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
macshot: A Native macOS Tool Emerging as an Alternative to Paid Apps

macshot: A Native macOS Tool Emerging as an Alternative to Paid Apps

A look at macshot, a native open-source macOS screenshot and screen recording tool that delivers powerful features without the subscription burden.

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
Thinking Like an Agent Conductor in the AI Era

Thinking Like an Agent Conductor in the AI Era

Even after adopting agents, if the work structure itself does not change, productivity does not scale. Reid Hoffman’s conductor strategy starts by breaking that illusion.

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
Optimizing Large-Scale Excel Downloads in Spring Boot

Optimizing Large-Scale Excel Downloads in Spring Boot

A Spring Boot library for streaming 1M-row Excel downloads without OOM. A single annotation eliminates the boilerplate.

April 1, 2026 · 2 min · Junho Lee
OpenDocuments: A Self-Hosted RAG Platform Connecting Scattered Team Knowledge

OpenDocuments: A Self-Hosted RAG Platform Connecting Scattered Team Knowledge

A self-hosted RAG platform that runs on Ollama to unify team documents scattered across Notion, GitHub, and S3. Natural language search works even in air-gapped environments without external APIs.

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
Overcoming NotebookLM's Generation Limits with Script-Based Control

Overcoming NotebookLM's Generation Limits with Script-Based Control

When NotebookLM stops at 20 slides, most people just give up. Designate a single master script as the source and push through with code-style commands to generate 40 slides.

March 31, 2026 · 2 min · Junho Lee

Building an Organic AI Collaboration Flow from Planning to Visualization

How assigning Claude, Perplexity, and NotebookLM to distinct stages of lecture planning changes the workflow. The point is not using more tools but knowing which tool fits which stage.

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
Practical Agent Design Lessons from the OpenAI Guide

Practical Agent Design Lessons from the OpenAI Guide

Letting an agent handle planning end-to-end causes it to loop and stall in production. The OpenAI guide addresses this with explicit workflow control.

March 31, 2026 · 2 min · Junho Lee
Directory Design and SOPs That Make or Break AI Agent Organizations

Directory Design and SOPs That Make or Break AI Agent Organizations

When you first deploy AI agents, outputs land in random folders and formats vary every time. Aligning folder structure to the org chart and codifying SOPs is what makes quality consistent.

March 31, 2026 · 2 min · Junho Lee

Cutting Through Claude Code Setup Confusion with Plugin Advisor

If you have ever stalled in front of the plugin list when first setting up Claude Code, Plugin Advisor narrows that entrance. Preset Packs and pre-flight checklists catch runtime errors before they happen.

March 31, 2026 · 2 min · Junho Lee
Automating Business Reports with a Multi-AI Pipeline

Automating Business Reports with a Multi-AI Pipeline

Connecting NotebookLM, Claude, and Gemini as a pipeline to turn reports into slides. A single model struggles to handle structuring and formatting simultaneously – splitting roles produces better results at each stage.

March 31, 2026 · 2 min · Junho Lee
Hands-On Notebooks for the Updated LangChain Ecosystem

Hands-On Notebooks for the Updated LangChain Ecosystem

With LangChain’s move to v1, legacy chain code has become outdated. A repository of Korean Jupyter notebooks walks through LangGraph’s State and Node design step by step.

March 31, 2026 · 2 min · Junho Lee
Automating Tedious Metric Collection with Python and GitHub Actions

Automating Tedious Metric Collection with Python and GitHub Actions

Examining an automated reporting system built with Python and GitHub Actions to escape the tedium of manually checking macroeconomic indicators every day.

March 31, 2026 · 3 min · Junho Lee
Automating High-Quality HTML Slides with AI Agents and make-slide

Automating High-Quality HTML Slides with AI Agents and make-slide

Analyzing a workflow where an AI agent trained on design principles generates polished presentation materials as a single HTML file.

March 30, 2026 · 3 min · Junho Lee
Data Structure Design for Efficient n8n Workflows

Data Structure Design for Efficient n8n Workflows

Addressing data bottlenecks encountered during API integrations and applying n8n’s core mechanics to real-world practice.

March 30, 2026 · 3 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
Legal Data Gets a Brain: The Synergy of korean-law-mcp and DataNexus

Legal Data Gets a Brain: The Synergy of korean-law-mcp and DataNexus

korean-law-mcp streamlines legal data access while DataNexus’s knowledge-graph-based ontology layer explicitly maps complex statutory connections, significantly enhancing AI’s ability to interpret law accurately.

March 30, 2026 · 3 min · Junho Lee