magna-nz

Tallybook — Development skill for Claude Code

Development community

Prices your Claude Code and Codex sessions from the transcripts on disk and tells you, in plain English, what you overpaid for.

How to install Tallybook

This entry records only its repository, not the path inside it, so there is no exact command to give. Open magna-nz/tallybook and copy the folder into ~/.claude/skills/, or the file into ~/.claude/agents/.

What Tallybook does

Prices your Claude Code and Codex sessions from the transcripts on disk and tells you, in plain English, what you overpaid for.

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README

Tallybook

Shows you what you overpaid Claude Code and Codex CLI for.

Install · Use · Findings · Design

Why

You run Claude Code or Codex for hours and all you see at the end is a bill or a rate-limit warning. Tallybook prices every session from the transcripts already on your disk, shows what the money went on, and what it would have cost on a cheaper choice.

No proxy, no API key, nothing leaves your machine. The first run covers every session you already have.

What it looks like

$ tallybook

Scanned 131 sessions, 70 sub-agent runs (Aug 20 – Sep 10)

Last 30 days                          list price   share
  Total                                  $412.80    100%
  Main session turns                     $271.10     66%
  Sub-agents                             $141.70     34%

Top findings (estimated saving / month)

 1.  $58.00   Read-only sub-agents ran on Opus                 high confidence
 2.  $34.00   You asked for a cheaper model but g