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Conversion components built on A/B tested mechanics — served to your coding agent

Coding agents write beautiful pages that do not sell. They ship a hero, a feature grid and a single "Add to cart" button, because that is what a general-purpose component library contains. Nothing in it decides where an upsell goes, when a free-shipping bar should appear, or whether the price belongs inside the button.

uxgen is the missing layer: an MCP server that carries the commerce mechanics — and the rules that place them.

Status, plainly

Read this before anything else, because it decides whether uxgen is useful to you today.

• Live now. The remote endpoint, OAuth sign-in, account creation, and tool discovery. Connect and the nine tools appear in your client.
• Not live yet. Tool execution. Every call returns an explicit refusal rather than a fabricated result — a deliberate choice, so your agent never builds a page on top of an answer that was invented.
• No free trial. uxgen is a paid service, billed from day one. An account without an active subscription gets the tool list and nothing else.

The listing below describes what the server is being built to do. It is not a description of what a call returns this week. When execution opens, this section changes first.

What it carries

Conversion mechanics, not generic UI. 65 pieces: bundle and quantity tiers, cart drawer with the upsell inside it, free-shipping progress bar with real thresholds, in-cart and post-purchase upsells, add-on rails, delivery-date blocks, scratch-to-reveal and tear-off promo codes, subscription toggles, a photo captcha that trades a code for a look at the product instead of an email address. Five families: offer and tiers, cart and upsell, subscription and renewal, what is inside, delivery and returns.

The mechanics behind them have been A/B tested in real stores. We have not A/B tested these components ourselves, and we say so on the site rather than let you assume otherwise. What we test is different, and it is below.

Placement rules. A block on its own is worth little. Where an upsell goes on a product page, above or below the button, at which moment, with which wording. What a free-shipping threshold has to say to move a cart. Why a tier rail converts when the middle option looks obvious and stops converting when it does not. Your agent knows how to write a component; it does not know where to put it.

Product photography. Nano Banana Pro, called by the agent while it builds: one photograph becomes several angles, a shot in the hand, a macro of the material. Background removal included, so a cutout can break out of its frame instead of sitting in a grey rectangle. This is the part no component library can give you, and the reason most generated stores look alike — with no material to build around, the model reaches for a gradient.

A bench, not a style guide. The design rules come from a measured panel of real pages, with bootstrap resampling and Benjamini-Hochberg correction, and the catalogue publishes its own refuted rules alongside the ones that held. That is the part that keeps moving: the corpus grows, rules get retired, new ones get posted. A copy inherits today's answers, not the machine that produces tomorrow's.

Measurement that names the gap. Contrast as a ratio, a touch target in pixels, a truncated line in characters — each with the gesture that closes it. Never a score out of a hundred to optimise against.

Connect

Remote server over Streamable HTTP, OAuth. Nothing to install, no key to paste into a config file.

claude mcp add uxgen --transport http https://www.uxgen.ai/mcp

Your client opens a browser window to sign in on first use. Works with Claude Code, Cursor, VS Code, Codex and any MCP-compatible client. Discovery — initialize and tools/list — is open without a token, so you can inspect the tool surface before creating an account.

Who it is for

Anyone whose agent builds storefronts: Shopify themes, headless commerce, custom Next.js shops, landing pages that have to convert. The buyer is a merchant or a developer; the one that picks the tool is usually their agent.

Pricing

$29 / month, with an image allowance included. No free trial — billed from day one. Details at https://www.uxgen.ai