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kubert is a CLI tool that provides per-shell Kubernetes context isolation by creating temporary, isolated kubeconfig files for each terminal session. Unlike kubectx/kubens which modify global configs, kubert prevents accidental cross-cluster commands by spawning isolated subshells with dedicated configs. Key features include multi-cluster command execution, context protection for production environments, shell hooks for terminal customization, and automatic cleanup. Written in Go as an alternative to kubie (Rust), it supports installation via Homebrew or Go, offers fzf integration for interactive selection, and can be configured via YAML or environment variables.