
+        ->assertInertia(fn ($page) => $page
+            ->where('commits.data.0.user.username', 'stranger')
+            ->where('commits.data.0.user.contributor', false)
+            ->where('commits.data.1.user.username', 'octocat')
+            ->where('commits.data.1.user.contributor', true));
+});
+
 it('renders each author with their effective lane', function (): void {
     $user = User::factory()->create();
     $chosen = User::factory()->create(['preferred_lane' => 5]);
diff --git a/tests/Unit/CommitImages.test.tsx b/tests/Unit/CommitImages.test.tsx
index f2a91b252..1532d8d40 100644
--- a/tests/Unit/CommitImages.test.tsx
+++ b/tests/Unit/CommitImages.test.tsx
@@ -37,6 +37,7 @@ const commit: Commit = {
         company: null,
         has_sponsors_listing: false,
         has_github_account: true,
+        contributor: false,
         lane: 0,
         created_at: '2026-10-16T10:00:00Z',
         updated_at: '2026-10-16T10:00:00Z',
diff --git a/tests/Unit/ContributorBadge.test.tsx b/tests/Unit/ContributorBadge.test.tsx
new file mode 100644
index 000000000..be45b4e15
--- /dev/null
+++ b/tests/Unit/ContributorBadge.test.tsx
@@ -0,0 +1,19 @@
+/// <reference types="node" />
+
+import assert from 'node:assert/strict';
+import { test } from 'node:test';
+import { renderToStaticMarkup } from 'react-dom/server';
+import { ContributorBadge } from '../../resources/js/components/contributor-badge';
+import { TooltipProvider } from '../../resources/js/components/ui/tooltip';
+
+void test('renders the repository mark with a contributor label', () => {
+    const html = renderToStaticMarkup(
+        <TooltipProvider>
+            <ContributorBadge />
+        </TooltipProvider>,
+    );
+
+    assert.match(html, /data-test="contributor-badge"/);
+    assert.match(html, /Contributor/);
+    assert.match(html, /<svg/);
+});
diff --git a/tests/Unit/Models/UserTest.php b/tests/Unit/Models/UserTest.php
index ade45090a..e7ec22d19 100644
--- a/tests/Unit/Models/UserTest.php
+++ b/tests/Unit/Models/UserTest.php
@@ -7,6 +7,7 @@
 use App\Models\SshKey;
 use App\Models\User;
 use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Facades\Http;
 
 test('to array', function (): void {
     $user = User::factory()->create()->refresh();
@@ -28,6 +29,7 @@
             'show_local_time',
             'lane',
             'has_github_account',
+            'contributor',
             'live',
         ]);
 });
@@ -211,6 +213,18 @@
     'custom' => [null, '#1a2b3c', '#1a2b3c'],
 ]);
 
+it('serializes whether it contributed to the repository', function (): void {
+    Http::fake(['api.github.com/repos/nunomaduro/dev-null.sh/contributors*' => Http::response([
+        ['type' => 'User', 'login' => 'octocat', 'contributions' => 1],
+    ])]);
+
+    $contributor = User::factory()->create(['username' => 'octocat']);
+    $other = User::factory()->create(['username' => 'stranger']);
+
+    expect($contributor->toArray()['contributor'])->toBeTrue()
+        ->and($other->toArray()['contributor'])->toBeFalse();
+});
+
 it('knows who it mutes and who mutes it', function (): void {
     $user = User::factory()->create();
     $other = User::factory()->create();
diff --git a/tests/Unit/NotificationInbox.test.tsx b/tests/Unit/NotificationInbox.test.tsx
index 8592334a8..375747f00 100644
--- a/tests/Unit/NotificationInbox.test.tsx
+++ b/tests/Unit/NotificationInbox.test.tsx
@@ -22,6 +22,7 @@ const actor: User = {
     timezone: null,
     show_local_time: false,
     has_github_account: true,
+    contributor: false,
     lane: 0,
     created_at: timestamp,
     updated_at: timestamp,
diff --git a/tests/Unit/Queries/RepositoryContributorsQueryTest.php b/tests/Unit/Queries/RepositoryContributorsQueryTest.php
new file mode 100644
index 000000000..1f889e4d4
--- /dev/null
+++ b/tests/Unit/Queries/RepositoryContributorsQueryTest.php
@@ -0,0 +1,85 @@
+<?php
+
+declare(strict_types=1);
+
+use App\Queries\RepositoryContributorsQuery;
+use Illuminate\Http\Client\Request;
+use Illuminate\Support\Facades\Cache;
+use Illuminate\Support\Facades\Http;
+
+it('lists GitHub user logins and ignores bots', function (): void {
+    Http::fake(['api.github.com/repos/nunomaduro/dev-null.sh/contributors*' => Http::response([
+        ['type' => 'Bot', 'login' => 'dependabot[bot]', 'contributions' => 50],
+        ['type' => 'User', 'login' => 'NunoMaduro', 'contributions' => 10],
+        ['type' => 'User', 'login' => 'xHeaven', 'contributions' => 20],
+    ])]);
+
+    $query = resolve(RepositoryContributorsQuery::class);
+
+    expect($query->usernames())->toBe(['nunomaduro', 'xheaven'])
+        ->and($query->contains('nunomaduro'))->toBeTrue()
+        ->and($query->contains('NunoMaduro'))->toBeTrue()
+        ->and($query->contains('octocat'))->toBeFalse();
+
+    Http::assertSent(fn (Request $request): bool => $request['per_page'] === 100 && $request['page'] === 1);
+});
+
+it('pages through contributors until a short page', function (): void {
+    $page = fn (int $number): array => collect(range(1, 100))->map(fn (int $n): array => [
+        'type' => 'User',
+        'login' => "dev{$number}-{$n}",
+        'contributions' => 1,
+    ])->all();
+
+    Http::fake([
+        'api.github.com/repos/nunomaduro/dev-null.sh/contributors*' => fn (Request $request) => Http::response(match ((int) $request['page']) {
+            1 => $page(1),
+            2 => array_slice($page(2), 0, 3),
+            default => [],
+        }),
+    ]);
+
+    expect(resolve(RepositoryContributorsQuery::class)->usernames())->toHaveCount(103)
+        ->and(resolve(RepositoryContributorsQuery::class)->contains('dev2-3'))->toBeTrue();
+});
+
+it('soft-fails to nobody when GitHub errors without caching the miss', function (): void {
+    Http::fake(['api.github.com/repos/nunomaduro/dev-null.sh/contributors*' => Http::response([], 503)]);
+
+    expect(resolve(RepositoryContributorsQuery::class)->usernames())->toBe([])
+        ->and(Cache::has('repository-contributors:usernames'))->toBeFalse();
+});
+
+it('reads a warm cache without calling GitHub', function (): void {
+    Cache::put('repository-contributors:usernames', ['cached'], 900);
+
+    expect(resolve(RepositoryContributorsQuery::class)->contains('cached'))->toBeTrue();
+
+    Http::assertNothingSent();
+});
+
+it('fetches from GitHub when the cache cannot be read', function (): void {
+    Http::fake(['api.github.com/repos/nunomaduro/dev-null.sh/contributors*' => Http::response([
+        ['type' => 'User', 'login' => 'octocat', 'contributions' => 1],
+    ])]);
+
+    Cache::partialMock()
+        ->shouldReceive('get')
+        ->once()
+        ->andThrow(new RuntimeException('Cache read failed'));
+
+    expect(resolve(RepositoryContributorsQuery::class)->usernames())->toBe(['octocat']);
+});
+
+it('returns usernames when the cache cannot be written', function (): void {
+    Http::fake(['api.github.com/repos/nunomaduro/dev-null.sh/contributors*' => Http::response([
+        ['type' => 'User', 'login' => 'octocat', 'contributions' => 1],
+    ])]);
+
+    Cache::partialMock()
+        ->shouldReceive('put')
+        ->once()
+        ->andThrow(new RuntimeException('Cache write failed'));
+
+    expect(resolve(RepositoryContributorsQuery::class)->usernames())->toBe(['octocat']);
+});