Apply Phoenix LiveView Conventions

Use this skill when writing new LiveView modules or modifying existing LiveView code to ensure consistent, idiomatic Phoenix patterns.

Precondition: Invoke phoenix-liveview-essentials before this skill for the full callback lifecycle reference.

Quick Reference

Pattern	Convention
`@impl true`	Before every callback (mount, handle_event, handle_info, handle_params)
Assigns in mount	Static defaults in mount; URL-dependent in handle_params
Side effects	Guard with `if connected?(socket)` — only run when WebSocket connected
Return value	`{:noreply, socket}` from handle_event/handle_info
Error handling	Assign errors to socket with `put_flash`; never raise
Components	Use `def` (exported), not `defp`
Multi-step errors	Use `with` instead of nested case