How to Install and Build Claude Code Mods: A Setup Guide
Learn how Claude Code's new mods system works and how to install five practical examples for context tracking, UI, and workflow automation.
What are Claude Code mods?
Claude Code mods are small plugins that change how the Claude Code desktop app or CLI looks and behaves. They ship inside Claude’s existing plugin system, so you install them with the /plugin command, and once installed they can add UI elements, pop-ups, buttons, or automated checks directly inside your coding sessions. Anthropic introduced them with official examples like a context-usage display and a “preview before delete” safety feature, and the system is flexible enough that anyone can describe a mod in plain English and have Claude build it.
TL;DR
- Mods are plugins for Claude Code that you install with the
/plugincommand in the CLI or desktop app, and they can modify the UI or add new automated behaviors. - You can build a mod with natural language by just telling Claude what you want it to do differently and letting it write the plugin code for you.
- Anthropic’s own examples include a context meter called token weather, a delete-preview feature called blast radius, and a step-by-step edit replay tool called replay theater.
- A Claude Code engineer built and shared a popular mod called next steps, which surfaces three suggested actions at the end of each turn instead of leaving you to guess what to do next.
- Community-built mods demonstrated in this guide include a cache and cost tracker, a sensitive-data blurring mode for screen recording, a visual progress tracker for
/goalprompts, and a file collision warning system. - Because mods live in local plugin files, they’re easy to toggle on and off with slash commands, and you can layer several of them in the same session.
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How do you install a Claude Code mod?
Installation is intentionally low-friction. Mods ship inside plugins, and you add them using the /plugin command inside the Claude Code CLI or desktop app. For many of the ready-made mods circulating since launch, the process is as simple as copying a block of instructions and pasting it into a Claude Code session with a prompt like “set up this mod.” Claude reads the instructions, writes the necessary plugin code, and the new UI element or behavior shows up in that same chat within roughly 30 seconds.
Because mods are just code living in your local plugin files, you can inspect them, edit them, or ask Claude to modify them later. If a mod stops being useful or starts cluttering your interface, you turn it off with a slash command the same way you turned it on.
How do you build your own mod from scratch?
You don’t need to code one yourself. Open Claude Code, update to the latest version, and describe the behavior you want changed or added. A useful first step, demonstrated by one builder, is asking Claude to scan your own session logs, identify repetitive tasks or patterns in how you use Claude Code, and suggest mod ideas based on that history. This turns mod creation into a feedback loop: Claude studies your actual workflow and proposes fixes for the friction it finds, rather than you guessing what might help.
From there, you refine the suggestions, pick the ones that solve real problems, and ask Claude to build and wire them up. Once a mod exists, managing it is just a matter of asking “how do I turn this on or off” and following the slash command it gives you.
What are the five example mods worth setting up first?
Cache and cost tracker. Claude Code caches your conversation so new messages don’t reprocess the full context at full cost, but that cache expires after a set window (around 60 minutes) if you go quiet. This mod displays a live countdown of how much cache time is left, shows current context size in tokens, tracks session and weekly usage limits, and estimates what the session would cost under API billing if the cache expired. It also includes a one-click button to run a session handoff (a context-reset skill) and clear the window, so you avoid long-context slowdowns commonly called context rot. When the cache is close to expiring, it proactively notifies you so you can re-prompt or compact the session before losing the discount.
Recording mode for sensitive data. This mod blurs out things like email addresses, account details, or financial figures whenever “record mode” is switched on, which is useful for anyone capturing screen recordings or screenshots for tutorials or demos. Turning it on is a slash command; turning it off is the same command with an “off” flag. Claude still reads and processes the real data normally, it just masks it visually in the interface so sensitive information never appears on screen.
Goal progress tracker. For anyone running /goal prompts (multi-step autonomous tasks), it can be hard to tell how far along a session is or how much longer it will run. This mod adds a visual UI that shows the current phase (planning, in-progress, complete), elapsed time, and a breakdown of every task Claude has generated for that goal, with checkmarks as each one finishes. If multiple goal sessions are running at once, the mod can show all of them in a single view instead of forcing you to tab between chats.
Next steps. Built by a Claude Code engineer and shared as one of the more popular community mods, this one adds a small panel at the end of each turn suggesting two or three concrete next actions based on what just happened, plus an option to dismiss it if you’d rather direct the session yourself. It’s most useful in software or automation work, where Claude can recommend things like fixing a specific bug next or merging a particular change, functioning as a lightweight project guide rather than a strict requirement.
Collision guard. This mod checks, before every file edit or write, whether that file was already modified within the last 30 minutes, which matters if you’re running multiple Claude Code sessions or agents against the same project. If a collision is detected, it surfaces a prompt asking whether you want to proceed anyway, move the work to a separate branch or worktree, cancel, or specify something else. Unlike a hook that silently blocks or auto-approves an action, this mod interrupts you with a decision point in the UI, which keeps parallel agents from quietly overwriting each other’s work.
Are Claude Code mods worth setting up?
For anyone running long Claude Code sessions, tracking API costs, or managing multiple parallel agents, mods solve real annoyances with very little setup effort. The cache tracker and collision guard in particular address problems that otherwise require manually checking token counts or remembering which chat touched which file. The next-steps and goal-tracking mods are more about workflow visibility, useful if you’re the kind of user who runs long autonomous tasks and wants a sense of progress without constantly checking in.
The main risk is UI clutter. Stacking several mods at once can mean a lot of panels and notifications competing for attention, so it’s worth starting with one or two that solve problems you actually have rather than installing everything that looks interesting on social media.
Frequently Asked Questions
What is the difference between a Claude Code mod and a plugin?
Mods are the features themselves (a UI element, a notification, a new behavior) and they ship inside the plugin system. In practice “installing a mod” and “installing a plugin” refer to the same action, done with the /plugin command.
Do I need to know how to code to build a Claude Code mod?
No. You describe the behavior you want in plain English, and Claude Code writes the plugin code for you. You can also ask it to explain how to turn the mod on or off afterward.
Can mods see or expose sensitive information?
Mods like the recording-mode example are built specifically to blur sensitive content such as emails or financial figures from the visible UI, though Claude still processes the underlying data normally to complete your request.
Will mods slow down my Claude Code sessions?
Plans first. Then code.
Remy writes the spec, manages the build, and ships the app.
The mods described here are lightweight UI additions and checks, not heavy background processes, so they’re not expected to meaningfully affect performance. Running many at once mainly affects how cluttered your interface feels, not session speed.
Where do Claude Code mods get installed?
They live in local plugin files tied to your Claude Code setup, which is why they can be toggled on and off with slash commands and customized or removed at any time.
