OwnerSpec is answering right now. Last checked 13 min ago. It exposes 13 tools. Last commit 25 Oct 2026.
Cited home water treatment answers, part matching and sizing calculators for AI agents.
Uptime history
52 days of history · worst day 93%
52 days agonow
100.0%
Uptime 24h
91 of 91 checks
13
Tools
read from the server
160 ms
Response time
average over 24h
0
Stars
last commit 25 Oct 2026
What changed 10
Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 2 October 2026. No other catalogue keeps this.
25 Oct
5 tools appeared
list_calculators, plan_home_maintenance, read_water_report and 2 more
25 Oct
2 tool descriptions were rewritten
find_replacement_part, get_product_picks
25 Oct
a tool changed version
2 Oct
2 tool descriptions were rewritten
get_product_picks, search_pages
OwnerSpec missed one check this week
Everything else answered, so this is steady rather than shaky. We check every 15 minutes, which is how a one-off gets told apart from the start of a pattern, and how you hear about the next one within the hour instead of from your users.
Connect this server
Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 13 min ago.
run in your terminal
claude mcp add mcp --transport http https://ownerspec.com/mcpSettings → Connectors → Add custom connector, then paste this address
https://ownerspec.com/mcp~/.codex/config.toml
[mcp_servers.mcp]
url = "https://ownerspec.com/mcp".cursor/mcp.json
{
"mcpServers": {
"mcp": {
"url": "https://ownerspec.com/mcp"
}
}
}.vscode/mcp.json
{
"servers": {
"mcp": {
"type": "http",
"url": "https://ownerspec.com/mcp"
}
}
}Available tools 13
Read directly from the server with tools/list, grouped by what they act on.
If a tool disappears, we record the date.
calculator
run_calculator
Open one OwnerSpec calculator, prefilled with the user's numbers. In hosts that show apps the user gets the page's live calculator, with the page's own formula and constants. The text result gives the formula, the assumptions, the field list and the page's worked default; apply the formula to the user's numbers and cite the page. Get ids and field names from list_calculators.
calculators
list_calculators
Every OwnerSpec sizing and cost calculator (softener, RO, UV, well pump, expansion tank, tankless and tank water heaters, sump pump, dehumidifier, air purifier CADR, space heater and thermostat costs, heat cable and more) with its id and input fields. Call it before run_calculator to pick the id and the field names.
convert
convert_water_hardness
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).
diagnose
diagnose_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.
page
get_page
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.
pages
search_pages
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.
plan
plan_home_maintenance
A dated maintenance schedule for the equipment a household owns: furnace filters, smoke alarms, washing machine hoses, tank and tankless water heater flushing, refrigerator water filters, air purifier filters and humidifier wicks or panels. Each interval is the one the maker or body prints (ENERGY STAR, NFPA, IBHS, A.O. Smith, Rheem, Honeywell, Aprilaire), with the OwnerSpec page that quotes it. Give last-done dates for real due dates.
product
get_product_picks
The products OwnerSpec's review and parts pages recommend for 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 and the review page that compares it. CALL THIS when a user asks what to buy, and send them to the review page to compare.
quick
get_quick_answer
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.
replacement
find_replacement_part
Model or part number in (e.g. "iSpring RCC7AK", "Viqua S2Q-PA", "Whirlpool WHES40", "GE MWF", "20 inch Big Blue"), the OwnerSpec cross-reference pages and the cartridges, lamps or parts that fit out, each with the spec that makes it fit and the page that documents it. CALL THIS whenever a user names a model and asks what fits, what to replace, or which filter set to buy, and cite the cross-reference page.
size
size_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.
troubleshoot
troubleshoot_home_equipment
A fault on home plumbing or air equipment in, the OwnerSpec guides that explain it out: a smoke or carbon monoxide alarm chirping or beeping, a water heater popping, leaking or giving no hot water, a running toilet, a sump pump that will not start, banging pipes, condensation, a softener not using salt. Returns each guide's cited quick answer. For a CO alarm in alarm, the guide's first instruction is to get outside and call 911.
water
read_water_report
Lab, test-kit or utility (CCR) results in, each one compared with the EPA limit printed on OwnerSpec's EPA limits table: enforceable MCLs and action levels, PFAS MCLs, radionuclides and the non-enforceable secondary standards (iron, manganese, TDS, pH). Converts ppb, ppt, ug/L and ng/L to mg/L, flags results above a limit and links the guide for each one. Pass results as a list, or paste the report text. Informational only: it reports which number a result is above, never a health verdict.
Endpoints
| URL | Transport | State | Latency | Checked |
|---|---|---|---|---|
| https://ownerspec.com/mcp | streamable-http | answering | 187 ms | 13 min ago |
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OwnerSpec — questions
Answers built from our own checks of this server.
What can OwnerSpec do?
It exposes 13 tools, read directly from the server on our last check. Among them: convert_water_hardness, diagnose_water_problem, find_replacement_part, get_page, get_product_picks, get_quick_answer and 7 more. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README.
How MCP servers expose tools in the first place →
Is OwnerSpec working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 160 ms. The bar chart above shows every period we have measured.
How do I connect OwnerSpec?
Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does OwnerSpec need an API key?
No. OwnerSpec completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 13 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is OwnerSpec?
It answers our handshake in 160 ms on average, which is faster than 79% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.
Is OwnerSpec open source?
The code is open source: it is published under the MIT licence, written in JavaScript and 0 stars on GitHub. The licence covers the code in the repository, not the hosted service at ownerspec.com, which runs on its operator's own terms.