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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.

21 posts published

79 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

#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

#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

#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

#ai #devops #graphrag #webdev

15 min read

Jul 20

AI-Native Redesign: The Principles Don't Change — Only the Machinery Does

#ai #architecture #knowledgegraph #observability

28 min read

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Jul 13

Observability Design for the AI Era — Reconciling PII Protection With AI Searchability, and Driving Self-Healing

#ai #mcp #observability #typescript

13 min read

Shaping telemetry for AI readability

Jul 6

Observability Design for the AI Era — Application / Infrastructure / CI / LLM, Each in Its Own Shape

#ai #mcp #observability #typescript

11 min read

SLO targets for API and DB connectivity

Jun 29

Making the Context Across 46 Repositories Semantically Searchable for AI

#ai #knowledgegraph #staticanalysis #typescript

12 min read

Hidden connections AI often misses

Jun 22

Building One Knowledge Graph Across 46 Repositories With Static Analysis

#ai #knowledgegraph #staticanalysis #typescript

13 min read

Jun 1

Fixed Before Anyone Notices, Stronger After Every Fix: Self-Healing + Recurrence Prevention

#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

#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

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