diff --git a/composeApp/src/commonMain/kotlin/com/nuvio/app/features/simkl/SimklSyncEngine.kt b/composeApp/src/commonMain/kotlin/com/nuvio/app/features/simkl/SimklSyncEngine.kt
index d7c846e66..b0dbceb90 100644
--- a/composeApp/src/commonMain/kotlin/com/nuvio/app/features/simkl/SimklSyncEngine.kt
+++ b/composeApp/src/commonMain/kotlin/com/nuvio/app/features/simkl/SimklSyncEngine.kt
@@ -16,18 +16,11 @@ internal class SimklSyncEngine(
         }
         if (current.watermark == null) return initialSync()
 
-        val delta = remote.fetchAllItems(
-            SimklAllItemsRequest(
-                dateFrom = current.watermark,
-                includeEpisodeDetails = true,
-            ),
-        )
+        val delta = remote.fetchAllItems(SimklAllItemsRequest.Changes(current.watermark))
         var entries = mergeDelta(current.entries, delta)
 
         if (hasRemovalActivityChanged(current.activities, activities)) {
-            val authoritativeIds = remote.fetchAllItems(
-                SimklAllItemsRequest(idsOnly = true),
-            )
+            val authoritativeIds = remote.fetchAllItems(SimklAllItemsRequest.CurrentIds)
             entries = reconcileRemovedEntries(entries, authoritativeIds)
         }
 
@@ -52,7 +45,7 @@ internal class SimklSyncEngine(
         val entries = buildList {
             SimklMediaType.entries.forEach { type ->
                 addAll(
-                    remote.fetchAllItems(SimklAllItemsRequest(type = type))
+                    remote.fetchAllItems(SimklAllItemsRequest.Bootstrap(type))
                         .entriesFor(type),
                 )
             }
diff --git a/composeApp/src/commonMain/kotlin/com/nuvio/app/features/simkl/SimklSyncRemote.kt b/composeApp/src/commonMain/kotlin/com/nuvio/app/features/simkl/SimklSyncRemote.kt
index 9279b0732..f1bad9ca1 100644
--- a/composeApp/src/commonMain/kotlin/com/nuvio/app/features/simkl/SimklSyncRemote.kt
+++ b/composeApp/src/commonMain/kotlin/com/nuvio/app/features/simkl/SimklSyncRemote.kt
@@ -6,12 +6,23 @@ import kotlinx.serialization.json.JsonArray
 import kotlinx.serialization.json.JsonNull
 import kotlinx.serialization.json.decodeFromJsonElement
 
-internal data class SimklAllItemsRequest(
-    val type: SimklMediaType? = null,
-    val dateFrom: String? = null,
-    val includeEpisodeDetails: Boolean = false,
-    val idsOnly: Boolean = false,
-)
+internal sealed interface SimklAllItemsRequest {
+    val type: SimklMediaType?
+
+    data class Bootstrap(
+        override val type: SimklMediaType,
+    ) : SimklAllItemsRequest
+
+    data class Changes(
+        val dateFrom: String,
+    ) : SimklAllItemsRequest {
+        override val type: SimklMediaType? = null
+    }
+
+    data object CurrentIds : SimklAllItemsRequest {
+        override val type: SimklMediaType? = null
+    }
+}
 
 internal interface SimklSyncRemote {
     suspend fun fetchActivities(): SimklActivities
@@ -38,17 +49,22 @@ internal class SimklApiSyncRemote(
     override suspend fun fetchAllItems(request: SimklAllItemsRequest): SimklAllItemsResponse {
         val path = request.type?.let { type -> "/sync/all-items/${type.apiValue}" }
             ?: "/sync/all-items"
-        val query = buildMap {
-            request.dateFrom?.let { value -> put("date_from", value) }
-            when {
-                request.idsOnly -> put("extended", "simkl_ids_only")
-                request.includeEpisodeDetails -> {
-                    put("extended", "full_anime_seasons")
-                    put("episode_watched_at", "yes")
-                    put("episode_tvdb_id", "yes")
-                    put("include_all_episodes", "original")
-                }
-            }
+        val query = when (request) {
+            is SimklAllItemsRequest.Bootstrap -> mapOf(
+                "extended" to "full",
+                "episode_watched_at" to "yes",
+                "include_all_episodes" to "yes",
+            )
+            is SimklAllItemsRequest.Changes -> mapOf(
+                "date_from" to request.dateFrom,
+                "extended" to "full_anime_seasons",
+                "episode_watched_at" to "yes",
+                "episode_tvdb_id" to "yes",
+                "include_all_episodes" to "yes",
+            )
+            SimklAllItemsRequest.CurrentIds -> mapOf(
+                "extended" to "simkl_ids_only",
+            )
         }
         return client.execute(
             SimklApiRequest(
diff --git a/composeApp/src/commonTest/kotlin/com/nuvio/app/features/simkl/SimklSyncEngineTest.kt b/composeApp/src/commonTest/kotlin/com/nuvio/app/features/simkl/SimklSyncEngineTest.kt
index 0a02dfb3c..f9e0d3ab9 100644
--- a/composeApp/src/commonTest/kotlin/com/nuvio/app/features/simkl/SimklSyncEngineTest.kt
+++ b/composeApp/src/commonTest/kotlin/com/nuvio/app/features/simkl/SimklSyncEngineTest.kt
@@ -50,9 +50,14 @@ class SimklSyncEngineTest {
         assertEquals(1, result.playback.size)
         assertEquals(500L, result.lastSyncedAtEpochMs)
         assertTrue(remote.isExhausted)
-        assertTrue(remote.allItemsRequests.all { request ->
-            request.dateFrom == null && !request.includeEpisodeDetails && !request.idsOnly
-        })
+        assertEquals(
+            listOf<SimklAllItemsRequest>(
+                SimklAllItemsRequest.Bootstrap(SimklMediaType.SHOWS),
+                SimklAllItemsRequest.Bootstrap(SimklMediaType.MOVIES),
+                SimklAllItemsRequest.Bootstrap(SimklMediaType.ANIME),
+            ),
+            remote.allItemsRequests,
+        )
     }
 
     @Test
@@ -112,9 +117,13 @@ class SimklSyncEngineTest {
         )
         assertEquals("3", result.playback.single().media?.ids?.idValue("simkl"))
         assertEquals("v2", result.watermark)
-        assertTrue(remote.allItemsRequests[0].includeEpisodeDetails)
-        assertEquals("v1", remote.allItemsRequests[0].dateFrom)
-        assertTrue(remote.allItemsRequests[1].idsOnly)
+        assertEquals(
+            listOf<SimklAllItemsRequest>(
+                SimklAllItemsRequest.Changes("v1"),
+                SimklAllItemsRequest.CurrentIds,
+            ),
+            remote.allItemsRequests,
+        )
         assertTrue(remote.isExhausted)
     }
 
@@ -139,7 +148,7 @@ class SimklSyncEngineTest {
     }
 
     @Test
-    fun `remote keeps initial pull minimal and adds rich flags only to dated delta`() = runBlocking {
+    fun `remote applies documented bootstrap delta and reconciliation parameters`() = runBlocking {
         var now = 0L
         val urls = mutableListOf<String>()
         val engine = SimklHttpEngine { _, url, _, _ ->
@@ -156,21 +165,20 @@ class SimklSyncEngineTest {
         )
         val remote = SimklApiSyncRemote(client)
 
-        remote.fetchAllItems(SimklAllItemsRequest(type = SimklMediaType.SHOWS))
-        remote.fetchAllItems(
-            SimklAllItemsRequest(
-                dateFrom = "2026-05-08T14:23:11Z",
-                includeEpisodeDetails = true,
-            ),
-        )
-        remote.fetchAllItems(SimklAllItemsRequest(idsOnly = true))
+        remote.fetchAllItems(SimklAllItemsRequest.Bootstrap(SimklMediaType.SHOWS))
+        remote.fetchAllItems(SimklAllItemsRequest.Changes("2026-05-08T14:23:11Z"))
+        remote.fetchAllItems(SimklAllItemsRequest.CurrentIds)
 
         assertFalse("date_from=" in urls[0])
-        assertFalse("extended=" in urls[0])
+        assertTrue("extended=full" in urls[0])
+        assertTrue("episode_watched_at=yes" in urls[0])
+        assertTrue("include_all_episodes=yes" in urls[0])
+        assertFalse("episode_tvdb_id=" in urls[0])
         assertTrue("date_from=2026-05-08T14%3A23%3A11Z" in urls[1])
         assertTrue("extended=full_anime_seasons" in urls[1])
         assertTrue("episode_watched_at=yes" in urls[1])
-        assertTrue("include_all_episodes=original" in urls[1])
+        assertTrue("episode_tvdb_id=yes" in urls[1])
+        assertTrue("include_all_episodes=yes" in urls[1])
         assertTrue("extended=simkl_ids_only" in urls[2])
     }
 
@@ -190,7 +198,7 @@ class SimklSyncEngineTest {
             )
 
             val response = SimklApiSyncRemote(client).fetchAllItems(
-                SimklAllItemsRequest(type = SimklMediaType.ANIME),
+                SimklAllItemsRequest.Bootstrap(SimklMediaType.ANIME),
             )
 
             assertTrue(response.entriesFor(SimklMediaType.ANIME).isEmpty())