llms.txt

llms.txt

llms.txt is a proposed standard for helping large language models understand your website. Similar to robots.txt, it’s a plain text file at yourdomain.com/llms.txt that describes what your site is and what’s on it — structured as markdown so LLMs can easily parse and reason about it.

Yamblog generates the blog section of your llms.txt. You compose the full file — the package owns the blog-specific part, you own the rest.

Generate the blog section

const section = await blog.generateLlmsTxt();

By default, only posts with featured: true in their frontmatter are included.

Options

Option	Type	Default	Description
sectionTitle	string	'Blog'	The ## heading for the section
siteUrl	string	from config	Override the base URL
filter	(post: Post) => boolean	p => p.featured	Which posts to include

Filtering examples

// All posts
await blog.generateLlmsTxt({ filter: () => true });

// Posts tagged 'ai'
await blog.generateLlmsTxt({ filter: p => p.tags.includes('ai') });

// Posts in a specific category
await blog.generateLlmsTxt({ filter: p => p.category === 'tutorials' });

Compose the full file

Yamblog generates the blog section. You write the rest — it’s a template string:

const section = await blog.generateLlmsTxt();

const llmsTxt = `# Acme Corp

> We help developers ship software faster.

We build tools for modern engineering teams. Our blog covers TypeScript, AI, and developer experience.

${section}

## Docs

- [Getting Started](https://acme.com/docs/getting-started): Set up your first project.
- [API Reference](https://acme.com/docs/api): Full API documentation.
`;

The full spec for the format is at llmstxt.org. The required fields are a # Name heading and an > blockquote description — everything else is optional.

Serve it

Next.js (App Router)

Create app/llms.txt/route.ts:

import { blog } from '@/lib/blog';

export async function GET() {
  const section = await blog.generateLlmsTxt();
  const body = `# My Site\n\n> Short description of what this site is.\n\n${section}`;
  return new Response(body, {
    headers: { 'Content-Type': 'text/plain; charset=utf-8' },
  });
}

The file is served at yourdomain.com/llms.txt automatically.

Astro

Create src/pages/llms.txt.ts:

import type { APIRoute } from 'astro';
import { blog } from '../lib/blog';

export const GET: APIRoute = async () => {
  const section = await blog.generateLlmsTxt();
  const body = `# My Site\n\n> Short description of what this site is.\n\n${section}`;
  return new Response(body, {
    headers: { 'Content-Type': 'text/plain; charset=utf-8' },
  });
};

The file is served at yourdomain.com/llms.txt automatically.