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+<title>@EngineSystem — Ludic</title>
+<meta name="description" content="Register a package&#x27;s engine-owned system so the frame loop runs it each phase.">
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+<header class="nav"><div class="wrap nav-in"><a class="brand" href="index.html"><span class="logo">L</span> Ludic</a><button class="nav-toggle" aria-label="Toggle menu" aria-expanded="false">☰</button><nav class="nav-links"><a href="index.html">Home</a><a href="api.html">API Reference</a><a class="nav-cta" href="https://git.workshopsoft.io/workshopsoft/ludic">Source ↗</a></nav></div></header>
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+  <div class="crumbs"><a href="api.html">API Reference</a> <span>›</span> <a href="api.html#annotations">Annotations</a> <span>›</span> <span class="here">@EngineSystem</span></div>
+  <div class="item-head">
+    <span class="kind-badge kind-annotation">annotation</span>
+    <h1 id="top">@EngineSystem</h1>
+  </div>
+  <code class="sig">"@EngineSystem(Component, Phase) function esys_name() { … }"</code>
+  <div class="desc"><p><code>@EngineSystem(Component, Phase)</code> marks a function as an engine-owned system: the compiler adds it to the engine-system registry, and the frame loop calls it every <code>Phase</code> — after the game's own handlers — whenever the named <code>Component</code> is present in the program. It is the package-declarable form of the built-in engine systems (the ones that advance <code>SpriteAnim</code>/<code>Motion</code>/<code>Light2D</code>), so a third-party controller ships a system the same way the standard library does, with no compiler edit. The function reads and writes components by name through the reflection ABI, so it stays layout-independent and additive: a build that never declares the component compiles byte-for-byte the same. Phases are <code>Input</code>, <code>FixedUpdate</code>, <code>Update</code>, <code>LateUpdate</code> and <code>Render</code>.</p></div>
+  
+  <div class="examples"><h2>Example</h2><pre data-lang="ludic">program EngineSystemDemo {
+  property Score { value: int = 0 }
+  model Player { Score }
+
+  @EngineSystem(Score, Update) function esys_score() -&gt; void {   # runs every Update
+    let P = world_prop_id("Score")
+    let e = world_query_next(P, 0)
+    if e &gt;= 0 { world_set(e, P, 0, world_get(e, P, 0) + 1) }     # advance by name
+  }
+
+  @OnSpawn(Player) handler Init { }
+  handler Boot phase Start { let e = world_spawn(world_model_id("Player")) }
+  handler Run phase Update {
+    let P = world_prop_id("Score")
+    print(world_get(world_query_next(P, 0), P, 0))               # grows each frame
+    quit()
+  }
+}</pre></div>
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