nushell-pro

Comprehensive Nushell scripting best practices, idioms, security, and evidence-driven code review. Use when writing, reviewing, auditing, debugging, or refactoring Nushell (.nu) scripts, modules, custom commands, pipelines, config, and tests. Also use for Bash/POSIX-to-Nushell conversion and Nu 0.114/0.115 migration issues such as stricter types, YAML 1.2, `external_arg`, `run`, SemVer, optional `nothing`, subprocess diagnostics, and explicit submodule imports.