A local report of Claude Code spending grouped by calendar month, with the newest months first. Claude Code is a coding assistant, and the report reads its existing local session logs.

Use it to review monthly spending for all projects or filter the totals by a project or branch name.

It shows monthly costs without contacting an API, needing a key, or adding prompts or network delay.

by-month — Command for coding agents by RoninForge: A local report of Claude Code spending grouped by…

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods

npx agentmods add commands/roninforge/claude-code-cost/by-month

Clone the repo

git clone --depth 1 https://github.com/RoninForge/claude-code-cost

Or install claude-code-cost, the plugin that ships this one along with the rest of its 5 commands.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/commands/roninforge/claude-code-cost/by-month.svg)](https://agentmods.dev/commands/roninforge/claude-code-cost/by-month)

Your own site

<a href="https://agentmods.dev/commands/roninforge/claude-code-cost/by-month"><img src="https://agentmods.dev/badge/commands/roninforge/claude-code-cost/by-month.svg" alt="Measured on agentmods" height="20"></a>

Per session 40 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 410 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

Origin 89% copy Near-identical to another mod in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5	$0.00040	$0.00410
Opus 5	$0.00020	$0.00205
Sonnet 5	$0.00008	$0.00082
Haiku 4.5	$0.00004	$0.00041

Measured 3d ago against content hash 013b72de2354, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

by-month scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

This is a copy

89% identical to by-day — 10 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

commands/by-month.md · 25 lines

What it actually says

Show the user their Claude Code spend broken down by month.

Run exactly this command with the Bash tool, passing the user's arguments through verbatim:

node "${CLAUDE_PLUGIN_ROOT}/scripts/cost.mjs" --mode by-month $ARGUMENTS

Then present the command's stdout to the user VERBATIM inside a fenced code block. Do not reformat the table, do not add columns, do not re-sort rows, and do not convert it to Markdown. Do not editorialize or add commentary about the numbers unless the user explicitly asks for analysis.

Notes for you (the model), not for the user:

Output is a MONTH SPEND table covering the last ~12 months, newest month first, with a TOTAL footer. Each row is labelled YYYY-MM (UTC). Only months with spend appear.
The script reads only the local JSONL session logs under ~/.claude/projects. It never touches API traffic: zero key, zero prompts, zero latency. This view always reads the raw logs directly (it does not use budgetclaw, which has no per-date data).
A first non-flag argument is a case-insensitive substring filter on project or branch name, scoping the monthly totals to that project/branch (for example /claude-code-cost:by-month roninforge).
--json makes it emit a JSON array of {period, spend} instead of the table.
If the output ends with a "Note:" line about unpriced models, keep it.
If the script prints "No Claude Code spend tracked yet." or "No Claude Code session logs found ...", relay that message as-is.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

3d ago First seen · 25 lines · 40 tokens per session scan A 013b72de2354

Subscribe to this mod's changes

by-month is a command published in the GitHub repository RoninForge/claude-code-cost (2 stars, last pushed 27d ago), licensed MIT. It adds 40 tokens to every session and 410 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. It is 89% identical to by-day, differing in 10 lines, and is treated as a copy.

Analytics and metrics anthropic claude-code claude-code-plugin cli cost-tracking developer-tools

by-month

Getting it into your agent

Wrote this? Show the measurements

What it costs to keep this loaded

Grade A, and why

Nothing flagged

This is a copy

What it actually says

What this file has done since we first saw it

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