b612 (hakuto AI)
https://mcp.hakuto-0209.com/mcp ↗
Description
Design-review copilot: industry design checkpoints, edge cases, and Japanese legal notes.
What our measurements say
b612 (hakuto AI) is a remote MCP server published at mcp.hakuto-0209.com. It has been probed 6 times since 9/13/2026. It answered in 6 of them (100.0%), a near-uninterrupted record. Median response time is 958 ms, a delay an agent will notice. It offers a narrow, focused set of 8 tools. On the protocol side it still runs 2025-11-25 and has not moved to the newer spec.
Agent readability score
Can an LLM agent pick the right tool here — names, descriptions and parameter clarity are assessed.
Agent readability score
Agent readability score
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| Run | Era | Modern | ms | Legacy | ms | Versions |
|---|---|---|---|---|---|---|
| 2026-09-13 14:49:35 | Legacy | 400 | 784 | 200 | 810 | 2025-11-25 |
| 2026-09-13 12:47:19 | Legacy | 400 | 804 | 200 | 835 | 2025-11-25 |
| 2026-09-13 10:45:14 | Legacy | 400 | 647 | 200 | 550 | 2025-11-25 |
| 2026-09-13 08:43:04 | Legacy | 400 | 991 | 200 | 958 | 2025-11-25 |
| 2026-09-13 06:40:42 | Legacy | 400 | 1016 | 200 | 1069 | 2025-11-25 |
| 2026-09-13 04:35:29 | Legacy | 400 | 1130 | 200 | 1061 | 2025-11-25 |
Schema compliance
tools/list structure, inputSchema validity, and a functional smoke test — the components of the 0-100 score.
- tools/list schema valid
- inputSchema is valid JSON Schema
- Smoke test passed · last run:
- Cold-start: cold 143ms → warm 147ms (penalty 0ms)
Tools
Tools the server advertised in the latest measurement — measured, not catalog-claimed.
b612_principlesb612 メソッドの思考の核（NO SPECULATION・実装前の3問自問・5原則・握りつぶし禁止）を返す。レビューや実装を始める前に読み、原則に沿って進めること。
b612_review_checklist対象の種類に応じた b612 のレビュー観点を返す。返ってきた観点を使って呼び出し側の AI が実レビューを行う。対応: lp, hp, ec, api, saas, game, form, generic
target_typestringrequired
b612_patternsb612 の実戦ノウハウ（典型エラー・推測実装の傾向・過去に効いた意思決定）を返す。案件固有名は含まない公開版。全文は約88,000字あるため、既定は見出し索引のみを返す。query に検索語を渡すと一致した節だけを返す（推奨）。
querystringfullbooleanmax_charsnumber
b612_domain_preset業種/ドメイン別の必須モデル・エッジケース・必須法令・アンチパターンを返す。対応ドメイン: accounting, ai-chat, ai-content-ops, android, beauty, blog, booking, chat, community, corporate, corporate-story, crm, ec, event, fukushi, game, healthcare, hr, instagram, inventory, ios, line, llmo, lms, lp, pos, project, rag, realestate, restaurant, retrogame, saas, seo, subscription, survey, task
domainstringrequired
b612_rulesコードに当てる検出ルール（ID・重大度・なぜ危険か・直し方）の一覧を返す。**呼び出し側の AI がこのルールを手元のコードに当てて検査する**（コードは b612 サーバーに送らない）。握りつぶし / 秘密の直書き / 0行更新の見逃し / タイマー多重起動 / 印刷崩れ / 破壊的SQL / XSS 等。ルールID: swallow-empty-catch, swallow-catch-comment-only, swallow-nullish-default, swallow-nullish-any, supabase-update-without-select, hardcoded-secret, console-log-secret, raf-loop-not-idempotent, setinterval-no-clear, top-level-sdk-client, next-force-dynamic, print-transform-scale, global-element-selector, img-no-dimensions, destructive-sql, bulk-update-no-where, dangerous-html, eval-use, mcp-stdout-log, line-postback-encode, dark-body-light-surface, print-white-text, last-child-visual, aspect-ratio-with-object-position, tap-target-too-small, leftover-min-height, overflow-hidden-full-height, empty-element-no-fallback, fail-open-secret-c
b612_designホームページ・LP・UI・チラシを作る前に必ず引く。生成AIが出しがちで顧客に「AIくさい」と言われる形（注記の左に色の縦棒・器と同じ色の面・均一な3列カード・全部同じ角丸と影）の禁止事項と、カードは角張らせる・並びの間隔は親のgapで持つ・複雑なSVGは無料素材を使う、などの必須事項を返す。あわせて、放っておくと生成AIが出さない6つ（斜めの帯・斜めの文字・派手なCTA・追従CTA・写真の上の文字・飾りの浮遊）と、そのまま貼れるCSS/JSの一覧を返す。snippet に名前を渡すとその実装を全文返す。
snippetstring
b612_notes利用者が hakuto の公式LINE に送ったメモを読み込む。「今日のメモをまとめて」「昨日のメモ見せて」「今週のアイデア整理して」などと言われたらこれを使う。days で遡る日数を指定する（既定は1＝今日ぶん）。返ってくるのは日付ごとに並べた生のメモ。要約・分類・タスク化は、この結果を読んで自分で行うこと。
daysinteger
b612_updateb612 のアップデート。エージェント・法令ファイル・業種プリセット・雛形・参照ドキュメントを最新に更新する手順を返す。「b612 をアップデートして」「b612 を最新にして」と言われたらこれを使う。返ってきたコマンドを実行すると、手元と違うファイルだけが置き換わる（既存は .bak を残す）。新しい専門エージェントが増えたときや、法令が改正されたときに実行する。
base_urlstring
Availability history
Each block is one measurement round. Green: working response. Amber: responded but the server was returning errors (5xx). Red: no response at all.
Era history
Each cell is one probe run. Faded cells are incomplete probes — one leg did not answer, so the era is inconclusive.
Response time history
The two probe legs separately: modern server/discover and legacy initialize.
Event log
Derived by comparing consecutive probes — changes in era, protocol version, build and reachability.
- Added to watch — era: Legacy
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