llms txt

How llms.txt fits your setup

generateLlmsTxt(config, options) (root export of @rebilder/gateway) produces spec-shaped markdown (H1 site name, blockquote description, H2 sections of link lists) deterministically, with injected values only, no LLM anywhere. Same input → same output, which is why it’s safe to cache hard.

If config.sources.catalog enumerates for new URL(options.baseUrl), a ## Products section (title, URL, price note) is generated automatically. Likewise config.sources.policies → ## Policies.
Sources may return null or throw for the base URL; both are tolerated as "nothing to list". A malformed price omits its note rather than breaking the file or emitting a wrong value.
options.sections appends manual sections after the auto-generated ones, in order. Sections with no links are omitted.

Option	Type	Notes
`baseUrl`	`string`	The store’s canonical base URL. Catalog/policy sources are called with `new URL(baseUrl)` to enumerate site-wide entries, so wire them to return the full list for the base URL if you want auto sections.
`siteName`	`string`	The H1. Injected verbatim.
`description`	`string`	One-line description, rendered as the blockquote. Injected verbatim.
`sections`	`LlmsTxtSection[]` (optional)	Manual sections: `{ title, links: [{ title, url, note? }] }`. Links render as `- [title](url): note`.

Next.js route helper

app/llms.txt/route.tsCopy

// app/llms.txt/route.ts
import { createLlmsTxtRouteHandler } from '@rebilder/gateway/next'
import { gatewayConfig } from '../../lib/gateway-config'

export const GET = createLlmsTxtRouteHandler(gatewayConfig, {
  baseUrl: 'https://store.example.com',
  siteName: 'Acme Outdoors',
  description: 'Trail footwear and gear, shipped from Bend, OR.',
  sections: [{ title: 'Guides', links: [{ title: 'Sizing guide', url: 'https://store.example.com/pages/sizing' }] }],
})

The route handler serves text/plain; charset=utf-8 with long shared-cache headers (public, max-age=300, s-maxage=3600, stale-while-revalidate=86400), which is safe because the output is deterministic. trymumm.com serves its own at /llms.txt.

On other stacks, call generateLlmsTxt(config, options) yourself and serve the string from any route with the same content type.