--- title: "Hisashi Hirajo (@hirajo) | Hashnode" description: "Hisashi Hirajo (@hirajo) writes on Hashnode. Read their latest articles and follow their work." url: "https://hashnode.com/@hirajo" --- @hirajo # Hisashi Hirajo @hirajo · Joined June 2025 ### [Claude Code Mistakes: It Changed My Product Without Asking (How I Stopped It)](https://hisashi.hashnode.dev/claude-code-mistakes-it-changed-my-product-without-asking-how-i-stopped-it?utm_source=hashnode&utm_medium=feed) It raised my app's minimum password length from 6 to 8 while building a comparison page. What the commit shows, what the official docs say, and the rule, test, question and hook I use to stop it. 15 min read · [hisashi.hashnode.dev](https://hisashi.hashnode.dev/claude-code-mistakes-it-changed-my-product-without-asking-how-i-stopped-it?utm_source=hashnode&utm_medium=feed) [1d ago](https://hashnode.com/posts/claude-code-mistakes-it-changed-my-product-without-asking-how-i-stopped-it/6af3c4f8d250fc626b7dbd7c) ### [Claude Code Limit Reached Too Fast? What Uses Up Your Usage, and What I Do About It](https://hisashi.hashnode.dev/claude-code-limit-reached-too-fast-what-uses-up-your-usage-and-what-i-do-about-it?utm_source=hashnode&utm_medium=feed) The 5-hour and weekly limits per plan as the official pages list them, why every message rereads the whole chat, five habits, the commands that show your usage, and what I did not test. 12 min read · [hisashi.hashnode.dev](https://hisashi.hashnode.dev/claude-code-limit-reached-too-fast-what-uses-up-your-usage-and-what-i-do-about-it?utm_source=hashnode&utm_medium=feed) [1d ago](https://hashnode.com/posts/claude-code-limit-reached-too-fast-what-uses-up-your-usage-and-what-i-do-about-it/6af3c4debc2b8fcbbe9138d3) ### [How I Run My Business With AI Employees on Claude Code, and the Three Files Behind It](https://hisashi.hashnode.dev/how-i-run-my-business-with-ai-employees-on-claude-code-and-the-three-files-behind-it?utm_source=hashnode&utm_medium=feed) One folder per job, and three files (CLAUDE.md, settings.json and a hook script) that turn every mistake into a rule a machine checks. 10 min read · [hisashi.hashnode.dev](https://hisashi.hashnode.dev/how-i-run-my-business-with-ai-employees-on-claude-code-and-the-three-files-behind-it?utm_source=hashnode&utm_medium=feed) [1](https://hashnode.com/posts/how-i-run-my-business-with-ai-employees-on-claude-code-and-the-three-files-behind-it/6af26efec43baca4ef240abf) [2d ago](https://hashnode.com/posts/how-i-run-my-business-with-ai-employees-on-claude-code-and-the-three-files-behind-it/6af26efec43baca4ef240abf) ### [Claude Code vs Codex: Which Is Better? I Use Both Every Day, and Here Is the Setup](https://hisashi.hashnode.dev/claude-code-vs-codex-which-is-better-i-use-both-every-day-and-here-is-the-setup?utm_source=hashnode&utm_medium=feed) Why comparison videos cannot decide it for you, the job or moment test, and the real files that let Claude Code call Codex for drawing, checking and a second opinion. 15 min read · [hisashi.hashnode.dev](https://hisashi.hashnode.dev/claude-code-vs-codex-which-is-better-i-use-both-every-day-and-here-is-the-setup?utm_source=hashnode&utm_medium=feed) [2d ago](https://hashnode.com/posts/claude-code-vs-codex-which-is-better-i-use-both-every-day-and-here-is-the-setup/6af26ee0e706925a8954d223) ### [Running Multiple Claude Code Sessions: How I Run 48 at Once, and the Five Rules That Keep Them From Colliding](https://hisashi.hashnode.dev/running-multiple-claude-code-sessions-how-i-run-48-at-once-and-the-five-rules-that-keep-them-from-colliding?utm_source=hashnode&utm_medium=feed) One chat per job, a CLAUDE.md per folder, a counter session, sessions that message each other by name, and a lock for anything there is only one of. 12 min read · [hisashi.hashnode.dev](https://hisashi.hashnode.dev/running-multiple-claude-code-sessions-how-i-run-48-at-once-and-the-five-rules-that-keep-them-from-colliding?utm_source=hashnode&utm_medium=feed) [3d ago](https://hashnode.com/posts/running-multiple-claude-code-sessions-how-i-run-48-at-once-and-the-five-rules-that-keep-them-from-colliding/6af13567c06d737e50fa9e37)