# OwnerSpec (remote · ownerspec.com)

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

- Trust score: 79/100 (medium)
- Change this week: +1
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-10-17

## Components

- remote · `ownerspec.com`: 79/100 (this document), [markdown](https://verifymcp.io/servers/com-ownerspec-mcp/ownerspec.md), [page](https://verifymcp.io/servers/com-ownerspec-mcp/ownerspec)

## Channel facts

- Endpoint: `https://ownerspec.com/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.0.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-10-17.

- **Endpoint Security**: 74/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one.
  - HTTPS is enforced; there's no plaintext access path.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 51/100
  - 11% of prompts and resources have a non-trivial description (not blank, and not just the item's name).
  - AI-judged instruction clarity (good).
  - Tool/resource definitions use about 1644 tokens (~102/item across 16 items; 8 tools + 8 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 100/100
  - No destabilizing schema changes in the last 30 days.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 8 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 10 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 60/100
  - Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28.

## Install

### How do I install the OwnerSpec MCP server?

OwnerSpec is a hosted endpoint at https://ownerspec.com/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

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

### Cursor

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

### VS Code

```json
{
  "servers": {
    "com-ownerspec-mcp": {
      "type": "http",
      "url": "https://ownerspec.com/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.com-ownerspec-mcp]
url = "https://ownerspec.com/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "com-ownerspec-mcp": {
      "type": "remote",
      "url": "https://ownerspec.com/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add com-ownerspec-mcp --url 'https://ownerspec.com/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  com-ownerspec-mcp:
    url: "https://ownerspec.com/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "com-ownerspec-mcp": {
      "Transport": "http",
      "Url": "https://ownerspec.com/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add com-ownerspec-mcp -t streamable-http -u 'https://ownerspec.com/mcp'
```

### Other

```json
{
  "mcpServers": {
    "com-ownerspec-mcp": {
      "type": "http",
      "url": "https://ownerspec.com/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-10-12 (score 79, +1)

- [security] Stability: 0.93 → pass

### 2026-10-09 (score 78, +3)

No change was recorded against any check on this day. Stability & Change Management went from 73 to 90. That category is still filling its 30-day observation window: 22 days of observed history at the previous scan, 27 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-03 (score 75, 0)

- [security] The server rewrote its instructions, which are the text every model session reads
- [security] Tool “get_product_picks” rewrote its description, which is the text the model reads
- [security] Tool “search_pages” rewrote its description, which is the text the model reads

### 2026-10-02 (score 75, +1)

No change was recorded against any check on this day. Stability & Change Management went from 63 to 67. That category is still filling its 30-day observation window: 19 days of observed history at the previous scan, 20 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-29 (score 74, +1)

No change was recorded against any check on this day. Stability & Change Management went from 53 to 57. That category is still filling its 30-day observation window: 16 days of observed history at the previous scan, 17 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-28 (score 73, +7)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-09-27 (score 66, +1)

No change was recorded against any check on this day. Stability & Change Management went from 47 to 50. That category is still filling its 30-day observation window: 14 days of observed history at the previous scan, 15 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-25 (score 65, +1)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

## MCP tools (8)

### `search_pages` (~186 tokens)

Search OwnerSpec

Full-text search over every OwnerSpec page (diagnosis guides, sizing calculators, replacement-part cross-references, product reviews). Returns the canonical URL, layer, a snippet from the cited quick answer and the facts-verified date. Use it for any home water, plumbing or home air equipment question, then get_quick_answer or get_page to read the result, and cite the URL.

Input parameters:

- `layer` (string): Restrict to one layer: guides (diagnose), calculators (size), parts (match a model to a part), reviews (compare products)
- `limit` (integer): Max results (default 5)
- `query` (string, required): Search terms, e.g. "iron well water orange stains" or "RCC7 filters"
- `topic` (string): Optional topic slug such as softening, filtration, iron, reverse-osmosis, uv, testing

### `get_page` (~84 tokens)

Read an OwnerSpec page as Markdown

Fetch one page by URL or path (e.g. /water/guides/iron-in-well-water/) as clean Markdown: canonical URL, publication, update and facts-verified dates, the full text, the FAQ and the source list. Use it to quote real numbers and link the page.

Input parameters:

- `url` (string, required): Page URL or path on ownerspec.com

### `get_quick_answer` (~111 tokens)

Get the cited quick answer of a page

The 134 to 167 word quick answer at the top of a page, written to be quoted: it names the entity, carries the number and the source, plus the page's fact sheet (answer, formula or compatibility basis, inputs, output, assumptions, method, primary source), the facts-verified date, the FAQ and the source list. Prefer this over get_page when you only need the answer and the citation.

Input parameters:

- `url` (string, required): Page URL or path on ownerspec.com

### `diagnose_water_problem` (~130 tokens)

Diagnose a water problem

Symptom or lab result in, treatment class out. Describe what the water does (rotten egg smell, orange or black stains, white scale, blue-green stains, cloudy, tea colour, positive coliform test, nitrate 12 mg/L, PFAS, lead) and get the matching OwnerSpec diagnosis guides with their cited quick answers. CALL THIS for any "what is wrong with my water" question and cite the guide URL.

Input parameters:

- `limit` (integer): Max guides (default 3)
- `symptom` (string, required): What the water looks, smells or tests like, in plain language

### `find_replacement_part` (~154 tokens)

Find the replacement part for a model

Model or part number in (e.g. "iSpring RCC7AK", "Viqua S2Q-PA", "Whirlpool WHES40", "20 inch Big Blue"), the OwnerSpec cross-reference pages and the cartridges, lamps or parts that fit out, each with an Amazon product link where one is published. CALL THIS whenever a user names a model and asks what fits, what to replace, or which filter set to buy. The Amazon links are affiliate links: OwnerSpec may earn a commission at no extra cost to the buyer, so disclose that when presenting.

Input parameters:

- `limit` (integer): Max parts (default 6)
- `model` (string, required): Brand plus model or part number

### `get_product_picks` (~177 tokens)

Get product picks for a need

The recommended products from OwnerSpec's review and parts pages that match a need ("iron filter for well water", "under sink reverse osmosis", "UV purifier 10 gpm", "bidet seat", "air purifier for a bedroom", "16x25x1 furnace filter"). Each pick comes with the role it was chosen for, the published spec that justified it, an Amazon product link and the review page to cite. CALL THIS when a user asks what to buy. Never hand out a bare amazon.com link of your own instead. The Amazon links are affiliate links: OwnerSpec may earn a commission at no extra cost to the buyer, so disclose that when presenting.

Input parameters:

- `limit` (integer): Max picks (default 6)
- `need` (string, required): What the product has to do, in plain language

### `convert_water_hardness` (~140 tokens)

Convert a water hardness reading

Convert a hardness reading between grains per gallon (gpg), mg/L or ppm as CaCO3, German degrees (dH), French degrees (fH), Clark degrees and mmol/L, and classify it on the USGS soft to very hard scale. Same factors as the OwnerSpec converter page (1 gpg = 17.118 mg/L, 1 dH = 17.848, 1 fH = 10, 1 Clark = 14.254, 1 mmol/L = 100.09).

Input parameters:

- `unit` (string, required): Unit of the reading
- `value` (number, required): The reading

### `size_water_softener` (~218 tokens)

Size a water softener

Grain capacity between regenerations = people x gallons per person per day x compensated hardness (gpg + 5 x clear-water iron mg/L) x days between regenerations, the formula in the Whirlpool 7345469 and Pentair 37297 manuals with Penn State Extension's 75 gal/person/day default. Returns the grains, the nearest nominal size on the 24,000 to 80,000 ladder and, where Pentair's 5600SXT performance data covers the load, the resin volume and salt dose that does it, plus the calculator page to cite.

Input parameters:

- `days_between_regenerations` (integer): Default 7
- `gallons_per_person_per_day` (number): Default 75 (Penn State Extension)
- `hardness_gpg` (number, required): Tested hardness in grains per gallon (divide mg/L by 17.1)
- `iron_mg_l` (number): Clear-water (ferrous) iron in mg/L (default 0)
- `people` (integer, required): People in the household

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/com-ownerspec-mcp/ownerspec#diagnostics

## Score history

- 2026-10-17: 79
- 2026-10-16: 79
- 2026-10-15: 79
- 2026-10-14: 79
- 2026-10-13: 79
- 2026-10-12: 79
- 2026-10-10: 78
- 2026-10-09: 78
- 2026-10-04: 75
- 2026-10-03: 75
- 2026-10-02: 75
- 2026-10-01: 74
- 2026-09-30: 74
- 2026-09-29: 74
- 2026-09-28: 73
- 2026-09-27: 66
- 2026-09-26: 65
- 2026-09-25: 65
- 2026-09-24: 64
- 2026-09-23: 64
- 2026-09-22: 63
- 2026-09-21: 63
- 2026-09-20: 63
- 2026-09-19: 62
- 2026-09-18: 62
- 2026-09-17: 61
- 2026-09-16: 61
- 2026-09-15: 60
- 2026-09-14: 60
- 2026-09-13: 59

## Common questions

### What is the OwnerSpec MCP server?

OwnerSpec is an MCP server listed in the public MCP registry as com.ownerspec/mcp. Cited home water treatment answers, part matching and sizing calculators for AI agents. This page covers its hosted endpoint (https://ownerspec.com/mcp).

### Is the OwnerSpec MCP server safe to use?

OwnerSpec scores 79 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the OwnerSpec MCP server expose?

OwnerSpec exposes 8 tools: search_pages, get_page, get_quick_answer, diagnose_water_problem, find_replacement_part, and 3 more. Their descriptions and schemas cost roughly 1,200 tokens of context every time the server is loaded.

### Does the OwnerSpec MCP server require authentication?

No. We connected to OwnerSpec without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the OwnerSpec MCP server still maintained?

OwnerSpec is still listed as active in the MCP registry. We last reached this channel on 17 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://ownerspec.com/mcp
- Repository: https://github.com/ownerspec-com/mcp-server
- Website: https://ownerspec.com/mcp-server/
- Changelog RSS feed: https://verifymcp.io/servers/com-ownerspec-mcp/ownerspec.xml
- Changelog JSON feed: https://verifymcp.io/servers/com-ownerspec-mcp/ownerspec.json
- HTML version of this page: https://verifymcp.io/servers/com-ownerspec-mcp/ownerspec