Stop "Fixing on Instinct"──Claude Code Gains build-eval / hillclimb to Automate Eval Creation and Self-Improvement
On September 28, Anthropic added build-eval and hillclimb to Claude Code's claude-api skill. They semi-automate eval creation and self-improvement, with built-in safeguards against overfitting, replacing "tuning by instinct" with tuning by the numbers.