[IDEA] - Enable "Plan Mode" for Claude Code with Command-Line Flag

I’ve been using a workflow where I pipe input into Claude through STDIN, like:

bun lint | claude "Let's get through these linting warnings."
git diff --staged | claude "Hi, take a look at this diff and let's pick back up where we left off."

It would be useful to have an option, like --plan or --mode plan, that allows me to start a session directly in "plan mode" from the outset. This would help streamline the process, letting me focus on planning without needing to manually switch modes once in the session.