diff --git a/.github/workflows/deploy-pages.yml b/.github/workflows/deploy-pages.yml
index b6910e3..065f50d 100644
--- a/.github/workflows/deploy-pages.yml
+++ b/.github/workflows/deploy-pages.yml
@@ -6,6 +6,8 @@ on:
       - main
     paths:
       - src/**
+      - tests/**
+      - 'tools/coverage-badge.php'
       - 'phpdoc.xml'
       - 'bin/generate-docs.sh'
       - 'tools/docs-check.php'
@@ -36,14 +38,22 @@ jobs:
         with:
           php-version: '8.3'
           extensions: dom, mbstring
-          coverage: none
+          coverage: xdebug
 
       - name: Install dependencies
         run: composer install --no-interaction --no-progress --prefer-dist --ignore-platform-reqs
 
+      - name: Run coverage for badge
+        env:
+          XDEBUG_MODE: coverage
+        run: composer test:coverage
+
       - name: Build API documentation
         run: composer docs
 
+      - name: Coverage badge endpoint
+        run: php tools/coverage-badge.php var/coverage/clover.xml docs/coverage.json
+
       - name: Setup Pages
         uses: actions/configure-pages@v5
 
diff --git a/tools/coverage-badge.php b/tools/coverage-badge.php
new file mode 100644
index 0000000..cb40fdd
--- /dev/null
+++ b/tools/coverage-badge.php
@@ -0,0 +1,61 @@
+#!/usr/bin/env php
+<?php
+
+declare(strict_types=1);
+
+/**
+ * Генерирует shields.io-endpoint JSON с фактическим покрытием строк
+ * из clover-отчёта. Публикуется на GitHub Pages рядом с документацией —
+ * бейдж в README живёт без внешних сервисов и токенов.
+ *
+ * Использование: php tools/coverage-badge.php [clover.xml] [выход.json]
+ */
+
+$cloverPath = $argv[1] ?? 'var/coverage/clover.xml';
+$outputPath = $argv[2] ?? 'docs/coverage.json';
+
+if (!is_file($cloverPath)) {
+    fwrite(STDERR, sprintf('Нет clover-отчёта: %s%s', $cloverPath, PHP_EOL));
+
+    exit(1);
+}
+
+$xml = simplexml_load_file($cloverPath);
+
+if ($xml === false || $xml->project->metrics === null) {
+    fwrite(STDERR, 'Не удалось разобрать clover.xml.' . PHP_EOL);
+
+    exit(1);
+}
+
+$metrics = $xml->project->metrics;
+$statements = (int)$metrics['statements'];
+$covered = (int)$metrics['coveredstatements'];
+
+if ($statements === 0) {
+    fwrite(STDERR, 'В отчёте нет исполняемых строк.' . PHP_EOL);
+
+    exit(1);
+}
+
+$percent = round($covered / $statements * 100, 2);
+$color = $percent >= 98.0 ? 'brightgreen' : ($percent >= 90.0 ? 'yellow' : 'red');
+
+$badge = [
+    'schemaVersion' => 1,
+    'label' => 'coverage',
+    'message' => rtrim(rtrim(number_format($percent, 2, '.', ''), '0'), '.') . '%',
+    'color' => $color,
+];
+
+$dir = \dirname($outputPath);
+
+if (!is_dir($dir) && !mkdir($dir, 0775, true) && !is_dir($dir)) {
+    fwrite(STDERR, sprintf('Не удалось создать каталог %s%s', $dir, PHP_EOL));
+
+    exit(1);
+}
+
+file_put_contents($outputPath, json_encode($badge, JSON_THROW_ON_ERROR) . PHP_EOL);
+printf("Бейдж покрытия: %s → %s%s", $badge['message'], $outputPath, PHP_EOL);
+exit(0);