Hah, yeah that's a total miss there.

Maybe it messed that up because writing bash scripts is so core to how Claude Code works? Much of the existing system prompt (and I bet a lot of the fine-tuning data) is about how to use the Bash tool.

For good measure, I tried:

    description: CRITICAL: Use when writing bash scripts

Surprisingly no effect either. I would've thought adding "CRITICAL" would somehow promote that instruction in the sea of context.

Try writing it like this: "Use it when creating a bash script or editing a bash script"