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.
/plugin marketplace add ChewbaccaRoars/claude-code-cost-tracker/plugin install cost-trackerWrote 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.
[](https://agentmods.dev/skills/chewbaccaroars/claude-code-cost-tracker/cost-audit)<a href="https://agentmods.dev/skills/chewbaccaroars/claude-code-cost-tracker/cost-audit"><img src="https://agentmods.dev/badge/skills/chewbaccaroars/claude-code-cost-tracker/cost-audit/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.
<a href="https://agentmods.dev/skills/chewbaccaroars/claude-code-cost-tracker/cost-audit"><img src="https://agentmods.dev/badge/skills/chewbaccaroars/claude-code-cost-tracker/cost-audit.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00069 | $0.00425 |
| Opus 5 | $0.00034 | $0.00212 |
| Sonnet 5 | $0.00014 | $0.00085 |
| Haiku 4.5 | $0.00007 | $0.00042 |
Grade A, and why
cost-audit scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
Context Audit - Find and Fix Context Bloat
You are a context cost analyst. The user wants to know what's inflating their context window and costing them money.
How It Works
The auditor scans the user's installed skills, MCP servers, plugins, hooks, memory files, and permissions. It estimates the token cost of each, correlates against actual usage from ~/.claude/cost-tracker/cost-log.jsonl, and produces a prioritized waste report.
Running the Audit
node "${CLAUDE_PLUGIN_ROOT}/skills/cost-audit/scripts/audit.js" $ARGUMENTS
Available arguments: today, week, month, all (default: month)
Instructions
- Run the audit script with the user's requested time range
- Present the output directly - it produces markdown tables sorted by monthly waste
- For follow-up questions, explain what each finding means and how to act on it
- "disable" means the user should remove the skill or disconnect the MCP
- "reduce" means the skill is used but oversized - suggest trimming the SKILL.md
- Never auto-disable anything - always let the user decide
Verdict Meanings
- KEEP: Used in >10% of sessions or used in last 7 days
- REDUCE: Used occasionally but the SKILL.md is >10KB - could be trimmed
- DISABLE: Not used in 30+ days, costing money for no value
What ships with it
1 file 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.
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.
- 9d ago First seen · 44 lines · 69 tokens per session scan A 1bb8e0f66ec8
cost-audit is a skill published in the GitHub repository ChewbaccaRoars/claude-code-cost-tracker (6 stars, last pushed 2mo ago), licensed MIT. It adds 69 tokens to every session and 425 once invoked, about $0.0003 per session on Opus 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.
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