Free guide
Ten useful Claude Code mod ideas, with a prompt to build each one
Short answer
A free guide to 10 Claude Code mods you can build in October 2026: a context meter, a risky command guard, a secret redactor, a cost tracker, an edit replay, a focus timer, a test status pane, a production guard, a session notes command, and a prompt helper, with prompts, tips, and safety rules.
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Mods are small JavaScript or TypeScript functions that change how Claude Code looks and behaves. They need Claude Code v2.1.287 or later in the terminal, and work in the desktop app’s Code tab too.
The easiest way to build one is to describe it in a Claude Code session. Claude writes the mod, loads it, and reloads it as you ask for changes.
Start small. A mod that does one thing well is a great first mod.
1 · Context meter
A band above the prompt that shows how full the context window is after each turn, so you know when to /compact or /clear.
Make a mod that shows context window usage as a percentage above the prompt, updated after every turn, yellow above 60% and red above 85%.
2 · Usage and cost tracker
A pane that totals tokens per session and turn, so you can spot expensive habits.
3 · Tool call counter
Shows how many tools Claude has used this turn, beside the spinner.
4 · Risky command guard
Holds commands such as rm -rf, git reset --hard, or a force push, and asks you to Proceed or Cancel. It is a safety net, not a replacement for permissions.
Make a mod that holds Bash commands matching rm -rf, git reset --hard, or git push --force, explains what they would change, and shows Proceed and Cancel buttons.
5 · Secret redactor
Hides API keys and tokens in tool output before Claude reads them.
6 · Production guard
Asks for confirmation before Claude edits files in folders such as config/production.
7 · Edit replay
A /replay command that steps through every file edit from the last turn, like Anthropic’s Replay Theater sample.
8 · Test status pane
Shows the latest test results in a pane after Claude runs your tests.
9 · Session notes command
A /note command that saves a line to a notes file instantly, without starting a Claude turn.
Make a mod that adds a /note command, which appends my text with the time to notes.md in this project, without a Claude turn.
10 · Focus timer
A band above the prompt with a 25-minute timer and a reminder to review Claude’s work when it ends.
Make a mod with a /focus command that starts a 25-minute timer shown above the prompt, then reminds me to review the changes.
Mods are plugins, so share them through a plugin marketplace in a Git repository, or submit them to the Claude directory.
Do not build a mod because you can. Build one that removes a small annoyance you hit every day.
Build the context meter today. It takes minutes and helps you save tokens every session.
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