What is cost-tracker?

A cost-reporting tool that reads recorded session data and summarizes Claude Code spending, token use, models, projects, and sessions.

Use it to report spending for today, a week, a month, all recorded time, a project, or a named session, and to compare model costs.

It provides cost information across sessions instead of making you inspect log files manually.

cost-tracker — Skill for Claude Code by ChewbaccaRoars

Install

Getting it into your agent

This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.

Claude Code

/plugin marketplace add ChewbaccaRoars/claude-code-cost-tracker

Claude Code

/plugin install cost-tracker

Made for: Claude Code.

Or install cost-tracker, the plugin that ships this one along with the rest of its 6 skills, 3 hooks.

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/skills/chewbaccaroars/claude-code-cost-tracker/cost-tracker/github.svg)](https://agentmods.dev/skills/chewbaccaroars/claude-code-cost-tracker/cost-tracker)

Your own site

<a href="https://agentmods.dev/skills/chewbaccaroars/claude-code-cost-tracker/cost-tracker"><img src="https://agentmods.dev/badge/skills/chewbaccaroars/claude-code-cost-tracker/cost-tracker/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/chewbaccaroars/claude-code-cost-tracker/cost-tracker"><img src="https://agentmods.dev/badge/skills/chewbaccaroars/claude-code-cost-tracker/cost-tracker.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 57 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 818 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found 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 5.1	$0.00057	$0.00818
Opus 5.5	$0.00023	$0.00327
Sonnet 5.5	$0.00011	$0.00164
Haiku 4.5	$0.00006	$0.00082

Measured 2mo ago against content hash 5e4c04152afc, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

cost-tracker 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 2mo ago.

The scan reads SKILL.md. This mod also ships 2 executable files (scripts/dashboard.js, scripts/report.js), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

plugins/cost-tracker/skills/cost-tracker/SKILL.md · 75 lines

How it starts

The opening of the file, as written. The whole thing — 75 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Cost Tracker - Cross-Session Spending Analysis

You are a cost analysis assistant. The user wants to see their Claude Code spending data.

Data Source

Cost data is logged automatically at ~/.claude/cost-tracker/cost-log.jsonl (one JSON line per session). Each entry contains:

timestamp, start_timestamp, end_timestamp, session_id, project, cwd
session_name: session name (set via /rename, null if not renamed)
session_category: auto-classified category (debug, build, review, refactor, test, docs, deploy, config)
models: per-model token breakdown (input_tokens, output_tokens, cache_creation_input_tokens, cache_read_input_tokens, message_count, cost_usd)
total_cost_usd: actual session cost
model_comparison: what this session would cost on opus, sonnet, haiku
peak_context_tokens: approximate peak context window usage

Report Helper (Terminal Output)

Run the report helper script for pre-formatted markdown output:

node "${CLAUDE_PLUGIN_ROOT}/skills/cost-tracker/scripts/report.js" $ARGUMENTS

Available arguments: today, week, month, all, compare, project:<name>, session:<name>

Visual Dashboard (HTML)

Generate and open an interactive HTML dashboard with charts and session history:

node "${CLAUDE_PLUGIN_ROOT}/skills/cost-tracker/scripts/dashboard.js"

The dashboard includes:

KPI cards: Total spend, today, 7-day, 30-day, cache efficiency, avg per session
Model comparison: What the same work would cost on Opus, Sonnet, and Haiku
Charts: Daily spend (color-coded by threshold), cost by day of week, sessions per day, cumulative spend
Session table: Searchable, filterable by cost range, sortable by date or cost, with session summaries
Cost amortization: Sessions spanning multiple days have costs distributed evenly across active days

Optional: specify a custom output path:

node "${CLAUDE_PLUGIN_ROOT}/skills/cost-tracker/scripts/dashboard.js" /path/to/output.html

Read the full file on GitHub · 75 lines

Files

What ships with it

2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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.

2mo ago First seen · 75 lines · 57 tokens per session scan A 5e4c04152afc

Subscribe to this mod's changes

cost-tracker is a skill published in the GitHub repository ChewbaccaRoars/claude-code-cost-tracker (6 stars, last pushed 4mo ago), licensed MIT. It adds 57 tokens to every session and 818 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Analytics and metrics

cost-tracker next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
cost-trackerChewbaccaRoars/claude-code-cost-tracker	Skill	6	4mo ago	MIT	A	57	Claude Code
imagegenopenai/codex	Skill	134k	today	Apache-2.0	A	113	Codex
playwright-climicrosoft/playwright	Skill	99k	yesterday	Apache-2.0	A	19	Claude Code
local-ai-agentsmicrosoft/ai-agents-for-beginners	Skill	79k	4d ago	MIT	A	200	Claude Code, Codex
systematic-debuggingobra/superpowers	Skill	314k	3d ago	MIT	A	21	Claude Code
next-cache-components-adoptionvercel/next.js	Skill	143k	yesterday	MIT	A	95	Claude Code
next-partial-prefetching-adoptionvercel/next.js	Skill	143k	yesterday	MIT	A	103	Claude Code