feat: add shell completions (bash, zsh, fish)

[gitmpr]

Adds static completion scripts for tab autocompletion under shell-completions/:

• claude-completions.bash
• claude-completions.zsh
• claude-completions.fish

Note: If the claude binary supported integrated completions, users would simply be able to run:

source <(claude completion $SHELL)

as is common in many modern CLI tools.

Unfortunately, upstream integration isn’t possible. The client is not open source.

[dexxiez]

Would be good if the team took 3 minutes to run claude code on their project to make these into upstream. xoxox

[1160054]

Hi @gitmpr, thanks for working on shell completions for Claude Code!

I've also been working on a Zsh completion script and wanted to share it in case it's helpful:
https://github.com/1160054/claude-code-zsh-completion

Some features that might be worth considering:

• Multi-language support: Completion descriptions in 120+ languages
• Dynamic completions: Shows user's configured MCP servers when typing claude mcp remove <TAB>, installed plugins for claude plugin uninstall <TAB>, etc.
• Plugin manager support: Ready-to-use with zinit, antigen, sheldon, and Oh My Zsh

Feel free to use any parts of it if you find them useful. I'm happy to collaborate or contribute if needed.

[mishraprafful]

Cross-linking #62455 for visibility — it's a fresh feature request for tab completion inside bash mode (the ! prefix in the TUI), filed after #18637 was auto-closed for inactivity.

That's a different layer than this PR (which adds completion for the external claude command in the user's shell), but they're often conflated by people searching for the same problem, so worth keeping the threads connected.