# Claude Code Adds claude plugin eval Command

The new command allows developers to generate test cases and benchmark output scores with and without their plugin enabled.

- Running claude plugin eval init prompts Claude to draft test cases, pilot the suite, and estimate total run token costs.
- Evaluation outputs include terminal score comparisons and an HTML report that can publish as a private artifact.
- Developers can update Claude Code to access the feature via claude update.

## Why it matters

Plugin authors can quantitatively test and measure the actual performance impact and token cost of their custom Claude Code skills.

## Sources

- [Anthropic: Claude Code Adds claude plugin eval Command](https://x.com/ClaudeDevs/status/2098500999656923145)

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Summarized by dstilled on 2026-09-11. https://dstilled.ai/story/afc39276-9d93-484b-a564-7b2473e45488