Beginning of a saveinspectionhandler.

src/main/java/cpw/mods/fml/common/Mod.java

@@ -103,9 +103,18 @@ public @interface Mod
      *
      * This is ignored if there is a {@link NetworkCheckHandler} annotation on a method in this class.
      *
-     * @return
+     * @return A version range as specified by the maven version range specification or the empty string
      */
     String acceptableRemoteVersions() default "";
+
+    /**
+     * A version range specifying compatible save version information. If your mod follows good version numbering
+     * practice <a href="http://semver.org/">Like this (http://semver.org/)</a> then this should be sufficient.
+     *
+     * Advanced users can specify a {@link SaveInspectionHandler} instead.
+     * @return A version range as specified by the maven version range specification or the empty string
+     */
+    String acceptableSaveVersions() default "";
     /**
      * An optional bukkit plugin that will be injected into the bukkit plugin framework if
      * this mod is loaded into the FML framework and the bukkit coremod is present.

src/main/java/cpw/mods/fml/common/SaveInspectionHandler.java

@@ -0,0 +1,20 @@
+package cpw.mods.fml.common;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * A method annotated with this on the {@link Mod} will be called whenever a local save is listed in
+ * the save games list.
+ *
+ * @author cpw
+ *
+ */
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.METHOD)
+public @interface SaveInspectionHandler
+{
+
+}

src/main/java/cpw/mods/fml/common/network/NetworkCheckHandler.java

@@ -4,7 +4,27 @@ import java.lang.annotation.ElementType;
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
+import cpw.mods.fml.relauncher.Side;
 
+/**
+ * A method annotated with this will be called when a remote network connection is offered.
+ * The method should have two parameters, of types {@link Map<String,String>} and {@link Side}. It should return a boolean
+ * true indicating that the remote party is acceptable, or false if not.
+ *
+ * <p>
+ * When the method is invoked, the map will contain String keys and values listing all mods and their versions present.
+ * The side represents the side of the remote party. So if you're on the server, it'll be CLIENT, and vice versa.
+ *
+ * <p>
+ * This method will be invoked both when querying the status of the remote server, and when connecting to the remote server.
+ *
+ * <p>
+ * <strong>NOTE: the server will not be setup at any point when this method is called. Do not try and interact with the server
+ * or the client in any way, except to accept or reject the list of mods.</strong>
+ *
+ * @author cpw
+ *
+ */
 @Retention(RetentionPolicy.RUNTIME)
 @Target(ElementType.METHOD)
 public @interface NetworkCheckHandler