Developers wanted to resume Claude Code sessions so badly they built their own tooling for it. Shell hooks that save the session ID on exit. A published Ruby gem for bookmarking sessions by name. Custom zsh functions passed around like recipes. All of that engineering existed to preserve a single string. The sessions were never lost, which is what makes this a great product lesson. Claude Code stores every conversation as a JSONL file on disk, and the CLI could always resume them. The desktop…