Unofficial MCP Server for USWDS

Name: Unofficial MCP Server for USWDS
Author: bibekpdl

by bibekpdlversion 0.2.1i★ 2iRuns on your computer

Registry nameio.github.bibekpdl/uswds-mcp

How to install

What it does

Unofficial USWDS MCP: official markup, class-aware validator, and page composer for AI tools.

Connects Runs on your computer
Account or key No key needed
Category Other

Install

Pick the AI app you use, then copy the settings.

Passed 3/3 checks · Runs on your computer · ✓ Commands checked Nov 14, 2026

First: which AI do you use?

ClaudeWeb · app · phoneChatGPTWebClaude CodeTerminalCursorCode editorVS CodeCode editorOtherOther apps

Pick your app and the steps appear below.

Works with Claude, with some setup first

Install Node.js on your computer first (one time) · Only the Claude desktop app (Windows or Mac), not the web or phone

Let AI install it

Copy this message into a Claude chat. The AI checks your computer, tells you which file it will change, and waits for your OK every time.

Please install the MCP server Unofficial MCP Server for USWDS for Claude on this computer, in this order: 1) Check Node.js with node -v. If it is missing, tell me to install it from https://nodejs.org/en/download; do not install it yourself. 2) Use only this config (already checked by PopNx MCP): { "mcpServers": { "uswds": { "command": "npx", "args": [ "-y", "uswds-mcp" ] } } } 3) Tell me the full path of the file you will change, or the command you will run, and wait for my OK. 4) No key is needed. 5) Do what we agreed, then check that the Unofficial MCP Server for USWDS tools really show up.

This message has no key in it. If a key is needed, the AI will ask you to paste it yourself into the file or the app’s field.

1
Install Node.js (if you don’t have it)
Already installed? Check first · Open Terminal, type this command and press Enter
node -v
- A version number such as v26.13.1 = installed, skip this step
- "command not found" (on Windows: "is not recognized") = not installed yet, or installed but Terminal needs to be closed and reopened
How to open Terminal
Mac: press ⌘ + Space, type Terminal, press Enter
Windows: open Start, type Windows PowerShell, then Open
Not installed: Open the official download page, pick the LTS version and the click-through installer: .pkg on Mac · .msi on Windows. Double-click and follow it to the end. No curl command needed
Open the Node.js download page ↗
When it’s done, close Terminal, open it again and run the same command. You should see a version number: node -v
Install once; it works for everything that needs Node.js
Done
Open the Claude desktop app’s settings file
SettingsDeveloperEdit Config
Done

Paste these settings and save the file

{
  "mcpServers": {
    "uswds": {
      "command": "npx",
      "args": [
        "-y",
        "uswds-mcp"
      ]
    }
  }
}

Done

Quit Claude and open it again
Done
Try it
Use Unofficial MCP Server for USWDS and tell me what you can do for me, then show me one thing
✓ If Claude says it is using Unofficial MCP Server for USWDS or shows a Unofficial MCP Server for USWDS tool in the answer, you are connected

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

ChatGPT cannot connect Unofficial MCP Server for USWDS yet

Unofficial MCP Server for USWDS runs on your computer, but ChatGPT can only connect servers that run on the web

What you can do instead

A · Use an app that can connect Unofficial MCP Server for USWDS

Steps for Claude →Install Node.js on your computer first (one time) · Only the Claude desktop app (Windows or Mac), not the web or phone
Steps for Claude Code →Install Node.js on your computer first (one time)
Steps for Cursor →Install Node.js on your computer first (one time)
Steps for VS Code →Install Node.js on your computer first (one time)

B · Others in Other that work with ChatGPT

Picked from the most used in the same category, only ones that connect by address with no key

Hostinger✓ ChatGPT
World Monitor✓ ChatGPT
Svelte MCP✓ ChatGPT

Works with Claude Code, with some setup first

Install Node.js on your computer first (one time)

Let AI install it

Copy this message into a Claude Code chat. The AI checks your computer, tells you which file it will change, and waits for your OK every time.

Please install the MCP server Unofficial MCP Server for USWDS for Claude Code on this computer, in this order: 1) Check Node.js with node -v. If it is missing, tell me to install it from https://nodejs.org/en/download; do not install it yourself. 2) Use only this config (already checked by PopNx MCP): claude mcp add --scope user uswds -- npx -y uswds-mcp 3) Tell me the full path of the file you will change, or the command you will run, and wait for my OK. 4) No key is needed. 5) Do what we agreed, then check that the Unofficial MCP Server for USWDS tools really show up.

This message has no key in it. If a key is needed, the AI will ask you to paste it yourself into the file or the app’s field.

1
Install Node.js (if you don’t have it)
Already installed? Check first · Open Terminal, type this command and press Enter
node -v
- A version number such as v26.13.1 = installed, skip this step
- "command not found" (on Windows: "is not recognized") = not installed yet, or installed but Terminal needs to be closed and reopened
How to open Terminal
Mac: press ⌘ + Space, type Terminal, press Enter
Windows: open Start, type Windows PowerShell, then Open
Not installed: Open the official download page, pick the LTS version and the click-through installer: .pkg on Mac · .msi on Windows. Double-click and follow it to the end. No curl command needed
Open the Node.js download page ↗
When it’s done, close Terminal, open it again and run the same command. You should see a version number: node -v
Install once; it works for everything that needs Node.js
Done
Open Terminal
Mac: press Command+Space and type Terminal · Windows: open PowerShell
Done

Paste this command and press Enter

claude mcp add --scope user uswds -- npx -y uswds-mcp

Done

Type /mcp in Claude Code
You should see Unofficial MCP Server for USWDS listed as connected
Done
Try it
Use Unofficial MCP Server for USWDS and tell me what you can do for me, then show me one thing
✓ If Claude Code says it is using Unofficial MCP Server for USWDS or shows a Unofficial MCP Server for USWDS tool in the answer, you are connected

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with Cursor, with some setup first

Install Node.js on your computer first (one time)

Let AI install it

Copy this message into a Cursor chat. The AI checks your computer, tells you which file it will change, and waits for your OK every time.

Please install the MCP server Unofficial MCP Server for USWDS for Cursor on this computer, in this order: 1) Check Node.js with node -v. If it is missing, tell me to install it from https://nodejs.org/en/download; do not install it yourself. 2) Use only this config (already checked by PopNx MCP): { "mcpServers": { "uswds": { "command": "npx", "args": [ "-y", "uswds-mcp" ] } } } 3) Tell me the full path of the file you will change, or the command you will run, and wait for my OK. 4) No key is needed. 5) Do what we agreed, then check that the Unofficial MCP Server for USWDS tools really show up.

This message has no key in it. If a key is needed, the AI will ask you to paste it yourself into the file or the app’s field.

1
Install Node.js (if you don’t have it)
Already installed? Check first · Open Terminal, type this command and press Enter
node -v
- A version number such as v26.13.1 = installed, skip this step
- "command not found" (on Windows: "is not recognized") = not installed yet, or installed but Terminal needs to be closed and reopened
How to open Terminal
Mac: press ⌘ + Space, type Terminal, press Enter
Windows: open Start, type Windows PowerShell, then Open
Not installed: Open the official download page, pick the LTS version and the click-through installer: .pkg on Mac · .msi on Windows. Double-click and follow it to the end. No curl command needed
Open the Node.js download page ↗
When it’s done, close Terminal, open it again and run the same command. You should see a version number: node -v
Install once; it works for everything that needs Node.js
Done
Click this button to open Cursor
Open in Cursor
Cursor asks you to confirm; click Install
Done
Open the AI chat in Cursor in Agent mode
Done
Try it
Use Unofficial MCP Server for USWDS and tell me what you can do for me, then show me one thing
✓ If Cursor says it is using Unofficial MCP Server for USWDS or shows a Unofficial MCP Server for USWDS tool in the answer, you are connected

Menu names checked against Cursor’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with VS Code, with some setup first

Install Node.js on your computer first (one time)

Let AI install it

Copy this message into a VS Code chat. The AI checks your computer, tells you which file it will change, and waits for your OK every time.

Please install the MCP server Unofficial MCP Server for USWDS for VS Code on this computer, in this order: 1) Check Node.js with node -v. If it is missing, tell me to install it from https://nodejs.org/en/download; do not install it yourself. 2) Use only this config (already checked by PopNx MCP): { "servers": { "uswds": { "type": "stdio", "command": "npx", "args": [ "-y", "uswds-mcp" ] } } } 3) Tell me the full path of the file you will change, or the command you will run, and wait for my OK. 4) No key is needed. 5) Do what we agreed, then check that the Unofficial MCP Server for USWDS tools really show up.

This message has no key in it. If a key is needed, the AI will ask you to paste it yourself into the file or the app’s field.

1
Install Node.js (if you don’t have it)
Already installed? Check first · Open Terminal, type this command and press Enter
node -v
- A version number such as v26.13.1 = installed, skip this step
- "command not found" (on Windows: "is not recognized") = not installed yet, or installed but Terminal needs to be closed and reopened
How to open Terminal
Mac: press ⌘ + Space, type Terminal, press Enter
Windows: open Start, type Windows PowerShell, then Open
Not installed: Open the official download page, pick the LTS version and the click-through installer: .pkg on Mac · .msi on Windows. Double-click and follow it to the end. No curl command needed
Open the Node.js download page ↗
When it’s done, close Terminal, open it again and run the same command. You should see a version number: node -v
Install once; it works for everything that needs Node.js
Done
Click this button to open VS Code
Open in VS Code
VS Code asks you to confirm; click Install
Done
Open the AI chat in VS Code in Agent mode
Done
Try it
Use Unofficial MCP Server for USWDS and tell me what you can do for me, then show me one thing
✓ If VS Code says it is using Unofficial MCP Server for USWDS or shows a Unofficial MCP Server for USWDS tool in the answer, you are connected

Menu names checked against VS Code’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Other apps that use MCP, such as Windsurf, Zed or Gemini CLI, each add servers differently. See how in the app list.

See every app that uses MCP →

JSON settings are under “For developers” below

Stuck? Ask people who use Unofficial MCP Server for USWDS💬 Discussion →

For developers: Terminal commands and JSON settings

Installed on your computer

Claude Code

claude mcp add --scope user uswds -- npx -y uswds-mcp

Claude Desktop (claude_desktop_config.json)

{
  "mcpServers": {
    "uswds": {
      "command": "npx",
      "args": [
        "-y",
        "uswds-mcp"
      ]
    }
  }
}

Cursor (~/.cursor/mcp.json)

{
  "mcpServers": {
    "uswds": {
      "command": "npx",
      "args": [
        "-y",
        "uswds-mcp"
      ]
    }
  }
}

VS Code (mcp.json)

{
  "servers": {
    "uswds": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "uswds-mcp"
      ]
    }
  }
}

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

At a glance

GitHub stars i: 2
Downloads per weeki: 70/wk
Licence i: MIT
Connection: Runs on your computer
Transport: stdio
Latest versioni: 0.2.1
Categoryi: Other
Published to registryi: Oct 25, 2026
Code last changedi: Nov 8, 2026
Maker: bibekpdl
Packages: npm: uswds-mcp
Repo: bibekpdl/uswds-mcp
Registry status: Active

Which apps can use it

Based on how this server connects and on each app’s own docs, checked Nov 10, 2026.

Run on your computer in

Claude Goose LM Studio Msty Studio Cherry Studio Cursor VS Code + GitHub Copilot Visual Studio Windsurf (Devin Desktop)Zed Kiro Cline Continue JetBrains AI Assistant Claude Code Codex CLI Gemini CLI OpenCode nodecode Warp LibreChat Raycast

All apps, with pros and cons →

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 15, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account bibekpdl, which owns the repo
✓ Pass
Still maintained
Code last changed 7 days ago
✓ Pass
Has a licence
Uses MIT
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Discussion

Ask, share a tip or report that it does not work. Sorted by what people marked helpful.

No posts yet. Be the first to ask or share.

Posts here are written by users, not the PopNx team.

User reviews

No reviews yet

Compared with others in Otheri

More stars than 91% of the other 19819 servers in this category
Published to the registry more recently than 67% of the other 19819 servers in this category
Basic checks equal to or better than 100% of the other 19819 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Unofficial MCP Server for USWDS safe?

It passed 3 of 3 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed 7 days ago, and the latest version (0.2.1) reached the registry 21 days ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: World Monitor, openstatus, Oh My Posh Validator, Strata, Jitsu

Similar alternatives

Same category, other makers, commands already checked. Official ones first, then by stars.

Reading a card:↓ Downloads per weeki★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

World Monitor

Real-time global intelligence on conflict, markets, energy, trade, shipping and cyber. 97 tools.

by koala73Widely used★ 90.6KUpdated yesterday

Runs in the cloud✓ service owner · worldmonitor.app

How to connect

openstatus

Manage monitors, status pages, incidents and maintenances in your openstatus workspace.

by openstatusHQWidely used★ 9.3KUpdated 2 months ago

Runs in the cloud✓ service owner · openstatus.dev

How to connect

Oh My Posh Validator

Validate oh-my-posh configurations and segment snippets against the official schema.

by JanDeDobbeleerWidely used★ 23.8K Stars for the whole repoUpdated 26 days ago

Runs in the cloud✓ service owner · ohmyposh.dev

How to connect

Strata

MCP server for progressive tool usage at any scale (see https://klavis.ai)

by Klavis-AIGrowing★ 5.8KUpdated 14 months ago

Runs in the cloudRepo archived✓ klavis.ai

How to connect

Jitsu

Manage Jitsu data pipelines: destinations, streams, connections, functions, live events.

by jitsucomWidely used★ 5.1KUpdated 4 months ago

Runs in the cloud✓ service owner · jitsu.com

How to connect

World Monitor — Runs in the cloud, nothing to install · No key needed
openstatus — Runs in the cloud, nothing to install · No key needed
Oh My Posh Validator — Runs in the cloud, nothing to install · No key needed
Strata — Runs in the cloud, nothing to install · No key needed
Jitsu — Runs in the cloud, nothing to install · No key needed

README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

uswds-mcp

Make AI-generated government UI actually USWDS-compliant.

An MCP server that gives Claude, Cursor, Copilot, Windsurf and any other MCP client the official [U.S. Web Design System](https://designsystem.digital.gov/) markup, a validator that knows every real USWDS class, and a page composer that outputs accessible, validated pages.

Unofficial and independent. Not affiliated with, endorsed by, or maintained by GSA, TTS, or the official USWDS team. See NOTICE.md.

The problem

LLMs write USWDS from memory. They invent usa-btn, forget the usa-overlay that makes the mobile menu work, put usa-card markup without its container, and wire up accordions to nothing. The result *looks* plausible and is subtly broken.

uswds-mcp closes that loop:

recommend_uswds_structure  →  get_component_markup  →  compose_uswds_page  →  validate_uswds_markup

(what to use) (official HTML) (accessible page) (fix until 0 errors)

Without	With uswds-mcp
Class names recalled from memory	Official HTML rendered from the `@uswds/uswds` templates (178 snippets, ~70 components and page templates, every variant)
"Looks right"	Validator rejects any `usa-*` class that is not in the USWDS stylesheet, with a did-you-mean
Missing structure goes unnoticed	BEM, required children, ARIA wiring, form control structure, header overlay, scripts, heading order, duplicate ids, link/image/button names
Stock template output	`compose_uswds_page` builds pages from your real sections; zero axe-core violations in CI

What a validator finding looks like

"severity": "error", "rule": "unknown-class", "message": "\"usa-alrt\" is not a class defined by USWDS.", "selector": "div.usa-alrt", "snippet": " ", "suggestion": "Did you mean \"usa-alert\"?" }

Findings carry the offending element, a fix suggestion, the component to look up, and a docs link, so the model can repair its own output.

Quick start

npx -y uswds-mcp

Add it to your MCP client:

"mcpServers": { "uswds": { "command": "npx", "args": ["-y", "uswds-mcp"] } } }

Claude Code: claude mcp add uswds -- npx -y uswds-mcp

Setup for Claude Desktop, Cursor, VS Code, Windsurf and others: docs/CLIENTS.md. Ready-made configs are in examples/.

No network, API key, or ingest step needed: the data ships in the package.

Tools

Tool	Use
`get_component_markup`	Official HTML for a component/page template and its variants (`accordion`, `footer` + `slim`, `sign-in`, ...). Understands everyday names (`dropdown` → select).
`compose_uswds_page`	Build a full page from structured sections: hero, content, alert, summary box, cards, process list, step indicator, accordion, table, form, contact.
`validate_uswds_markup`	Validate fragments or full pages: real class names, component structure, forms, ARIA, accessibility basics.
`find_uswds_classes`	Look up real classes, including utilities and responsive variants (`margin top 2`, `tablet grid col 6`).
`generate_uswds_page`	Quick start from free-text requirements; returns an editable section spec, bracketed placeholders, and its own validation.
`recommend_uswds_structure`	USWDS-first structure for a service or page.
`search_uswds`	Search docs, accessibility and usage guidance (with synonym expansion).
`get_component` / `get_pattern` / `get_template`	Structured guidance, plus the canonical markup for components.
`get_uswds_integration_recipe`	Framework setup for Next.js, Vite/React, static HTML, Rails, Drupal.
`validate_uswds_project_setup`	Catch wrong CSS import paths, missing scripts, CDN use, copied `dist`, global CSS risk.

All tools are read-only. See docs/TOOLS.md for arguments and recommended sequences.

Resources: uswds://component/{slug}, uswds://pattern/{slug}, uswds://template/{slug}, uswds://token/{category}, uswds://package/{name} Prompts: build_agency_website, build_service_page, audit_uswds_page, convert_page_to_uswds, integrate_uswds_in_project

Example

*"Build a page where residents renew a fishing permit: eligibility, fees table, steps, FAQ, contact."*

The model calls compose_uswds_page and gets back a complete page with banner, skipnav, header (with usa-overlay), breadcrumbs, summary box, striped table with caption and scoped headers, process list, accordion, contact details, slim footer and identifier, plus a list of the placeholders that still need real content, and a validation result.

Prefer to see it first? Run the scorecard:

npm run eval

scenario                        unknown classes  errors  warnings  axe violations

'Apply for housing assistance' 0 0 0 0 'Renew a fishing permit' 0 0 0 0 ...

Does it help?

In a small test (5 tasks, same model, with and without the server) pages built with uswds-mcp had 0 validator errors on 5 of 5 pages, versus 1 of 5 without it. The model did not invent class names in either case; what it missed without the tools was structure, such as the header overlay that makes the mobile menu work, banner internals, and accordion button types. It is a small, single-run sample, so see the caveats and method in docs/COMPARISON.md.

How it works

Ingest (npm run ingest): renders every official @uswds/uswds twig template with its JSON fixtures into canonical HTML, extracts all class names from the official stylesheet, and indexes the official docs (uswds-site).
Validate against ground truth: the validator is tested against *every* official snippet (they must pass) and against a corpus of 30 typical LLM mistakes (they must be caught).
Stay current: docs and markup come from the same USWDS version (enforced by a test), and a monthly workflow re-ingests and opens a PR.

Current data: USWDS 3.14.0.

Limits

Static analysis. It cannot judge color contrast, reading order on rendered pages, or real screen-reader behavior. USWDS components do not by themselves make a site Section 508 compliant; keep testing with axe, keyboard and screen readers.
Custom (non-usa-) classes are allowed and not validated.
Upstream fixture text in angle brackets (e.g. ) is placeholder content.

Develop

npm install

npm test # unit, self-consistency over official markup, MCP end-to-end, axe-core npm run eval npm run ingest # refresh from upstream

See CONTRIBUTING.md and the CHANGELOG.

License

MIT. See NOTICE.md for USWDS attribution and the licensing notes for indexed USWDS material.

Unofficial MCP Server for USWDS

What it does

Install

Install Node.js (if you don’t have it)

Open the Claude desktop app’s settings file

Paste these settings and save the file

Quit Claude and open it again

Try it

What you can do instead

Install Node.js (if you don’t have it)

Open Terminal

Paste this command and press Enter

Type /mcp in Claude Code

Try it

Install Node.js (if you don’t have it)

Click this button to open Cursor

Open the AI chat in Cursor in Agent mode

Try it

Install Node.js (if you don’t have it)

Click this button to open VS Code

Open the AI chat in VS Code in Agent mode

Try it

Installed on your computer

At a glance

Which apps can use it

Related guides

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Discussion

User reviews

Compared with others in Otheri

Common questions

Similar alternatives

World Monitor

openstatus

Oh My Posh Validator

Strata

Jitsu

README from the maker

uswds-mcp

The problem

What a validator finding looks like

Quick start

Tools

Example

Does it help?

How it works

Limits

Develop

License