OwnerSpec

Name: OwnerSpec
Author: ownerspec-com

by ownerspec-comversion 1.0.0i★ –iRuns in the cloud

Registry namecom.ownerspec/mcp

Install

Overview

Description from the maker (original English)

Cited home water treatment answers, part matching and sizing calculators for AI agents.

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 in the cloud
Transport: Streamable HTTP
Category: Other

Install

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

Before you install

Basic checks: 1 of 1 passed
Runs on the maker’s server: what you ask it goes through their server.
The registry lists no key to fill in.

You need

Runs in the cloudNothing to install; it connects over the internet

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

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

Works in Claude on the web, desktop and mobile:

Open Settings → Connectors
Press Add custom connector
Paste the address below and press Add
If it asks you to sign in, sign in with the maker

https://ownerspec.com/mcp

Run this in your terminal

claude mcp add --transport http ownerspec https://ownerspec.com/mcp

Open in Cursor

Or copy the settings yourself

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

{
  "mcpServers": {
    "ownerspec": {
      "url": "https://ownerspec.com/mcp"
    }
  }
}

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": {
    "ownerspec": {
      "type": "http",
      "url": "https://ownerspec.com/mcp"
    }
  }
}

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.

ChatGPT connects only to servers on the internet:

Open ChatGPT on the web → Settings → Connectors (Apps)
Press Create or Add (some plans need Developer mode under Advanced first)
Paste the address below, give it a name and save
If it asks you to sign in, sign in with the maker

https://ownerspec.com/mcp

Menu names can differ slightly by plan and over time.

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

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

What it can do

We have not read this server’s tool list yet; we check endpoints in rotation.

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 7, 2026

✓ Pass
Maker matches the repo
The registry name was verified against the domain ownerspec.com (the registry checks domain ownership)
… 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 checked yet
Endpoint responds
Not checked yet; we check endpoints in rotation
… Not checked yet
Sign-in with OAuth
Not checked yet; we check endpoints in rotation
… Not checked yet
No hidden instructions in tool descriptions
Not checked yet; we read the tool list when we check the endpoint

Compared with others in Otheri

More stars than 0% of the other 32545 servers in this category
Published to the registry more recently than 42% of the other 32545 servers in this category
Basic checks equal to or better than 100% of the other 32545 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 OwnerSpec 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 in the maker’s cloud. Connect over the internet with nothing to install, but what you send passes through the maker’s servers.

Is it still maintained?

The GitHub repo last changed –, and the latest version (1.0.0) reached the registry 2 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT in developer mode.

What can I use instead?

In the same category: Spec Driven Development, Remote Desktop Commander, Python MCP

Alternatives

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

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MCP Server that facilitates spec-driven development workflows, not just Vibe Coding.

Runs on your computer★ 440MITUpdated 14 months ago

Install

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Remote Desktop Commander: use files, terminal and processes on your own computers from any AI app.

Runs in the cloud★ 211Updated yesterday

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Python MCP

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Local-only Python MCP server for the Files.com API.

Runs on your computerUpdated today

Install

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.

OwnerSpec MCP Server

The official Model Context Protocol server for OwnerSpec.com, an independent, numbers-first reference for the equipment people own and maintain at home, in three categories: home water treatment (softeners, sediment and carbon filters, reverse osmosis, UV, iron, hardness, sulfur smell, well water testing), home plumbing (water heaters, leaks, freeze protection, toilets, faucets, sump pumps, dehumidifiers) and home air (air purifiers and CADR, humidifiers, furnace filters and MERV). Every figure on the site is cited to EPA, NSF/ANSI, WQA, DOE, AHAM, a state extension service or the manufacturer's own document, and every page carries the date its facts were verified.

Live endpoint: https://ownerspec.com/mcp

Stateless Streamable HTTP transport (JSON-RPC 2.0 over POST), no authentication, no sessions. Any MCP client can connect and start calling tools immediately.

Connect

Claude Code

claude mcp add --transport http ownerspec https://ownerspec.com/mcp

Claude.ai / Claude Desktop: Settings, Connectors, Add custom connector, https://ownerspec.com/mcp, no authentication.

ChatGPT: Settings, Connectors, Advanced, Developer mode, then add https://ownerspec.com/mcp as an MCP connector (no auth).

MCP Inspector

npx @modelcontextprotocol/inspector https://ownerspec.com/mcp

Tools

Tool	What it does
`search_pages`	Full-text search over every page, filterable by layer (guides, calculators, parts, reviews) and topic
`get_page`	Fetch one page as clean Markdown with canonical URL, dates and sources
`get_quick_answer`	The page's cited 134 to 167 word quick answer, its fact sheet (answer, formula or compatibility basis, inputs, assumptions, method, typed primary source), verified date, FAQ and typed source list: the passage to quote
`read_water_report`	Lab, test-kit or utility results in, each compared with the EPA limit on OwnerSpec's EPA table, with unit conversion and the guide to read
`diagnose_water_problem`	Symptom or lab result in, the matching diagnosis guides and their quick answers out
`troubleshoot_home_equipment`	A beeping alarm, a popping water heater, a pump that will not start: the guides that explain it
`find_replacement_part`	Model or part number in, the cartridges, lamps or parts that fit out, with the cross-reference page
`get_product_picks`	The picks from the review and parts pages that match a need, with the review page that compares them
`list_calculators`	Every OwnerSpec calculator with its id and input fields
`run_calculator`	One calculator prefilled with the user's numbers: the page's live calculator in apps, the formula in text
`convert_water_hardness`	gpg, mg/L, dH, fH, Clark and mmol/L, with the USGS band
`size_water_softener`	Grain capacity between regenerations, nearest nominal size and the salt-efficient Fleck 5600SXT row
`plan_home_maintenance`	A dated maintenance schedule, each interval quoted from the maker or body that prints it

All tools are read-only and annotated readOnlyHint: true, destructiveHint: false.

MCP App

In hosts that support MCP Apps (io.modelcontextprotocol/ui), eight tools render an interactive view: the live calculator with the user's numbers, a flagged water report table, a dated maintenance plan, and cards for guides, parts and picks. The view (functions/_lib/widget.js, served as ui://ownerspec/view-v1.html) is one self-contained HTML document with a hand-written postMessage bridge, no SDK and no third-party origin. Calculators run the site page's own form and script, taken from /index.json, so the in-chat answer is the page's answer.

Every answer ends with the URL to cite and the facts-verified date. The two ported calculator tools use the same constants as the calculator pages on the site, run_calculator runs the page's own code, and the site's build fails if either side drifts.

The server also exposes resources (llms.txt, llms-full.txt, the sitemap, the search index, the OpenAPI description, auth.md) and one prompt, answer_from_ownerspec.

A2A agent

functions/a2a.js is a minimal A2A agent at https://ownerspec.com/a2a: a question in a SendMessage (or message/send) call, a completed task out whose artifact holds the matching pages, quick answers and URLs to cite. Card: https://ownerspec.com/.well-known/agent-card.json.

Markdown for agents

The whole site is agent-readable, not just this server:

Any page returns Markdown when requested with Accept: text/markdown, or at its URL plus index.md.
Discovery files: /.well-known/mcp/server-card.json, /llms.txt, /.well-known/agent-skills/index.json, /.well-known/api-catalog, /.well-known/ard.json, /openapi.json, /auth.md.
Human documentation: ownerspec.com/mcp-server.

Transparency

OwnerSpec is an affiliate-funded site, but this server returns no product links, no prices and no ads: picks come back with the OwnerSpec review page that compares them, and the affiliate links and their disclosure live on that page. Editorial content is free to read, with no paywall and no auth. The site makes no medical claims and neither do the tools: contaminant figures are quoted as EPA, WHO or state limits. Privacy: ownerspec.com/legal/privacy (section 2.5).

Self-hosting

This is a Cloudflare Pages Function (functions/mcp.js, functions/a2a.js, shared code in functions/_lib/). To run your own instance:

Deploy the functions/ directory with a Cloudflare Pages project in front of a static site.
The server reads its content live from the site it fronts: a build that emits /index.json (one record per page: title, url, layer, topic, dates, quick answer, FAQ, sources, picks, text) and a Markdown twin at /index.md. Point the SITE constant at your deployment.
Replace the calculator constants in mcp.js with the ones printed on your own pages, or remove those two tools.

This repository mirrors the production functions. Keep them in sync with your own site config if you fork it.

License

MIT

OwnerSpec

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

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

Python MCP

README from the maker

OwnerSpec MCP Server

Connect

Tools

MCP App

A2A agent

Markdown for agents

Transparency

Self-hosting

License