Cloud agents cannot be launched from a session that restricts personal config

CLAUDE_CODE_RESTRICT_PERSONAL_CONFIG is a new environment variable (a setting given to a program from the shell) that limits what your own Claude Code files can do in a session. When it is set, Claude Code refuses to launch a cloud agent, a helper that runs the work on a remote machine. The error explains that the cloud session would not apply those limits, and it tells you to set isolation to "worktree" instead. A worktree is a separate copy of your project on your own machine.