diff --git a/website/README.md b/website/README.md
index d5f4e582..956e66a2 100644
--- a/website/README.md
+++ b/website/README.md
@@ -46,15 +46,20 @@ Sidebar order is defined in `astro.config.mjs`, not by directory order.
 | :--------------------- | :--------------------------------------------------------- |
 | `pnpm install`         | Install dependencies                                       |
 | `pnpm dev`             | Start local dev server at `localhost:4321`                 |
-| `pnpm build`           | Build the production site to `./dist/`                     |
+| `pnpm build`           | Build the production site to `./dist/` and test its output |
 | `pnpm preview`         | Preview the production build locally                       |
 | `pnpm test`            | Test site plugins with Node's built-in test runner          |
+| `pnpm test:build`      | Test rendered Markdown/MDX tables in `dist/` after a build |
 | `pnpm refresh:openapi` | Generate the OpenAPI snapshot from `scope-core` |
 
 ## Authoring docs
 
 - Use `.md` for plain Markdown, `.mdx` whenever the page contains JSX
   (e.g. Starlight `<Tabs>`).
+- Use standard pipe-delimited Markdown tables in both `.md` and `.mdx`.
+  Keep `markdown.gfm: true` explicit in [astro.config.mjs](astro.config.mjs):
+  the installed MDX integration does not inherit Astro's Markdown processor
+  defaults, so otherwise MDX tables render as plain text.
 - Write internal Markdown links and literal MDX `href`/`src` attributes
   relative to the site root, such as `/getting-started/access/`.
   [src/plugins/remark-base-path.mjs](src/plugins/remark-base-path.mjs)
@@ -109,6 +114,8 @@ SITE=https://microsoft.github.io BASE_PATH=/scope pnpm preview
 
 Open `/scope/` on the preview server. Keep `BASE_PATH` the same for the
 build and preview so assets, navigation, and search use the same URLs.
+`pnpm build` runs `pnpm test:build` after generating the site, so local and
+CI builds catch table-rendering regressions in both Markdown and MDX pages.
 
 ## Learn more
 
diff --git a/website/astro.config.mjs b/website/astro.config.mjs
index 3f662e00..13542618 100644
--- a/website/astro.config.mjs
+++ b/website/astro.config.mjs
@@ -55,6 +55,8 @@ export default defineConfig({
 	base,
 	server: { port: docPort },
 	markdown: {
+		// The installed MDX integration does not inherit the processor's GFM default.
+		gfm: true,
 		remarkPlugins: [[remarkBasePath, { base }], remarkHttpSnippets],
 	},
 	integrations: [
diff --git a/website/package.json b/website/package.json
index 513b77f9..0cc7a877 100644
--- a/website/package.json
+++ b/website/package.json
@@ -6,9 +6,10 @@
   "scripts": {
     "dev": "worktree-env && astro dev",
     "start": "worktree-env && astro dev",
-    "build": "astro build",
+    "build": "astro build && pnpm test:build",
     "preview": "worktree-env && astro preview",
     "test": "node --test src/plugins/*.test.mjs",
+    "test:build": "node --test tests/*.test.mjs",
     "astro": "astro",
     "refresh:openapi": "cd .. && pnpm --filter api generate:openapi"
   },
diff --git a/website/tests/tables.test.mjs b/website/tests/tables.test.mjs
new file mode 100644
index 00000000..1de1c168
--- /dev/null
+++ b/website/tests/tables.test.mjs
@@ -0,0 +1,59 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT License.
+
+import assert from 'node:assert/strict';
+import { readFile } from 'node:fs/promises';
+import { test } from 'node:test';
+
+async function readTables(page) {
+	const html = await readFile(new URL(`../dist/${page}/index.html`, import.meta.url), 'utf8');
+	return html.match(/<table\b[^>]*>[\s\S]*?<\/table>/g) ?? [];
+}
+
+function assertTable(table, headers, fields) {
+	assert.deepEqual(
+		Array.from(table.matchAll(/<th\b[^>]*>([\s\S]*?)<\/th>/g), ([, text]) => text),
+		headers,
+	);
+	assert.deepEqual(
+		Array.from(
+			table.matchAll(/<tr\b[^>]*>\s*<td\b[^>]*><code\b[^>]*>([^<]+)<\/code>/g),
+			([, field]) => field,
+		),
+		fields,
+	);
+	assert.equal(Array.from(table.matchAll(/<td\b/g)).length, headers.length * fields.length);
+}
+
+test('renders the MDX profile anatomy as a table with all fields and inline formatting', async () => {
+	const tables = await readTables('guides/defining-profiles');
+	assert.equal(tables.length, 1, 'The profile anatomy must render as an HTML table, not pipe-delimited text');
+	assertTable(tables[0], ['Field', 'Layer', 'Description'], [
+		'name',
+		'description',
+		'workerType',
+		'model',
+		'agentVersion',
+		'mcpServers',
+		'skillRevisions',
+		'extensions',
+	]);
+	assert.match(tables[0], /<a href="[^"]*\/guides\/choosing-a-coding-agent\/">Choosing a coding agent<\/a>/);
+	assert.match(tables[0], /<strong>VS Code Copilot only\.<\/strong>/);
+});
+
+test('preserves tables in the plain Markdown profile schema reference', async () => {
+	const tables = await readTables('reference/profile-schema');
+	assert.equal(tables.length, 2);
+	assertTable(tables[0], ['Field', 'Type', 'Required', 'Description'], ['id', 'name', 'description']);
+	assertTable(tables[1], ['Field', 'Type', 'Required', 'Description'], [
+		'id',
+		'profileId',
+		'workerType',
+		'model',
+		'agentVersion',
+		'mcpServers',
+		'skillRevisions',
+		'createdAt',
+	]);
+});