astro

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Scope

Astro application engineering, written against Astro 7.3: project and route structure, the island model in both directions (client:* and server:defer), content collections and the content layer, output modes and adapters, astro:actions, middleware, sessions, astro:env, view transitions, integrations and Vite configuration, images and fonts, route caching, the build and CLI, and migration from Astro 4/5/6.

The dividing line for islands: this skill owns the boundary — which component becomes an island, which directive it gets, what crosses as props, what state can be shared, and what the framework renders on the server. It does not own what happens inside that component.

Not covered — do not answer from this skill: