lin-yuchen | DevelopersIO

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クラスメソッド AI事業本部の生成AIエンジニア。Amazon Bedrock や LLM を使った本番RAGシステムを、データ取り込みからフロントエンドまで一気通貫で構築しています。QAから自動化開発を経て生成AIの道へ。「まず作って、試して、理解する」がモットーで、ハマったポイントや実践知を日英で発信します。旅行と映画が好きです。コア：Python, TypeScript, FastAPI, Next.js, Node.js 生成AI：Amazon Bedrock（Knowledge Bases, Converse API）, Claude / Anthropic SDK, RAG, エージェント, Vertex AI, Gemini クラウド／インフラ：AWS（CDK, EC2/Fargate, OpenSearch Serverless, S3）, GCP

lin-yuchenoharu121

Posts per Month

49Posts

The Story of Redesigning Claude Code Skills — Integrating xlsx/pptx/docx into ms-office-suite

2026.07.11

The story about metadata being stored in an unexpected format with hierarchical chunking in Bedrock Knowledge Bases

2026.07.11

# pnpm v11 minimumReleaseAge Causes Dependabot CI Failures ─ Root Cause, Workarounds, and Upstream Status Summary

2026.07.11

Private repository git fetch origin returns 403 — The pitfalls of URL-embedded PATs and countermeasures

2026.07.11

Do AI Coding CLI Tools Destroy SSDs? Investigating Disk Write Issues with Codex, Claude Code, and Claude Desktop

2026.07.11

# Claude Code Skills: Optimizing Diagram Generation — SVG vs Mermaid vs Excalidraw Comparison and Design Decisions

2026.07.11

I tried implementing a follow-up question widget in Google Chat Bot — Using inline forms in cardsV2

2026.07.11

Understanding the True Nature of MCP: From the Agent Loop of Tool Use to Two-Layer Error Handling in JSON-RPC 2.0

2026.07.10

Squash Merge Causes Orphaned Git Tags — Why git describe Stops Finding Them and How to Fix It

2026.07.10

Have a Google Chat Bot retain conversation history in Firestore to handle follow-up questions

2026.07.10

Migrated from Vertex AI SDK to google-genai — Pydantic-native structured output is convenient

2026.07.10

Pitfalls encountered when updating the Vertex AI RAG Engine knowledge base — uploading to GCS alone does not trigger synchronization

2026.07.10

I compared Marp and Reveal.js with the same content - Markdown slides vs HTML presentation

2026.06.28

aws-vault vs Granted: A Comparison of Tools for Securely Managing AWS Credentials on macOS

2026.06.28

Bedrock Converse API: Tracking Down "No Response from the 10th Time" — Pitfalls with Extended Thinking × Tool Use

2026.06.28

ちょっと話題の記事

Managing Postman became painful so I tried migrating to Bruno — VSCode integration, Git management, and secret management

2026.06.26

HTTP QUERY Method (RFC 10008) Implemented in Python: Getting a Feel for the Differences from GET and POST

2026.06.26

AI co-authored 40% of the codebase: A retrospective on 155 commits over 4 months

2026.06.25

LLMs Don't "Think": Understanding Hallucinations, Prompt Engineering, and Security Through the Mechanism of Token Prediction

2026.06.25

"The Accumulation of Failures" Gave Birth to LLMs (Part 2) — From Attention to the Scaling Revolution, and Then to Alignment

2026.06.24

"The Accumulation of Failures" Gave Birth to LLMs (Part 1) — From the Limits of Mathematics to the Geometry of Meaning

2026.06.24

ClipboardItem + Blob for Copying Rich Text and the HTTP Environment Trap

2026.06.21

Image Generation AI Architecture Showdown: Autoregressive vs Diffusion — Who Will Win in 2026?

2026.06.21

Next.js + FastAPI delivered via nginx subpath: 3 pitfalls I encountered — trailingSlash, routing separation, and MuleSoft SSE buffering

2026.06.21

I tried automatically building SSH tunnels and SOCKS5 proxies in Node.js using ssh2

2026.06.20

I tried fully automating 2-hop deployment via a bastion server with Node.js (ssh2)

2026.06.20

The story of fixing httplib2 thread safety issues — A trap in google-api-python-client

2026.06.19

When I tried to convert Google Chat Bot responses to rich text, I ended up having to deal with the HTML restrictions of Cards V2

2026.06.19

Diving Deep into React Hook Form's form.watch() — What I Learned Implementing Auto-Search Functionality

2026.06.19

Two Pitfalls with IME Composition in React: Enter to Submit and Debounced Auto-Search

2026.06.19

The Story of Implementing Knowledge Base Search by Connecting Vertex AI RAG Engine to Google Chat Bot

2026.06.19

Complete Guide to Security Scanning on Developer Machines — Covering Three Threat Axes with Bumblebee, TruffleHog, and OSV-Scanner

2026.06.15

I Reorganized Clean Architecture, SOLID, and DIP Again — Are They Still Useful in the Age of AI-Driven Development?

2026.06.11

I Built an Agent That Automatically Generates and Executes SQL from Natural Language Using Amazon Athena × Bedrock Converse API

2026.06.05

Ways to ignore files locally without editing .gitignore

2026.06.04

Bedrock Knowledge Bases Retrieve API Does Not Work with OpenSearch Serverless NextGen — Cause and Workaround

2026.06.02

Solved the problem of mixed responses to multiple inquiries in Amazon Bedrock RAG chatbot using the working buffer + archive pattern

2026.05.29

Benefits gained from migrating Claude invocations on Bedrock from boto3 to the Anthropic SDK

2026.05.29

4 Pitfalls I Hit Upgrading pnpm v10 to v11 — A Summary of Fixes for Docker and CI Environments

2026.05.29

The story of hitting wall after wall when implementing progressive UX with cardsV2 in Google Chat Bot

2026.05.29

I tried building a Google Chat Bot with minimal configuration using Cloud Functions + Python + uv

2026.05.27

必見の記事

Testing Gemma 4 Local Execution on MacBook (16GB) — From Model Selection with Ollama to UI Building and Practical Project Implementation

2026.04.09

I tried migrating Claude Cowork's Cron job from an individual plan to an enterprise plan

2026.04.06

I tried automatically generating daily recaps for Slack channels using Claude Cowork's scheduling feature

2026.03.26

"Survival Guide for 'Switching' from Windows to Mac"

2026.03.23

ちょっと話題の記事

The Story of How I Achieved Automatic Generation of AWS Architecture Diagrams Using Claude Code's Skill Function

2026.03.11

How to add "Open with VS Code" to right-click menu in macOS Finder

2026.03.06

ちょっと話題の記事

The story of how we achieved internal document search with Gemini's Google Workspace integration without building RAG

2026.03.05

I am Lin Yuchen from the AI Business Division. I have joined the Classmethod Group!

2026.03.02