Model usage
SkillAI & modelsmodel-usage is a skill that summarizes your per-model usage for Codex or Claude using the cost data CodexBar already tracks locally. Once added, your AI can tell you which models you used and what they cost, either for the most recent model or as a full breakdown across all of them.
Available today. Use it from your connected AI after setup.
No other account needed.
After adding the skill, ask your AI for model usage or costs from CodexBar, for example the latest model or a full per-model breakdown.
Then ask your AI: use the Model usage skill
What your AI can do with it
- Summarize usage and cost for each model
- Show usage for your most recent model
- Give a full breakdown across all models
- Read your local CodexBar cost data to build the summary
- Answer questions about model-level usage and costs
What this skill tells your AI
The instructions your AI receives, as published by craftos-dev/craftbot in skills/model-usage/SKILL.md and read by ahel’s review.
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.
TODO: add Linux CLI support guidance once CodexBar CLI install path is documented for Linux.
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
modelsUsedwhen breakdowns are missing. - Override with
--model <name>when you need a specific model.
Inputs
- Default: runs
codexbar cost --format json --provider <codex|claude>. - 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.mdfor CLI flags and cost JSON fields.
Signals
- GitHub stars
- 382
- Forks
- 45
- Last commit
- Sep 2026
ahel recommends instead
Advanced
- Catalog kind
- skill
- Gateway key
model-usage-craftos-dev- Source
- github.com/craftos-dev/craftbot