diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6e4bc32..054af4a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -43,3 +43,4 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - refactor: share captured URL-to-path display conversion through `Text::urlToPath()` while retaining original diagnostic URLs and adapter-owned presentation models.
 - feat(events): add the shared execution inspector, stable chronology, grouped filters, bounded optional context and traces, and explicit lifecycle correlation.
 - refactor: centralize exception messages and panel titles in typed enums while preserving diagnostics, labels, and configurable names.
+- refactor: use shared `PanelIcon` enum values for built-in panel SVG keys.
diff --git a/src/Panel/PanelIcon.php b/src/Panel/PanelIcon.php
new file mode 100644
index 0000000..94caa26
--- /dev/null
+++ b/src/Panel/PanelIcon.php
@@ -0,0 +1,88 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PHPForge\Debug\Panel;
+
+/**
+ * Shared SVG keys for built-in debugger panels.
+ *
+ * Use the backed value with string-based toolbar contracts and the shared icon renderer.
+ */
+enum PanelIcon: string
+{
+    /**
+     * Icon key for the Asset Bundles panel.
+     */
+    case ASSETS = 'asset';
+
+    /**
+     * Icon key for the Configuration panel.
+     */
+    case CONFIGURATION = 'config';
+
+    /**
+     * Icon key for the Database panel.
+     */
+    case DATABASE = 'db';
+
+    /**
+     * Icon key for the Dump and fallback JSON panels.
+     */
+    case DUMP = 'dump';
+
+    /**
+     * Icon key for the Events panel.
+     */
+    case EVENTS = 'events';
+
+    /**
+     * Icon key for the Inertia panel.
+     */
+    case INERTIA = 'inertia';
+
+    /**
+     * Icon key for the Logs panel.
+     */
+    case LOGS = 'logs';
+
+    /**
+     * Icon key for the Mail panel.
+     */
+    case MAIL = 'mail';
+
+    /**
+     * Icon key for the Profiling panel.
+     */
+    case PROFILING = 'profiling';
+
+    /**
+     * Icon key for the Queue panel.
+     */
+    case QUEUE = 'queue';
+
+    /**
+     * Icon key for the Request panel.
+     */
+    case REQUEST = 'request';
+
+    /**
+     * Icon key for the Router panel.
+     */
+    case ROUTER = 'router';
+
+    /**
+     * Icon key for the Timeline panel.
+     */
+    case TIMELINE = 'timeline';
+
+    /**
+     * Icon key for the User panel.
+     */
+    case USER = 'user';
+
+    /**
+     * Icon key for the Vite panel.
+     */
+    case VITE = 'brand-javascript';
+}
diff --git a/tests/Panel/PanelIconTest.php b/tests/Panel/PanelIconTest.php
new file mode 100644
index 0000000..8388cbb
--- /dev/null
+++ b/tests/Panel/PanelIconTest.php
@@ -0,0 +1,57 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PHPForge\Debug\Tests\Panel;
+
+use PHPForge\Debug\Helper\Icon;
+use PHPForge\Debug\Panel\PanelIcon;
+use PHPUnit\Framework\TestCase;
+
+use function count;
+
+/**
+ * Verifies stable built-in panel icon keys and their bundled SVG resources.
+ */
+final class PanelIconTest extends TestCase
+{
+    public function testIconKeysPreserveExistingSvgResources(): void
+    {
+        $keys = [
+            'ASSETS' => 'asset',
+            'CONFIGURATION' => 'config',
+            'DATABASE' => 'db',
+            'DUMP' => 'dump',
+            'EVENTS' => 'events',
+            'INERTIA' => 'inertia',
+            'LOGS' => 'logs',
+            'MAIL' => 'mail',
+            'PROFILING' => 'profiling',
+            'QUEUE' => 'queue',
+            'REQUEST' => 'request',
+            'ROUTER' => 'router',
+            'TIMELINE' => 'timeline',
+            'USER' => 'user',
+            'VITE' => 'brand-javascript',
+        ];
+
+        self::assertCount(
+            count($keys),
+            PanelIcon::cases(),
+            'Every built-in icon must have a stable key assertion.',
+        );
+
+        foreach (PanelIcon::cases() as $icon) {
+            self::assertSame(
+                $keys[$icon->name],
+                $icon->value,
+                'Existing panel icon keys must remain unchanged.',
+            );
+            self::assertStringContainsString(
+                '<svg',
+                Icon::render($icon->value),
+                'Every built-in panel icon must resolve to a bundled SVG.',
+            );
+        }
+    }
+}