diff --git a/redwood-treehouse-host/src/commonMain/kotlin/app/cash/redwood/treehouse/EventListener.kt b/redwood-treehouse-host/src/commonMain/kotlin/app/cash/redwood/treehouse/EventListener.kt
index 85da1c1e4b..9910a2aaa2 100644
--- a/redwood-treehouse-host/src/commonMain/kotlin/app/cash/redwood/treehouse/EventListener.kt
+++ b/redwood-treehouse-host/src/commonMain/kotlin/app/cash/redwood/treehouse/EventListener.kt
@@ -40,6 +40,15 @@ public open class EventListener {
    */
   public open fun codeLoadStart(): Any? = null
 
+  /**
+   * Invoked when a Zipline is created, after [codeLoadStart] and before any application code is
+   * loaded.
+   */
+  public open fun ziplineCreated(
+    zipline: Zipline,
+  ) {
+  }
+
   /**
    * Invoked when code is successfully downloaded and initialized.
    *
@@ -64,6 +73,17 @@ public open class EventListener {
   ) {
   }
 
+  /**
+   * Invoked when a code load is skipped because the cached code isn't up-to-date.
+   *
+   * @param startValue the value returned by [codeLoadStart] for the start of this call. This
+   *   is null unless [codeLoadStart] is overridden to return something else.
+   */
+  public open fun codeLoadSkippedNotFresh(
+    startValue: Any?,
+  ) {
+  }
+
   /**
    * Invoked when a code load fails.
    *
@@ -190,6 +210,15 @@ public open class EventListener {
   ) {
   }
 
+  /**
+   * Invoked when the loader has successfully fetched a manifest, verified it (if necessary), and
+   * will proceed to download and load each of its modules.
+   */
+  public open fun manifestReady(
+    manifest: ZiplineManifest,
+  ) {
+  }
+
   /**
    * Invoked when a module load starts. This is the process of loading code into QuickJS.
    *
diff --git a/redwood-treehouse-host/src/commonMain/kotlin/app/cash/redwood/treehouse/RealEventPublisher.kt b/redwood-treehouse-host/src/commonMain/kotlin/app/cash/redwood/treehouse/RealEventPublisher.kt
index 1d02138e6e..d8a3f15eca 100644
--- a/redwood-treehouse-host/src/commonMain/kotlin/app/cash/redwood/treehouse/RealEventPublisher.kt
+++ b/redwood-treehouse-host/src/commonMain/kotlin/app/cash/redwood/treehouse/RealEventPublisher.kt
@@ -43,6 +43,12 @@ internal class RealEventPublisher(
       return listener.codeLoadStart()
     }
 
+    override fun ziplineCreated(
+      zipline: Zipline,
+    ) {
+      listener.ziplineCreated(zipline)
+    }
+
     override fun applicationLoadSuccess(
       applicationName: String,
       manifestUrl: String?,
@@ -61,6 +67,14 @@ internal class RealEventPublisher(
       listener.codeLoadSkipped(startValue)
     }
 
+    override fun applicationLoadSkippedNotFresh(
+      applicationName: String,
+      manifestUrl: String?,
+      startValue: Any?,
+    ) {
+      listener.codeLoadSkippedNotFresh(startValue)
+    }
+
     override fun applicationLoadFailed(
       applicationName: String,
       manifestUrl: String?,
@@ -115,6 +129,14 @@ internal class RealEventPublisher(
       listener.manifestVerified(manifest, verifiedKey)
     }
 
+    override fun manifestReady(
+      applicationName: String,
+      manifestUrl: String?,
+      manifest: ZiplineManifest,
+    ) {
+      listener.manifestReady(manifest)
+    }
+
     override fun moduleLoadStart(zipline: Zipline, moduleId: String): Any? {
       return listener.moduleLoadStart(moduleId)
     }