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+<title>@On — Ludic</title>
+<meta name="description" content="Register a compile-time listener that runs whenever an event is emitted.">
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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">@On</span></div>
+  <div class="item-head">
+    <span class="kind-badge kind-annotation">annotation</span>
+    <h1 id="top">@On</h1>
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+  <code class="sig">@On(Event) handler Name { … }</code>
+  <div class="desc"><p><code>@On(Event)</code> turns a handler into a listener for a named <code>event</code>: whenever any code runs <code>emit Event(...)</code>, this handler's body runs with the event's fields bound by name. It is how systems talk to each other without referencing one another directly — the emitter never knows who is listening, so gameplay, UI and mods can all react to the same moment independently. Several handlers may listen to one event; they run in declaration order. On a <code>cancellable event</code>, a listener may <code>cancel</code> to veto it, and the emitter sees that outcome. Related lifecycle hooks such as <code>@OnSpawn</code>, <code>@OnEnable</code> and <code>@OnDespawn</code> are specialized event listeners the compiler wires up for you.</p></div>
+  
+  <div class="examples"><h2>Example</h2><pre data-lang="ludic">program Events {
+  property Health { current: int = 100, maximum: int = 100 }
+  model Player { Health }
+
+  event Damaged { amount: int = 0 }
+
+  handler SpawnPlayer phase Start {
+    spawn Player { Health { current: 100, maximum: 100 } }
+    emit Damaged(amount: 25)
+  }
+
+  @On(Damaged)
+  handler ReportDamage {
+    print(amount)
+  }
+}</pre></div>
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