# Configuration > onto.config.ts — every field, the llms.txt it generates, and the JSON-LD page types. Source: https://docs.buildonto.dev/sdk/configuration Section: Serve SDK --- Configuration\[01\] ## Configuration `onto.config.ts` — written for you by `onto-next init`. It describes your site to agents: it becomes your `llms.txt`, and feeds the JSON-LD OntoProvider adds. ### Try it \[02\] Edit the config and watch the llms.txt it builds: namesummarybaseUrl routes \+ route onto.config.ts import type { OntoConfig } from '@ontosdk/next/config'; const config: OntoConfig = { name: 'Acme', summary: 'Payment infrastructure for the internet.', baseUrl: 'https://acme.com', routes: \[ { path: '/', description: 'Homepage and product overview' }, { path: '/pricing', description: 'Plans and what each includes' }, { path: '/docs', description: 'Developer documentation' }, \], externalLinks: \[{ title: 'Status', url: 'https://status.acme.com' }\], sections: \[{ heading: 'Contact', content: 'support@acme.com' }\], }; export default config; /llms.txt \# Acme > Payment infrastructure for the internet. ### Key Routes - \[/\](https://acme.com/): Homepage and product overview - \[/pricing\](https://acme.com/pricing): Plans and what each includes - \[/docs\](https://acme.com/docs): Developer documentation ### Resources - \[Status\](https://status.acme.com) ### Contact support@acme.com ### Every field \[03\] FieldTypeBecomes `name`string · requiredThe llms.txt title, and the AboutPage name `summary`string · requiredThe llms.txt quote under the title, and the AboutPage description `baseUrl`string · requiredThe prefix for every route link. The build warns while it's still example.com `routes`{ path, description, pageType? }\[\]The Key Routes list, and which pages get JSON-LD `externalLinks`{ title, url, description? }\[\]A Resources list `sections`{ heading, content }\[\]Extra sections, each under its own heading `organization`{ name, description?, url?, logo?, foundingDate? }The Organization inside the About page's JSON-LD Nothing has a default: leave a list out and its section is left out. ### Where it's read \[04\] Read byHowWatch for Build CLIImports it to write `public/llms.txt`If the import fails it falls back to a simpler read that keeps only name, summary, baseUrl and route paths and descriptions MiddlewareOnly what you pass as `ontoMiddleware(req, config)`Serves a fresh `/llms.txt` to agents, `?onto` and Markdown requests; the scaffolded middleware already passes it OntoProviderOnly the `config` propUses routes' pageType and organization for JSON-LD **Don't delete it.** The scaffolded `middleware.ts` imports `./onto.config`, so removing the file breaks the build. ### Page types \[05\] pageTypeOntoProvider adds `about`An `AboutPage`, with your `organization` inside it `scoring`A fixed `HowTo` describing Onto's own scoring method — only meaningful on an Onto site `default`Nothing. Also what you get when pageType is left out Routes match by exact path — `/blog/*` never matches. There's no way to supply your own JSON-LD through the config; for that, write the `