What Are Claude Code Mods and How Do They Work #ClaudeCode #Tutorial

What Are Claude Code Mods and How Do They Work #ClaudeCode #Tutorial

Claude Code mods, hands-on: the four mods running on my own Claude Code, how to install one and switch it off, how to check a mod with claude plugin validate before you install it, and how to have Claude write one for you. A mod is a plugin with code that Claude Code runs inside itself, so it can draw in the interface where a settings hook can't.

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What you will see in this 3-minute breakdown: → A real run on Claude Code 2.1.296: /plugin shows "4 mods active", and my usage-meter mod writes 5-hour, 7-day and context usage under the prompt, with a pop-up at 80% and a sound at 97% → What a mod is: a plugin with JavaScript or TypeScript event handlers that Claude Code calls on a tool call, a submitted prompt, or a part of the interface being drawn. One "modules" key in the plugin's hooks/hooks.json makes it a mod → Mods vs settings hooks: a settings hook runs as a command outside Claude Code and can stop a tool call, but only a mod can add a pane or a band to the screen. My studio-hud band picked up a render check the moment Claude ran it → Install with /plugin install plugin-name@marketplace (mods need Claude Code v2.1.287 or later). Switch one off in the Installed tab of /plugin with Space. For one session without installed mods, start with --safe-mode, which turns off your other customizations too → Check before you install: claude plugin validate lists every event a mod hooks and every call it makes, without running it. Look for calls like $.process.run, which starts programs as you → Let Claude write one: describe the mod in a session, Claude writes it with the built-in plugin-authoring skill into ~/.claude/dev-mods/, you enable hot reloading for the session, and you copy the folder out to keep it → Test it offline: claude plugin test runs a mod's tests with no session, sign-in or network. All five usage-meter tests pass

Claude Code docs, Mods overview (install, /plugin, --safe-mode, validate): https://code.claude.com/docs/en/plugins/mods/overview Claude Code docs, Create a mod (modules key, plugin-authoring, hot reloading, dev-mods): https://code.claude.com/docs/en/plugins/mods/create Claude Code docs, Test a mod (claude plugin test): https://code.claude.com/docs/en/plugins/mods/test Claude Code docs, Manage mods (the calls to look for): https://code.claude.com/docs/en/plugins/mods/admin Claude Code docs, Mods reference (events): https://code.claude.com/docs/en/plugins/mods/reference Claude Code docs, Install plugins (enable or disable with Space): https://code.claude.com/docs/en/plugins/install Claude Code docs, CLI reference (--safe-mode): https://code.claude.com/docs/en/cli-reference Claude Code docs, Status line (5-hour and 7-day usage): https://code.claude.com/docs/en/statusline Claude Code changelog (2.1.287, Claude Mods): https://code.claude.com/docs/en/changelog Our Claude Code mods launch Short: https://youtu.be/tTe7GOJuc0E

Which would you build first: a usage warning, or a slash command of your own?

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