Agent skill

Cost Track

Auto-capture per-session token usage from the Claude Code session jsonl and persist to the cost-tracking namespace

MITAuto-check: notesAI & LLM Engineering

Install Cost Track

skills CLI

$ npx skills add ruvnet/ruflo --skill cost-track -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install ruvnet/ruflo cost-track --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/ruvnet/ruflo.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/ruflo-cost-tracker/skills/cost-track .claude/skills/cost-track && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "cost-track" agent skill from https://github.com/ruvnet/ruflo/tree/main/plugins/ruflo-cost-tracker/skills/cost-track into .claude/skills/cost-track/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cost-track", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/ruvnet/ruflo/tree/main/plugins/ruflo-cost-tracker/skills/cost-track

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add ruvnet/ruflo --skill cost-track -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install ruvnet/ruflo cost-track --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/ruvnet/ruflo.git skills-src && mkdir -p .agents/skills && cp -r skills-src/plugins/ruflo-cost-tracker/skills/cost-track .agents/skills/cost-track && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "cost-track" agent skill from https://github.com/ruvnet/ruflo/tree/main/plugins/ruflo-cost-tracker/skills/cost-track into .agents/skills/cost-track/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cost-track", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add ruvnet/ruflo --skill cost-track -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install ruvnet/ruflo cost-track --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/ruvnet/ruflo.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/plugins/ruflo-cost-tracker/skills/cost-track .cursor/skills/cost-track && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "cost-track" agent skill from https://github.com/ruvnet/ruflo/tree/main/plugins/ruflo-cost-tracker/skills/cost-track into .cursor/skills/cost-track/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cost-track", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/ruvnet/ruflo.git --path plugins/ruflo-cost-tracker/skills/cost-track

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add ruvnet/ruflo --skill cost-track -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install ruvnet/ruflo cost-track --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/ruvnet/ruflo.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/plugins/ruflo-cost-tracker/skills/cost-track .gemini/skills/cost-track && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "cost-track" agent skill from https://github.com/ruvnet/ruflo/tree/main/plugins/ruflo-cost-tracker/skills/cost-track into .gemini/skills/cost-track/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cost-track", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install ruvnet/ruflo cost-track

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add ruvnet/ruflo --skill cost-track -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/ruvnet/ruflo.git skills-src && mkdir -p .github/skills && cp -r skills-src/plugins/ruflo-cost-tracker/skills/cost-track .github/skills/cost-track && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "cost-track" agent skill from https://github.com/ruvnet/ruflo/tree/main/plugins/ruflo-cost-tracker/skills/cost-track into .github/skills/cost-track/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cost-track", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add ruvnet/ruflo --skill cost-track -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install ruvnet/ruflo cost-track --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/ruvnet/ruflo.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/plugins/ruflo-cost-tracker/skills/cost-track .opencode/skills/cost-track && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "cost-track" agent skill from https://github.com/ruvnet/ruflo/tree/main/plugins/ruflo-cost-tracker/skills/cost-track into .opencode/skills/cost-track/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cost-track", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: cost-track
GitHub stars: 74k
Token cost: ~773 tokens
SKILL.md length: 264 words
Files: 1
Skills in repo: 264
Repo updated: Oct 9, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Auto-capture per-session token usage from the Claude Code session jsonl and persist to the cost-tracking namespace

Works in 3 steps: Run the tracker from the project root → Inspect the markdown summary — total… → Verify persistence —…
Tasks that involve LLM cost and token optimization
SKILL.md covers When to use, Steps, Record shape (in cost-tracking… and Pricing source of truth, plus 2 more sections
Calls node

What it does

Cost Track is an agent skill from ruvnet/ruflo. Auto-capture per-session token usage from the Claude Code session jsonl and persist to the cost-tracking namespace

Its SKILL.md is about 770 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in AI & LLM Engineering, covering LLM cost and token optimization. The repository describes itself as: 🌊 The original agent harness. Deploy intelligent multi-player swarms, coordinate autonomous workflows, and build conversational AI systems. Features adaptive memory…. The licence is MIT.

When your agent uses it

Tasks that involve LLM cost and token optimization

Example prompts

“/cost-track”

Requirements

Pre-approved tools (allowed-tools): Bash, mcp__plugin_ruflo-core_ruflo__memory_store

Workflow steps

3 steps, taken from the first numbered list in SKILL.md.

Run the tracker from the project root
Inspect the markdown summary — total cost, per-model and per-tier breakdowns, and the persisted memory key.
Verify persistence — mcpplugin_ruflo-core_ruflomemory_search --query "session-" --namespace cost-tracking should list the new record…

What it can do on your machine

Read from SKILL.md and the folder at commit 58e0ae7. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves these tools, so the agent can use them without asking each time:
- Bash
- mcp__plugin_ruflo-core_ruflo__memory_store
From allowed-tools in the SKILL.md frontmatter.
Runs code
Shell commands in SKILL.md call:
- node
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Cost Track loads about 773 tokens when it runs. Until then it costs about 31 tokens; SKILL.md has 264 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~31
When it runs · the whole SKILL.md, loaded when a task matches: ~773

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check: notes

The automated check noted patterns worth knowing about, such as sudo or a known installer.

NotePre-approves every shell command (allowed-tools: Bash)SKILL.md
```
allowed-tools: Bash, mcp__plugin_ruflo-core_ruflo__memory_store
```

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from ruvnet/ruflo at commit 58e0ae7, republished under its MIT licence (© ruvnet). 264 words, ~773 tokens.

Download SKILL.mdSave it as .claude/skills/cost-track/SKILL.md (or your agent's skills folder).

name: cost-track
description: Auto-capture per-session token usage from the Claude Code session jsonl and persist to the cost-tracking namespace
allowed-tools: Bash, mcp__plugin_ruflo-core_ruflo__memory_store

Cost Track

Reads the active Claude Code session jsonl (~/.claude/projects/<encoded-cwd>/<session>.jsonl), tallies assistant-message usage per model, computes USD cost using REFERENCE.md pricing, and writes a structured record to the cost-tracking AgentDB namespace. This is the producer that gives cost-report and cost-optimize real data to consume.

When to use

After a meaningful chunk of work, to capture spend for the report.
At session-end to persist the final tally.
Periodically during long sessions (cron-friendly — see /loop 30m).

Steps

Run the tracker from the project root:
bash
```
node plugins/ruflo-cost-tracker/scripts/track.mjs
```
The script auto-discovers the session jsonl from the current working directory. To pin a specific session: TRACK_SESSION=/path/to/session.jsonl. To dry-run (no memory write): TRACK_DRY_RUN=1.
Inspect the markdown summary — total cost, per-model and per-tier breakdowns, and the persisted memory key.
Verify persistence — mcp__plugin_ruflo-core_ruflo__memory_search --query "session-" --namespace cost-tracking should list the new record. cost-report step 1 reads from this namespace.

Record shape (in `cost-tracking` namespace)

Key: session-<sessionId>. Value (JSON):

json

{
  "sessionId": "1dba3b8c-...",
  "cwd": "/Users/cohen/Projects/ruflo",
  "startedAt": "2026-05-04T...",
  "endedAt": "2026-05-05T...",
  "messageCount": 234,
  "byModel": {
    "claude-opus-4-7": {
      "tier": "opus",
      "input_tokens": 12345,
      "output_tokens": 6789,
      "cache_creation_input_tokens": 800000,
      "cache_read_input_tokens": 2000000,
      "messages": 50,
      "cost_usd": 1.23
    }
  },
  "byTier": { "haiku": 0.0, "sonnet": 0.45, "opus": 1.23, "unknown": 0 },
  "total_cost_usd": 1.68,
  "capturedAt": "2026-05-05T..."
}

Pricing source of truth

The script's PRICING constant mirrors REFERENCE.md "Model pricing (USD per 1M tokens)". Update both together when prices change. Cache-write tokens are billed at cache_write rate; cache-read tokens at cache_read (per Anthropic billing docs).

Env overrides

Env	Default	Purpose
`TRACK_CWD`	`process.cwd()`	Override which project's sessions to scan
`TRACK_SESSION`	most-recent jsonl	Pin a specific session file
`TRACK_OUT`	unset	Also write the JSON summary to this path
`TRACK_DRY_RUN=1`	unset	Skip the `memory store` call
`TRACK_QUIET=1`	unset	Suppress markdown output
`TRACK_NAMESPACE`	`cost-tracking`	Override target namespace

Cross-references

cost-report (consumer) — reads records produced by this skill
REFERENCE.md "Cost attribution formula" — the math the script implements
cost-budget-check (consumer; landing in P2) — reads totals to evaluate alerts

Files

Just SKILL.md in plugins/ruflo-cost-tracker/skills/cost-track of ruvnet/ruflo.

Open the folder on GitHubat commit 58e0ae7

Compare with similar skills

Cost Track next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Cost Track compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Cost Track this skillruvnet/ruflo	74k	—	~773	Automated safety check: Notes	MIT	today
Context Compressionguanyang/open-agent-hub	977	2 repos	~4.6k	Automated safety check: Pass	MIT	yesterday
Bounty Hunter1sadjlk/bounty-hunter-skill	282	1 repos	~761	Automated safety check: Pass	MIT	7 mo ago
Skill Shortenerluongnv89/asm	954	—	~3.8k	Automated safety check: Notes	MIT	3 days ago
Fleet Auditoralexgreensh/token-optimizer	2.5k	—	~1.7k	Automated safety check: Pass	Custom licence	yesterday
Context Auditundefined-ui/second-brain-os	1k	—	~802	Automated safety check: Pass	MIT	yesterday

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Questions about Cost Track

What does Cost Track do?

Auto-capture per-session token usage from the Claude Code session jsonl and persist to the cost-tracking namespace. Cost Track is an agent skill from ruvnet/ruflo.

When should I use Cost Track?

Cost Track fits situations like: tasks that involve LLM cost and token optimization.

How do I install Cost Track in Claude Code?

Run `npx skills add ruvnet/ruflo --skill cost-track -a claude-code`. Or copy the skill folder (plugins/ruflo-cost-tracker/skills/cost-track in ruvnet/ruflo) into .claude/skills/cost-track in your project. Claude Code loads it when a task matches its description.

How do I install Cost Track in Codex?

Run `npx skills add ruvnet/ruflo --skill cost-track -a codex`. Or copy the skill folder (plugins/ruflo-cost-tracker/skills/cost-track in ruvnet/ruflo) into .agents/skills/cost-track in your project. Codex loads it when a task matches its description.

Can I use Cost Track in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add ruvnet/ruflo --skill cost-track -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/cost-track, .gemini/skills/cost-track, .github/skills/cost-track and .opencode/skills/cost-track in your project.

What does Cost Track need to run?

Going by SKILL.md and its folder, Cost Track needs the command-line tools its instructions call (node). Its frontmatter pre-approves these tools: Bash, mcp__plugin_ruflo-core_ruflo__memory_store.

Does Cost Track access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Cost Track safe to install?

Our automated static check of SKILL.md found notes only (pre-approves every shell command (allowed-tools: bash)), nothing it rates as a warning. It is not a guarantee. Review the folder before installing.

What licence does Cost Track use?

Cost Track is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Cost Track use?

About 773 tokens (SKILL.md is roughly 3.1k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Cost Track?

Skills that share tags, products or a category with Cost Track: Context Compression (guanyang/open-agent-hub, 977 stars), Bounty Hunter (1sadjlk/bounty-hunter-skill, 282 stars), Skill Shortener (luongnv89/asm, 954 stars) and Fleet Auditor (alexgreensh/token-optimizer, 2.5k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Cost Track?

ruvnet (a GitHub user) maintains it in ruvnet/ruflo, which has 74,159 GitHub stars. The repository holds 264 skills in this directory. The repository was last updated on October 9, 2026.

Source: ruvnet/ruflo on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Cost Track

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Cost Track

When to use

Steps

Record shape (in cost-tracking namespace)

Pricing source of truth

Env overrides

Cross-references

Files

Compare with similar skills

Similar skills

More from ruvnet/ruflo

Related

Questions about Cost Track

Record shape (in `cost-tracking` namespace)