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cost-lean

cost-lean is a skill for Claude Code from ChewbaccaRoars/claude-code-cost-tracker. It costs 70 tokens per session (437 once invoked), scanned A, original, MIT.

A context-management tool for choosing which coding-agent skills and connected services are enabled in a session. Context is the information loaded for the agent, and reducing it can make a session smaller.

In plain words
What is it for?
Use it to inspect context usage, list or save profiles, get recommendations, restore the full setup, and manage lean-session configurations.
Why use it?
It helps identify and disable unused context so a session loads only the tools it needs.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

Runs only inside its plugin — its command needs a path that Claude Code sets for a plugin’s own hooks and for nothing else. Install the plugin, not this.

Part of the cost-tracker plugin — 6 skills, 3 hooks shipped together

not rated 6repo 4mo ago A scan 70 tokens original MIT

Good fit Use it to inspect context usage, list or save profiles, get recommendations, restore the full setup, and manage lean-session configurations.

Compare 6 skills from other repositories ↓
View source ↗ ChewbaccaRoars/claude-code-cost-tracker
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.

agentmods badge for cost-lean

README.md
[![agentmods](https://agentmods.dev/badge/skills/chewbaccaroars/claude-code-cost-tracker/cost-lean/github.svg)](https://agentmods.dev/skills/chewbaccaroars/claude-code-cost-tracker/cost-lean)
Your own site
<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/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.

agentmods 80×15 button for cost-lean

Your own site · 80×15
<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="Reviewed on agentmods" width="80" height="20"></a>
Per session 70 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 437 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00070 $0.00437
Opus 5.5 $0.00028 $0.00175
Sonnet 5.5 $0.00014 $0.00087
Haiku 4.5 $0.00007 $0.00044

Measured 2mo ago against content hash 7d45d503d859, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

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 2mo ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/lean.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-lean/SKILL.md · 51 lines

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

  1. Run recommend to see what you're actually using
  2. Choose a recommended profile or save your own
  3. Tell the user to run npx cost-lean --profile <name> before their next session to apply the profile
  4. 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
Files

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.

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.

  1. 2mo ago First seen · 51 lines · 70 tokens per session scan A 7d45d503d859

Subscribe to this mod's changes

cost-lean is a skill published in the GitHub repository ChewbaccaRoars/claude-code-cost-tracker (6 stars, last pushed 4mo ago), licensed MIT. It adds 70 tokens to every session and 437 once invoked, about $0.0003 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.

Building agentsMemory and context
Related

cost-lean compared with skills from other repositories

cost-lean next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
cost-leanChewbaccaRoars/claude-code-cost-trackerSkill64mo agoMITA70Claude Code
knowledge-ingestopenclaw/openclawSkill394ktodayMITA80Claude Code, Codex
mem0-oss-to-platformmem0ai/mem0Skill69ktodayApache-2.0A217Claude Code, Codex
forgetasgeirtj/system_prompts_leaksSkill71k2d agoCC0-1.0A74Claude Code, Codex
Cortexdanielmiessler/LifeOSSkill20kyesterdayMITA184Claude Code
memoryopensquilla/opensquillaSkill7.1k6d agoApache-2.0A44Claude Code, Codex
ha-data-storesshiwenwen/hope-agentSkill1.9kyesterdayMITA115Claude Code, Codex