ludic/docs/language/annotations/annot-reads.md
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docs(api): per-symbol pages, fuzzy search, deep token linking, hover cards
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Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-08-29 17:53:22 +03:00

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Markdown

---
id: annot-reads
name: @Reads
category: annotations
kind: annotation
tokens: @Reads
sig: @Reads(Property)
tip: Declare that a handler reads a property — an analysis and scheduling hint.
order: 50
---
<code>@Reads(Property)</code> declares that a handler reads the named property. It is an analysis hint: it documents a handler's data dependencies so tooling and scheduling can reason about which handlers touch which state — for example, to tell whether two handlers can run without conflict. It does not itself bind fields the way <code>@Queries</code> does, nor does it grant access; it annotates intent alongside the handler's actual query. Pair it with <code>@Writes</code> to spell out the full read/write footprint of a handler. Keep the named property real so the declared footprint matches what the body does.
```ludic
program ReadFootprint {
property Health { current: int = 100 }
property Score { total: int = 0 }
model Player { Health, Score }
@Reads(Health) # declares the read dependency
handler ReportLowHealth phase Update {
for (Health) in query [Health, {Player}] {
if Health.current < 25 { print(Health.current) }
}
}
handler SpawnPlayer phase Start {
spawn Player { Health { current: 20 }, Score { total: 0 } }
}
}
```