Default terminal uses bash instead of user's default shell (zsh)

Description

When Claude Code spawns a terminal/shell, it defaults to bash instead of respecting the user's configured default shell. On macOS, the default shell is zsh, and many users have their environment, PATH, and tool configurations set up in zsh profile files (.zshrc, .zprofile, etc.).

Problem

• Claude Code's Bash tool uses bash as the default shell
• Users whose default shell is zsh find that CLI tools (e.g., claude itself, and other tools installed via Homebrew, nvm, etc.) are not available because the zsh login profile hasn't been sourced
• Workaround: explicitly run /bin/zsh --login to get a proper environment, but this shouldn't be necessary

Expected Behavior

Claude Code should detect and use the user's default shell (e.g., via $SHELL environment variable or dscl on macOS), or at minimum source the appropriate shell profile so that the user's PATH and tool configurations are available.

Environment

• macOS (Darwin)
• Default shell: zsh
• Claude Code Bash tool defaults to bash

Workaround

Prefix commands with /bin/zsh --login -c '...' or run /bin/zsh --login first.