diff --git a/src/Admin/AdminNotice.php b/src/Admin/AdminNotice.php
new file mode 100644
index 0000000..b6cd502
--- /dev/null
+++ b/src/Admin/AdminNotice.php
@@ -0,0 +1,28 @@
+<?php
+/**
+ * Admin notice value object.
+ *
+ * @package WPContentSync
+ */
+
+namespace WPContentSync\Admin;
+
+final class AdminNotice {
+	private const TYPES = array( 'success', 'warning', 'error', 'info' );
+
+	private string $type;
+	private string $message;
+
+	public function __construct( string $type, string $message ) {
+		$this->type    = in_array( $type, self::TYPES, true ) ? $type : 'info';
+		$this->message = sanitize_text_field( $message );
+	}
+
+	public function type(): string {
+		return $this->type;
+	}
+
+	public function message(): string {
+		return $this->message;
+	}
+}
diff --git a/src/Admin/AdminNoticeRepository.php b/src/Admin/AdminNoticeRepository.php
new file mode 100644
index 0000000..8e38708
--- /dev/null
+++ b/src/Admin/AdminNoticeRepository.php
@@ -0,0 +1,59 @@
+<?php
+/**
+ * Builds admin notices from redirect query args.
+ *
+ * @package WPContentSync
+ */
+
+namespace WPContentSync\Admin;
+
+final class AdminNoticeRepository {
+	/**
+	 * @return array<int, AdminNotice>
+	 */
+	public function current(): array {
+		$notices = array();
+
+		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Reads redirect-only admin notice query args.
+		if ( isset( $_GET['wpcs_imported'] ) ) {
+			$notices[] = new AdminNotice( 'success', __( 'The package JSON file was imported successfully.', 'wp-content-sync' ) );
+		}
+
+		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Reads redirect-only admin notice query args.
+		if ( isset( $_GET['wpcs_import_error'] ) ) {
+			$notices[] = new AdminNotice( 'error', $this->queryValue( 'wpcs_import_error' ) );
+		}
+
+		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Reads redirect-only admin notice query args.
+		if ( isset( $_GET['wpcs_settings_saved'] ) ) {
+			$notices[] = new AdminNotice( 'success', __( 'Settings saved.', 'wp-content-sync' ) );
+		}
+
+		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Reads redirect-only admin notice query args.
+		if ( isset( $_GET['wpcs_connection_ok'] ) ) {
+			$notices[] = new AdminNotice( 'success', __( 'REST connection succeeded.', 'wp-content-sync' ) );
+		}
+
+		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Reads redirect-only admin notice query args.
+		if ( isset( $_GET['wpcs_logs_cleared'] ) ) {
+			$notices[] = new AdminNotice( 'success', __( 'Logs cleared.', 'wp-content-sync' ) );
+		}
+
+		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Reads redirect-only admin notice query args.
+		if ( isset( $_GET['wpcs_connection_error'] ) ) {
+			$notices[] = new AdminNotice( 'error', $this->queryValue( 'wpcs_connection_error' ) );
+		}
+
+		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Reads redirect-only admin notice query args.
+		if ( isset( $_GET['wpcs_export_error'] ) ) {
+			$notices[] = new AdminNotice( 'error', $this->queryValue( 'wpcs_export_error' ) );
+		}
+
+		return $notices;
+	}
+
+	private function queryValue( string $key ): string {
+		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Reads redirect-only admin notice query args.
+		return sanitize_text_field( wp_unslash( $_GET[ $key ] ?? '' ) );
+	}
+}
diff --git a/tests/Unit/Admin/AdminNoticeRepositoryTest.php b/tests/Unit/Admin/AdminNoticeRepositoryTest.php
new file mode 100644
index 0000000..1b428b8
--- /dev/null
+++ b/tests/Unit/Admin/AdminNoticeRepositoryTest.php
@@ -0,0 +1,51 @@
+<?php
+/**
+ * Tests for redirect-driven admin notices.
+ *
+ * @package WPContentSync
+ */
+
+namespace WPContentSync\Tests\Unit\Admin;
+
+use PHPUnit\Framework\TestCase;
+use WPContentSync\Admin\AdminNoticeRepository;
+
+class AdminNoticeRepositoryTest extends TestCase {
+	protected function tearDown(): void {
+		$_GET = array();
+
+		parent::tearDown();
+	}
+
+	public function test_it_builds_import_success_notices(): void {
+		$_GET['wpcs_imported'] = '1';
+		$notices               = ( new AdminNoticeRepository() )->current();
+
+		self::assertSame( 'success', $notices[0]->type() );
+		self::assertSame( 'The package JSON file was imported successfully.', $notices[0]->message() );
+	}
+
+	public function test_it_sanitizes_error_notices(): void {
+		$_GET['wpcs_import_error'] = '<script>Bad package</script>';
+		$notices                   = ( new AdminNoticeRepository() )->current();
+
+		self::assertSame( 'error', $notices[0]->type() );
+		self::assertSame( 'Bad package', $notices[0]->message() );
+	}
+
+	public function test_it_builds_settings_connection_logs_and_export_notices(): void {
+		$_GET['wpcs_settings_saved']   = '1';
+		$_GET['wpcs_connection_ok']    = '1';
+		$_GET['wpcs_logs_cleared']     = '1';
+		$_GET['wpcs_connection_error'] = 'REST authentication failed.';
+		$_GET['wpcs_export_error']     = 'Export failed.';
+
+		$notices = ( new AdminNoticeRepository() )->current();
+
+		self::assertSame( 'Settings saved.', $notices[0]->message() );
+		self::assertSame( 'REST connection succeeded.', $notices[1]->message() );
+		self::assertSame( 'Logs cleared.', $notices[2]->message() );
+		self::assertSame( 'REST authentication failed.', $notices[3]->message() );
+		self::assertSame( 'Export failed.', $notices[4]->message() );
+	}
+}