HORIZON SHIELD: Construction Estimate Auditor for Japan (KIRA)

HORIZON SHIELD — Construction Estimate Auditor for Japan (KIRA)

A Model Context Protocol (MCP) server that lets an AI agent check whether a Japanese construction or renovation quote is fair — auditing it against an open 95,403-item cost database, flagging known overcharge tactics, and returning a verifiable, tamper-evident result. Neutral third party. No referral fees. No auto-posting.

WebMCP Intake (KIRA) is the public intake desk of HORIZON SHIELD. A homeowner commissioning construction work cannot reliably tell whether a quote is honest — a textbook credence-good problem. This server makes a neutral, third-party fair-price audit callable as a tool, so an agent can check a number instead of trusting it.

• Protocol: Model Context Protocol (MCP), streamable HTTP
• Endpoint: https://web.horizonshield.dev/mcp
• Access: read-only, no API key required
• Data region: Japan (JPY) — built on the open JCCDB dataset (95,403 line items) + 61 curated work categories
• Supervision: 30 years of construction field experience (Toshikatsu Oga, ORCID 0009-0000-9180-903X)
• Operator: THE HORIZONS INC — independent, takes no referral fees or kickbacks from contractors

What it does

Give it a work type (e.g. 外壁塗装 / exterior wall painting) and, optionally, the quoted price in JPY. It returns a fair-price verdict, flags known overcharge tactics with primary-source citations, and can draft public awareness content — all from verifiable first-party data, never guessed numbers. It never pressures, never auto-posts, and never gives a bare "too high / too low"; it hands you what to ask the contractor.

Tools

Tool	What it does
orchestrate	Start here. One call runs intake + tactic-scan + broadcast-draft together and returns a single bundle. The fastest way to see the whole server.
intake_estimate	Bridges a homeowner's quote (work + price in JPY) to the KIRA fair-price audit; returns a verdict plus a path to a free third-party check (EHN).
scan_tactics	Returns verified overcharge tactics for a given work type, with pointers to primary sources (Japan Consumer Affairs Agency, NCAC, the EHN case board). Awareness, not a price verdict.
draft_broadcast	Generates awareness drafts (long-form for note, short for X) with real backlinks. Verifiable first-party prices only; draft only — the operator finalizes. No auto-posting.

Try it (example prompts)

Once connected, ask your agent:

• 外壁塗装の見積もりが120万円。適正か診断して → runs intake_estimate
• Is a ¥1,200,000 exterior-wall-painting quote fair for a Japanese house? → intake_estimate
• シロアリ駆除でよくある過剰請求の手口を教えて → scan_tactics
• Run the full HORIZON SHIELD check on 屋根塗装, quoted ¥900,000 → orchestrate

Resources & prompts

Resources: about-horizon-shield, jccdb-dataset-info (95,403 items, license + citation), souba-categories (61 work categories), souba-sources (fair-price sources + regional multipliers), ehn-info (free anonymous estimate-review board). Resource templates: souba://category/{query} (category search), souba://price/{work} (fair price range: min / avg / max). Prompts: diagnose_my_estimate, how_to_read_an_estimate.

Connecting

This is a remote MCP server — point any MCP client at the endpoint:

{
  "mcpServers": {
    "horizon-shield-intake": {
      "command": "npx",
      "args": ["-y", "mcp-remote", "https://web.horizonshield.dev/mcp"]
    }
  }
}

Why trust it

• Neutral third party. Takes no referral fees or send-off rewards from contractors.
• Verifiable. Fair prices are returned as tamper-evident records with a SHA-256 hash, under a Pre-Transaction Knowledge Anchoring model (a third party records the fair price before the contractor's quote).
• Open data. Built on the public JCCDB dataset (95,403 line items) plus 61 curated categories with maintained price ranges and red flags.
• No pressure, no auto-posting. It returns what to ask, points to primary sources, and never publishes on its own.

バージョン番号と訂正

MCP レジストリが公開する server.json 内のバージョンと、このサーバーが serverInfo で報告する version は、このサーバーの運用期間の大半で異なる値でした。

2026-08-03   serverInfo 0.5.0
2026-08-09   serverInfo 0.5.0, server.json 0.4.1
2026-08-09   server.json がレジストリに 1.0.2 として公開される
2026-09-04   serverInfo 0.6.0, server.json とレジストリは引き続き 1.0.2

2026-09-04 に稼働中のエンドポイントで測定したところ、serverInfo.version は 0.6.0 を返しましたが、レジストリでは 1.0.2 となっていました。このリポジトリ内のほかの4つのサーバーでは2つの番号が一致しているため、これは例外であり、その例外についてはどこにも記録されていませんでした。

レジストリのバージョンは後戻りできないため、修正のために 0.6.0 を公開することはできませんでした。そこで両方の番号を 1.0.3 に進め、食い違っていた期間は削除せず、ここに記録しました。このリポジトリ内のすべてのサーバーを徹底的に調査した際に発見したもので、きっかけは hs-verify-gate（PR #17）と hs-hearing（PR #18）でも同種の不整合が見つかったことでした。これらでは、レジストリよりコードのほうが先行していました。

リンク

• ウェブサイト：https://shield.the-horizons-innovation.com
• 無料見積もり審査ボード（EHN）：https://shield.the-horizons-innovation.com/ehn/
• メインの MCP サーバー（生監査ツール）：https://mcp.horizonshield.dev

キーワード

建設見積もり、リフォーム見積もり、住宅改修、公正な価格、過剰請求の検出、費用の検証、施工業者の見積もり、価格ベンチマーク、日本、JCCDB、見積もり、外壁塗装、屋根塗装、リフォーム、過剰請求、相場、適正価格、消費者保護、クレデンス財