Use when authoring or reviewing a PDK custom policy that inspects, gates, transforms, validates, routes, or optimizes MCP (Model Context Protocol) traffic on Flex Gateway — `initialize`, `tools/list`, `tools/call`, `resources/list`, `resources/read`, `resources/templates/list`, `prompts/list`, `prompts/get`, `completion/complete`, `logging/setLevel`, `ping`, and `notifications/*`.
