Biome Writer

spi/src/main/java/art/arcane/iris/spi/IrisPlatform.java

@@ -36,6 +36,8 @@ public interface IrisPlatform {
 
     PlatformStructureHooks structureHooks();
 
+    PlatformBiomeWriter biomeWriter();
+
     File dataFolder();
 
     void dispatchConsoleCommand(String command);

spi/src/main/java/art/arcane/iris/spi/PlatformBiomeWriter.java

@@ -0,0 +1,30 @@
+/*
+ * Iris is a World Generator for Minecraft Bukkit Servers
+ * Copyright (c) 2026 Arcane Arts (Volmit Software)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package art.arcane.iris.spi;
+
+import java.util.List;
+
+/**
+ * Resolves pack biome keys to platform biome ids for mantle injection and enumerates the platform's biome registry.
+ */
+public interface PlatformBiomeWriter {
+    int biomeIdFor(String key);
+
+    List<PlatformBiome> allBiomes();
+}