AnthropicLaunchDevelopersSeptember 30, 2026

Anthropic adds build-eval and hillclimb commands to Claude Code

Read original source →hamel.dev

The claude-api skill now ships /claude-api build-eval, which interviews the developer and builds an eval inside their codebase, and /claude-api hillclimb, which improves an app one change at a time against a held-out set to catch overfitting. Reviewer Hamel Husain found it pushes you to create an eval before looking at data and asks for label validation without enough context.

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