diff --git a/package.json b/package.json
index 65eb24962..881febf87 100644
--- a/package.json
+++ b/package.json
@@ -34,6 +34,7 @@
     "smoke:routes": "node scripts/smoke-routes.mjs",
     "verify:release": "node scripts/verify-release.mjs",
     "backfill:agent-preview-images": "pnpm exec tsx scripts/backfill-agent-workflow-preview-images.ts",
+    "rewrite:agent-preview-image-urls": "pnpm exec tsx scripts/rewrite-agent-workflow-preview-image-urls.ts",
     "format": "pnpm exec ultracite fix",
     "db:generate": "drizzle-kit generate",
     "db:migrate": "npx tsx lib/db/migrate.ts",
diff --git a/scripts/rewrite-agent-workflow-preview-image-urls.ts b/scripts/rewrite-agent-workflow-preview-image-urls.ts
new file mode 100644
index 000000000..f81ff98b4
--- /dev/null
+++ b/scripts/rewrite-agent-workflow-preview-image-urls.ts
@@ -0,0 +1,191 @@
+import { config as loadEnv } from "dotenv";
+import { eq } from "drizzle-orm";
+import { mkdir, writeFile } from "node:fs/promises";
+import Module from "node:module";
+import path from "node:path";
+
+loadEnv({ path: ".env.local" });
+
+const moduleLoader = Module as typeof Module & {
+  _load: (request: string, parent: NodeModule | null, isMain: boolean) => unknown;
+};
+const originalLoad = moduleLoader._load;
+moduleLoader._load = function patchedServerOnlyLoad(
+  this: typeof moduleLoader,
+  request,
+  parent,
+  isMain
+) {
+  if (request === "server-only") {
+    return {};
+  }
+  return originalLoad.call(this, request, parent, isMain);
+};
+
+const PREVIEW_WIDTH = 230;
+const PREVIEW_QUALITY = 76;
+const dryRun = process.argv.includes("--dry-run");
+
+function normalizeUrl(value: unknown): string {
+  return String(value || "").trim();
+}
+
+function isAbsoluteHttpUrl(value: string) {
+  return /^https?:\/\//i.test(value);
+}
+
+function isUnsupportedPreviewSource(value: string) {
+  return !value || value.startsWith("data:") || value.startsWith("blob:");
+}
+
+function withoutKnownImageProcess(url: URL) {
+  const next = new URL(url.toString());
+  next.searchParams.delete("x-oss-process");
+  const rawSearch = next.search.replace(/^\?/, "");
+  if (/^imageView2\//i.test(rawSearch)) {
+    next.search = "";
+  }
+  return next;
+}
+
+function buildOptimizedPreviewUrl(source: string): string | null {
+  const normalized = normalizeUrl(source);
+  if (!isAbsoluteHttpUrl(normalized) || isUnsupportedPreviewSource(normalized)) {
+    return null;
+  }
+
+  let url: URL;
+  try {
+    url = new URL(normalized);
+  } catch {
+    return null;
+  }
+
+  const host = url.hostname.toLowerCase();
+  const sourceUrl = withoutKnownImageProcess(url);
+
+  if (host.includes("aliyuncs.com") || host.includes("oss-")) {
+    sourceUrl.searchParams.set(
+      "x-oss-process",
+      `image/resize,w_${PREVIEW_WIDTH}/quality,q_${PREVIEW_QUALITY}/format,webp`
+    );
+    return sourceUrl.toString();
+  }
+
+  if (host.includes("qiniu") || host.includes("clouddn") || host.includes("qiniucdn")) {
+    const separator = sourceUrl.search ? "&" : "?";
+    return `${sourceUrl.toString()}${separator}imageView2/2/w/${PREVIEW_WIDTH}/q/${PREVIEW_QUALITY}/format/webp`;
+  }
+
+  return null;
+}
+
+function visitOptions(options: any[], visitor: (option: any) => void) {
+  for (const option of options || []) {
+    visitor(option);
+    visitOptions(option.children || [], visitor);
+  }
+}
+
+function visitSteps(steps: any[], visitor: (option: any) => void) {
+  for (const step of steps || []) {
+    visitOptions(step.options || [], visitor);
+    visitSteps(step.children || [], visitor);
+  }
+}
+
+function createBackupPath() {
+  const timestamp = new Date().toISOString().replace(/[:.]/g, "-");
+  return path.join(
+    process.cwd(),
+    "backups",
+    `agent-workflow-ui-config-before-url-rewrite-${timestamp}.json`
+  );
+}
+
+async function main() {
+  const dbModule = await import("../lib/db");
+  const schemaModule = await import("../lib/db/schema");
+  const workflowConfig = await import("../lib/agents/workflow-ui-config");
+  const { db } = dbModule;
+  const { systemSettings } = schemaModule;
+
+  const [setting] = await db
+    .select({ value: systemSettings.value })
+    .from(systemSettings)
+    .where(eq(systemSettings.key, workflowConfig.AGENT_WORKFLOW_UI_CONFIG_KEY))
+    .limit(1);
+
+  if (!setting?.value) {
+    console.log("No agent workflow UI config found.");
+    return;
+  }
+
+  const normalized = workflowConfig.normalizeAgentWorkflowUiConfig(setting.value);
+  const nextConfig = structuredClone(normalized);
+  const summary = {
+    total: 0,
+    rewritten: 0,
+    skipped: 0,
+    unsupported: 0,
+  };
+
+  visitSteps(nextConfig.steps || [], (option) => {
+    summary.total += 1;
+    const currentPreview = normalizeUrl(option.previewImageUrl);
+    const source = normalizeUrl(option.previewImageSourceUrl) || currentPreview;
+    const optimized = buildOptimizedPreviewUrl(source);
+    if (!currentPreview || !source) {
+      summary.skipped += 1;
+      return;
+    }
+    if (!optimized) {
+      summary.unsupported += 1;
+      return;
+    }
+    if (currentPreview === optimized && option.previewImageSourceUrl === source) {
+      summary.skipped += 1;
+      return;
+    }
+    option.previewImageUrl = optimized;
+    option.previewImageSourceUrl = source;
+    summary.rewritten += 1;
+  });
+
+  console.log(JSON.stringify({ dryRun, summary }, null, 2));
+
+  if (dryRun || summary.rewritten === 0) {
+    return;
+  }
+
+  const backupPath = createBackupPath();
+  await mkdir(path.dirname(backupPath), { recursive: true });
+  await writeFile(
+    backupPath,
+    JSON.stringify(
+      {
+        key: workflowConfig.AGENT_WORKFLOW_UI_CONFIG_KEY,
+        backedUpAt: new Date().toISOString(),
+        value: setting.value,
+      },
+      null,
+      2
+    )
+  );
+  console.log(`Backup written: ${backupPath}`);
+
+  await db
+    .update(systemSettings)
+    .set({
+      value: nextConfig,
+      updatedAt: new Date(),
+    })
+    .where(eq(systemSettings.key, workflowConfig.AGENT_WORKFLOW_UI_CONFIG_KEY));
+  console.log(`Rewritten ${summary.rewritten} agent workflow preview image URLs.`);
+}
+
+main().catch((error) => {
+  console.error(error);
+  process.exit(1);
+});
+