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This blog covers practical AI notes, engineering culture/decision-making, and occasional thought pieces.

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• Topics: pillar-ai / pillar-engineering / pillar-mkdocs
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Latest Articles

Weekly / Monthly digests

June 2026

• Claude Fable 5 Launch: What General Availability of a Mythos-Class Model Means - 2026.06.10
• Rethinking Harness Engineering through Core and Shell - 2026.06.03
• Before expanding Codex beyond engineers, decide who owns the output - 2026.06.03

May 2026

• Audit Log Design Before AI Adoption Increases Operating Cost - 2026.05.31
• Distributing Agent Skills: One Standard, Many Delivery Layers - 2026.05.31
• Why AI Adoption Stops at PoC: Separate Specification from Operations - 2026.05.30
• Fix fragile Excel PDF and PowerPoint files before giving them to AI - 2026.05.30
• Codex Now Supports Remote Control on Windows: Your Phone Becomes a Console for a Windows Dev Machine - 2026.05.30
• Separate AI Decisions From Human Decisions in Enterprise AI - 2026.05.29
• How to start Codex automation where humans only review PRs - 2026.05.26
• GitHub's 3,800 Internal Repository Breach: How a VS Code Extension Became the Entry Point - 2026.05.20
• RAG Quality Depends on Ranking: Rerankers as a Way to Reread Search Results - 2026.05.20
• Claude Code at Scale Vol. 1: Redirect to Japanese Article - 2026.05.17
• Amazon Bedrock Architecture for Enterprise: Where Models Run, Where Data Flows, and How Custom Models Fit - 2026.05.15
• Codex Web Response Latency Has Worsened in Measurable Public Signals Since May 2026 - 2026.05.13
• Enterprise AI Belongs in the Decision Loop, Not Just on a Dashboard - 2026.05.11
• Measuring AI Review Value with Copilot Code Review Metrics: KPI Design by security and bug_risk - 2026.05.09
• Are Pull Requests Outdated? Three Change-Management Options for the AI Agent Era - 2026.05.08
• What Is Codex /goal? How It Replaces \"Keep Going\" Prompts - 2026.05.05
• The Current State of Harness Engineering Terminology — A Map as of April 2026 - 2026.05.01

April 2026

• The AI-Surfaced Linux Kernel Vulnerability “Copy Fail”: CVE-2026-31431 Impact and Response Guide - 2026.04.30
• LLM Wiki Architecture: Karpathy's Markdown Knowledge Base Pattern Explained - 2026.04.29
• A Beginner's Guide to Three RAG Architectures: Classic RAG, Graph RAG, and Agentic RAG - 2026.04.26
• How NTT, Fujitsu, and NEC Signal Different Enterprise AI Strategies - 2026.04.26
• JSX Article Publishing PoC: Put a React Visual Article Under Blog - 2026.04.24
• Claude Code's Quality Drop Was Not Imaginary: 3 Causes from Anthropic's Official Postmortem - 2026.04.24
• Recursive Language Models Explained: Moving Long Context into an External Environment - 2026.04.24
• gh-stack Explained: Why Branching Strategy Changes in the Age of AI Multi-Agent Development - 2026.04.18
• What Is Claude Mythos? Why Anthropic Won't Release It Publicly - 2026.04.17
• Which Work Should AI Actually Handle? A Practical Guide to Business Application Design - 2026.04.14
• Where Does Value Move in the AI Era? From Using AI to Making AI Work - 2026.04.13
• Why Claude Code Burns Through Tokens So Fast — 3 Causes and the Cache Bug Confirmed by a Source Code Leak - 2026.04.01

March 2026

• OpenAI Releases Official Claude Code Plugin — What codex-plugin-cc Means - 2026.03.31
• Codex vs Claude Code: The Divergence in Subagent Design Philosophy - 2026.03.28
• What Is Harness Engineering—What Do You Actually Build? - 2026.03.27
• Azure Skills Plugin: A New Architecture That Injects 'Azure Judgment' into AI Coding Agents - 2026.03.27
• Did CLI Really Beat MCP? Deconstructing the Debate's Premises - 2026.03.23
• Skill Obsolescence Is Inevitable: Detection, Recovery, and Localization in Operations Design - 2026.03.20
• Don't Keep Specs—Connect Them - 2026.03.15
• Lessons from Amazon's Outage: What Organizations Moving Fast with AI Were Missing - 2026.03.12
• Why AI Coding Breaks Team Development — The Explosion of Local Optima and Machine-Readable Consensus - 2026.03.10
• Will Engineers Stop Growing in the AI Agent Era? — Research Data Reveals the Structure of Skill Atrophy and Talent Pipeline Collapse - 2026.03.05
• The Truth Behind +11% Software Engineer Job Postings — Not a Recovery, but a Transformation - 2026.03.04
• Automating the Claude Code × Codex Review Loop — Three Levels: SKILL.md, Plugin, and Pipeline - 2026.03.02

February 2026

• What Benchmarks Reveal About Cross-Model AI Coding: Why Combining Claude Code and Codex Beats Going All-In - 2026.02.28
• Trump Bans Anthropic from Federal Use — The Dispute and the Reality of OpenAI's Deal - 2026.02.28
• Breaking: Anthropic Launches Claude Code Security — AI Detects Code Vulnerabilities Like a Human Researcher - 2026.02.21
• When AI Can Teach You How to Use AI, What Are AI Courses Really Selling? - 2026.02.20
• Context Engineering: Comparing RAG, MCP, and Agent Skills — A 2026 Design Guide - 2026.02.19
• Claude Sonnet 4.6 Release — Opus-Level Performance at Nearly Half the Cost - 2026.02.18
• What Is OpenClaw? A Sober Look at the Viral Autonomous AI Agent - 2026.02.17
• Structuring the 'SaaS is Dead' Debate: What Dies and What Survives in the AI Agent Era - 2026.02.08
• Claude Opus 4.6 Complete Guide (Feb 2026) | Pricing, 1M Context, Benchmarks & Usage - 2026.02.06
• GPT-5.3-Codex Complete Guide | Terminal-Bench 77.3%, 25% Faster, Codex App Usage & Adoption Decisions - 2026.02.06
• Claude Agent Skills Not Triggering? The Problem is in Your Description: Complete Design Pattern Guide - 2026.02.02

January 2026

• Is the Age of MCP Over? Tool Integration Design in the Age of Skills Compilation - 2026.01.27
• SkillsMP Review 2026: What It Is, 1.6M+ SKILL.md Files, and How to Choose Safely - 2026.01.18
• Spec-Driven Development in the AI Era: Stop Stalling with Output Contracts - 2026.01.10
• Claude Code Vulnerability CVE-2025-64755 | Sed Command Validation Bypass Enables Arbitrary File Writes - 2026.01.09
• Claude Code Agent Swarms Complete Guide | 3x Development Efficiency with MCP Integration - 2026.01.03
• Claude Agent SDK Beginner Guide | The New Era of 10-Line Agent Creation - 2026.01.01

December 2025

• Agent Skills Installation Guide 2025: 10 Practical Examples + Safety Checklist - 2025.12.31
• Agent Skills in Practice: where it works, benefits, and how to measure - 2025.12.23
• Agent Skills Quickstart: pre-built vs SKILL.md in 3 minutes - 2025.12.23
• Agent Skills: Why SKILL.md Won't Load + Fix Guide - 2025.12.21
• The MCP vs Agent Skills Debate: Untangling the Category Error - 2025.12.17
• Breaking: GPT-5.2 Release - 400K Token Context & 30% Hallucination Reduction - 2025.12.11

November 2025

• Scrum × AI Coding: A Practical Guide to Spec Management in Agile Environments - 2025.11.29
• Should You Write Specs? 3 Patterns for Specification Management in AI Code Generation Era - 2025.11.28
• Claude Opus 4.5 Complete Guide - 76% Token Efficiency Improvement Balances Peak Accuracy and Cost Reduction - 2025.11.25
• Gemini 3 Agent Development Guide: Implementing thinking_level and Autonomous Execution - 2025.11.24
• Nano Banana Pro Complete Guide: 10 Use Cases for Google's Latest AI Image Generation [2025 Edition] - 2025.11.23
• Gemini 3 Pro In-Depth Review: Performance and Real-World Usage Analysis - 2025.11.18
• MCP Code Execution Deep Dive: Agent Design Achieving Up to 98.7% Token Cost Reduction with Code Execution with MCP - 2025.11.16
• Japan AI Basic Plan Complete Guide - 2025.11.13
• Claude Haiku 4.5 Practical Guide - Achieve Sonnet 4-Level Performance at ⅓ Cost - 2025.11.13
• Kimi K2 Thinking: Chinese Open-Source AI Surpasses GPT-5 in Key Benchmarks - 2025.11.13
• GPT-5.1 Complete Guide: Evolution from GPT-5 and Practical Selection Strategy - 2025.11.13
• Meta Ray-Ban Display Announcement: The Dawn of AI Agent Era Starting at $799 - 2025.11.13
• OpenAI Sora Android Release - The Official Launch of a Text-to-Video AI App - 2025.11.08
• OpenAI Codex CLI Updates (November 2025) Summary - 2025.11.01

October 2025

• AI Bubble Market Strategy Dashboard - 2025.10.17
• AI Era 'Readable Code Obsolescence' Practical Decision Guide - 2025.10.05
• The Deep Layers of the Readable Code Debate: Human Anxiety and Values Behind Technical Arguments [2025 Edition] - 2025.10.05
• The Full Picture of OpenAI Sora 2 Copyright Issues - Essential Countermeasures for Japanese Creators - 2025.10.03