# AugustCn

> AugustCn is a set of eight UI primitives, box, stack, grid, text, surface, field, motion and token, that people and AI agents compose into interfaces.

## What it is
AugustCn is a set of eight UI primitives, box, stack, grid, text, surface, field, motion and token, that people and AI agents compose into interfaces.

## Key facts
- Eight primitives: box, stack, grid, text, surface, field, motion and token.
- Spacing, colour and states are decided once as tokens.
- Agents read the rules and tokens instead of your CSS.
- One composition renders in every renderer.
- Open source under MIT, free forever.

## Who it is for
Design system authors and teams building interfaces with AI agents

## When to use this

Use AugustCn when:

- An interface has to be composed from a small set of primitives that people and agents can both read.
- Spacing, colour and states must come from tokens instead of one-off CSS.
- One composition has to render across frameworks.

Do not use it for: Bespoke marketing pages that need pixel-level layout code.

An agent should start with `get_product_overview` from the MCP server, then call `get_page` for the page it needs.

## FAQ

### What is AugustCn?
AugustCn is a set of eight UI primitives, box, stack, grid, text, surface, field, motion and token, that people and AI agents compose into interfaces.

### How do AI agents use AugustCn?
Agents read the rules and tokens instead of your CSS, so they compose screens that match the design system.

### Does AugustCn work with my framework?
One composition works across renderers, so the same primitives and tokens render in any framework.

### How much does AugustCn cost?
AugustCn is open source under MIT and free forever.


## Pages
- Home: https://fs-lp-augustcn.vercel.app/
- About: https://fs-lp-augustcn.vercel.app/about
- Contact: https://fs-lp-augustcn.vercel.app/contact
- Privacy: https://fs-lp-augustcn.vercel.app/privacy
- API docs: https://fs-lp-augustcn.vercel.app/docs
- Deprecation policy: https://fs-lp-augustcn.vercel.app/deprecation-policy
- Sitemap: https://fs-lp-augustcn.vercel.app/sitemap.xml

## API
- Base URL: https://fs-lp-augustcn.vercel.app
- OpenAPI: https://fs-lp-augustcn.vercel.app/openapi.json
- API catalog: https://fs-lp-augustcn.vercel.app/.well-known/api-catalog
- GET /v1/health, /v1/overview, /v1/pages, /v1/pages/{page}
- Public, read-only, no authentication. Errors are JSON. Every response carries RateLimit headers.
- Versioned in the path. /v1 is current. Deprecated routes send Deprecation and Sunset headers.

## MCP
- Endpoint: https://fs-lp-augustcn.vercel.app/mcp (Streamable HTTP, no authentication)
- Manifest: https://fs-lp-augustcn.vercel.app/.well-known/mcp
- Server card: https://fs-lp-augustcn.vercel.app/.well-known/mcp/server-card.json
- Registry entry: https://fs-lp-augustcn.vercel.app/server.json
- Tools: get_product_overview, get_page, search_site

## Markdown
- Send `Accept: text/markdown` to any page for a Markdown response.