Skip to content

DEV Community

Ryosuke Tsuji

I'm CTO at airCloset, Inc. airCloset is Japan's leading fashion rental subscription service.

Shibuya, Tokyo, Japan Joined on Mar 25, 2026 https://ryantsuji.dev

Education

Sophia University

Pronouns

he/him

Work

CTO at airCloset, Inc.

self-management

Ryan's personal knowledge graph + X automation.

TypeScript

ryantsuji-dev-content

Markdown source-of-truth for ryantsuji.dev blog. Syndicated to Zenn (JP) and dev.to (EN).

JavaScript

TypeScript / Node.js, MCP servers, BigQuery + Vertex AI, Pulumi / Cloud Run. Generalist with a deep focus on AI development infrastructure and code-as-SSoT knowledge graphs.

Patterns for AI-first development: knowledge graphs as the substrate AI agents stand on, MCP server ergonomics, and how to contain hallucination by structure rather than prompts.

cortex — airCloset's AI development platform. Product Graph (knowledge graph over code, docs, DB, infra), automated PR review on top, self-healing incident response, an MCP sandbox.

Discussions on AI harness design, knowledge graphs for code, and infrastructure that AI coding agents actually rely on. Also: leadership in companies where AI writes most of the code.

18 posts published

59 comments written

0 tags followed

Pinned

Building rails as an AI runway

Jun 16

AI Isn't Something to Trust — It's Something to Design (Series Final)

#ai #architecture #devops #engineering

20 min read

Self-healing guardrails for business-side PRs

Jun 8

The Author Doesn't Have to Be an Engineer: How the Harness Holds Quality (Series Part 5)

#ai #devops #engineering #github

16 min read

May 19

The Heart of the AI Harness: A Knowledge Graph of the AI, by the AI, for the AI (Series Part 2)

#ai #graphrag #jsdoc #mcp

23 min read

The 'heal and hide' risk of automated fixes

May 12

Building a Real AI Harness: Auto-Reviewed PRs, Self-Healing Ops, and Non-Engineer Contributors (Series Intro)

#ai #devops #graphrag #webdev

14 min read

SLO targets for API and DB connectivity

Jun 29

Making the Context Across 46 Repositories Semantically Searchable for AI (Part 2)

#ai #knowledgegraph #staticanalysis #typescript

12 min read

Want to connect with Ryosuke Tsuji?

Create an account to connect with Ryosuke Tsuji. You can also sign in below to proceed if you already have an account.

Already have an account? Sign in

Hidden connections AI often misses

Jun 22

Building One Knowledge Graph Across 46 Repositories With Static Analysis (Part 1)

#ai #knowledgegraph #staticanalysis #typescript

13 min read

Jun 1

Fixed Before Anyone Notices, Stronger After Every Fix: Self-Healing + Recurrence Prevention (Series Part 4)

#ai #devops #github #observability

22 min read

May 26

Human-on-the-Loop: AI Reviewing AI PRs at cortex -- 769 PRs/month while raising the quality bar (Series Part 3)

#ai #codereview #devops #productivity

19 min read

May 17

Minimal post (test fixture)

1 min read

Solving the join problem over similarity

May 7

Graph RAG Isn't a One-Shot Anymore — The Case for Agentic Graph RAG MCPs

#ai #graphrag #mcp #webdev

15 min read

May 1

Cutting Self-Built MCP Server Token Usage by 90% — The Parking Pattern

#ai #architecture #mcp #webdev

7 min read

Apr 27

Bridging 'I Want to Build' and 'I Want to Publish Safely' for Non-Engineers — Sandbox MCP

#ai #mcp #typescript #webdev

16 min read

Apr 20

Still Measuring Initiative Impact Manually? How We Used Graph RAG + MCP to Make It Explorable

#ai #bigquery #typescript #webdev

12 min read

Apr 11

How We Built an Automated Meeting Intelligence System with Google Meet, Slack, and RAG

#ai #gcp #typescript #webdev

19 min read

Apr 7

We Built 17 MCP Servers to Let AI Run Our Internal Operations

#ai #gcp #typescript #webdev

8 min read

Mar 25

Democratizing Internal Data — Building an MCP Server That Lets You Search 991 Tables in Natural Language

#ai #mcp #security #webdev

14 min read

loading...