# 練馬のリフォーム・リノベーション 山口建設 | 小さな会社だからこそできること。小さな会社でないとできないこと。

> Probe-verified (tier 2 of 3). Last checked 2026-08-23. 2 of 5 capability checks passed.

- host: www.k-yamaken.com
- url: https://www.k-yamaken.com/
- category: home renovation contractor
- type: business
- country: JP
- locations: Nerima, Toshima, Itabashi, Nakano, Suginami, Shinjuku, Bunkyo, Musashino, Nishitokyo, Wako, Niiza, Asaka, Japan
- language: ja

## Probe-verified · tier 2 of 3

Probed live on 2026-08-23 against rubric v1. 2 of 5 checks passed.

- fail — Markdown negotiation
- fail — Markdown twin at a predictable URL
- PASS — llms.txt
- PASS — API catalog
- fail — MCP server answers

## 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.

- **contact** — "無料相談フォームへ"
- **request_quote** — "無料お見積り受付中"

## Summary

Yamaguchi Construction offers remodeling, renovation, and new construction services in Nerima since 1990 with free consultation and estimates.

## Context

3040 sites in this index share the type "business"; 1936 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