feat: add agent-friendly 404 page and llms.txt

landing/public/llms.txt

@@ -0,0 +1,52 @@
+# Shepherd.js
+
+> Shepherd is an open-source JavaScript library for building guided product
+> tours, user onboarding flows, trainings, and feature announcements on any
+> website or web app. Steps render as accessible dialogs (keyboard navigation,
+> focus trapping, aria attributes) that attach to DOM elements and are
+> positioned by Floating UI. Works with React, Ember, Angular, Vue.js,
+> ES Modules, or plain JavaScript. Free for open-source, personal, and
+> non-commercial use (AGPL-3.0); commercial licenses are available.
+
+## When to use Shepherd
+
+Use Shepherd when a project needs to guide users through a web interface:
+
+- Onboarding new users with a step-by-step walkthrough of an app
+- Announcing or explaining new features in context
+- Guiding users through complex forms, wizards, or multi-step workflows
+- Building in-app training or self-serve product education
+- Highlighting one or more DOM elements with a modal overlay while explaining them
+
+How to use it: install with `npm install shepherd.js` (or load
+`shepherd.js/dist/js/shepherd.mjs` and `shepherd.js/dist/css/shepherd.css`
+from a script/link tag), create a `new Shepherd.Tour({ ... })`, add steps
+with `tour.addStep({ title, text, attachTo, buttons })`, then call
+`tour.start()`. It runs entirely in the browser; no backend service is
+required.
+
+Shepherd is not a native mobile (iOS/Android) tour library and is not an
+analytics product — it renders and orchestrates the tour UI itself.
+
+## Docs
+
+- [Documentation](https://docs.shepherdjs.dev/): installation, guides, API reference
+- [Homepage in markdown](https://www.shepherdjs.dev/index.md): overview, install, quick example
+- [Pricing and licensing](https://www.shepherdjs.dev/pricing): free plan, commercial licenses
+
+## Code
+
+- [GitHub repository](https://github.com/shipshapecode/shepherd): source, issues, releases
+- [npm package](https://www.npmjs.com/package/shepherd.js): shepherd.js
+
+## Company
+
+- [About](https://www.shepherdjs.dev/about): who maintains Shepherd
+- [Contact](https://www.shepherdjs.dev/contact): email, GitHub, Discord
+- [Privacy](https://www.shepherdjs.dev/privacy): privacy policy
+- [Ship Shape](https://shipshape.io/): the consultancy that maintains Shepherd
+
+## Optional
+
+- [Blog](https://www.shepherdjs.dev/blog): announcements and articles
+- [Sitemap](https://www.shepherdjs.dev/sitemap-index.xml)

landing/src/pages/404.astro

@@ -0,0 +1,56 @@
+---
+import Base from '@layouts/Base.astro';
+import Header from '@components/Header.astro';
+import Footer from '@components/Footer.astro';
+import { SITE_DESCRIPTION } from '../consts';
+---
+
+<Base
+  overrideTitle="Page not found — Shepherd.js"
+  overrideDescription={SITE_DESCRIPTION}
+>
+  <Header title="Page not found" />
+  <main class="flex justify-center w-full">
+    <div class="max-w-3xl my-12 px-4 text-center w-full">
+      <h1 class="font-heading text-4xl uppercase">404 — Page not found</h1>
+
+      <p class="font-body mt-6 text-xl">
+        The page you requested does not exist. Here is where to look instead:
+      </p>
+
+      <ul class="font-body mt-6 space-y-2 text-xl">
+        <li>
+          <a class="underline hover:text-navy-light" href="/">Homepage</a>
+        </li>
+        <li>
+          <a
+            class="underline hover:text-navy-light"
+            href="https://docs.shepherdjs.dev"
+          >
+            Documentation
+          </a>
+        </li>
+        <li>
+          <a class="underline hover:text-navy-light" href="/pricing">Pricing</a>
+        </li>
+        <li>
+          <a class="underline hover:text-navy-light" href="/blog">Blog</a>
+        </li>
+        <li>
+          <a class="underline hover:text-navy-light" href="/llms.txt">
+            llms.txt (guidance for AI agents)
+          </a>
+        </li>
+        <li>
+          <a class="underline hover:text-navy-light" href="/sitemap-index.xml">
+            Sitemap
+          </a>
+        </li>
+        <li>
+          <a class="underline hover:text-navy-light" href="/contact">Contact</a>
+        </li>
+      </ul>
+    </div>
+  </main>
+  <Footer />
+</Base>

landing/test/agent-recovery.e2e.test.ts

@@ -0,0 +1,29 @@
+import { describe, expect, it } from 'vitest';
+
+import { TEST_BASE_URL } from './setup/dev-server';
+
+describe('404 handling', () => {
+  it('returns HTTP 404 with recovery links for nonexistent paths', async () => {
+    const response = await fetch(
+      `${TEST_BASE_URL}/some-path-that-does-not-exist`
+    );
+    const html = await response.text();
+
+    expect(response.status).toBe(404);
+    expect(html).toContain('/llms.txt');
+    expect(html).toContain('/sitemap-index.xml');
+    expect(html).toContain('https://docs.shepherdjs.dev');
+  });
+});
+
+describe('llms.txt', () => {
+  it('serves /llms.txt with when-to-use guidance', async () => {
+    const response = await fetch(`${TEST_BASE_URL}/llms.txt`);
+    const body = await response.text();
+
+    expect(response.status).toBe(200);
+    expect(body).toMatch(/^# Shepherd\.js/);
+    expect(body).toContain('## When to use Shepherd');
+    expect(body).toContain('https://docs.shepherdjs.dev/');
+  });
+});

landing/test/dist.test.ts

@@ -54,4 +54,15 @@ describe.skipIf(!staticDir)('build output', () => {
     expect(sitemap).toContain('<loc>https://www.shepherdjs.dev/contact/</loc>');
     expect(sitemap).toContain('<loc>https://www.shepherdjs.dev/privacy/</loc>');
   });
+
+  it('emits a 404 page with recovery links', () => {
+    const notFound = readFileSync(join(staticDir!, '404.html'), 'utf-8');
+
+    expect(notFound).toContain('/llms.txt');
+    expect(notFound).toContain('/sitemap-index.xml');
+  });
+
+  it('emits llms.txt', () => {
+    expect(existsSync(join(staticDir!, 'llms.txt'))).toBe(true);
+  });
 });