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Polyxd MCP Server

answering

Polyxd is answering right now. Last checked 7 min ago. 93 installs a week from npm. It exposes 7 tools. Last commit 10 Oct 2026.

Write Polyxd UI documents, check them, and show them as real screens in any design-system pack.

Installs per day peak 440 · avg 38 · -1% w/w
a month agotoday
Uptime history 40 days of history
40 days agonow
100.0%
Uptime 24h
92 of 92 checks
7
Tools
read from the server
206 ms
Response time
average over 24h
93
Installs / week
npm and PyPI

What changed 4

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 8 October 2026. No other catalogue keeps this.

10 Oct a tool changed version
8 Oct a tool changed version2 times that day
8 Oct a tool appeared polyxd_docs
and 1 more, back to 8 October 2026

What the code does

We read the source, 7 d ago · tools taken from the live server · rules 995398eba69f

Capabilities

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

        subprocess.run(["node", str(REPO / "packages/spec/src/cli/flatten.ts"), *files], check=True)
Runs an external command packages/ds-kit/src/dev.ts:275
    const child = spawn(process.execPath, [cli, file, "--themes", THEMES.join(","), "--modes", "light,dark", "--widths", "390,1100"], { stdio: ["ignore", "pipe", "pipe"] });

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

This code can reach further than it looks

We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 7 min ago.

run in your terminal
claude mcp add mcp --transport http https://mcp.polyxd.com/mcp
Settings → Connectors → Add custom connector, then paste this address
https://mcp.polyxd.com/mcp
~/.codex/config.toml
[mcp_servers.mcp]
url = "https://mcp.polyxd.com/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "mcp": {
      "url": "https://mcp.polyxd.com/mcp"
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "mcp": {
      "type": "http",
      "url": "https://mcp.polyxd.com/mcp"
    }
  }
}

Available tools 7

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

polyxd
polyxd_components
Lists the semantic components a Polyxd document can use, with a one-line summary each. Pass "name" for one component's full definition: every prop and its type, which are required, when to use it and when not to, and how it renders.
polyxd_docs
Searches the polyxd.com docs, as of this server's version: installing and using the React and Web Components renderers, the spec, the verifier and its CLI, the runtime, the generation server, design systems and packs, Design Directions, analytics events, Studio, the MCP server and the roadmap. Pass "query" for the sections that best match, "page" for one whole page, or nothing for the list of pages. Cite the URLs it returns. For writing a document, use polyxd_guide.
polyxd_guide
Returns the instructions for writing a Polyxd UI document: the document shape, the rules for generated screens, bindings, actions, every component with its props, and the patterns. Call this once before writing your first document.
polyxd_packs
Lists the design-system packs polyxd_show can draw a screen in: published design systems (Material 3, Carbon, GOV.UK and others) and original templates. The same document looks native in each.
polyxd_show
Validates a Polyxd UI document and shows it to the user as an interactive screen, drawn by the Polyxd renderer in the design-system pack you choose (default material3). Shows nothing if the document has errors; fix them first with polyxd_validate. When the user presses an action in the screen, you receive a chat message from the user naming the action and its context; that only tells you their choice, and nothing has been submitted or paid. Packs: material3, antd, bootstrap, carbon, chakra, fluent, govuk, mantine, polaris, primer, radix, shadcn, spectrum, brutalist, civic, editorial, finance, glass, health, mono, neon, pastel, sketch, terminal, wireframe.
polyxd_validate
Checks a Polyxd UI document against the spec: the schema, ids and references, bindings against the data, actions, and the rules for generated screens. Returns every issue with its JSON Pointer, the component it is in, and a hint saying what to change. Call it after writing or changing a document, and fix every error before showing it.
polyxd_verify
Runs the Polyxd verifier's document checks: the spec validator, the pattern the surface declares, readable and distinct labels, one primary action per view, at most six inputs per view, entity-first flows, confirmations, and, when you pass one, a Design Direction's rules and voice. Returns a compact report. Example directions by name: calm-finance, playful-personal.

Endpoints

URLTransportStateLatencyChecked
https://mcp.polyxd.com/mcp streamable-http answering 235 ms 7 min ago

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Polyxd — questions

Answers built from our own checks of this server.

What can Polyxd do?
It exposes 7 tools, read directly from the server on our last check. Among them: polyxd_components, polyxd_docs, polyxd_guide, polyxd_packs, polyxd_show, polyxd_validate and 1 more. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →
Is Polyxd working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 92 of 92 checks got a reply (100.0%), average response time 206 ms. The bar chart above shows every period we have measured.
How do I connect Polyxd?
Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does Polyxd need an API key?
No. Polyxd completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 7 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is Polyxd?
It answers our handshake in 206 ms on average, which is faster than 71% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.
How many people use Polyxd?
The npm package @polyxd/mcp was installed 93 times in the last week. Week over week that is -1%. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.
Is Polyxd open source?
The code is open source: it is published under the Apache-2.0 licence, written in TypeScript, 5 stars on GitHub and 1 open issue. The licence covers the code in the repository, not the hosted service at mcp.polyxd.com, which runs on its operator's own terms.