diff --git a/.github/scripts/release-guard.cjs b/.github/scripts/release-guard.cjs
index ec466fa..768c372 100644
--- a/.github/scripts/release-guard.cjs
+++ b/.github/scripts/release-guard.cjs
@@ -61,6 +61,19 @@ function buildArchives(temp, dist) {
   }
   return digests;
 }
+// 仅输出诊断白名单；禁止输出令牌、完整响应头或原始响应正文。
+function formatApiError(method, endpoint, response, body, secrets = []) {
+  const clean = value => {
+    let text = String(value ?? '');
+    for (const secret of secrets.filter(Boolean)) text = text.split(secret).join('[REDACTED]');
+    return text.replace(/Bearer\s+[^\s,;]+/gi, 'Bearer [REDACTED]').replace(/[\r\n\x00-\x1f\x7f]/g, ' ');
+  };
+  const route = endpoint.startsWith('https://') ? new URL(endpoint).pathname : endpoint.split('?')[0];
+  const details = ['x-ratelimit-remaining', 'x-ratelimit-reset', 'x-ratelimit-resource', 'retry-after']
+    .map(name => `${name}=${clean(response.headers.get(name) ?? 'unknown').slice(0, 100)}`).join(' ');
+  const message = typeof body?.message === 'string' ? clean(body.message).slice(0, 300) : 'unavailable';
+  return `GitHub API ${clean(method)} ${clean(route)}: ${response.status}; ${details}; message=${message}`;
+}
 async function main() {
   insist(process.env.GITHUB_EVENT_NAME === 'workflow_run', '仅允许 workflow_run');
   const repo = process.env.GITHUB_REPOSITORY;
@@ -74,7 +87,10 @@ async function main() {
     insist(url.startsWith(`${root}/`) || url.startsWith(`https://uploads.github.com/repos/${repo}/`), '非预期 API 目标');
     const response = await fetch(url, { signal: AbortSignal.timeout(30000), method, headers: { ...(endpoint.startsWith('/actions/') && method === 'GET' ? {} : { Authorization: `Bearer ${token}` }), Accept: 'application/vnd.github+json', 'X-GitHub-Api-Version': '2022-11-28', ...(body ? { 'Content-Type': binary ? 'application/zip' : 'application/json' } : {}) }, body: body ? (binary ? body : JSON.stringify(body)) : undefined });
     if (optional && response.status === 404) return null;
-    insist(response.ok, `GitHub API ${method} ${endpoint}: ${response.status}`);
+    if (!response.ok) {
+      const errorBody = await response.json().catch(() => null);
+      throw new Error(formatApiError(method, endpoint, response, errorBody, [token]));
+    }
     return response.json();
   }
   const verifyDownloads = async release => {
@@ -138,5 +154,5 @@ async function main() {
     console.log(`发布成功：${release.html_url}；SHA=${sha}；两份 ZIP SHA-256 已验证`);
   } finally { fs.rmSync(temp, { recursive: true, force: true }); }
 }
-module.exports = { guardRun, guardVersions, guardExisting, buildArchives, VERSION, TAG, ASSETS };
+module.exports = { guardRun, guardVersions, guardExisting, buildArchives, formatApiError, VERSION, TAG, ASSETS };
 if (require.main === module) main().catch(error => { console.error(error.message); process.exitCode = 1; });
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 2360d68..4c95233 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -92,9 +92,25 @@ jobs:
             const repo = process.env.GITHUB_REPOSITORY;
             const assert = (ok, message) => { if (!ok) throw new Error(message); };
             assert(repo === 'Thregren/InfinityTime' && event.repository.full_name === repo && event.repository.fork === false, '目标仓库不匹配');
+            // 仅输出诊断白名单；禁止输出令牌、完整响应头或原始响应正文。
+            function formatApiError(method, endpoint, response, body, secrets = []) {
+              const clean = value => {
+                let text = String(value ?? '');
+                for (const secret of secrets.filter(Boolean)) text = text.split(secret).join('[REDACTED]');
+                return text.replace(/Bearer\s+[^\s,;]+/gi, 'Bearer [REDACTED]').replace(/[\r\n\x00-\x1f\x7f]/g, ' ');
+              };
+              const route = endpoint.startsWith('https://') ? new URL(endpoint).pathname : endpoint.split('?')[0];
+              const details = ['x-ratelimit-remaining', 'x-ratelimit-reset', 'x-ratelimit-resource', 'retry-after']
+                .map(name => `${name}=${clean(response.headers.get(name) ?? 'unknown').slice(0, 100)}`).join(' ');
+              const message = typeof body?.message === 'string' ? clean(body.message).slice(0, 300) : 'unavailable';
+              return `GitHub API ${clean(method)} ${clean(route)}: ${response.status}; ${details}; message=${message}`;
+            }
             const get = async path => {
               const response = await fetch(`https://api.github.com/repos/${repo}${path}`, { signal: AbortSignal.timeout(30000), headers: { ...(path.startsWith('/actions/') ? {} : { Authorization: `Bearer ${process.env.GH_TOKEN}` }), Accept: 'application/vnd.github+json', 'X-GitHub-Api-Version': '2022-11-28' } });
-              assert(response.ok, `GitHub API ${response.status}`);
+              if (!response.ok) {
+                const errorBody = await response.json().catch(() => null);
+                throw new Error(formatApiError('GET', path, response, errorBody, [process.env.GH_TOKEN]));
+              }
               return response.json();
             };
             const main = await get('/git/ref/heads/main');
diff --git a/tests/gallery-loading-browser.cjs b/tests/gallery-loading-browser.cjs
index 1aecdd7..76b9bda 100644
--- a/tests/gallery-loading-browser.cjs
+++ b/tests/gallery-loading-browser.cjs
@@ -166,8 +166,24 @@ const pixel = '<svg xmlns="http://www.w3.org/2000/svg" width="640" height="400">
       assert.equal(await page.locator('#stale').count(), 0);
       assert.equal(await page.locator('#fresh').count(), 1);
       assert.equal(await page.locator('.pp-load-retry').isVisible(), false);
-      await page.evaluate(() => InfinityWaterfall.reset({ nextUrl: '/empty' }));
-      assert.equal(await page.evaluate(() => InfinityWaterfall.loadMore()), true, '合法的搜索末尾空批次能正常结束');
+      // 同一浏览器任务内重置并发起明确请求，避免原生滚动事件在两次 evaluate 间抢先加载。
+      assert.equal(await page.evaluate(() => {
+        InfinityWaterfall.reset({ nextUrl: '/empty' });
+        return InfinityWaterfall.loadMore();
+      }), true, '合法的搜索末尾空批次能正常结束');
+      assert.equal(await page.locator('.pp-load-retry').isVisible(), false);
+      // 自动滚动另行通过真实事件路径验证，不依赖上面的手动调用时序。
+      const emptyRequests = requests.filter(p => p === '/empty').length;
+      await page.evaluate(() => {
+        InfinityWaterfall.reset({ nextUrl: '/empty' });
+        window.scrollTo(0, document.documentElement.scrollHeight);
+        window.dispatchEvent(new Event('scroll'));
+      });
+      await page.waitForFunction(() => {
+        const more = document.querySelector('#load-more');
+        return more.getAttribute('data-next-url') === '' && more.getAttribute('aria-busy') === 'false';
+      });
+      assert.equal(requests.filter(p => p === '/empty').length, emptyRequests + 1, '自动滚动恰好加载一次合法末尾空批次');
       assert.equal(await page.locator('.pp-load-retry').isVisible(), false);
       // AVIF 请求和解码失败均必须尝试可用 WebP，不能仅显示永久失败。
       await page.evaluate(html => {
diff --git a/tests/release-guards.cjs b/tests/release-guards.cjs
index af73994..d580fd4 100644
--- a/tests/release-guards.cjs
+++ b/tests/release-guards.cjs
@@ -88,3 +88,27 @@ test('真实 ZIP 构建确定性、单根目录、排除 data，拒绝 symlink',
     assert.throws(() => build('unsafe'), /非普通文件/);
   } finally { process.chdir(old); fs.rmSync(root, { recursive: true, force: true }); }
 });
+
+test('API 错误诊断仅输出白名单和截断 message，隐藏令牌与敏感头', () => {
+  const { formatApiError } = require('../.github/scripts/release-guard.cjs');
+  const response = { status: 403, headers: new Headers({
+    'x-ratelimit-remaining': '0', 'x-ratelimit-reset': '1234567890',
+    'x-ratelimit-resource': 'core', 'retry-after': '60',
+    authorization: 'Bearer secret-header', 'set-cookie': 'private-cookie',
+  }) };
+  const result = formatApiError('GET', '/actions/runs/123?secret=query-secret', response,
+    { message: `rate limited known-token Bearer unknown-token\n${'x'.repeat(500)}`, secret: 'raw-body-secret' }, ['known-token']);
+  assert.match(result, /GET \/actions\/runs\/123: 403/);
+  for (const detail of ['x-ratelimit-remaining=0', 'x-ratelimit-reset=1234567890', 'x-ratelimit-resource=core', 'retry-after=60']) assert(result.includes(detail));
+  for (const secret of ['known-token', 'unknown-token', 'secret-header', 'private-cookie', 'raw-body-secret', 'query-secret', '\n']) assert(!result.includes(secret));
+  assert(result.includes('[REDACTED]'));
+  assert(result.split('; message=')[1].length <= 300);
+  assert.match(formatApiError('POST', 'https://uploads.github.com/repos/a/b/releases/1/assets?name=test', response, null), /POST \/repos\/a\/b\/releases\/1\/assets: 403/);
+});
+test('checkout 前 inline API 错误格式与共享测试函数完全一致', () => {
+  const fs = require('node:fs');
+  const { formatApiError } = require('../.github/scripts/release-guard.cjs');
+  const workflow = fs.readFileSync('.github/workflows/release.yml', 'utf8');
+  const lines = workflow.split('\n').map(line => line.startsWith('            ') ? line.slice(12) : line).join('\n');
+  assert(lines.includes(formatApiError.toString()));
+});