AnthropicLaunchDevelopersSeptember 11, 2026

Anthropic adds plugin evals to Claude Code 2.1.269

The claude plugin eval command runs a plugin's eval suite against Claude Code, grades the output, then reruns each case without the plugin to show the difference, emitting scored JSON and HTML reports. MarkTechPost counts 6 grader types and a CI gate for skills; the release also adds /output-style and a Bash tool file-diff.

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Anthropic adds plugin evals to Claude Code 2.1.269