Also covers transition:persist for preserving component state across View Transitions, and prop serialization rules for data crossing the server/client boundary. Does not cover installing the underlying UI framework itself (astro-integrations) or Server Actions used inside islands (astro-actions) — those are separate skills.

Astro Islands Expert

Partial hydration architecture: zero JS by default, selective interactivity via directives.

Agent Workflow (MANDATORY)

Before ANY implementation, spawn 3 agents in parallel, one Agent call each with a name:

1. fuse-ai-pilot:explore-codebase - Analyze existing components and hydration patterns
2. fuse-ai-pilot:research-expert - Verify latest Islands docs via Context7/Exa
3. mcp__context7__query-docs - Get client directive and server:defer examples

After implementation, run fuse-ai-pilot:sniper for validation.