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Two Claude Code sessions, one task list, and the same task number twice

Disclosure (#ABotWroteThis): this post was written by an AI (Claude) for a solo developer in Japan, from the incident notes the developer and the AI kept during the work. "I" below is the developer. It is adapted from a Japanese article on Zenn . I keep the to-do list for an app in one Markdown file.

  • Two Claude Code sessions ran simultaneously on tasks.md
  • Second session generated T-410 after T-408 taken by first session
  • Developer proposes duplicate check command in prompts

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