[Claude Code] Building a Real-Time Agent Dashboard
How I built a real-time monitoring dashboard to visualize what 19 Claude Code subagents are doing – from a failed Gather Town experiment to a practical WebSocket-powered control center.
Posts by Category
- Development 51
- macOS 14
- Language 12
- PC 12
- AI 12
- Apple 11
- Playground 9
- Agentic Coding Assistant 7
- Objective-C 6
- CS 6
- Software Engineering 6
- SmartHome 5
- CI/CD 5
- LLM 5
- iOS 4
- Blog 4
- Jekyll 4
- Kiro 4
- Server 3
- Synology 3
- Ruby 3
- SCM 3
- Git 3
- Xcode 3
- Writing 3
- Column 3
- Python 2
- Claude Code 2
- Spring 1
- Fundamental 1
- Mathematics 1
- CocoaPods 1
- Event 1
- Router 1
- Java 1
- Code Quality 1
- Docker 1
- MCP 1
- Swagger 1
Development
[Claude Code] Designing an Expert Team with Subagents
How to build an expert team from planning to deployment by combining Claude Code’s Subagents, Skills, Rules, Hooks, and MCP Servers.
[Kiro] MCP Server Configuration
A guide on how to configure and manage MCP servers in Kiro, with practical examples.
[Kiro] Agent Configuration
A guide covering agent creation, configuration, prompt modularization, and sub-agent usage in Kiro.
[Kiro] CLI Installation and Settings
A guide on how to install Kiro CLI and the key configuration options in the cli.json settings file.
[Kiro] Kiro x Claude: 3-Tier AI Service Architecture
An analysis of how Kiro calls Claude models through a Client Layer + 3-Tier Service Layer, and why the same model delivers different performance depending on the App Provider.
[LLM] HyDE — Hypothetical Document Embeddings
An overview of HyDE (Hypothetical Document Embeddings), a technique for improving retrieval quality in RAG.
[LLM] LangChain Core Concepts — LCEL, Prompt Templates, Message Classes
An overview of LangChain’s LCEL, prompt templates, message classes, MessagesPlaceholder, and RunnableGenerator.
[LLM] Integrating LLMs with the Ollama Python Library
Using the Ollama Python library to connect to a remote LLM server, with generate, chat, and LangChain integration.
[Python] Setting Up a Python Dev Environment with uv and PyCharm
Setting up a Python project with the uv package manager and configuring the development environment in PyCharm.
[Swagger] Building Swagger UI for Korean Law Open API with Vercel Deployment
Writing an OpenAPI Spec for Korea’s Legislative Service Open API, building Swagger UI documentation, deploying it to Vercel, and resolving Mixed Content issues with a Rewrites proxy.
[MCP] Building an MCP Server for Scapple Diagrams
I built an MCP server that lets AI assistants read, write, and render Scapple files directly.
[Jekyll] Auto-Apply Lightbox (Magnific Popup) to Markdown Images
Fix the issue where clicking markdown images in Minimal Mistakes theme doesn’t trigger lightbox, using jQuery auto-wrapping.
[LLM] Setting Up Ollama Remote Access
Configuring the OLLAMA_HOST environment variable and Windows Firewall to access a local LLM from other devices on the same network.
[LLM] Running Qwen3:8B with Ollama on Windows 11
A complete guide to installing Ollama and running the Qwen3:8B model locally on Windows 11.
[Docker] Docker Compose GHCR Auth and Milvus Volume Initialization
Resolving GHCR private image authentication errors and RocksDB WAL volume conflicts when running a Milvus stack with Docker Compose.
[iOS] Integrating Machine Learning Models into iOS Apps with Core ML Tools
How to convert a PyTorch model to Core ML format using Core ML Tools and integrate it into an iOS app.
[Git] Syncing Configuration Files with Git Using Symbolic Links
How to version-control configuration files in a Git repository using symbolic links.
[macOS] Building a Claude Code Voice Assistant in the Small Hours
Building a macOS assistant demo that relays Claude Code CLI’s input and output through voice on a sleepless night
[Code Quality] Building Automated PR Code Review with Claude
A story of building automated GitHub PR review with Claude Code Action for a side project.
[iOS] Placing and Rotating Circular Menu Items with Trigonometry
How to place and rotate circular menu items using sin, cos, and atan2 in iOS.
[Jekyll] Implementing Multilingual Support (KO/EN/JA) Without Plugins
Sharing the experience of implementing Korean, English, and Japanese support in a Jekyll blog with the Minimal Mistakes theme — without any plugins.
[iOS] Modular Architecture with CocoaPods Private Spec Repos
How to modularize an iOS project into layered modules using CocoaPods Private Spec Repos.
[macOS] Building a Claude Code Monitor with Claude Code
Sharing the experience of building a macOS menu bar app that monitors Claude Code’s own usage — using Claude Code itself.
[Xcode] Setting Up MCP Servers for the Agentic Coding Assistant
A guide to connecting MCP servers to the Xcode agentic coding assistant.
[Xcode] Using Claude Opus 4.6 in Xcode 26.3
How to configure Xcode 26.3 to use the Claude Opus 4.6 model as an agentic coding assistant.
[Java] Installing OpenJDK
How to install Eclipse Temurin OpenJDK on macOS using Homebrew.
[Ruby] Displaying Gem Paths in Bundle
How to check gem paths in Bundler.
[Ruby] Installing Ruby
How to install Ruby using rbenv on macOS.
[Jekyll] Changing Word Break Properties in the Minimal Mistakes Theme
How to change word break properties in the Minimal Mistakes theme to fix horizontal scrolling on mobile.
[CI/CD] Disabling fastlane Update Check and Changelog Logs
How to disable fastlane’s update check log and changelog log.
[Jekyll] Running a Local Server with a Specific IP and Port
How to run a Jekyll local server with a specific IP address and port.
[CI/CD] Creating a fastlane Plugin
How to create and distribute a custom fastlane Plugin.
[CI/CD] Creating a fastlane Action
How to create a custom fastlane Action.
[CI/CD] Using fastlane Plugins
How to add and manage fastlane plugins.
[Python] Installing PIP
How to install PIP, the package manager for Python 3.
[CI/CD] Installing fastlane
How to install fastlane on macOS.
[Git] Using Multiple SSH Keys on GitHub
How to use multiple SSH keys on GitHub.
[Apple] Keynote - September 14, 2021
A summary of the new devices and services announced at the Apple September 2021 keynote.
[Xcode] Building for iOS 15 Devices with Xcode 12
How to deploy builds to iOS 15 or iPadOS 15 devices using Xcode 12.
[Git] Installing Git LFS
How to install and set up Git LFS on macOS.
[Ruby] Installing Homebrew
How to install Homebrew on macOS.
[CocoaPods] Installing CocoaPods
How to install CocoaPods on macOS.
[Objective-C] Class and Method, Instance
A summary of classes, methods, and instances in Objective-C.
[Objective-C] Branch Statements
A summary of branch statements in Objective-C.
[Objective-C] Loop Statements
A summary of loop statements in Objective-C.
[Spring] Setting Up a Spring 5 Development Environment
How to set up a Spring 5 development environment.
[Objective-C] Operators and Expressions
A summary of operators and expressions in Objective-C.
[Objective-C] Primitive Data Types
A summary of primitive data types in Objective-C.
[Objective-C] Study Resource Collections
A curated list of useful study resources for learning Objective-C.
[iOS] Handling the iOS 13 View Controller Modal Presentation Style Change
How to handle the default Modal Presentation Style change introduced in iOS 13.
macOS
[macOS] Setting iTerm2 as the Default Terminal in Alfred
How to configure Alfred to use iTerm2 instead of the default Terminal.app when running terminal commands.
[macOS] Recording Microphone and System Audio Together with QuickTime Player
How to record both microphone input and system audio simultaneously in QuickTime Player using BlackHole.
[macOS] Building a Claude Code Voice Assistant in the Small Hours
Building a macOS assistant demo that relays Claude Code CLI’s input and output through voice on a sleepless night
[macOS] Building a Claude Code Monitor with Claude Code
Sharing the experience of building a macOS menu bar app that monitors Claude Code’s own usage — using Claude Code itself.
[macOS] Setting Up Obsidian MCP Integration
How to set up an MCP server so Claude Code can directly read and write to your Obsidian vault.
[macOS] Fixing Visual Studio Code’s code Shell Command Not Working on macOS 12.3
A guide on how to fix the issue where VS Code’s code command stops working due to the removal of Python 2 in macOS 12.3.
[macOS] Copying a Path in Finder
The keyboard shortcut for copying a file or folder path in macOS Finder.
[macOS] Fixing the Spaces Order
How to fix the order of Spaces in Mission Control on macOS.
[macOS] Opening Visual Studio Code from the Command Line
How to open Visual Studio Code from the terminal on macOS.
[macOS] Installing the Alfred TimeZones Workflow
How to install and use the Alfred TimeZones Workflow on macOS.
[macOS] Generating SSH Keys
How to generate SSH keys on macOS using ssh-keygen.
[macOS] Installing the Zsh Autosuggestions Plugin
How to install the zsh-autosuggestions plugin on macOS.
[macOS] Installing the Zsh Alien Theme
How to install the Alien theme for Oh My Zsh on macOS.
[macOS] Installing Oh My Zsh
How to install Oh My Zsh on macOS.
Language
[Python] Setting Up a Python Dev Environment with uv and PyCharm
Setting up a Python project with the uv package manager and configuring the development environment in PyCharm.
[Java] Installing OpenJDK
How to install Eclipse Temurin OpenJDK on macOS using Homebrew.
[Ruby] Displaying Gem Paths in Bundle
How to check gem paths in Bundler.
[Ruby] Installing Ruby
How to install Ruby using rbenv on macOS.
[Python] Installing PIP
How to install PIP, the package manager for Python 3.
[Ruby] Installing Homebrew
How to install Homebrew on macOS.
[Objective-C] Class and Method, Instance
A summary of classes, methods, and instances in Objective-C.
[Objective-C] Branch Statements
A summary of branch statements in Objective-C.
[Objective-C] Loop Statements
A summary of loop statements in Objective-C.
[Objective-C] Operators and Expressions
A summary of operators and expressions in Objective-C.
[Objective-C] Primitive Data Types
A summary of primitive data types in Objective-C.
[Objective-C] Study Resource Collections
A curated list of useful study resources for learning Objective-C.
PC
[macOS] Setting iTerm2 as the Default Terminal in Alfred
How to configure Alfred to use iTerm2 instead of the default Terminal.app when running terminal commands.
[macOS] Recording Microphone and System Audio Together with QuickTime Player
How to record both microphone input and system audio simultaneously in QuickTime Player using BlackHole.
[macOS] Setting Up Obsidian MCP Integration
How to set up an MCP server so Claude Code can directly read and write to your Obsidian vault.
[macOS] Fixing Visual Studio Code’s code Shell Command Not Working on macOS 12.3
A guide on how to fix the issue where VS Code’s code command stops working due to the removal of Python 2 in macOS 12.3.
[macOS] Copying a Path in Finder
The keyboard shortcut for copying a file or folder path in macOS Finder.
[macOS] Fixing the Spaces Order
How to fix the order of Spaces in Mission Control on macOS.
[macOS] Opening Visual Studio Code from the Command Line
How to open Visual Studio Code from the terminal on macOS.
[macOS] Installing the Alfred TimeZones Workflow
How to install and use the Alfred TimeZones Workflow on macOS.
[macOS] Generating SSH Keys
How to generate SSH keys on macOS using ssh-keygen.
[macOS] Installing the Zsh Autosuggestions Plugin
How to install the zsh-autosuggestions plugin on macOS.
[macOS] Installing the Zsh Alien Theme
How to install the Alien theme for Oh My Zsh on macOS.
[macOS] Installing Oh My Zsh
How to install Oh My Zsh on macOS.
AI
[Claude Code] Building a Real-Time Agent Dashboard
How I built a real-time monitoring dashboard to visualize what 19 Claude Code subagents are doing – from a failed Gather Town experiment to a practical WebSocket-powered control center.
[Claude Code] Designing an Expert Team with Subagents
How to build an expert team from planning to deployment by combining Claude Code’s Subagents, Skills, Rules, Hooks, and MCP Servers.
[Kiro] MCP Server Configuration
A guide on how to configure and manage MCP servers in Kiro, with practical examples.
[Kiro] Agent Configuration
A guide covering agent creation, configuration, prompt modularization, and sub-agent usage in Kiro.
[Kiro] CLI Installation and Settings
A guide on how to install Kiro CLI and the key configuration options in the cli.json settings file.
[Kiro] Kiro x Claude: 3-Tier AI Service Architecture
An analysis of how Kiro calls Claude models through a Client Layer + 3-Tier Service Layer, and why the same model delivers different performance depending on the App Provider.
[LLM] HyDE — Hypothetical Document Embeddings
An overview of HyDE (Hypothetical Document Embeddings), a technique for improving retrieval quality in RAG.
[LLM] LangChain Core Concepts — LCEL, Prompt Templates, Message Classes
An overview of LangChain’s LCEL, prompt templates, message classes, MessagesPlaceholder, and RunnableGenerator.
[LLM] Integrating LLMs with the Ollama Python Library
Using the Ollama Python library to connect to a remote LLM server, with generate, chat, and LangChain integration.
[MCP] Building an MCP Server for Scapple Diagrams
I built an MCP server that lets AI assistants read, write, and render Scapple files directly.
[LLM] Setting Up Ollama Remote Access
Configuring the OLLAMA_HOST environment variable and Windows Firewall to access a local LLM from other devices on the same network.
[LLM] Running Qwen3:8B with Ollama on Windows 11
A complete guide to installing Ollama and running the Qwen3:8B model locally on Windows 11.
Apple
[iOS] Integrating Machine Learning Models into iOS Apps with Core ML Tools
How to convert a PyTorch model to Core ML format using Core ML Tools and integrate it into an iOS app.
[macOS] Building a Claude Code Voice Assistant in the Small Hours
Building a macOS assistant demo that relays Claude Code CLI’s input and output through voice on a sleepless night
[iOS] Placing and Rotating Circular Menu Items with Trigonometry
How to place and rotate circular menu items using sin, cos, and atan2 in iOS.
[iOS] Modular Architecture with CocoaPods Private Spec Repos
How to modularize an iOS project into layered modules using CocoaPods Private Spec Repos.
[macOS] Building a Claude Code Monitor with Claude Code
Sharing the experience of building a macOS menu bar app that monitors Claude Code’s own usage — using Claude Code itself.
[Xcode] Setting Up MCP Servers for the Agentic Coding Assistant
A guide to connecting MCP servers to the Xcode agentic coding assistant.
[Xcode] Using Claude Opus 4.6 in Xcode 26.3
How to configure Xcode 26.3 to use the Claude Opus 4.6 model as an agentic coding assistant.
[Apple] Keynote - September 14, 2021
A summary of the new devices and services announced at the Apple September 2021 keynote.
[Xcode] Building for iOS 15 Devices with Xcode 12
How to deploy builds to iOS 15 or iPadOS 15 devices using Xcode 12.
[CocoaPods] Installing CocoaPods
How to install CocoaPods on macOS.
[iOS] Handling the iOS 13 View Controller Modal Presentation Style Change
How to handle the default Modal Presentation Style change introduced in iOS 13.
Playground
[SmartHome] DIY Presence Detection with Thin-Film Contact Sensor and Zigbee Door Sensor Mod
Modifying a Sonoff SNZB-04 Zigbee door sensor by wiring a thin-film contact sensor to its reed switch for chair and kitchen mat presence detection automation.
[SmartHome] DIY LAN Wiring and TV Cable Management After Moving
Fixing cut LAN ports, crimping RJ45 connectors, and organizing TV cables after my parents moved to a new apartment.
[SmartHome] Hyundai Wallpad RS485-WiFi Converter Replacement Review
A review of replacing the existing Raspberry Pi + RS485 TO USB setup with an RS485-WiFi converter to improve maintainability for controlling a Hyundai Communication wallpad with Home Assistant.
[Synology] Setting Up an L2TP/IPSec VPN Server
A guide to setting up an L2TP/IPSec VPN server on a Synology NAS and connecting from outside.
[Router] How to Enable HTTPS on ASUS Router Settings Page
A guide on how to enable HTTPS for the ASUS router settings page.
[Synology] Manually Renewing SSL Certificates via Command Line
A guide on how to manually renew SSL certificates on a Synology NAS.
[SmartHome] SmartThings Hub 3rd Generation Purchase Review
A review of purchasing the SmartThings Hub v3.
[SmartHome] Planning a Convenient and Comfortable Smart Home
A summary of the plan for building a convenient and comfortable smart home infrastructure.
[Synology] Connecting a Custom Domain to Photo Station
A guide on how to connect a custom domain to Synology Photo Station.
Agentic Coding Assistant
[Claude Code] Building a Real-Time Agent Dashboard
How I built a real-time monitoring dashboard to visualize what 19 Claude Code subagents are doing – from a failed Gather Town experiment to a practical WebSocket-powered control center.
[Claude Code] Designing an Expert Team with Subagents
How to build an expert team from planning to deployment by combining Claude Code’s Subagents, Skills, Rules, Hooks, and MCP Servers.
[Kiro] MCP Server Configuration
A guide on how to configure and manage MCP servers in Kiro, with practical examples.
[Kiro] Agent Configuration
A guide covering agent creation, configuration, prompt modularization, and sub-agent usage in Kiro.
[Kiro] CLI Installation and Settings
A guide on how to install Kiro CLI and the key configuration options in the cli.json settings file.
[Kiro] Kiro x Claude: 3-Tier AI Service Architecture
An analysis of how Kiro calls Claude models through a Client Layer + 3-Tier Service Layer, and why the same model delivers different performance depending on the App Provider.
[MCP] Building an MCP Server for Scapple Diagrams
I built an MCP server that lets AI assistants read, write, and render Scapple files directly.
Objective-C
[Objective-C] Class and Method, Instance
A summary of classes, methods, and instances in Objective-C.
[Objective-C] Branch Statements
A summary of branch statements in Objective-C.
[Objective-C] Loop Statements
A summary of loop statements in Objective-C.
[Objective-C] Operators and Expressions
A summary of operators and expressions in Objective-C.
[Objective-C] Primitive Data Types
A summary of primitive data types in Objective-C.
[Objective-C] Study Resource Collections
A curated list of useful study resources for learning Objective-C.
CS
[Code Quality] Building Automated PR Code Review with Claude
A story of building automated GitHub PR review with Claude Code Action for a side project.
[CI/CD] Disabling fastlane Update Check and Changelog Logs
How to disable fastlane’s update check log and changelog log.
[CI/CD] Creating a fastlane Plugin
How to create and distribute a custom fastlane Plugin.
[CI/CD] Creating a fastlane Action
How to create a custom fastlane Action.
[CI/CD] Using fastlane Plugins
How to add and manage fastlane plugins.
[CI/CD] Installing fastlane
How to install fastlane on macOS.
Software Engineering
[Code Quality] Building Automated PR Code Review with Claude
A story of building automated GitHub PR review with Claude Code Action for a side project.
[CI/CD] Disabling fastlane Update Check and Changelog Logs
How to disable fastlane’s update check log and changelog log.
[CI/CD] Creating a fastlane Plugin
How to create and distribute a custom fastlane Plugin.
[CI/CD] Creating a fastlane Action
How to create a custom fastlane Action.
[CI/CD] Using fastlane Plugins
How to add and manage fastlane plugins.
[CI/CD] Installing fastlane
How to install fastlane on macOS.
SmartHome
[SmartHome] DIY Presence Detection with Thin-Film Contact Sensor and Zigbee Door Sensor Mod
Modifying a Sonoff SNZB-04 Zigbee door sensor by wiring a thin-film contact sensor to its reed switch for chair and kitchen mat presence detection automation.
[SmartHome] DIY LAN Wiring and TV Cable Management After Moving
Fixing cut LAN ports, crimping RJ45 connectors, and organizing TV cables after my parents moved to a new apartment.
[SmartHome] Hyundai Wallpad RS485-WiFi Converter Replacement Review
A review of replacing the existing Raspberry Pi + RS485 TO USB setup with an RS485-WiFi converter to improve maintainability for controlling a Hyundai Communication wallpad with Home Assistant.
[SmartHome] SmartThings Hub 3rd Generation Purchase Review
A review of purchasing the SmartThings Hub v3.
[SmartHome] Planning a Convenient and Comfortable Smart Home
A summary of the plan for building a convenient and comfortable smart home infrastructure.
CI/CD
[CI/CD] Disabling fastlane Update Check and Changelog Logs
How to disable fastlane’s update check log and changelog log.
[CI/CD] Creating a fastlane Plugin
How to create and distribute a custom fastlane Plugin.
[CI/CD] Creating a fastlane Action
How to create a custom fastlane Action.
[CI/CD] Using fastlane Plugins
How to add and manage fastlane plugins.
[CI/CD] Installing fastlane
How to install fastlane on macOS.
LLM
[LLM] HyDE — Hypothetical Document Embeddings
An overview of HyDE (Hypothetical Document Embeddings), a technique for improving retrieval quality in RAG.
[LLM] LangChain Core Concepts — LCEL, Prompt Templates, Message Classes
An overview of LangChain’s LCEL, prompt templates, message classes, MessagesPlaceholder, and RunnableGenerator.
[LLM] Integrating LLMs with the Ollama Python Library
Using the Ollama Python library to connect to a remote LLM server, with generate, chat, and LangChain integration.
[LLM] Setting Up Ollama Remote Access
Configuring the OLLAMA_HOST environment variable and Windows Firewall to access a local LLM from other devices on the same network.
[LLM] Running Qwen3:8B with Ollama on Windows 11
A complete guide to installing Ollama and running the Qwen3:8B model locally on Windows 11.
iOS
[iOS] Integrating Machine Learning Models into iOS Apps with Core ML Tools
How to convert a PyTorch model to Core ML format using Core ML Tools and integrate it into an iOS app.
[iOS] Placing and Rotating Circular Menu Items with Trigonometry
How to place and rotate circular menu items using sin, cos, and atan2 in iOS.
[iOS] Modular Architecture with CocoaPods Private Spec Repos
How to modularize an iOS project into layered modules using CocoaPods Private Spec Repos.
[iOS] Handling the iOS 13 View Controller Modal Presentation Style Change
How to handle the default Modal Presentation Style change introduced in iOS 13.
Blog
[Jekyll] Auto-Apply Lightbox (Magnific Popup) to Markdown Images
Fix the issue where clicking markdown images in Minimal Mistakes theme doesn’t trigger lightbox, using jQuery auto-wrapping.
[Jekyll] Implementing Multilingual Support (KO/EN/JA) Without Plugins
Sharing the experience of implementing Korean, English, and Japanese support in a Jekyll blog with the Minimal Mistakes theme — without any plugins.
[Jekyll] Changing Word Break Properties in the Minimal Mistakes Theme
How to change word break properties in the Minimal Mistakes theme to fix horizontal scrolling on mobile.
[Jekyll] Running a Local Server with a Specific IP and Port
How to run a Jekyll local server with a specific IP address and port.
Jekyll
[Jekyll] Auto-Apply Lightbox (Magnific Popup) to Markdown Images
Fix the issue where clicking markdown images in Minimal Mistakes theme doesn’t trigger lightbox, using jQuery auto-wrapping.
[Jekyll] Implementing Multilingual Support (KO/EN/JA) Without Plugins
Sharing the experience of implementing Korean, English, and Japanese support in a Jekyll blog with the Minimal Mistakes theme — without any plugins.
[Jekyll] Changing Word Break Properties in the Minimal Mistakes Theme
How to change word break properties in the Minimal Mistakes theme to fix horizontal scrolling on mobile.
[Jekyll] Running a Local Server with a Specific IP and Port
How to run a Jekyll local server with a specific IP address and port.
Kiro
[Kiro] MCP Server Configuration
A guide on how to configure and manage MCP servers in Kiro, with practical examples.
[Kiro] Agent Configuration
A guide covering agent creation, configuration, prompt modularization, and sub-agent usage in Kiro.
[Kiro] CLI Installation and Settings
A guide on how to install Kiro CLI and the key configuration options in the cli.json settings file.
[Kiro] Kiro x Claude: 3-Tier AI Service Architecture
An analysis of how Kiro calls Claude models through a Client Layer + 3-Tier Service Layer, and why the same model delivers different performance depending on the App Provider.
Server
[Swagger] Building Swagger UI for Korean Law Open API with Vercel Deployment
Writing an OpenAPI Spec for Korea’s Legislative Service Open API, building Swagger UI documentation, deploying it to Vercel, and resolving Mixed Content issues with a Rewrites proxy.
[Docker] Docker Compose GHCR Auth and Milvus Volume Initialization
Resolving GHCR private image authentication errors and RocksDB WAL volume conflicts when running a Milvus stack with Docker Compose.
[Spring] Setting Up a Spring 5 Development Environment
How to set up a Spring 5 development environment.
Synology
[Synology] Setting Up an L2TP/IPSec VPN Server
A guide to setting up an L2TP/IPSec VPN server on a Synology NAS and connecting from outside.
[Synology] Manually Renewing SSL Certificates via Command Line
A guide on how to manually renew SSL certificates on a Synology NAS.
[Synology] Connecting a Custom Domain to Photo Station
A guide on how to connect a custom domain to Synology Photo Station.
Ruby
[Ruby] Displaying Gem Paths in Bundle
How to check gem paths in Bundler.
[Ruby] Installing Ruby
How to install Ruby using rbenv on macOS.
[Ruby] Installing Homebrew
How to install Homebrew on macOS.
SCM
[Git] Syncing Configuration Files with Git Using Symbolic Links
How to version-control configuration files in a Git repository using symbolic links.
[Git] Using Multiple SSH Keys on GitHub
How to use multiple SSH keys on GitHub.
[Git] Installing Git LFS
How to install and set up Git LFS on macOS.
Git
[Git] Syncing Configuration Files with Git Using Symbolic Links
How to version-control configuration files in a Git repository using symbolic links.
[Git] Using Multiple SSH Keys on GitHub
How to use multiple SSH keys on GitHub.
[Git] Installing Git LFS
How to install and set up Git LFS on macOS.
Xcode
[Xcode] Setting Up MCP Servers for the Agentic Coding Assistant
A guide to connecting MCP servers to the Xcode agentic coding assistant.
[Xcode] Using Claude Opus 4.6 in Xcode 26.3
How to configure Xcode 26.3 to use the Claude Opus 4.6 model as an agentic coding assistant.
[Xcode] Building for iOS 15 Devices with Xcode 12
How to deploy builds to iOS 15 or iPadOS 15 devices using Xcode 12.
Writing
[Column] The Age of Building and Selling Apps Is Over
In an era where non-developers can build their own services, what happens to the client services of traditional software companies? I dare to predict the future I see.
[Column] Running a Tech Blog in the AI Era
Running a trilingual blog when your Japanese doesn’t go beyond travel phrases. How AI has transformed the way tech blogs are run.
[Column] ‘We Can’t Build It Without a Developer’ No Longer Holds
AI coding tools have completely reshaped developer scarcity. Where does a developer’s value lie now?
Column
[Column] The Age of Building and Selling Apps Is Over
In an era where non-developers can build their own services, what happens to the client services of traditional software companies? I dare to predict the future I see.
[Column] Running a Tech Blog in the AI Era
Running a trilingual blog when your Japanese doesn’t go beyond travel phrases. How AI has transformed the way tech blogs are run.
[Column] ‘We Can’t Build It Without a Developer’ No Longer Holds
AI coding tools have completely reshaped developer scarcity. Where does a developer’s value lie now?
Python
[Python] Setting Up a Python Dev Environment with uv and PyCharm
Setting up a Python project with the uv package manager and configuring the development environment in PyCharm.
[Python] Installing PIP
How to install PIP, the package manager for Python 3.
Claude Code
[Claude Code] Building a Real-Time Agent Dashboard
How I built a real-time monitoring dashboard to visualize what 19 Claude Code subagents are doing – from a failed Gather Town experiment to a practical WebSocket-powered control center.
[Claude Code] Designing an Expert Team with Subagents
How to build an expert team from planning to deployment by combining Claude Code’s Subagents, Skills, Rules, Hooks, and MCP Servers.
Spring
[Spring] Setting Up a Spring 5 Development Environment
How to set up a Spring 5 development environment.
Fundamental
[Mathematics] Prime Numbers and Composite Numbers
An overview of the concepts of prime numbers and composite numbers.
Mathematics
[Mathematics] Prime Numbers and Composite Numbers
An overview of the concepts of prime numbers and composite numbers.
CocoaPods
[CocoaPods] Installing CocoaPods
How to install CocoaPods on macOS.
Event
[Apple] Keynote - September 14, 2021
A summary of the new devices and services announced at the Apple September 2021 keynote.
Router
[Router] How to Enable HTTPS on ASUS Router Settings Page
A guide on how to enable HTTPS for the ASUS router settings page.
Java
[Java] Installing OpenJDK
How to install Eclipse Temurin OpenJDK on macOS using Homebrew.
Code Quality
[Code Quality] Building Automated PR Code Review with Claude
A story of building automated GitHub PR review with Claude Code Action for a side project.
Docker
[Docker] Docker Compose GHCR Auth and Milvus Volume Initialization
Resolving GHCR private image authentication errors and RocksDB WAL volume conflicts when running a Milvus stack with Docker Compose.
MCP
[MCP] Building an MCP Server for Scapple Diagrams
I built an MCP server that lets AI assistants read, write, and render Scapple files directly.
Swagger
[Swagger] Building Swagger UI for Korean Law Open API with Vercel Deployment
Writing an OpenAPI Spec for Korea’s Legislative Service Open API, building Swagger UI documentation, deploying it to Vercel, and resolving Mixed Content issues with a Rewrites proxy.