Claude Code mod
cost-ledger
Tracks what Claude Code costs — session, calendar-week and calendar-month totals with the month's pace and week-over-week change, a /costs pane with a spend calendar, the most expensive prompts and what filled the context, plus prompt-cache awareness: a cache warm/cold countdown, warnings before a prompt, model switch or large write re-caches the context, a per-category breakdown priced at list or your own (e.g. AWS) rates, per-project and subagent splits, budget alerts, CSV export and a /costs doctor self-check, the cache lifetime learned from Claude Code's own pricing, what a cold re-cache will cost before you resume, and an optional keep-alive that holds the cache warm while a session sits idle
Install
/plugin marketplace add bobtat/claude-plugins
/plugin install cost-ledger@bobtat-pluginsMods install like plugins. Run /reload-plugins or start a new session to load it.
What it can access
- Reach
- L2Writes or runs: runs processes, writes files, drives Claude, reads files, reads env vars, reads mod state, persists state, draws
- Sees
- classic hooks, every prompt, every tool call
- Draws in
AbovePromptPane- Hooks
session.startclassic.SessionStartclassic.PreModelSwitchclassic.PostModelSwitchsession.endprompt.submitturn.startturn.stepturn.completetool.callsession.measurecommand.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
- bobtat/claude-plugins
- Folder
plugins/cost-ledger- Marketplace
bobtat-plugins- Author
- bobtat
- License
- MIT
- Last updated
- 30 October 2026
- Listed in
- awesome-claude-code-mods
FAQ
What is cost-ledger?
Tracks what Claude Code costs — session, calendar-week and calendar-month totals with the month's pace and week-over-week change, a /costs pane with a spend calendar, the most expensive prompts and what filled the context, plus prompt-cache awareness: a cache warm/cold countdown, warnings before a prompt, model switch or large write re-caches the context, a per-category breakdown priced at list or your own (e.g. AWS) rates, per-project and subagent splits, budget alerts, CSV export and a /costs doctor self-check, the cache lifetime learned from Claude Code's own pricing, what a cold re-cache will cost before you resume, and an optional keep-alive that holds the cache warm while a session sits idle It is a mod for Claude Code, from bobtat/claude-plugins on GitHub.
What can the cost-ledger mod access?
Its widest reach is "writes or runs" (runs processes, writes files, drives Claude, reads files, reads env vars, reads mod state, persists state, draws). It sees classic hooks, every prompt, every tool call. It draws in AbovePrompt, Pane. Like any mod, it runs with your permissions.
How do I install cost-ledger?
Inside Claude Code (v2.1.287 or later), run /plugin marketplace add bobtat/claude-plugins and then /plugin install cost-ledger@bobtat-plugins.
Is cost-ledger popular?
bobtat/claude-plugins has 2 GitHub stars and 0 forks, and is included in 1 curated Claude Code list. It was last updated on 30 October 2026.
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