What Actually Improves Claude Code Performance: Configuration and Architecture

Keeping Claude Code minimal, forcing full reasoning with three settings.json lines, and investing in system architecture — a practical take on what actually moves the needle.

April 15, 2026 · 2 min · Junho Lee
32 Slash Command Shortcuts That LLMs Instantly Understand

32 Slash Command Shortcuts That LLMs Instantly Understand

32 slash commands that work out of the box with Claude, ChatGPT, and Gemini – no custom definitions needed. Categorized by use case with practical combination strategies.

April 7, 2026 · 2 min · Junho Lee

Analyzing the Official GitHub Repository of a Major Korean Brokerage Open API

A structural analysis of the official sample code from a major Korean brokerage API, optimized for LLM agents and Python environments.

April 5, 2026 · 2 min · Junho Lee
OpenDocuments: A Local RAG Platform That Unifies Fragmented Team Knowledge

OpenDocuments: A Local RAG Platform That Unifies Fragmented Team Knowledge

An open-source platform that connects documents scattered across Notion, GitHub, and S3, then queries them with a local LLM. Runs entirely on-premise without external APIs.

April 1, 2026 · 2 min · Junho Lee
Using Korean Legal Data for AI Agent Development via Beopmang API

Using Korean Legal Data for AI Agent Development via Beopmang API

Parsing raw legal XML means broken table structures and half a day lost on preprocessing. Beopmang is an API that delivers pre-cleaned JSON, solving that problem upfront.

April 1, 2026 · 2 min · Junho Lee

Stop Giving Coding Instructions -- Borrow an Expert's Perspective Instead

Repeating ‘fix this’ only circles within problems you already know. Deploying expert personas reveals blind spots, and learning when to call which persona also saves tokens.

March 31, 2026 · 2 min · Junho Lee
The Unexpected Walls When Converting Web Pages with defuddle

The Unexpected Walls When Converting Web Pages with defuddle

Tried extracting web data for a RAG pipeline with defuddle and found results vary wildly by site structure. On sites where semantic HTML has collapsed, body text and ads mix together, and in dynamic rendering environments the content itself vanishes.

March 31, 2026 · 2 min · Junho Lee
How Data Preprocessing Determines RAG Quality and Leveraging Markdown Conversion Tools

How Data Preprocessing Determines RAG Quality and Leveraging Markdown Conversion Tools

Examining key features of a Python-based document conversion tool released by a global IT company, and proposing efficient approaches to handling data in LLM pipelines.

March 30, 2026 · 3 min · Junho Lee