Migrate docs from Mintlify to fumadocs

.gitignore

@@ -1,9 +1,26 @@
-*/.DS_Store
+# deps
+/node_modules
+
+# generated content
+.source
+
+# test & build
+/coverage
+/.next/
+/out/
+/build
+*.tsbuildinfo
+
+# misc
 .DS_Store
-.env
+*.pem
+/.pnp
+.pnp.js
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
 
-node_modules/
-venv
-__pycache__/**
-test.py
-./kernel/**
+# others
+.env*.local
+.vercel
+next-env.d.ts

AGENTS.md

@@ -17,8 +17,8 @@
 
 ## Cursor Cloud specific instructions
 
-This is a Mintlify documentation site (no `package.json`). The only service is the docs preview server.
+This is a fumadocs (Next.js) documentation site. Content lives in `content/docs/` as MDX.
 
-- **Run the docs site:** `mintlify dev` (serves on `http://localhost:3000` by default; auto-increments if the port is busy)
-- **Lint/build:** Mintlify handles rendering; there's no separate lint or build step. Validate by running `mintlify dev` and checking pages load.
-- **Config:** `docs.json` is the main Mintlify config (navigation, theme, OpenAPI spec URL, redirects).
+- **Run the docs site:** `bun dev` (serves on `http://localhost:3000`)
+- **Lint/build:** `bun run build` compiles every page; `bun run lint` runs Biome. Validate changes with a build.
+- **Config:** `docs.json` remains the navigation source of truth (tabs/groups/redirects); `lib/tree.ts` converts it to the sidebar at build time. Mintlify components (`<Info>`, `<CodeGroup>`, `<Steps>`, ...) still work — they're aliased in `components/mdx.tsx`.

README.md

@@ -26,7 +26,8 @@ When you add Go examples:
 To run the docs locally, you can use the following command:
 
 ```bash
-mintlify dev
+bun install
+bun dev
 ```
 
 ## Contributing

app/(docs)/[[...slug]]/page.tsx

@@ -0,0 +1,67 @@
+import {
+  DocsBody,
+  DocsDescription,
+  DocsPage,
+  DocsTitle,
+  MarkdownCopyButton,
+  ViewOptionsPopover,
+} from "fumadocs-ui/layouts/docs/page";
+import { createRelativeLink } from "fumadocs-ui/mdx";
+import type { Metadata } from "next";
+import { notFound } from "next/navigation";
+import { getMDXComponents } from "@/components/mdx";
+import { gitConfig } from "@/lib/shared";
+import { getPageImage, getPageMarkdownUrl, source } from "@/lib/source";
+
+export default async function Page(props: PageProps<"/[[...slug]]">) {
+  const params = await props.params;
+  const page = source.getPage(params.slug);
+  if (!page) notFound();
+
+  const MDX = page.data.body;
+  const markdownUrl = getPageMarkdownUrl(page).url;
+
+  return (
+    <DocsPage toc={page.data.toc} full={page.data.full}>
+      <DocsTitle>{page.data.title}</DocsTitle>
+      <DocsDescription className="mb-0">
+        {page.data.description}
+      </DocsDescription>
+      <div className="flex flex-row gap-2 items-center border-b pb-6">
+        <MarkdownCopyButton markdownUrl={markdownUrl} />
+        <ViewOptionsPopover
+          markdownUrl={markdownUrl}
+          githubUrl={`https://github.com/${gitConfig.user}/${gitConfig.repo}/blob/${gitConfig.branch}/content/docs/${page.path}`}
+        />
+      </div>
+      <DocsBody>
+        <MDX
+          components={getMDXComponents({
+            // this allows you to link to other pages with relative file paths
+            a: createRelativeLink(source, page),
+          })}
+        />
+      </DocsBody>
+    </DocsPage>
+  );
+}
+
+export async function generateStaticParams() {
+  return source.generateParams();
+}
+
+export async function generateMetadata(
+  props: PageProps<"/[[...slug]]">,
+): Promise<Metadata> {
+  const params = await props.params;
+  const page = source.getPage(params.slug);
+  if (!page) notFound();
+
+  return {
+    title: page.data.title,
+    description: page.data.description,
+    openGraph: {
+      images: getPageImage(page).url,
+    },
+  };
+}

app/(docs)/api-reference/[[...slug]]/page.tsx

@@ -0,0 +1,35 @@
+import { DocsBody, DocsPage } from "fumadocs-ui/layouts/docs/page";
+import type { Metadata } from "next";
+import { notFound } from "next/navigation";
+import { OpenAPIPage } from "@/components/api-page";
+import { apiSource } from "@/lib/source";
+
+export default async function Page(
+  props: PageProps<"/api-reference/[[...slug]]">,
+) {
+  const params = await props.params;
+  const page = apiSource.getPage(params.slug);
+  if (!page) notFound();
+
+  return (
+    <DocsPage toc={page.data.toc}>
+      <DocsBody>
+        <OpenAPIPage {...page.data.getOpenAPIPageProps()} />
+      </DocsBody>
+    </DocsPage>
+  );
+}
+
+export function generateStaticParams() {
+  return apiSource.generateParams();
+}
+
+export async function generateMetadata(
+  props: PageProps<"/api-reference/[[...slug]]">,
+): Promise<Metadata> {
+  const params = await props.params;
+  const page = apiSource.getPage(params.slug);
+  if (!page) notFound();
+
+  return { title: page.data.title, description: page.data.description };
+}

app/(docs)/layout.tsx

@@ -0,0 +1,35 @@
+import { buttonVariants } from "fumadocs-ui/components/ui/button";
+import { DocsLayout } from "fumadocs-ui/layouts/docs";
+import { MessageCircleIcon } from "lucide-react";
+import {
+  AISearch,
+  AISearchPanel,
+  AISearchTrigger,
+} from "@/components/ai/search";
+import { cn } from "@/lib/cn";
+import { baseOptions } from "@/lib/layout.shared";
+import { buildTree } from "@/lib/tree";
+
+export default function Layout({ children }: LayoutProps<"/">) {
+  return (
+    <DocsLayout tree={buildTree()} {...baseOptions()}>
+      <AISearch>
+        <AISearchPanel />
+        <AISearchTrigger
+          position="float"
+          className={cn(
+            buttonVariants({
+              variant: "secondary",
+              className: "text-fd-muted-foreground rounded-2xl",
+            }),
+          )}
+        >
+          <MessageCircleIcon className="size-4.5" />
+          Ask AI
+        </AISearchTrigger>
+      </AISearch>
+
+      {children}
+    </DocsLayout>
+  );
+}

app/api/chat/route.ts

@@ -0,0 +1,116 @@
+import { createAnthropic } from "@ai-sdk/anthropic";
+import {
+  convertToModelMessages,
+  createUIMessageStreamResponse,
+  stepCountIs,
+  streamText,
+  tool,
+  toUIMessageStream,
+} from "ai";
+import { Document, type DocumentData } from "flexsearch";
+import { z } from "zod";
+import { source } from "@/lib/source";
+import type { ChatUIMessage, SearchTool } from "../../../components/ai/search";
+
+interface CustomDocument extends DocumentData {
+  url: string;
+  title: string;
+  description: string;
+  content: string;
+}
+const searchServer = createSearchServer();
+
+async function createSearchServer() {
+  const search = new Document<CustomDocument>({
+    document: {
+      id: "url",
+      index: ["title", "description", "content"],
+      store: true,
+    },
+  });
+
+  const docs = await chunkedAll(
+    source.getPages().map(async (page) => {
+      if (!("getText" in page.data)) return null;
+
+      return {
+        title: page.data.title,
+        description: page.data.description,
+        url: page.url,
+        content: await page.data.getText("processed"),
+      } as CustomDocument;
+    }),
+  );
+
+  for (const doc of docs) {
+    if (doc) search.add(doc);
+  }
+
+  return search;
+}
+
+async function chunkedAll<O>(promises: Promise<O>[]): Promise<O[]> {
+  const SIZE = 50;
+  const out: O[] = [];
+  for (let i = 0; i < promises.length; i += SIZE) {
+    out.push(...(await Promise.all(promises.slice(i, i + SIZE))));
+  }
+  return out;
+}
+
+const anthropic = createAnthropic({
+  apiKey: process.env.ANTHROPIC_API_KEY,
+});
+
+/** System prompt, you can update it to provide more specific information */
+const systemPrompt = [
+  "You are an AI assistant for the Kernel documentation site (Kernel provides sandboxed cloud browsers for automations and web agents).",
+  "Use the `search` tool to retrieve relevant docs context before answering when needed.",
+  "The `search` tool returns raw JSON results from documentation. Use those results to ground your answer and cite sources as markdown links using the document `url` field when available.",
+  "If you cannot find the answer in search results, say you do not know and suggest a better search query.",
+].join("\n");
+
+export async function POST(req: Request, _ctx: RouteContext<"/api/chat">) {
+  const reqJson = await req.json();
+
+  const result = streamText({
+    model: anthropic(process.env.ANTHROPIC_MODEL ?? "claude-haiku-4-5-20251001"),
+    stopWhen: stepCountIs(5),
+    tools: {
+      search: searchTool,
+    },
+    messages: [
+      { role: "system", content: systemPrompt },
+      ...(await convertToModelMessages<ChatUIMessage>(reqJson.messages ?? [], {
+        convertDataPart(part) {
+          if (part.type === "data-client")
+            return {
+              type: "text",
+              text: `[Client Context: ${JSON.stringify(part.data)}]`,
+            };
+        },
+      })),
+    ],
+    toolChoice: "auto",
+  });
+
+  return createUIMessageStreamResponse({
+    stream: toUIMessageStream({ stream: result.stream }),
+  });
+}
+
+const searchTool = tool({
+  description: "Search the docs content and return raw JSON results.",
+  inputSchema: z.object({
+    query: z.string(),
+    limit: z.number().int().min(1).max(100).default(10),
+  }),
+  async execute({ query, limit }) {
+    const search = await searchServer;
+    return await search.searchAsync(query, {
+      limit,
+      merge: true,
+      enrich: true,
+    });
+  },
+}) satisfies SearchTool;

app/api/search/route.ts

@@ -0,0 +1,7 @@
+import { createFromSource } from "fumadocs-core/search/server";
+import { source } from "@/lib/source";
+
+export const { GET } = createFromSource(source, {
+  // https://docs.orama.com/docs/orama-js/supported-languages
+  language: "english",
+});

app/global.css

@@ -0,0 +1,23 @@
+@import "tailwindcss";
+@import "fumadocs-ui/css/neutral.css";
+@import "fumadocs-ui/css/preset.css";
+
+/* Kernel brand (ported from Mintlify docs.json colors) */
+:root {
+  --color-fd-background: hsl(240 10% 95%); /* #F0F0F3 */
+  --color-fd-primary: hsl(228 6% 14%); /* #212225 */
+}
+
+.dark {
+  --color-fd-background: hsl(228 6% 14%); /* #212225 */
+  --color-fd-primary: hsl(48 47% 60%); /* #CAB168 */
+}
+
+html {
+  scrollbar-gutter: stable;
+}
+
+html > body[data-scroll-locked] {
+  margin-right: 0px;
+  --removed-body-scroll-bar-size: 0px;
+}

app/layout.tsx

@@ -0,0 +1,37 @@
+import { RootProvider } from "fumadocs-ui/provider/next";
+import "./global.css";
+import type { Metadata } from "next";
+import { Inter } from "next/font/google";
+import Script from "next/script";
+
+const inter = Inter({
+  subsets: ["latin"],
+});
+
+export const metadata: Metadata = {
+  title: {
+    template: "%s - Kernel",
+    default: "Kernel Documentation",
+  },
+  icons: { icon: "/favicon.svg" },
+};
+
+export default function Layout({ children }: LayoutProps<"/">) {
+  return (
+    <html lang="en" className={inter.className} suppressHydrationWarning>
+      <body className="flex flex-col min-h-screen">
+        <RootProvider>{children}</RootProvider>
+        <Script
+          src="https://www.googletagmanager.com/gtag/js?id=G-GVEXRLYSN4"
+          strategy="afterInteractive"
+        />
+        <Script id="ga4" strategy="afterInteractive">
+          {`window.dataLayer = window.dataLayer || [];
+            function gtag(){dataLayer.push(arguments);}
+            gtag('js', new Date());
+            gtag('config', 'G-GVEXRLYSN4');`}
+        </Script>
+      </body>
+    </html>
+  );
+}

app/llms-full.txt/route.ts

@@ -0,0 +1,10 @@
+import { getLLMText, source } from "@/lib/source";
+
+export const revalidate = false;
+
+export async function GET() {
+  const scan = source.getPages().map(getLLMText);
+  const scanned = await Promise.all(scan);
+
+  return new Response(scanned.join("\n\n"));
+}