diff --git a/PROJECT_STATUS.md b/PROJECT_STATUS.md
index 0fbd7e6..0f57f72 100644
--- a/PROJECT_STATUS.md
+++ b/PROJECT_STATUS.md
@@ -18,6 +18,8 @@ maintenance-first support.
 
 ## Timeline
 
+- **2026-07-31:** Kept the public sitemap HTML-only and added source-level
+  sitemap/catalog/Markdown parity coverage.
 - **2026-07-31:** Added locally verified Open Graph/Twitter image metadata and
   SoftwareApplication structured data to the public landing layout; production
   deployment remains separate.
@@ -36,6 +38,7 @@ maintenance-first support.
   AI-assisted reading.
 - Account-backed and device-local capture paths.
 - Owned editorial product changelog at `/changelog`.
+- HTML-only public sitemap with cataloged Markdown mirrors for agent discovery.
 
 ## Work queue
 
diff --git a/docs/product/surfaces.md b/docs/product/surfaces.md
index 94cbc6c..c6b4d3c 100644
--- a/docs/product/surfaces.md
+++ b/docs/product/surfaces.md
@@ -32,7 +32,7 @@ Served from `public/` and the `agent-edge.mjs` handler in `src/worker.ts`
 | `index.md` | `/index.md` | Product brief in Markdown (no JS) |
 | `api/ai` | `/api/ai` | JSON catalog of public surfaces |
 | `robots.txt` | `/robots.txt` | Allows all + lists agent surfaces |
-| `sitemap.xml` | `/sitemap.xml` | Public URL inventory |
+| `sitemap.xml` | `/sitemap.xml` | Canonical public HTML page inventory |
 | IndexNow key | `/fa7259e2e0d942f1a1267b344a75a143.txt` | Bing/Yandex URL submission key |
 
 The agent-edge payload is generated into `src/agent-edge.mjs` by the fleet
diff --git a/public/sitemap.xml b/public/sitemap.xml
index 89838c7..393f8b2 100644
--- a/public/sitemap.xml
+++ b/public/sitemap.xml
@@ -1,7 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
   <url><loc>https://read.significanthobbies.com/</loc></url>
-  <url><loc>https://read.significanthobbies.com/index.md</loc></url>
-  <url><loc>https://read.significanthobbies.com/llms.txt</loc></url>
   <url><loc>https://read.significanthobbies.com/login</loc></url>
 </urlset>
diff --git a/src/agent-surfaces.test.ts b/src/agent-surfaces.test.ts
new file mode 100644
index 0000000..b55ecfe
--- /dev/null
+++ b/src/agent-surfaces.test.ts
@@ -0,0 +1,58 @@
+import { existsSync, readFileSync } from 'node:fs';
+import { resolve } from 'node:path';
+import { describe, expect, it } from 'vitest';
+
+const publicPath = (name: string) => resolve(process.cwd(), 'public', name);
+const readPublicFile = (name: string) => readFileSync(publicPath(name), 'utf8');
+
+const sitemap = readPublicFile('sitemap.xml');
+const catalog = JSON.parse(readPublicFile('api-ai.json')) as {
+  url: string;
+  llms: string;
+  llmsFull: string;
+  sitemap: string;
+  robots: string;
+  surfaces: Array<{ id: string; url: string; md: string }>;
+};
+
+const sitemapUrls = [...sitemap.matchAll(/<loc>([^<]+)<\/loc>/g)].map((match) => match[1]);
+
+describe('public agent surface parity', () => {
+  it('keeps the sitemap limited to cataloged HTML pages', () => {
+    expect(sitemapUrls.sort()).toEqual(catalog.surfaces.map((surface) => surface.url).sort());
+
+    for (const url of sitemapUrls) {
+      const pathname = new URL(url).pathname;
+      expect(pathname).not.toMatch(/\.(?:md|txt|json|xml)$/);
+      expect(pathname).not.toBe('/api/ai');
+    }
+  });
+
+  it('keeps one checked-in Markdown mirror for every cataloged HTML page', () => {
+    for (const surface of catalog.surfaces) {
+      const markdownUrl = new URL(surface.md);
+      expect(markdownUrl.origin).toBe(catalog.url);
+      expect(markdownUrl.pathname).toMatch(/\.md$/);
+      expect(existsSync(publicPath(markdownUrl.pathname.slice(1)))).toBe(true);
+    }
+  });
+
+  it('advertises machine resources outside the HTML sitemap', () => {
+    const discoverySources = [
+      readPublicFile('robots.txt'),
+      readPublicFile('llms.txt'),
+      readPublicFile('api-ai.json'),
+    ].join('\n');
+
+    for (const resource of [
+      '/llms.txt',
+      '/llms-full.txt',
+      '/index.md',
+      '/api/ai',
+      '/robots.txt',
+      '/sitemap.xml',
+    ]) {
+      expect(discoverySources).toContain(resource);
+    }
+  });
+});