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tallybook

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SUMMARY

Prices your Claude Code and Codex sessions from the transcripts on disk, shows what each agent cost over any period, and tells you in plain English what would have been cheaper. CLI, Browser UI and MCP server.

README.md
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Tallybook

Prices every Claude Code and Codex session on your disk, shows what each agent cost over any period, and tells you in plain English what would have been cheaper.

CI Latest release MCP server MIT License Glama Quality

Documentation


No proxy, no API key, nothing leaves your machine. Run it as a CLI, open the same report in your
browser with tallybook --serve, or add tallybook-mcp to Claude Code or Codex and ask the agent
itself what it's spending and what would be cheaper.

tallybook --serve: the same report in your browser
In your browser · tallybook --serve

tallybook in the terminal: the report, a week-on-week comparison, and spend by sub-agent
In your terminal · tallybook

More in the documentation.

Install

brew install --cask magna-nz/tap/tallybook

Also available via go install github.com/magna-nz/tallybook/cmd/tallybook@latest, or as a
release download. Works on macOS, Linux
and Windows.

Add the MCP server so your agent can check its own spend mid-session — tallybook-mcp ships
alongside tallybook, so no separate install:

claude mcp add tallybook -- tallybook-mcp   # Claude Code

For Codex, add it to ~/.codex/config.toml:

[mcp_servers.tallybook]
command = "tallybook-mcp"

Use

tallybook                         # this period's report: the five biggest findings
tallybook --serve                 # the same report, findings and sessions in your browser, on localhost
tallybook findings                # every finding, grouped by what kind of change it asks for
tallybook --since 7d --compare    # this week against last week: spend, sessions, cache hit rate
tallybook finding 1               # finding #1 in full: what happened, why, what to change
tallybook finding 1 --evidence    # the same, with the sessions behind it
tallybook finding 1 --patch       # finding #1's fix, as an applyable diff
tallybook agents                  # spend by sub-agent type, with the model and effort each ran at
tallybook sessions --sort cost    # sessions ranked by what they cost
tallybook changes                 # did a past model swap actually save money?
tallybook setup hook              # record sessions automatically as they end

Docs

The command reference, the MCP server's tools, configuration, and the privacy model live on the
documentation site.

License

MIT

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