Claude Code mod
hal-grammar-check
Grammar-check your prompt as you type, shown above the prompt box
Install
/plugin marketplace add vinta/hal-9000
/plugin install hal-grammar-check@hal-9000Mods install like plugins. Run /reload-plugins or start a new session to load it.
What it can access
- Reach
- L2Writes or runs: runs processes, drives Claude, reads mod state, draws
- Sees
- every prompt
- Draws in
AbovePrompt- Hooks
session.startprompt.editprompt.changeprompt.submitui.render
From a static scan of the mod's code by awesome-claude-code-mods. It shows what the code asks for, not a security review.
How Claude Code mods work
- A mod is a plugin with a JavaScript or TypeScript module that runs inside Claude Code (version 2.1.287 or later). It can draw panes beside the transcript, a band above the prompt, buttons and toasts, restyle the spinner and tool rows, and watch or rewrite tool calls and prompts.
- It installs like any plugin: add its marketplace with /plugin marketplace add owner/repo, then /plugin install name@marketplace.
- Check what a mod can reach before installing: it runs with your permissions. Reach goes from drawing only, to reading files, to writing files or running processes, to the network. Run claude plugin validate on a clone to list its hooks and calls without running it.
- Turn one off from the Installed tab in /plugin, or start Claude Code with --safe-mode to skip every customization for a session.
Details
- Repository
- vinta/hal-9000
- Folder
plugins/hal-grammar-check- Marketplace
hal-9000- Author
- Vinta Chen
- Website
- vinta.ws/code
- License
- MIT
- Last updated
- 31 October 2026
- Listed in
- awesome-claude-code-mods
FAQ
What is hal-grammar-check?
Grammar-check your prompt as you type, shown above the prompt box It is a mod for Claude Code, from vinta/hal-9000 on GitHub.
What can the hal-grammar-check mod access?
Its widest reach is "writes or runs" (runs processes, drives Claude, reads mod state, draws). It sees every prompt. It draws in AbovePrompt. Like any mod, it runs with your permissions.
How do I install hal-grammar-check?
Inside Claude Code (v2.1.287 or later), run /plugin marketplace add vinta/hal-9000 and then /plugin install hal-grammar-check@hal-9000.
Is hal-grammar-check popular?
vinta/hal-9000 has 142 GitHub stars and 0 forks, and is included in 1 curated Claude Code list. It was last updated on 31 October 2026.
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