c2n Web Components

Name: c2n Web Components
Author: code2nguyen

by code2nguyenversion 1.0.21i★ –iRuns on your computer

Registry nameio.github.code2nguyen/c2n

Install

Overview

Description from the maker (original English)

Exact APIs, examples, theme tokens and markup validation for the c2n (c2-*) Lit web components.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Other

Install

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

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
You fill in yourself: C2N_PROJECT_ROOT

You need

npmNode.js installed (for the npx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "c2n": {
      "command": "npx",
      "args": [
        "-y",
        "@c2n/mcp"
      ],
      "env": {
        "C2N_PROJECT_ROOT": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add c2n --env C2N_PROJECT_ROOT=your-value -- npx -y @c2n/mcp

Fill in the empty values before running it.

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "c2n": {
      "command": "npx",
      "args": [
        "-y",
        "@c2n/mcp"
      ],
      "env": {
        "C2N_PROJECT_ROOT": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "c2n": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@c2n/mcp"
      ],
      "env": {
        "C2N_PROJECT_ROOT": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

Values you fill in

C2N_PROJECT_ROOT env
Project whose installed @c2n/* packages the server reports. Defaults to the working directory.

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

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 6, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account code2nguyen, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– 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

Compared with others in Otheri

More stars than 0% of the other 32433 servers in this category
Published to the registry more recently than 95% of the other 32433 servers in this category
Basic checks equal to or better than 100% of the other 32433 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 c2n Web Components safe?

It passed 1 of 1 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 –, and the latest version (1.0.21) reached the registry yesterday.

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: Spec Driven Development, Remote Desktop Commander, Symantec Cloud DLP AIops

Alternatives

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

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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.

@c2n/mcp

Model Context Protocol server that exposes the c2n web components to AI agents: component APIs (attributes, slots, events, native CSS parts, CSS variables with their theme tokens), usage and gallery examples, curated presets, the @c2n/theme tokens, variant code generation and the application workflow guides. Everything is bundled in data/registry.json, so it works offline in any project.

Use

The server uses stdio and can be launched by any MCP host:

npx -y @c2n/mcp

Claude Code project .mcp.json:

{ "mcpServers": { "c2n": { "type": "stdio", "command": "npx", "args": ["-y", "@c2n/mcp"] } } }

Codex project .codex/config.toml:

[mcp_servers.c2n]

command = "npx" args = ["-y", "@c2n/mcp"]

Google Antigravity project .agents/mcp_config.json uses the same mcpServers command/args structure as the Claude example. The @c2n/skill package can install the skill and merge these configurations automatically.

Run the server from a project directory: it reports which @c2n/* packages are installed and serves the bundled API when the installed version differs. The registry is packaged locally, so tool calls do not require network access after installation.

Use c2n-mcp --version to inspect the installed server version and c2n-mcp --help for CLI usage.

The MCP server supplies structured component facts; it does not install component packages or edit an application by itself. Pair it with @c2n/skill when you also want the agent to follow c2n's application, theming and variant conventions. See the AI tools guide for the complete setup and example prompts.

Verify the connection

Restart the agent after adding its MCP configuration, then ask it to use the c2n MCP server to list components or inspect c2-button. A connected client should expose the tools below and report @c2n/* packages installed in the current project. If the server cannot start, run npx -y @c2n/mcp --version in that project to distinguish an npm/runtime problem from an MCP client configuration problem.

Tools

Tool	Purpose
`list_components`	Every component with tag, package, category, description, installed version
`search_components`	Free-text search across names, descriptions, attributes, slots, events, examples, icons
`get_component`	Full API of one component, CSS variables grouped by part/state with their theme token
`get_examples`	Usage rows and gallery cards; `view: "index"` lists every look (summary, screenshot)
`search_examples`	Find a look across every component's gallery ("glass", "pill", "underline")
`get_presets`	Curated presets as CSS variable values
`get_theme`	The `--c2-theme--*` tokens, install/mapping snippets; per-component mapping with `tag`
`generate_variant`	CSS class / HTML + style / Lit subclass / JSON from overrides, a preset or a gallery card
`validate_markup`	Checks markup/CSS you wrote: native controls to replace, unknown tags/attributes/slots/events/variables
`get_workflow_guide`	`workflow`, `theming`, `variant-components`, `frameworks`

Gallery cards are served with a generated summary of what they change and CSS whose colours follow the --c2-theme--* tokens wherever a literal equals a token's value (var(--c2-theme--color-outline, #d4d4d8)), so a copied card follows the application's theme and dark mode. Each card also links light and dark PNG captures hosted with the docs site (gallery-shots/ / . .png, written by apps/ui/scripts/gallery-shots.mjs in the Pages deploy).

Validate from the command line

validate_markup is also a CLI, for CI and editor hooks. It reads HTML, JSX/TSX, Vue, Svelte, Astro, Angular and Lit templates and CSS, and checks them against the API of the @c2n/* packages the project has installed:

npx -y @c2n/mcp validate src            # exit 1 on errors

npx -y @c2n/mcp validate src --strict # warnings fail too (native controls, box styling on a c2 host) npx -y @c2n/mcp validate --hook # Claude Code PostToolUse hook: reads the payload on stdin

It reports native / / / / / / elements that a c2-* element replaces, unknown c2-* tags, attributes, slots and --c2-* variables (with "did you mean"), events a c2-* element does not fire (with its event list), a static camelCase attribute the element ignores (rowKey for row-key), and box styling on a c2-* host (border, padding, background, box-shadow, outline; a radius alone is fine). A line holding c2n-ignore, or the line after a comment holding it, is skipped. In hook mode the findings go to stderr with exit code 2, which Claude Code hands back to the agent; npx -y @c2n/skill install registers that hook in .claude/settings.json.

Resources: c2n://components, c2n://components/{tag}, c2n://theme, c2n://guide/{topic}.

Development

data/registry.json is an ignored build artifact. npm run build:tools (repo root) regenerates it from the component manifests, docs content, presets and theme, then compiles dist/ and refreshes the committed skill fallback.
dev, inspect, smoke and npm pack automatically build the registry when needed.
npm run smoke -w packages/tools/mcp spawns the server over stdio and checks every tool.
npm run inspect -w packages/tools/mcp opens the MCP Inspector against the source entry (node src/cli.ts, Node 24 type stripping).

c2n Web Components

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

Values you fill in

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

Compared with others in Otheri

Common questions

Alternatives

Spec Driven Development

Remote Desktop Commander

Symantec Cloud DLP AIops

README from the maker

@c2n/mcp

Use

Verify the connection

Tools

Validate from the command line

Development