# thejohnsonbros.com — plumbing and HVAC — 1 of 5

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> Probe-verified (tier 2 of 3). Last checked 2026-09-26. 1 of 5 capability checks passed. 2 unknown.

- host: thejohnsonbros.com
- url: https://thejohnsonbros.com/
- category: plumbing and HVAC
- type: business
- country: US
- locations: Quincy, MA
- language: en

## Probe-verified · tier 2 of 3

Probed live on 2026-09-26 against rubric v1.2. 1 of 5 checks passed. 2 unknown.

- UNKNOWN — Markdown negotiation (`Accept: text/markdown`)
- UNKNOWN — Markdown twin at a predictable URL (`/page.md`)
- FAIL — llms.txt (`/llms.txt`)
- FAIL — API catalog (`RFC 9727`)
- PASS — MCP server card answers (`/.well-known/mcp/server-card.json → tools/list`)

MCP tools (from tools/list on 2026-09-26): get_quote, emergency_help, open_customer_portal, search_service_history, submit_customer_info, customer_lookup, request_out_of_area_callback, get_availability, check_service_area, get_services_pricing, business_info, request_callback, request_booking, confirm_booking, search, fetch

## Unverified actions

Read from the page's own content, with the wording each was drawn from. Inference is kept separate from tested facts; an agent completing the action is tier 3.

- **book** — "" → `https://thejohnsonbros.com/ai-booking`

## Summary

Licensed family-owned plumbing and drain cleaning company serving 31 South Shore towns from offices in Quincy and Abington, Massachusetts, offering emergency plumbing, boilers, heating, and drains services with same-day availability.

## Context

109 sites in this index share the category "plumbing and HVAC"; 35 are transactional.

## How we grade

- tier 1 — **Declared**: The site says agents are welcome in its robots.txt. A permission, not a capability.
- tier 2 — **Probe-verified** (this site): We fetched the site and tested each signal ourselves. Dated, repeatable, re-checked on a schedule.
- tier 3 — **Behaviourally verified**: An agent completed the action end to end — booked, bought, submitted — and it worked.

## About this record

Known Good probes sites live and publishes what was tested and when.
Method: https://knowngood.sh/about.md · Rubric: https://knowngood.sh/benchmark

How we found this site: probe discovery. This site didn't declare agent access — we found it by checking the open web. Everything above was tested the same way, against the same rubric, on the date shown. [How we choose what to check, and how to opt out](https://knowngood.sh/bot)

## Where this sits

- United States: https://knowngood.sh/country/US
- business: https://knowngood.sh/type/business
- plumbing and HVAC: https://knowngood.sh/category/plumbing-hvac
- Browse: https://knowngood.sh/browse
- Rubric: https://knowngood.sh/benchmark