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-lean)<a href="https://agentmods.dev/skills/chewbaccaroars/claude-code-cost-tracker/cost-lean"><img src="https://agentmods.dev/badge/skills/chewbaccaroars/claude-code-cost-tracker/cost-lean.svg" alt="Measured on agentmods" 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 | $0.00070 | $0.00437 |
| Opus 5 | $0.00035 | $0.00218 |
| Sonnet 5 | $0.00014 | $0.00087 |
| Haiku 4.5 | $0.00007 | $0.00044 |
Grade A, and why
cost-lean scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
cost-lean
Manage context profiles for lean sessions.
This skill helps you reduce context bloat by creating and managing profiles that selectively enable/disable MCP servers and skills based on actual usage patterns.
Usage
The skill runs: node "${CLAUDE_PLUGIN_ROOT}/skills/cost-lean/scripts/lean.js" $ARGUMENTS
Available Commands
- (no args) or status - Show current context load breakdown with token counts and costs for all skills/MCPs, plus what's currently disabled
- profiles - List all saved context profiles
- save - Save current active configuration as a named profile
- recommend - Analyze usage data and generate recommended profiles based on actual usage patterns (lean, recent, project-specific)
- restore - Restore full configuration (re-enable all skills/MCPs)
Workflow
- Run
recommendto see what you're actually using - Choose a recommended profile or save your own
- Tell the user to run
npx cost-lean --profile <name>before their next session to apply the profile - Profiles take effect on NEXT session start, not the current session
Examples
- "Show me my context load" → runs status
- "What profiles do I have?" → runs profiles
- "Save this as my work setup" → runs save work
- "Find what I actually use" → runs recommend
- "Go back to full config" → runs restore
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.
- 8d ago First seen · 51 lines · 70 tokens per session scan A 7d45d503d859
cost-lean is a skill published in the GitHub repository ChewbaccaRoars/claude-code-cost-tracker (6 stars, last pushed 2mo ago), licensed MIT. It adds 70 tokens to every session and 437 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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