How do I install the Model Usage skill?

Run npx skillmds@latest add promisingcoder/model-usage in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Model Usage safe to use?

SkillMD's automated safety review verdict for this skill is PASS. Independent scanners report: SkillSpector: PASS, Skill Scanner: PASS. Capability flags: executes scripts, makes network calls. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Model Usage?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Model Usage free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Model Usage?

promisingcoder (@promisingcoder) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Model Usage by promisingcoder — Agent Skill

Name: Model Usage
Rating: 4.2 (5 reviews)
Author: promisingcoder

File contents

Model usage

Overview

Get per-model usage cost from CodexBar's local cost logs. Supports "current model" (most recent daily entry) or "all models" summaries for Codex or Claude.

Live CodexBar CLI invocation is currently documented for macOS only. The bundled Python summarizer is portable: if you already have exported CodexBar JSON, --input mode works anywhere Python is available.

Quick start

Fetch cost JSON via CodexBar CLI or pass a JSON file.
Use the bundled script to summarize by model.

python {baseDir}/scripts/model_usage.py --provider codex --mode current
python {baseDir}/scripts/model_usage.py --provider codex --mode all
python {baseDir}/scripts/model_usage.py --provider claude --mode all --format json --pretty

Current model logic

Uses the most recent daily row with modelBreakdowns.
Picks the model with the highest cost in that row.
Falls back to the last entry in modelsUsed when breakdowns are missing.
Override with --model <name> when you need a specific model.

Inputs

Default: runs codexbar cost --format json --provider <codex|claude>.
macOS: use the bundled CodexBar CLI install path above for live local usage reads.
Linux/other platforms: use --input with exported CodexBar JSON until this skill documents a supported local CodexBar install path for that platform.
File or stdin:

codexbar cost --provider codex --format json > /tmp/cost.json
python {baseDir}/scripts/model_usage.py --input /tmp/cost.json --mode all
cat /tmp/cost.json | python {baseDir}/scripts/model_usage.py --input - --mode current

Output

Text (default) or JSON (--format json --pretty).
Values are cost-only per model; tokens are not split by model in CodexBar output.

References

Read references/codexbar-cli.md for CLI flags and cost JSON fields.

---name: model-usagedescription: Summarize CodexBar local cost logs by model for Codex or Claude, including current or full breakdowns.---# Model usage## OverviewGet per-model usage cost from CodexBar's local cost logs. Supports "current model" (most recent daily entry) or "all models" summaries for Codex or Claude.Live CodexBar CLI invocation is currently documented for macOS only. The bundled Python summarizer is portable: if you already have exported CodexBar JSON, `--input` mode works anywhere Python is available.## Quick start1. Fetch cost JSON via CodexBar CLI or pass a JSON file.2. Use the bundled script to summarize by model.```bashpython {baseDir}/scripts/model_usage.py --provider codex --mode currentpython {baseDir}/scripts/model_usage.py --provider codex --mode allpython {baseDir}/scripts/model_usage.py --provider claude --mode all --format json --pretty```## Current model logic- Uses the most recent daily row with `modelBreakdowns`.- Picks the model with the highest cost in that row.- Falls back to the last entry in `modelsUsed` when breakdowns are missing.- Override with `--model <name>` when you need a specific model.## Inputs- Default: runs `codexbar cost --format json --provider <codex|claude>`.- macOS: use the bundled CodexBar CLI install path above for live local usage reads.- Linux/other platforms: use `--input` with exported CodexBar JSON until this skill documents a supported local CodexBar install path for that platform.- File or stdin:```bashcodexbar cost --provider codex --format json > /tmp/cost.jsonpython {baseDir}/scripts/model_usage.py --input /tmp/cost.json --mode allcat /tmp/cost.json | python {baseDir}/scripts/model_usage.py --input - --mode current```## Output- Text (default) or JSON (`--format json --pretty`).- Values are cost-only per model; tokens are not split by model in CodexBar output.## References- Read `references/codexbar-cli.md` for CLI flags and cost JSON fields.

Frequently asked questions

Model Usage