optimize

A performance pass on freshly written or modified hot-path code.

This skill never tells you how to run a profiling step twice. Every repeatable step is a script in scripts/perf/. The skill picks the script, runs it, reads the data, applies engine-specific fixes, and re-runs the same script to confirm the win. Engine knowledge that doesn't fit in a script lives in reference/ files this skill points at — instrumentation recipes, the curated bottleneck catalog, partner skills, big-win case studies.

If you find yourself writing prose instructions for the next agent on how to run profiling, stop — extract a script in scripts/perf/ and have the skill call it. See reference/script_first.md for the principle and where the boundary sits.

When to invoke