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PopNx MCPMCP servers for people who use AI · explained in plain words

Lumen

by nitishagarversion 0.3.0i★ –iRuns on your computer
Registry nameio.github.nitishagar/lumen

Install

Overview

Description from the maker (original English)

Deterministic SEO audits as MCP tools: 36-rule site audit, keywords, rank, CWV reports.

PopNx MCP’s three pillars

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

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: Marketing & social media
  • You need to fill in: LUMEN_PSI_KEY, LUMEN_CRUX_KEY, LUMEN_OPR_KEY

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: LUMEN_PSI_KEY, LUMEN_CRUX_KEY, LUMEN_OPR_KEY

Values marked secret are keys to your account. Never share them or paste them into a chat.

You need

  • npmNode.js installed (for the npx command)

Which app do you use?

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": {
    "lumen": {
      "command": "npx",
      "args": [
        "-y",
        "@lumen-seo/cli"
      ],
      "env": {
        "LUMEN_PSI_KEY": "your-value",
        "LUMEN_CRUX_KEY": "your-value",
        "LUMEN_OPR_KEY": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add lumen --env LUMEN_PSI_KEY=your-value --env LUMEN_CRUX_KEY=your-value --env LUMEN_OPR_KEY=your-value -- npx -y @lumen-seo/cli

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": {
    "lumen": {
      "command": "npx",
      "args": [
        "-y",
        "@lumen-seo/cli"
      ],
      "env": {
        "LUMEN_PSI_KEY": "your-value",
        "LUMEN_CRUX_KEY": "your-value",
        "LUMEN_OPR_KEY": "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": {
    "lumen": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@lumen-seo/cli"
      ],
      "env": {
        "LUMEN_PSI_KEY": "your-value",
        "LUMEN_CRUX_KEY": "your-value",
        "LUMEN_OPR_KEY": "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

  • LUMEN_PSI_KEY secret env
    Google PageSpeed Insights API key — enables the CWV lab leg of page reports. Optional; without it that leg reports not-configured.
  • LUMEN_CRUX_KEY secret env
    Chrome UX Report API key — enables field CWV data. Optional; without it that leg reports not-configured.
  • LUMEN_OPR_KEY secret env
    Open PageRank API key — enables the OPR authority signal. Optional; without it that signal reports not-configured.

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 nitishagar, 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 Marketing & social mediai

  • More stars than 0% of the other 2969 servers in this category
  • Published to the registry more recently than 43% of the other 2969 servers in this category
  • Basic checks equal to or better than 100% of the other 2969 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 Lumen 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?

You need to fill in: LUMEN_PSI_KEY, LUMEN_CRUX_KEY, LUMEN_OPR_KEY

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 (0.3.0) reached the registry 36 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: MCP YouTube Transcript, Google Analytics MCP, BibiGPT YouTube Video Summarizer

Alternatives

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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.

lumen

Lightweight, pluggable, MCP-first SEO toolkit — free services only, bring your own keys, provenance on every number.

Status: v0.2.x — first public release. The CLI, the five MCP tools, and the docs site are live; see CHANGELOG.md for what shipped and the docs for the full guides.

Why lumen

Most SEO tooling is a black box with a subscription. lumen is the opposite: a local-first, agent-first audit toolkit that runs on free data sources, never ships a number it can't attribute, and speaks MCP so your coding agent can run it for you.

  • Local site audits — bounded, robots-respecting crawler with 36 built-in rules, severity scoring, and CI-friendly exit codes (0 pass, 1 findings, 2 usage/abort).
  • Free-tier data providers — PageSpeed Insights, CrUX, Google Suggest, Wikipedia demand, OpenPageRank, Tranco, DuckDuckGo SERP. BYOK: keys are read from env vars by *name*, never stored or logged.
  • MCP-first — five tools (lumen_audit_site, lumen_page_report, lumen_keyword_ideas, lumen_rank_check, lumen_authority) over stdio or a thin Cloudflare Worker gateway.
  • Provenance on every number — each metric carries its source and fetch timestamp; no free source, no number.

Quickstart

Requires Node >= 22.7.

# One-off audit — no install

npx -y @lumen-seo/cli audit https://example.com

Install globally

npm install -g @lumen-seo/cli lumen audit https://example.com --max-pages 50

Wire it into Claude Code (or Cursor / VS Code — MCP onboarding):

claude mcp add --transport stdio lumen -- npx -y @lumen-seo/cli mcp

Then just ask: *"audit my site and tell me what to fix first."*

Packages

PackagePurpose
@lumen-seo/coretypes + payload models, config loader (failThreshold), Fetcher (SSRF/timeout/backoff), robots, provider/rule SPIs + registries
@lumen-seo/auditbounded crawler, 36 built-in AuditRules, severity scorer, report assembly
@lumen-seo/providersbuilt-in data providers (BYOK, free services only)
@lumen-seo/clilumen CLI, JSONL history, stdio MCP launcher
@lumen-seo/mcpMCP tool definitions + transport adapters (Cloudflare Worker)
@lumen-seo/sitedocs site (live)

Note on packaging: npm packages ship compiled JavaScript + type declarations (dist/) — plain node import, no flags, no tsx. The TypeScript sources stay the source of truth in the repo; the release pipeline compiles per package at publish time.

Documentation

Development

Requires Node >= 22.

npm install

npm run lint npm run typecheck npm test

See CONTRIBUTING.md for conventions, SECURITY.md for the security policy, and docs/release.md for the release runbook.

License

Apache-2.0 — Copyright 2026 Nitish Agarwal

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