# kensaurus合同会社 (kensaurus LLC)

> Tokyo studio (Shibuya) that upgrades old PHP systems without switching
> them off (urgent security fixes, upgrades to supported versions, staged
> migration), and builds software, mobile and web apps, IoT and 3D, photo and
> video, and the revival of empty buildings and rural places, starting with
> its own 24-hour mountain lounge in Tsumagoi.
> Founded 2025-06-06 by Kenji Sakuramoto. Operates across 6 languages
> (English, Japanese, Chinese, Thai, Vietnamese, Malay).

kensaurus合同会社 is a small Japanese LLC registered in Shibuya, Tokyo. It
builds and runs its own apps, and a 24-hour mountain lounge in Tsumagoi, Gunma,
where guests sleep in their own car or tent. It offers
services across 12 business categories: AI / Software / Mobile, Web / SaaS / PWA, IoT / 3D / センサー, セキュリティ / PHP / 移行, 帳簿 / 申告 / AI, 写真 / 映像 / 編集, 記事 / 映像 / 配信, SEO / 広告 / 集客, キャンプ / テレワーク / アウトドア, 共同作業 / オフィス / ラウンジ, 空き家 / 改修 / 活用, and 地方創生 / 田舎 / 関係人口.
Everything under Live products is public and running today. Services are
described on the homepage.

## Services

- [Work with us](https://kensaur.us/work/en/) ([日本語](https://kensaur.us/work/)): Custom development for clients in Japan (booking sites with Stripe, Square or PayPay payments; AI chat on a website, LINE and a front-door kiosk; camera and sensor dashboards), consulting for small inns, campgrounds and coworking spaces, and a Ranch Monitor pilot (terms being set). The case study is Tsumagoi Work&Camp, whose whole system one person built and runs. The first 30-minute online call is free; site visits by arrangement with travel costs; everything else is quoted. Contact by email: kensaurus@gmail.com.
- [Legacy PHP upgrades](https://kensaur.us/notes/legacy-upgrade/en/) ([日本語](https://kensaur.us/notes/legacy-upgrade/)): Inventory and urgent fixes, a safety net of behaviour tests and a rehearsed rollback, one-step upgrades to PHP 8.3 / 8.4, and a staged move to a newer stack only where it pays. Quoted per stage; no exploit code handled.
- [php2shell response](https://kensaur.us/notes/php2shell/en/) ([日本語](https://kensaur.us/notes/php2shell/)): What CVE-2026-109618 / CVE-2026-109619 affect, what to do today, and the end of PHP 8.2 security support on 2026-12-31.

## About

- [Homepage](https://kensaur.us/): Company overview, portfolio, services, and contact.
- [Founder](https://kensaur.us/notes/maker/en/) ([日本語](https://kensaur.us/notes/maker/)): Kenji Sakuramoto (仙人けんじ). IT consulting, cyber security and app development through his 20s and 30s. In 2025 he leased a closed ranch rest house at 1,444 m in Tsumagoi, renovated it and opened Tsumagoi Work&Camp in August 2026, funded by the company's IT revenue and, since April 2026, the founder's own savings and salary. His page on the camp's site: [tsumagoi.kensaur.us/kenji](https://tsumagoi.kensaur.us/kenji).
- [GitHub](https://github.com/kensaurus): Open-source repositories (mushi-mushi, kenji skills, and more).
- [The kensaurus family](https://kensaur.us/apps.json): Every app as JSON, with names and taglines in English and Japanese, deep links to useful pages, and which apps relate to which.

## Live products

- [Work & Camp](https://tsumagoi.kensaur.us/): A 24-hour mountain lounge, run by us. Tsumagoi Work&Camp is a 24-hour lounge at 1,444 m in Tsumagoi, Gunma, on a former ranch where the nearest homes are about 10 km away by road. Guests sleep in their own car or pitch a tent anywhere on the field, work from the Kotatsu Lounge on fiber internet, and end the day by the fire. We renovated the buildings ourselves, built most of the furniture on site, and opened in August 2026. The website, online booking, payments and on-site sensors are all software we wrote.
  - Pages: [Book a stay](https://tsumagoi.kensaur.us/reserve) · [The fiber office](https://tsumagoi.kensaur.us/office) · [Events at the ranch](https://tsumagoi.kensaur.us/events) · [Who runs it](https://tsumagoi.kensaur.us/kenji) · [Getting there](https://tsumagoi.kensaur.us/access)
- [Mushi Mushi](https://kensaur.us/mushi-mushi/): Tells you why your AI-built app broke, and hands the fix to your editor. Error trackers record what the code throws, so a bug that throws nothing, like a button hidden behind a header, slips past them. Mushi Mushi adds a small report-a-bug button to any website or app, and can also look for bugs before anyone reports them. AI rates each report, groups duplicates, explains the likely cause in plain words and drafts a fix you can hand to Cursor, Claude Code or Lovable. A second AI reviews each fix, and nothing merges unless you merge it or turn on automatic merging, which is off by default. It is open source, with a free hosted plan.
  - Pages: [See a sample diagnosis](https://kensaur.us/mushi-mushi/docs/demo/diagnosis) · [Quickstart](https://kensaur.us/mushi-mushi/docs/quickstart) · [Mushi on our own apps](https://kensaur.us/mushi-mushi/docs/proof) · [Source on GitHub](https://github.com/kensaurus/mushi-mushi)
- [Solo Boss](https://solo-boss.kensaur.us/): Solo Boss keeps the books for one-person companies in Japan and takes them through to the tax filing. Bank lines and receipts become journal entries with AI help, the AI shows why it suggested each entry, and a check of more than 30 points catches mistakes before you file. Already use other accounting software? Import its journal instead. A read-only sample company lets you look around without signing up, and it is free for now.
  - Pages: [Why it exists](https://solo-boss.kensaur.us/why) · [Free tools](https://solo-boss.kensaur.us/tools) · [Learn bookkeeping](https://solo-boss.kensaur.us/simulator?mode=learn) · [Pricing](https://solo-boss.kensaur.us/pricing)
- [kenji skills](https://github.com/kensaurus/skills): Step-by-step playbooks that keep AI coding assistants on track. AI coding assistants such as Claude Code, Cursor, Codex and Gemini often stop halfway, or say a job is done when it is not. kenji skills is a free, open-source set of written procedures they follow step by step, from fixing a bug to shipping a release, and a separate AI checks that the work is really finished. We use it on every project we run, and it installs with one command.
  - Pages: [Install](https://www.skills.sh/kensaurus/skills) · [Getting started](https://github.com/kensaurus/skills/blob/main/docs/GETTING-STARTED.md) · [Every skill](https://github.com/kensaurus/skills/blob/main/docs/CATALOG.md)
- [Ranch Plan](https://kensaur.us/tsumagoi-plan/): The business plan behind Tsumagoi Work&Camp. Before the camp opened, we published its business plan as an interactive website: what the old ranch building would become, what it would cost, and which permits each service needs. The six-page plan we prepared for the bank and insurers is part of it.
  - Pages: [Before and after](https://kensaur.us/tsumagoi-plan/#gallery) · [Floor plan](https://kensaur.us/tsumagoi-plan/#floorplan) · [Read in English](https://kensaur.us/tsumagoi-plan/?lang=en)
- [Project Ledger](https://kensaur.us/daily-reports/): A daily work log for a team’s projects. Project Ledger is a work diary for teams: each person records what they did and for how many hours, project by project. The public example runs on made-up demo data: a fictional clinic booking app, its team and every entry.
- [Wedding Kiosk](https://kensaur.us/20251102dinner/): A guest kiosk and RSVP page made for one wedding. Made for our founder’s own wedding dinner: a tablet at the entrance where guests could check the schedule, read how the couple met and look through their photos. A separate page collected RSVPs for the beach ceremony. The live site is password-protected, for invited guests only.
- [Skin Analysis](https://kensaur.us/skin-analysis/): Take one selfie in natural light and get scores for more than 20 skin concerns, such as pores, hydration and texture, plus 4 to 6 care tips. Claude reads the photo. It is free and needs no account. The photo is never stored, and nothing is saved unless you make a share link.
  - Pages: [Take the selfie](https://kensaur.us/skin-analysis/capture/)
- [ProjectFlow](https://kensaur.us/project-flow/): Projects, estimates, invoices and delivery in one place. ProjectFlow is a management dashboard for teams that deliver work to clients. It follows each job from estimate to delivery and invoice, so nobody has to piece the picture together from spreadsheets and chat threads. It works in English and Japanese.
- [glot.it](https://kensaur.us/glot-it/): A Thai learning app with an AI tutor. glot.it teaches Thai to people starting from zero, whether for a trip, a Thai partner or family, or work. It covers the Thai script, the five tones and everyday speaking, with an AI tutor you can talk to. It runs in the browser and on iPhone and Android. (Android · iOS)
  - Pages: [60-second tone test](https://kensaur.us/glot-it/features/tone-ear/) · [The five Thai tones](https://kensaur.us/glot-it/learn/thai-tones/) · [The Thai alphabet](https://kensaur.us/glot-it/alphabet/) · [Phrases for a trip](https://kensaur.us/glot-it/learn/thai-phrases-for-travelers/)
- [help her take photo](https://kensaur.us/help-her-take-photo/): help her take photo links two phones. One is the camera, and the other shows that camera’s view live, so the person being photographed can see the shot and direct it before it is taken. It is made for couples and friends who travel together, on iPhone and Android. (Android · iOS)
  - Pages: [Better photos of your partner](https://kensaur.us/help-her-take-photo/guides/partner-photos) · [Travel photo ideas for two](https://kensaur.us/help-her-take-photo/guides/couple-travel-photo-ideas) · [In Japanese](https://kensaur.us/help-her-take-photo/ja/)
- [yen-yen](https://kensaur.us/yen-yen/): yen-yen is a household money book that two people, or a whole family, keep together. It never asks for your bank login: add spending by hand in a few seconds, snap a receipt, or paste a bank statement, and AI reads it for you to check before anything is saved. Each expense goes into one of four kakeibo groups, so by the weekend you can see where the money went. On iPhone and Android. (Android · iOS)
  - Pages: [What kakeibo is](https://kensaur.us/yen-yen/kakeibo) · [No bank login](https://kensaur.us/yen-yen/no-bank-login) · [In Japanese](https://kensaur.us/yen-yen/ja) · [Pricing](https://kensaur.us/yen-yen/pricing)
- [Konte](https://kensaur.us/konte/): Plan and make an 8-second AI video, step by step. Konte (Japanese for storyboard) walks you through a short AI video the way a film crew works: pick a template, write the scene, choose the camera and mood, review, then render. Google’s Veo makes the video with your own Gemini API key, so Google bills you directly and Konte charges nothing. It is a prototype, first built for babuu AI.
  - Pages: [How it works](https://kensaur.us/konte/how-to) · [Open the studio](https://kensaur.us/konte/studio)
- [the wanting mind](https://kensaur.us/the-wanting-mind/): A book about why we want, free to read online. Why do people want, and why do some take while others give? the wanting mind is a 36-chapter book by our founder that follows that question through neuroscience, economics, philosophy and anthropology. It is free to read on the web and in the iPhone and Android apps. (Android · iOS)
  - Pages: [Start with the preface](https://kensaur.us/the-wanting-mind/en/preface) · [Preface in Japanese](https://kensaur.us/the-wanting-mind/ja/preface) · [Explore the concept map](https://kensaur.us/the-wanting-mind/en/explore) · [Try the simulations](https://kensaur.us/the-wanting-mind/en/simulations)
- [lets-talk](https://talk.kensaur.us/): Practise difficult conversations with an AI coach. lets-talk helps you work out what to say when a message is hard to answer, from an upset boss, partner or friend. Paste their message to see their side and get replies you could send, write your own reply and get it scored, or rehearse the whole chat with an AI that plays the other person. On iPhone, Android and the web. Start free with no account; after the included practice, sign in for credits or use your own Anthropic key. It is a practice tool, not therapy. (Android · iOS)
  - Pages: [Try it as a guest](https://talk.kensaur.us/advise) · [Rehearse the chat](https://talk.kensaur.us/simulate) · [Field notes](https://talk.kensaur.us/notes)
- [Hear, Hear](https://kensaur.us/hear-hear/): Live transcription in your browser, no account. Hear, Hear turns speech into text while people talk, using the browser’s own speech recognition (in Chrome, that means Google’s). Every line keeps its timestamp, and tapping a line replays that moment. There is no account, and the recordings and transcripts are saved only in your browser. In this public version a recording can run up to five minutes.
  - Pages: [Start recording](https://kensaur.us/hear-hear/recording/) · [How it works](https://kensaur.us/hear-hear/#how)

## In development

- Bento: Bento is a prototype workspace for planning, collecting material, making things with AI, reviewing and shipping, all in one loop. Development is paused, and it is not open to the public right now. (in development)

## Writing

Posts by the studio about its own products, newest first.

- [ひとりのキャラクター、7つの世界](https://note.com/kensaurus/n/n3be39e1d1c44) — note, 2026-11-13 (ja)
- [自作のアプリとサイト7つに、同じキャラクターを描きました。モデルは私です。](https://x.com/sakuramotokenji/status/2121071488342381004) — X, 2026-11-13 (ja)
- [1人のキャラクターを6つの新しい画風で描く：画像生成63回・$4.68のマスコット制作パイプライン](https://zenn.dev/kensaurus/articles/a925025703bee8) — Zenn, 2026-11-13 (ja)
- [小さなPC 1台で、山を24時間ライブ配信する：止まった理由と直し方](https://kensaur.us/notes/tsumagoi-live-cam/) — kensaurus, 2026-11-09 (ja)
- [Streaming a mountain 24/7 from one small PC: what broke, and what fixed it](https://kensaur.us/notes/tsumagoi-live-cam/en/) — kensaurus, 2026-11-09 (en)
- [仕事中に開いておける山を、ひとつ。浅間山の24時間ライブ配信](https://note.com/kensaurus/n/ne0801eb0a9f0) — note, 2026-11-09 (ja)
- [Since Sunday, the camera on our deck has been live on YouTube, around the clock.](https://www.linkedin.com/feed/update/urn:li:activity:7525375491156074497/) — LinkedIn, 2026-11-09 (en)
- [24時間ライブ配信の3つの小技：カメラの音の時計で風をつくる、跳ねずに1文字ずつ打つ、24時間くり返さない台詞](https://zenn.dev/kensaurus/articles/66059b36ae6bae) — Zenn, 2026-11-09 (ja)
- [東京新聞に、嬬恋牧場Work&Campを載せていただきました](https://note.com/kensaurus/n/n5cdd7b7d9d78) — note, 2026-11-06 (ja)
- [東京新聞（11月6日・群馬版）で、嬬恋牧場Work&Campを紹介していただきました。](https://www.facebook.com/tsumagoicamp/posts/pfbid02vSUzoTTbG5hq1kxQ4K4bBDB1A9yUZBUsx2KjY11APhZT5XKzEr2kHX9jhKVctdvEl) — Facebook, 2026-11-06 (ja)
- [東京新聞の群馬版（11月6日）で、嬬恋牧場Work&Campを取り上げていただきました。](https://www.instagram.com/tsumagoicamp/p/DfYpNHxGe2E/) — Instagram, 2026-11-06 (ja)
- [Tokyo Shimbun's Gunma pages featured Tsumagoi Work&Camp this morning.](https://www.linkedin.com/feed/update/urn:li:activity:7524314806980640768/) — LinkedIn, 2026-11-06 (en)
- [東京新聞の群馬版で、嬬恋牧場Work&Campを取り上げていただきました。](https://x.com/sakuramotokenji/status/2118548230648816117) — X, 2026-11-06 (ja)
- [The maples around our field turned red this week. The ranch monitor read 6 °C at 7 a.m.](https://www.linkedin.com/feed/update/urn:li:activity:7523999858689511424/) — LinkedIn, 2026-11-05 (en)
- [いちばん近い民家まで、道のりで約10km。標高1,444mの元牧場です。](https://x.com/sakuramotokenji/status/2117968181943996828) — X, 2026-11-04 (ja)
- [「どのボタンを押せばいいか」を文章で書くのをやめて、画面を録画した](https://note.com/kensaurus/n/nb65a60ea7a04) — note, 2026-11-03 (ja)
- [Something I kept running into while writing docs for my own tool: the hardest thing to explain in text is "which button do I press now?"](https://www.linkedin.com/feed/update/urn:li:activity:7523358697201250304/) — LinkedIn, 2026-11-03 (en)
- [本物のラウンジを、ゲームの中で歩けるようにした：写真から描いたドット絵の室内](https://zenn.dev/kensaurus/articles/27dc6fe189b884) — Zenn, 2026-11-02 (ja)
- [日本の家はなぜ寒いのか。山のラウンジを灯油ではなくエアコンで暖める理由](https://kensaur.us/notes/heat-pump-lounge/) — kensaurus, 2026-11-01 (ja)
- [Why Japanese homes are cold, and why our mountain lounge heats with heat pumps](https://kensaur.us/notes/heat-pump-lounge/en/) — kensaurus, 2026-11-01 (en)
- [日本の家は、なぜ寒いのか。標高1,444mで灯油とエアコンを測って考えた](https://note.com/kensaurus/n/nd8c6dbd09d4e) — note, 2026-11-01 (ja)
- [A walk through Tsumagoi Work&Camp, in photos and in pixels.](https://www.linkedin.com/feed/update/urn:li:activity:7522428507457536000/) — LinkedIn, 2026-11-01 (en)
- [“Build a house for the summer. In winter, you can live anywhere.”](https://www.linkedin.com/feed/update/urn:li:activity:7522565233870020608/) — LinkedIn, 2026-11-01 (en)
- [受付のない入口に置いたタブレットの設計：全画面ウェブアプリと、触っていないときだけの更新](https://zenn.dev/kensaurus/articles/594292467837c7) — Zenn, 2026-11-01 (ja)
- [受付のない山の牧場で、入金も、こたつの消し忘れも、水タンクの残りも、気づくのがいつも遅れました。](https://bsky.app/profile/kensaur.us/post/3mz5btam7ck2m) — Bluesky, 2026-10-31 (ja)
- [入口のタブレットが、もうひとりの受付になった](https://note.com/kensaurus/n/n34ebddbb3761) — note, 2026-10-31 (ja)
- [山に来る前に、本物のラウンジをゲームで歩ける。ホームページをゲームにした話](https://note.com/kensaurus/n/nc574db89fe9d) — note, 2026-10-31 (ja)
- [A short update on the Ranch Monitor](https://www.linkedin.com/feed/update/urn:li:activity:7522081057417138176/) — LinkedIn, 2026-10-31 (en)
- [There's no one at the front desk at Tsumagoi Work&Camp, so a tablet at the entrance does the greeting.](https://www.linkedin.com/feed/update/urn:li:activity:7522184673662337024/) — LinkedIn, 2026-10-31 (en)
- [You can walk around our lounge before you drive up the mountain. It's a game now.](https://www.linkedin.com/feed/update/urn:li:activity:7522283078296248320/) — LinkedIn, 2026-10-31 (en)
- [20代と30代をITの仕事に費やしてきた自分が、貯金を元手に群馬・嬬恋の標高1,444mで場所づくりを始めました。](https://x.com/sakuramotokenji/status/2116359935244296340) — X, 2026-10-31 (ja)
- [お金・安全・電気・水を一枚で見る「牧場モニター」の設計](https://zenn.dev/kensaurus/articles/0994e37e2dc59f) — Zenn, 2026-10-31 (ja)
- [受付のいない山の牧場を、一枚の見取り図で回す：牧場モニター](https://kensaur.us/notes/ranch-monitor/) — kensaurus, 2026-10-30 (ja)
- [Ranch Monitor: the control room for a mountain site with no front desk](https://kensaur.us/notes/ranch-monitor/en/) — kensaurus, 2026-10-30 (en)
- [仙人の管理室：ひとりで山の牧場を回すダッシュボード](https://note.com/kensaurus/n/n1351460b875d) — note, 2026-10-30 (ja)
- [There's no front desk at Tsumagoi Work&Camp.](https://www.linkedin.com/feed/update/urn:li:activity:7521838333681905664/) — LinkedIn, 2026-10-30 (en)
- [AIに直させたバグ修正を、別のAIが305回「マージするな」と止めた話](https://zenn.dev/kensaurus/articles/b7f223e0c9bf5d) — Zenn, 2026-10-30 (ja)
- [ユーザーはバグを報告してくれない。8つのアプリを60日見て分かったこと](https://note.com/kensaurus/n/n2157e8d303d9) — note, 2026-10-29 (ja)
- [I build small apps on my own with AI coding tools, and I run a campsite in the mountains of Gunma.](https://www.linkedin.com/feed/update/urn:li:activity:7521415885341818880/) — LinkedIn, 2026-10-29 (en)
- [I build apps alone with Cursor and Claude Code. Agents fix a lot of my bugs, and a second AI reviews each fix.](https://x.com/sakuramotokenji/status/2115612842812735787) — X, 2026-10-29 (en)
- [タイ語の記憶のヒントを、学ぶ人の言語で作る：glot.it のプロンプトと、まだつながっていないところ](https://zenn.dev/kensaurus/articles/c8410a5fd7bbb9) — Zenn, 2026-10-29 (ja)
- [How long is my audiobook? Three numbers, and only one measured the audio](https://dev.to/kenji_sakuramoto_d72920b2/how-long-is-my-audiobook-three-numbers-and-only-one-measured-the-audio-4l2k) — DEV, 2026-10-25 (en)
- [会議や講義を、ブラウザだけで文字にする「Hear, Hear」を作っています。](https://x.com/sakuramotokenji/status/2113948621561643131) — X, 2026-10-24 (ja)
- [撮り合うたびの「見せて…撮り直し」を減らすアプリ「help her take photo」を作っています。](https://x.com/sakuramotokenji/status/2113586242239746065) — X, 2026-10-23 (ja)
- [止めずに、少しずつ新しくする。古いPHPシステムのアップグレード](https://kensaur.us/notes/legacy-upgrade/) — kensaurus, 2026-10-22 (ja)
- [Upgrading an old PHP system without switching it off](https://kensaur.us/notes/legacy-upgrade/en/) — kensaurus, 2026-10-22 (en)
- [PHPの重大な脆弱性 php2shell：対象と今日やること、そして年末の期限](https://kensaur.us/notes/php2shell/) — kensaurus, 2026-10-22 (ja)
- [php2shell: which PHP versions are hit, what to do today, and the year-end deadline](https://kensaur.us/notes/php2shell/en/) — kensaurus, 2026-10-22 (en)
- [タイ語は声調が5つ、1つずれると「馬」が「犬」に。声に出すと、ずれた所がピッチ曲線で見えます。](https://x.com/sakuramotokenji/status/2113223852524515670) — X, 2026-10-22 (ja)
- [kenji skillsのnpmインストーラは依存0、installスクリプトなし、通信なし、シェル実行なし。](https://x.com/sakuramotokenji/status/2112861467112349928) — X, 2026-10-21 (ja)
- [言いにくい話を先に練習できる会話コーチ「lets-talk」を作っています。](https://x.com/sakuramotokenji/status/2112499075190800394) — X, 2026-10-20 (ja)
- [Mushi MushiのMCPサーバーはエディタ側のモデルで動くので、LLMのキーを別に用意しなくていい。](https://x.com/sakuramotokenji/status/2112136683844239688) — X, 2026-10-19 (ja)
- [kenji skills: 161 agent skills, 63 slash commands and 6 subagents for Claude Code and Cursor.](https://x.com/sakuramotokenji/status/2112166876792930436) — X, 2026-10-19 (en)
- [Mushi Mushi: open-source bug widget for AI-built apps.](https://x.com/sakuramotokenji/status/2111804488877035524) — X, 2026-10-18 (en)
- [自分の合同会社の決算と申告のために「一人社長」を作り、毎月使っています。](https://x.com/sakuramotokenji/status/2111411913200672985) — X, 2026-10-17 (ja)
- [声調ひとつで「馬」が「犬」になる。自分の言葉で覚えるタイ語アプリ glot.it](https://kensaur.us/notes/glot-it/) — kensaurus, 2026-10-16 (ja)
- [One tone off and “horse” becomes “dog”: why I built glot.it for Thai](https://kensaur.us/notes/glot-it/en/) — kensaurus, 2026-10-16 (en)
- [登録なしで、会話を時刻つきの文字に残す。ブラウザの文字起こし Hear, Hear](https://kensaur.us/notes/hear-hear/) — kensaurus, 2026-10-16 (ja)
- [Keep a conversation as timed text, with no account: Hear, Hear](https://kensaur.us/notes/hear-hear/en/) — kensaurus, 2026-10-16 (en)
- [「ちょっと見せて…消して」をなくしたくて作ったカメラ](https://kensaur.us/notes/help-her-take-photo/) — kensaurus, 2026-10-16 (ja)
- [A camera for the “let me see… delete it” moment](https://kensaur.us/notes/help-her-take-photo/en/) — kensaurus, 2026-10-16 (en)
- [「完了しました」で止まるエージェントに、手順書と完了の関門を渡す](https://kensaur.us/notes/kenji-skills/) — kensaurus, 2026-10-16 (ja)
- [My agents kept saying “done” when they weren't, so I wrote the playbooks down](https://kensaur.us/notes/kenji-skills/en/) — kensaurus, 2026-10-16 (en)
- [言いにくい返事を、送る前に練習する lets-talk](https://kensaur.us/notes/lets-talk/) — kensaurus, 2026-10-16 (ja)
- [lets-talk: rehearse the message you're dreading](https://kensaur.us/notes/lets-talk/en/) — kensaurus, 2026-10-16 (en)
- [このアプリたちを作っている人のこと](https://kensaur.us/notes/maker/) — kensaurus, 2026-10-16 (ja)
- [Who makes these apps, and why](https://kensaur.us/notes/maker/en/) — kensaurus, 2026-10-16 (en)
- [エラーにならないバグの報告を、マージ前の修正案まで。Mushi Mushi](https://kensaur.us/notes/mushi-mushi/) — kensaurus, 2026-10-16 (ja)
- [From “this is broken” to a reviewed fix PR: Mushi Mushi](https://kensaur.us/notes/mushi-mushi/en/) — kensaurus, 2026-10-16 (en)
- [ひとり会社の帳簿と申告の道具を作り、自分の申告で間違えて直した話。一人社長](https://kensaur.us/notes/solo-boss/) — kensaurus, 2026-10-16 (ja)
- [I built a bookkeeping and filing tool for my one-person company, and it got my own filing wrong](https://kensaur.us/notes/solo-boss/en/) — kensaurus, 2026-10-16 (en)
- [「人はなぜ欲しがるのか」を追う、読んで聴ける本 the wanting mind](https://kensaur.us/notes/the-wanting-mind/) — kensaurus, 2026-10-16 (ja)
- [the wanting mind: a book about why we want, to read, hear and ask](https://kensaur.us/notes/the-wanting-mind/en/) — kensaurus, 2026-10-16 (en)
- [銀行とつながない、夫婦で続ける家計簿 yen-yen](https://kensaur.us/notes/yen-yen/) — kensaurus, 2026-10-16 (ja)
- [yen-yen: a money book for two that never touches your bank](https://kensaur.us/notes/yen-yen/en/) — kensaurus, 2026-10-16 (en)
- [行間を読めるまで何年もかかった私が、練習アプリに「話し方の背景」を入れた理由](https://note.com/kensaurus/n/n03394aa575a8) — note, 2026-10-16 (ja)
- [旅先の写真係として叱られてきたので、シャッターを撮られる人に渡すカメラを作りました](https://note.com/kensaurus/n/n3f4f0fc76ec7) — note, 2026-10-16 (ja)
- [家族と同じ家計簿をリアルタイムで見たくて、Expense IQ から自分の家計簿アプリに移りました](https://note.com/kensaurus/n/ne5784e655aa1) — note, 2026-10-16 (ja)
- [読んでいるページについて、本に質問できる本を作っています。](https://x.com/sakuramotokenji/status/2111049536328081559) — X, 2026-10-16 (ja)
- [From "this is broken" to a fix PR I merge by hand](https://dev.to/kenji_sakuramoto_d72920b2/from-this-is-broken-to-a-fix-pr-i-merge-by-hand-cbh) — DEV, 2026-10-15 (en)
- [空き家だった牧場の建物を、働ける場所にするまで](https://note.com/kensaurus/n/n3939be2a5f55) — note, 2026-10-15 (ja)
- [管理画面の中身を、もう少し：朝の画面・売店・Wi-Fi・カメラ・集客](https://note.com/kensaurus/n/n81718b6c88c6) — note, 2026-10-15 (ja)
- [Claude Code向けのスキル集 kenji skills を公開しています。](https://x.com/sakuramotokenji/status/2110687135334289483) — X, 2026-10-15 (ja)
- [エラーにならないバグ（押しても反応しないボタン、12秒かかる画面）を拾うOSS、Mushi Mushiを作っています。](https://x.com/sakuramotokenji/status/2109962351047008436) — X, 2026-10-13 (ja)
- [「このバグを直して出して」で手順が走る、エージェント用スキル集の中身とインストーラの安全設計](https://zenn.dev/kensaurus/articles/0a9dfa74cc02db) — Zenn, 2026-10-13 (ja)
- [「夕ご飯作った。食べた。それから、無事かどうか考えてた。」にどう返す？](https://x.com/sakuramotokenji/status/2109599977240424875) — X, 2026-10-12 (ja)
- [言いにくい話を、送る前に練習するアプリを作っています](https://note.com/kensaurus/n/n5dce49ac7520) — note, 2026-10-11 (ja)
- [タイ旅行の前に、屋台で注文できるくらいのタイ語を。](https://x.com/sakuramotokenji/status/2109237584128024765) — X, 2026-10-11 (ja)
- [ひとり法人の決算と申告のためのWebツール「一人社長」を作っています。](https://x.com/sakuramotokenji/status/2108875187798396947) — X, 2026-10-10 (ja)
- [KENSAURUSでつくっているもの](https://x.com/sakuramotokenji/status/2108907311460950468) — X, 2026-10-10 (ja)
- [山のキャンプ場を、ひとつの管理画面で動かしている話](https://note.com/kensaurus/n/nc1cc2d957fad) — note, 2026-10-09 (ja)
- [山のキャンプ場を夫婦二人で回すために作った管理画面の話を書きました。](https://x.com/sakuramotokenji/status/2108406757668307082) — X, 2026-10-09 (ja)
- [ESP32・カメラ・Wi-Fi・決済を、山のキャンプ場の管理画面ひとつにまとめた](https://zenn.dev/kensaurus/articles/e40517e9a47043) — Zenn, 2026-10-09 (ja)
- [銀行連携なしで、夫婦で続けられる家計簿アプリ「yen-yen」をつくりました](https://note.com/kensaurus/n/n4a1daf002ee9) — note, 2026-10-08 (ja)
- [ひとり法人の決算ツールを作り、自分の申告で間違えて直した話](https://note.com/kensaurus/n/n52f6aae48a72) — note, 2026-10-08 (ja)
- [「人はなぜ欲しがるのか」を追う、無料で読める本を作っています](https://note.com/kensaurus/n/n61789d6a6e45) — note, 2026-10-08 (ja)
- [標高1,444mの元牧場で、光回線のラウンジとキャンプ場をやっています](https://note.com/kensaurus/n/n702a944f62ba) — note, 2026-10-08 (ja)
- [銀行連携なしで、夫婦で共有できる家計簿アプリ「yen-yen」を作っています。](https://x.com/sakuramotokenji/status/2108098786665050359) — X, 2026-10-08 (ja)
- [山にオフィスを立てた。](https://x.com/sakuramotokenji/status/2108114317585580525) — X, 2026-10-08 (ja)
- [「人はなぜ欲しがるのか」を追う本「the wanting mind」を作っています。](https://x.com/sakuramotokenji/status/2108146093376860363) — X, 2026-10-08 (ja)
- [アプリ内のバグ報告をMCP経由でエディタに渡す仕組みと、その設計](https://zenn.dev/kensaurus/articles/0c8f927b20adaf) — Zenn, 2026-10-08 (ja)
- [Two months ago my wife and I opened a small campground and coworking space on an old ranch in Tsumagoi, Gunma, 1,444 metres up.](https://www.linkedin.com/feed/update/urn:li:activity:7513494239079677953/) — LinkedIn, 2026-10-07 (en)
- [Thai has five tones. One slip and "horse" (ม้า) becomes "dog" (หมา).](https://bsky.app/profile/kensaur.us/post/3mvick26dfe2e) — Bluesky, 2026-09-14 (en)
- [A 147,000-word interactive book as a free SPA, and the stack behind it](https://dev.to/kenji_sakuramoto_d72920b2/i-shipped-a-147000-word-interactive-book-as-a-free-spa-heres-the-stack-55i0) — DEV, 2026-04-23 (en)

### Press coverage

Articles about the studio written by others, newest first.

- [仕事とキャンプ…元牧場を理想郷に](https://www.tokyo-np.co.jp/article/526393) — Tokyo Shimbun, 2026-11-06 (ja)

### Profiles

- [Zenn @kensaurus](https://zenn.dev/kensaurus)
- [note @kensaurus](https://note.com/kensaurus)
- [X @sakuramotokenji](https://x.com/sakuramotokenji)
- [Bluesky @kensaur.us](https://bsky.app/profile/kensaur.us)
- [LinkedIn Tsumagoi Work&Camp](https://www.linkedin.com/company/142923144/)

## Optional

- This file follows the [llmstxt.org](https://llmstxt.org) convention.
- Sitemap: [https://kensaur.us/sitemap.xml](https://kensaur.us/sitemap.xml)
- App family (JSON): [https://kensaur.us/apps.json](https://kensaur.us/apps.json)
- Robots policy: [https://kensaur.us/robots.txt](https://kensaur.us/robots.txt)