diff --git a/assets/jsons/Action.json b/assets/jsons/Action.json
new file mode 100644
index 0000000..dc75ce4
--- /dev/null
+++ b/assets/jsons/Action.json
@@ -0,0 +1,150 @@
+{
+    "185": {
+        "cast": 20,
+        "recast": 25
+    },
+    "188": {
+        "cast": 0,
+        "recast": 300
+    },
+    "3540": {
+        "cast": 0,
+        "recast": 900
+    },
+    "3613": {
+        "cast": 0,
+        "recast": 600
+    },
+    "7385": {
+        "cast": 0,
+        "recast": 1200
+    },
+    "7388": {
+        "cast": 0,
+        "recast": 900
+    },
+    "7405": {
+        "cast": 0,
+        "recast": 1200
+    },
+    "7432": {
+        "cast": 0,
+        "recast": 300
+    },
+    "7535": {
+        "cast": 0,
+        "recast": 600
+    },
+    "7549": {
+        "cast": 0,
+        "recast": 900
+    },
+    "7560": {
+        "cast": 0,
+        "recast": 900
+    },
+    "16012": {
+        "cast": 0,
+        "recast": 1200
+    },
+    "16160": {
+        "cast": 0,
+        "recast": 900
+    },
+    "16471": {
+        "cast": 0,
+        "recast": 900
+    },
+    "16536": {
+        "cast": 0,
+        "recast": 1200
+    },
+    "16538": {
+        "cast": 0,
+        "recast": 1200
+    },
+    "16548": {
+        "cast": 0,
+        "recast": 30
+    },
+    "16556": {
+        "cast": 0,
+        "recast": 300
+    },
+    "16559": {
+        "cast": 0,
+        "recast": 1200
+    },
+    "16889": {
+        "cast": 0,
+        "recast": 1200
+    },
+    "24291": {
+        "cast": 0,
+        "recast": 15
+    },
+    "24292": {
+        "cast": 0,
+        "recast": 15
+    },
+    "24298": {
+        "cast": 0,
+        "recast": 300
+    },
+    "24305": {
+        "cast": 0,
+        "recast": 1200
+    },
+    "24310": {
+        "cast": 0,
+        "recast": 1200
+    },
+    "24311": {
+        "cast": 0,
+        "recast": 1200
+    },
+    "25751": {
+        "cast": 0,
+        "recast": 250
+    },
+    "25789": {
+        "cast": 0,
+        "recast": 15
+    },
+    "25799": {
+        "cast": 0,
+        "recast": 600
+    },
+    "25857": {
+        "cast": 0,
+        "recast": 1200
+    },
+    "25868": {
+        "cast": 0,
+        "recast": 1200
+    },
+    "34685": {
+        "cast": 0,
+        "recast": 1200
+    },
+    "34686": {
+        "cast": 0,
+        "recast": 10
+    },
+    "36920": {
+        "cast": 0,
+        "recast": 1200
+    },
+    "37011": {
+        "cast": 0,
+        "recast": 10
+    },
+    "37025": {
+        "cast": 0,
+        "recast": 10
+    },
+    "37034": {
+        "cast": 0,
+        "recast": 15
+    }
+}
diff --git a/scripts/update_action_json.php b/scripts/update_action_json.php
new file mode 100644
index 0000000..35aae37
--- /dev/null
+++ b/scripts/update_action_json.php
@@ -0,0 +1,235 @@
+<?php
+declare(strict_types=1);
+
+ini_set('memory_limit', '1024M');
+
+const ACTION_SOURCE_URL = 'https://ff14.akurosiakamo.de/extras/json/xivapi_data/Action.json';
+
+$rootDir = dirname(__DIR__);
+$mitigationSource = $rootDir . '/api/analysis.php';
+$outputFile = $rootDir . '/assets/jsons/Action.json';
+
+function fail(string $message, int $code = 1): void
+{
+    fwrite(STDERR, $message . PHP_EOL);
+    exit($code);
+}
+
+function extract_constant_array_literal(string $php, string $constantName): string
+{
+    $needle = 'const ' . $constantName . ' =';
+    $start = strpos($php, $needle);
+
+    if ($start === false) {
+        fail('Could not find const ' . $constantName . ' in api/analysis.php');
+    }
+
+    $arrayStart = strpos($php, '[', $start);
+    if ($arrayStart === false) {
+        fail('Could not find array literal for ' . $constantName);
+    }
+
+    $depth = 0;
+    $length = strlen($php);
+    $inString = false;
+    $stringQuote = '';
+    $escaped = false;
+
+    for ($i = $arrayStart; $i < $length; $i++) {
+        $char = $php[$i];
+
+        if ($inString) {
+            if ($escaped) {
+                $escaped = false;
+                continue;
+            }
+
+            if ($char === '\\') {
+                $escaped = true;
+                continue;
+            }
+
+            if ($char === $stringQuote) {
+                $inString = false;
+                $stringQuote = '';
+            }
+
+            continue;
+        }
+
+        if ($char === '\'' || $char === '"') {
+            $inString = true;
+            $stringQuote = $char;
+            continue;
+        }
+
+        if ($char === '[') {
+            $depth++;
+            continue;
+        }
+
+        if ($char === ']') {
+            $depth--;
+
+            if ($depth === 0) {
+                return substr($php, $arrayStart, $i - $arrayStart + 1);
+            }
+        }
+    }
+
+    fail('Could not parse array literal for ' . $constantName);
+}
+
+function read_mitigation_action_ids(string $sourceFile): array
+{
+    if (!is_file($sourceFile)) {
+        fail('Missing mitigation source file: ' . $sourceFile);
+    }
+
+    $php = file_get_contents($sourceFile);
+    if ($php === false) {
+        fail('Could not read mitigation source file: ' . $sourceFile);
+    }
+
+    $literal = extract_constant_array_literal($php, 'MITIGATION_ABILITIES');
+    $abilities = eval('return ' . $literal . ';');
+
+    if (!is_array($abilities)) {
+        fail('MITIGATION_ABILITIES did not parse as an array');
+    }
+
+    $ids = [];
+    foreach ($abilities as $name => $ability) {
+        $id = (int)($ability['extraAbilityGameID'] ?? 0);
+        if ($id <= 0) {
+            fwrite(STDERR, 'Skipping mitigation without extraAbilityGameID: ' . $name . PHP_EOL);
+            continue;
+        }
+
+        $ids[$id] = true;
+    }
+
+    if (!$ids) {
+        fail('No extraAbilityGameID values found in MITIGATION_ABILITIES');
+    }
+
+    ksort($ids, SORT_NUMERIC);
+    return array_keys($ids);
+}
+
+function download_url(string $url): string
+{
+    $lastError = '';
+    $allowInsecureDownload = getenv('FF14_MITIGATOR_INSECURE_DOWNLOAD') === '1';
+
+    if (function_exists('curl_init')) {
+        $ch = curl_init($url);
+        curl_setopt_array($ch, [
+            CURLOPT_RETURNTRANSFER => true,
+            CURLOPT_FOLLOWLOCATION => true,
+            CURLOPT_CONNECTTIMEOUT => 15,
+            CURLOPT_TIMEOUT => 120,
+            CURLOPT_USERAGENT => 'ff14-mitigator-action-cache/1.0',
+            CURLOPT_SSL_VERIFYPEER => !$allowInsecureDownload,
+            CURLOPT_SSL_VERIFYHOST => $allowInsecureDownload ? 0 : 2,
+        ]);
+
+        $body = curl_exec($ch);
+        $error = curl_error($ch);
+        $status = (int)curl_getinfo($ch, CURLINFO_HTTP_CODE);
+        curl_close($ch);
+
+        if ($body !== false && $status >= 200 && $status < 300) {
+            return $body;
+        }
+
+        $lastError = 'cURL HTTP ' . $status . ($error ? ': ' . $error : '');
+    }
+
+    $wrappers = stream_get_wrappers();
+    if (in_array('https', $wrappers, true)) {
+        $context = stream_context_create([
+            'http' => [
+                'timeout' => 120,
+                'user_agent' => 'ff14-mitigator-action-cache/1.0',
+            ],
+            'ssl' => [
+                'verify_peer' => !$allowInsecureDownload,
+                'verify_peer_name' => !$allowInsecureDownload,
+            ],
+        ]);
+
+        $body = file_get_contents($url, false, $context);
+        if ($body !== false) {
+            return $body;
+        }
+
+        $lastError = trim($lastError . '; file_get_contents failed', '; ');
+    }
+
+    if ($lastError !== '') {
+        fail('Could not download Action.json. ' . $lastError);
+    }
+
+    fail('This PHP installation has neither cURL nor the HTTPS stream wrapper enabled.');
+}
+
+function action_field(array $action, string $field): ?int
+{
+    if (array_key_exists($field, $action) && is_numeric($action[$field])) {
+        return (int)$action[$field];
+    }
+
+    $fields = $action['fields'] ?? null;
+    if (is_array($fields) && array_key_exists($field, $fields) && is_numeric($fields[$field])) {
+        return (int)$fields[$field];
+    }
+
+    return null;
+}
+
+$actionIds = read_mitigation_action_ids($mitigationSource);
+$wanted = array_fill_keys(array_map('strval', $actionIds), true);
+
+$json = download_url(ACTION_SOURCE_URL);
+$actions = json_decode($json, true);
+
+if (!is_array($actions)) {
+    fail('Downloaded Action.json is not valid JSON: ' . json_last_error_msg());
+}
+
+$filtered = [];
+foreach ($wanted as $id => $_) {
+    $action = $actions[$id] ?? null;
+    if (!is_array($action)) {
+        fwrite(STDERR, 'Missing action in downloaded Action.json: ' . $id . PHP_EOL);
+        continue;
+    }
+
+    $filtered[$id] = [
+        'cast' => action_field($action, 'Cast100ms'),
+        'recast' => action_field($action, 'Recast100ms'),
+    ];
+}
+
+if (!$filtered) {
+    fail('No matching mitigation actions found in downloaded Action.json');
+}
+
+ksort($filtered, SORT_NUMERIC);
+
+$outputDir = dirname($outputFile);
+if (!is_dir($outputDir) && !mkdir($outputDir, 0775, true) && !is_dir($outputDir)) {
+    fail('Could not create output directory: ' . $outputDir);
+}
+
+$encoded = json_encode($filtered, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
+if ($encoded === false) {
+    fail('Could not encode filtered Action.json: ' . json_last_error_msg());
+}
+
+if (file_put_contents($outputFile, $encoded . PHP_EOL, LOCK_EX) === false) {
+    fail('Could not write output file: ' . $outputFile);
+}
+
+echo 'Saved ' . count($filtered) . ' actions to ' . $outputFile . PHP_EOL;