Your customer's engineers have 60 agent skills installed, and leadership asks which to delete. How do you measure what each skill is worth?

Every installed skill costs context and competes for the agent's focus, but a three-task evaluation can't tell a useful skill from a useless one. How to run the paired with-and-without test, size it, and decide what to delete.

Updated Nov 2026 · Grounded in real Forward Deployed Engineer interview loops and written to a senior-engineer editorial bar.