All Articles
The Mastering Claude's Custom Instructions
Master the design, implementation, and optimization of Claude's custom instructions to unlock AI's full potential. From fundamentals to production-ready strategies.
Four Places My MCP Agent Broke — Measuring Aggregation Tools, Fake Parallelism, and Input Validation
The implementation holes I hit while running MCP servers and agent workflows as a solo developer, with numbers measured on my own machine: boundary values in aggregation tools, parallelism that quietly runs serially, brittle JSON parsing, and the limits of blocklist-style input validation.
Running Claude's Message Batches Overnight — What the 50% Discount Actually Covers
What I learned running Claude API Message Batches for real: what the 50% discount covers, the custom_id character restriction, and designing around the 24-hour window and 29-day retention.
Automate App Store Connect with Claude in Chrome — Metadata, Reviews, and ASO Optimization
Learn how to use Claude in Chrome with App Store Connect to automate iOS app metadata updates, review replies, and ASO optimization. A practical guide for indie developers looking to cut down on store management overhead.
Monetizing SaaS with Claude API: Your Roadmap to ¥100K Monthly
A practical guide to building a profitable SaaS business using the Claude API. Learn pricing design, user acquisition, API cost optimization, and a roadmap to reaching your first ¥100K/month.
Claude Keeps Switching to English: How to Fix Language Response Issues
Frustrated when Claude switches to English mid-conversation? This guide explains why it happens and how to permanently fix language response issues using system prompts, Projects settings, and CLAUDE.md.
Claude Mythos Preview and Project Glasswing: What the Published Numbers Actually Say
A sourced walkthrough of Claude Mythos Preview and Project Glasswing using only figures Anthropic has published: 10,000+ vulnerabilities, the patching bottleneck, and a measured repository-scanning implementation you can run today with generally available models.
Migrating from OpenAI to the Claude API: Code Conversion to Zero-Downtime Production Rollout (2026)
How to migrate from OpenAI GPT-4 to the Claude API: authentication, message-format conversion, streaming, tool use, error handling, and a zero-downtime phased rollout, all with full implementation code.
The Boundaries That Trip You Up Moving Claude Managed Agents to Production — Agent / Environment / Session, and Keeping Keys Out of the Sandbox
A production design walkthrough for Claude Managed Agents, checked against the SDK's actual type definitions. Covers which object owns sandbox control, persistent memory, credentials, delegation, and cost measurement.
How to Fix Claude API 401 Invalid API Key Authentication Error
Complete guide to fixing Claude API 401 Invalid API Key errors. Covers environment variable issues, expired keys, OAuth token corruption, proxy interference, and more with step-by-step solutions.
Running Claude Code and GitHub Copilot Together — Different Philosophies, Practical Division of Labor
Claude Code and GitHub Copilot are built on different philosophies, and their strengths barely overlap. Here is how their limits compare across real implementation scenarios, and how to run both in one workflow.
Claude Code × Docker — DevContainers, Multi-Stage Builds, and Production Deployment
A practical guide to production-grade development workflows combining Claude Code and Docker. From DevContainer setup and multi-stage build optimization to GitHub Actions CI/CD and Kubernetes deployment — with practical code examples throughout.