Writing a Zsh completion for a custom CLI without slowing your shell
Zsh completions are shell functions registered with compdef and loaded from fpath. Use _arguments for declarative options and cache dynamic lookups to avoid shell lag.
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zshStop Memorizing Flags: Programmable Completion in Zsh with compdef and zstyle
Zsh's programmable completion lets you teach TAB what your internal tools accept. A worked example with compdef, _arguments, and zstyle, plus latency and security trade-offs.