Claude Code mod
cache-tax
How well the prompt cache works and what the cache tax costs: hit %, cost and the money paid above all-cache-read, per turn, with cache-bust alerts.
Install
/plugin marketplace add gauravruhela07/claude-mods
/plugin install cache-tax@claude-modsMods install like plugins. Run /reload-plugins or start a new session to load it.
What it can access
- Reach
- L1Reads: reads mod state, persists state, draws
- Draws in
Pane- Hooks
session.startsession.endturn.stepturn.completecommand.runui.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
- gauravruhela07/claude-mods
- Folder
cache-tax- Marketplace
claude-mods- Author
- gauravruhela07
- Last updated
- 12 October 2026
- Listed in
- awesome-claude-code-mods
FAQ
What is cache-tax?
How well the prompt cache works and what the cache tax costs: hit %, cost and the money paid above all-cache-read, per turn, with cache-bust alerts. It is a mod for Claude Code, from gauravruhela07/claude-mods on GitHub.
What can the cache-tax mod access?
Its widest reach is "reads" (reads mod state, persists state, draws). It draws in Pane. Like any mod, it runs with your permissions.
How do I install cache-tax?
Inside Claude Code (v2.1.287 or later), run /plugin marketplace add gauravruhela07/claude-mods and then /plugin install cache-tax@claude-mods.
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Warns before a prompt that would reload a cold prompt cache, with a token and cost estimate; /keepwarm keeps it warm.
cache-clock
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Shows above the prompt how long the prompt cache stays warm, the cache hit rate, context use and plan limits, with a compact button. No model calls.
cache-timer
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Shows how long the prompt cache stays warm, as a dim Cache mm:ss countdown in the footer of Claude Code Desktop, restarted by each model response of the main thread. The cache lifetime (5 minutes or 1 hour, per account) is learned from the responses: a cache read after more than five idle minutes means one hour, a full rewrite means five; until then the countdown shows ~ and assumes five
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simplybychris/claude-code-mods
One colored line above the prompt: the prompt cache countdown, context fill, and the plan's 5-hour and weekly usage.
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Prompt cache hit rate for the last request, and whether the cache is still warm with a countdown, above the prompt
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