Use when optimizing PHP application performance or configuring OPcache: sizing memory and cache limits, tuning revalidation strategy, enabling JIT compilation, setting up preloading, or diagnosing cache saturation and unexpected behavior in production.
Use when the user mentions Mago, asks to fix Mago errors, or when Mago diagnostic output (patterns like error[lint:...] or warning[analysis:...]) appears in conversation. Guides interpreting PHP linter and analyzer issues and fixing them by category priority.