fix(base): support Purpur 26.3

BREAKING CHANGE: New release assets use purpur-base-<version>.jar. Runtime SpigotBase identity, data folders, permissions and persistent item keys remain unchanged. Replace the old JAR rather than loading both distributions.

.gitea/workflows/ci.yml

@@ -35,6 +35,6 @@ jobs:
       - name: Upload development artifact
         uses: actions/upload-artifact@v3
         with:
-          name: spigot-base-${{ github.sha }}
+          name: purpur-base-${{ github.sha }}
           path: build/libs/*.jar
           if-no-files-found: error

.gitea/workflows/release.yml

@@ -86,8 +86,8 @@ jobs:
         if: steps.release.outputs.created == 'true'
         uses: actions/upload-artifact@v3
         with:
-          name: spigot-base-${{ steps.release.outputs.version }}
-          path: build/libs/spigot-base-${{ steps.release.outputs.version }}.jar
+          name: purpur-base-${{ steps.release.outputs.version }}
+          path: build/libs/purpur-base-${{ steps.release.outputs.version }}.jar
           if-no-files-found: error
 
       - name: Create Gitea release and upload plugin
@@ -101,7 +101,7 @@ jobs:
           PREVIOUS_TAG: ${{ steps.previous_tag.outputs.value }}
         run: |
           api_url="${GITEA_SERVER_URL}/api/v1"
-          jar="build/libs/spigot-base-${VERSION}.jar"
+          jar="build/libs/purpur-base-${VERSION}.jar"
           export RELEASE_BODY
           if [ -n "$PREVIOUS_TAG" ]; then
             RELEASE_BODY=$(git log --pretty='format:- %s (%h)' "${PREVIOUS_TAG}..HEAD")
@@ -138,4 +138,4 @@ jobs:
             -H "Authorization: token ${GITEA_TOKEN}" \
             -H "Content-Type: application/octet-stream" \
             --data-binary "@${jar}" \
-            "${api_url}/repos/${REPOSITORY}/releases/${release_id}/assets?name=spigot-base-${VERSION}.jar"
+            "${api_url}/repos/${REPOSITORY}/releases/${release_id}/assets?name=purpur-base-${VERSION}.jar"

AGENTS.md

@@ -1,9 +1,9 @@
-# spigot-base agent entrypoint
+# purpur-base agent entrypoint
 
 The canonical stories, engineering guidance, and **all process documents** are in the private [SoMC OKF wiki](https://git.garvis.dev/dmg/somc-okf/src/branch/main/index.md).
 
-Before work, read the sibling `../somc-okf/index.md`, `../somc-okf/processes/index.md`, `../somc-okf/projects/spigot-base/index.md`, `engineering.md` in that project section, and relevant `../somc-okf/user-stories/spigot-base/` stories. Also follow the parent workspace `AGENTS.md` when present.
+Before work, read the sibling `../somc-okf/index.md`, `../somc-okf/processes/index.md`, `../somc-okf/projects/purpur-base/index.md`, `engineering.md` in that project section, and relevant `../somc-okf/user-stories/purpur-base/` stories. Also follow the parent workspace `AGENTS.md` when present.
 
-For standalone checkouts, start at the [project page](https://git.garvis.dev/dmg/somc-okf/src/branch/main/projects/spigot-base/index.md) and [shared process](https://git.garvis.dev/dmg/somc-okf/src/branch/main/processes/development.md). Obtain wiki access before feature work; do not recreate a local knowledge bundle. Source builds do not require private wiki access.
+For standalone checkouts, start at the [project page](https://git.garvis.dev/dmg/somc-okf/src/branch/main/projects/purpur-base/index.md) and [shared process](https://git.garvis.dev/dmg/somc-okf/src/branch/main/processes/development.md). Obtain wiki access before feature work; do not recreate a local knowledge bundle. Source builds do not require private wiki access.
 
 Development follows [Development cycle](https://git.garvis.dev/dmg/somc-okf/src/branch/main/runbooks/development-cycle.md): approved stories, failing tests, passing implementation, verification, then source/wiki commit and push. GitOps updates are committed locally **without pushing**; only [Do release](https://git.garvis.dev/dmg/somc-okf/src/branch/main/runbooks/do-release.md) authorizes a reviewed GitOps push.

README.md

@@ -1,14 +1,16 @@
-# Spigot Base
+# Purpur Base
 
-A Purpur 26.2 plugin providing progression-gated player bases and quality-of-life unlocks.
+A Purpur 26.3 plugin providing progression-gated player bases and quality-of-life unlocks.
 
 Players begin by breaking Survival-mode grass blocks or dirt. The progression paths provide a persistent base, navigation particles, expanding base bounds, controlled flight, personal teleportation, and visitor teleportation.
 
-The approved behavior is specified in the [SoMC OKF wiki](https://git.garvis.dev/dmg/somc-okf/src/branch/main/projects/spigot-base/index.md).
+The approved behavior is specified in the [SoMC OKF wiki](https://git.garvis.dev/dmg/somc-okf/src/branch/main/projects/purpur-base/index.md).
+
+The repository and new artifacts are named `purpur-base`. Runtime identity remains `SpigotBase`: existing `plugins/SpigotBase/` data, commands, `spigotbase.*` permissions, item keys and Java entrypoints remain compatible. Replace the old JAR when installing a new release; never load both distributions together. Historical `spigot-base-*` release assets are retained.
 
 ## Requirements
 
-- Purpur 26.2 build 2618
+- Purpur 26.3 build 2651
 - Java 25 or newer
 
 ## Build
@@ -17,7 +19,7 @@ The approved behavior is specified in the [SoMC OKF wiki](https://git.garvis.dev
 ./gradlew clean check jar
 ```
 
-The plugin JAR is written to `build/libs/`. `check` includes native label packet tests against the SHA-256-verified Purpur 2618 runtime. The build downloads/patches that runtime under `build/label-runtime/`, loads its registries, and exercises codecs without starting a listening Minecraft server.
+The plugin JAR is written to `build/libs/`. `check` includes native label packet tests against the SHA-256-verified Purpur 2651 runtime. The build downloads/patches that runtime under `build/label-runtime/`, loads its registries, and exercises codecs without starting a listening Minecraft server.
 
 ## Player commands
 

build.gradle.kts

@@ -26,9 +26,9 @@ tasks.withType<JavaCompile>().configureEach {
 }
 
 dependencies {
-    compileOnly("org.purpurmc.purpur:purpur-api:26.2.build.2618-stable")
+    compileOnly("org.purpurmc.purpur:purpur-api:26.3.build.2651-stable")
 
-    testImplementation("org.purpurmc.purpur:purpur-api:26.2.build.2618-stable")
+    testImplementation("org.purpurmc.purpur:purpur-api:26.3.build.2651-stable")
     testImplementation(platform("org.junit:junit-bom:5.13.4"))
     testImplementation("org.junit.jupiter:junit-jupiter")
     testImplementation("org.mockito:mockito-core:5.18.0")
@@ -38,23 +38,26 @@ dependencies {
 
 tasks.test {
     useJUnitPlatform()
+    dependsOn(tasks.jar)
+    systemProperty("distribution.jar", tasks.jar.get().archiveFile.get().asFile.absolutePath)
+    systemProperty("distribution.version", project.version.toString())
 }
 
 // Verify client-only label packets against the declared runtime, without starting a server.
 val labelRuntime = layout.buildDirectory.dir("label-runtime")
 val downloadLabelRuntime = tasks.register("downloadLabelRuntime") {
-    val launcher = labelRuntime.map { it.file("purpur-26.2-2618.jar") }
+    val launcher = labelRuntime.map { it.file("purpur-26.3-2651.jar") }
     outputs.file(launcher)
     doLast {
         val file = launcher.get().asFile
         file.parentFile.mkdirs()
-        val connection = URI("https://api.purpurmc.org/v2/purpur/26.2/2618/download").toURL().openConnection()
+        val connection = URI("https://api.purpurmc.org/v2/purpur/26.3/2651/download").toURL().openConnection()
         connection.connectTimeout = 30_000
         connection.readTimeout = 120_000
         val bytes = connection.getInputStream().use { it.readBytes() }
         val digest = MessageDigest.getInstance("SHA-256").digest(bytes).joinToString("") { "%02x".format(it) }
-        check(digest == "4a32d046a118804d89ca74ba89b798c98f6d8d1f310c18077ac573597049de31") {
-            "Purpur 2618 checksum mismatch"
+        check(digest == "0677c1febecfbc2e5b0a7f76abd647b70a1f38d3cbdf3dd6a82e401b4262a598") {
+            "Purpur 2651 checksum mismatch"
         }
         file.writeBytes(bytes)
     }
@@ -62,7 +65,7 @@ val downloadLabelRuntime = tasks.register("downloadLabelRuntime") {
 val prepareLabelRuntime = tasks.register<JavaExec>("prepareLabelRuntime") {
     dependsOn(downloadLabelRuntime)
     javaLauncher = javaToolchains.launcherFor { languageVersion = JavaLanguageVersion.of(25) }
-    classpath = files(labelRuntime.map { it.file("purpur-26.2-2618.jar") })
+    classpath = files(labelRuntime.map { it.file("purpur-26.3-2651.jar") })
     mainClass = "io.papermc.paperclip.Main"
     jvmArgs("-Dpaperclip.patchonly=true")
     workingDir(labelRuntime)

settings.gradle.kts

@@ -2,4 +2,4 @@ plugins {
     id("org.gradle.toolchains.foojay-resolver-convention") version "1.0.0"
 }
 
-rootProject.name = "spigot-base"
+rootProject.name = "purpur-base"

src/main/java/games/dmg/spigotbase/BaseSettingsCommand.java

@@ -29,6 +29,7 @@ final class BaseSettingsCommand implements CommandExecutor, TabCompleter {
     private final TeleportPolicy teleportPolicy;
     private final BaseFlightController flightController;
     private final PocketBaseManager pocketBases;
+    private final PocketBaseRecipeDiscovery recipeDiscovery;
     private final DialogProvider dialogProvider;
 
     BaseSettingsCommand(
@@ -44,12 +45,26 @@ final class BaseSettingsCommand implements CommandExecutor, TabCompleter {
         PluginSettingsProvider settings,
         BaseFlightController flightController,
         PocketBaseManager pocketBases
+    ) {
+        this(
+            stateManager, settings, flightController, pocketBases,
+            (PocketBaseRecipeDiscovery) null
+        );
+    }
+
+    BaseSettingsCommand(
+        BaseStateManager stateManager,
+        PluginSettingsProvider settings,
+        BaseFlightController flightController,
+        PocketBaseManager pocketBases,
+        PocketBaseRecipeDiscovery recipeDiscovery
     ) {
         this(
             stateManager,
             settings,
             flightController,
             pocketBases,
+            recipeDiscovery,
             (owner, pocket) -> new BaseSettingsDialogFactory(settings.current())
                 .create(owner, pocket)
         );
@@ -61,12 +76,24 @@ final class BaseSettingsCommand implements CommandExecutor, TabCompleter {
         BaseFlightController flightController,
         PocketBaseManager pocketBases,
         DialogProvider dialogProvider
+    ) {
+        this(stateManager, settings, flightController, pocketBases, null, dialogProvider);
+    }
+
+    BaseSettingsCommand(
+        BaseStateManager stateManager,
+        PluginSettingsProvider settings,
+        BaseFlightController flightController,
+        PocketBaseManager pocketBases,
+        PocketBaseRecipeDiscovery recipeDiscovery,
+        DialogProvider dialogProvider
     ) {
         this.stateManager = stateManager;
         this.settings = settings;
         this.teleportPolicy = new TeleportPolicy(settings);
         this.flightController = flightController;
         this.pocketBases = pocketBases;
+        this.recipeDiscovery = recipeDiscovery;
         this.dialogProvider = dialogProvider;
     }
 
@@ -202,6 +229,9 @@ final class BaseSettingsCommand implements CommandExecutor, TabCompleter {
                 + "The Pocket Base upgrade failed; your payment was restored.");
             return true;
         }
+        if (recipeDiscovery != null) {
+            recipeDiscovery.discoverCreation(player);
+        }
         player.sendTitle(
             ChatColor.GOLD + "Pocket Base " + upgraded.level() + " Unlocked",
             ChatColor.YELLOW + "Build a portal inside your base",

src/main/java/games/dmg/spigotbase/PocketBaseKeystoneService.java

@@ -5,6 +5,8 @@ import java.util.List;
 import java.util.Optional;
 import java.util.Set;
 import java.util.UUID;
+import java.util.function.BooleanSupplier;
+import java.util.function.Predicate;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 import net.kyori.adventure.text.Component;
@@ -26,8 +28,10 @@ import org.bukkit.event.inventory.PrepareItemCraftEvent;
 import org.bukkit.event.player.PlayerInteractEvent;
 import org.bukkit.event.player.PlayerTeleportEvent;
 import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.Recipe;
 import org.bukkit.inventory.ShapedRecipe;
 import org.bukkit.inventory.meta.ItemMeta;
+import org.bukkit.inventory.recipe.CraftingBookCategory;
 import org.bukkit.persistence.PersistentDataType;
 
 final class PocketBaseKeystoneService implements Listener {
@@ -46,6 +50,8 @@ final class PocketBaseKeystoneService implements Listener {
     private final KeystoneReturnStore returns;
     private final NamespacedKey markerKey;
     private final Logger logger;
+    private BooleanSupplier recipesAvailable = () -> true;
+    private Predicate<Recipe> recipeControlled = this::ourRecipe;
 
     PocketBaseKeystoneService(
         Server server,
@@ -61,18 +67,30 @@ final class PocketBaseKeystoneService implements Listener {
         this.logger = logger;
     }
 
+    void setRecipesAvailable(BooleanSupplier available) {
+        this.recipesAvailable = available;
+    }
+
+    void setRecipeControl(Predicate<Recipe> controlled) {
+        this.recipeControlled = controlled;
+    }
+
     @EventHandler(priority = EventPriority.HIGH)
     public void onPrepareCraft(PrepareItemCraftEvent event) {
-        if (!(event.getRecipe() instanceof ShapedRecipe shaped)
-                || !shaped.getKey().equals(markerKey)
-                || !(event.getView().getPlayer() instanceof Player player)) {
+        if (!(event.getView().getPlayer() instanceof Player player)
+                || !recipeControlled.test(event.getRecipe())) {
             return;
         }
-        if (pocketBases.state(player.getUniqueId()).level() < 1) {
+        if (!recipesAvailable.getAsBoolean()
+                || pocketBases.state(player.getUniqueId()).level() < 1) {
             event.getInventory().setResult(null);
         }
     }
 
+    private boolean ourRecipe(Recipe recipe) {
+        return recipe instanceof ShapedRecipe shaped && shaped.getKey().equals(markerKey);
+    }
+
     @EventHandler(priority = EventPriority.HIGH)
     public void onUse(PlayerInteractEvent event) {
         Action action = event.getAction();
@@ -200,8 +218,12 @@ final class PocketBaseKeystoneService implements Listener {
         return marker != null && marker == (byte) 1;
     }
 
+    ShapedRecipe recipe() {
+        return recipe(markerKey, createKeystone(markerKey));
+    }
+
     void registerRecipe() {
-        server.addRecipe(recipe(markerKey, createKeystone(markerKey)));
+        server.addRecipe(recipe());
     }
 
     static ItemStack createKeystone(NamespacedKey markerKey) {
@@ -244,6 +266,7 @@ final class PocketBaseKeystoneService implements Listener {
         recipe.setIngredient('O', specification.obsidian());
         recipe.setIngredient('N', specification.netherite());
         recipe.setIngredient('E', specification.enderPearl());
+        recipe.setCategory(CraftingBookCategory.EQUIPMENT);
         return recipe;
     }
 

src/main/java/games/dmg/spigotbase/PocketBaseManager.java

@@ -187,6 +187,10 @@ final class PocketBaseManager {
         return worlds.ownerForWorld(worldId);
     }
 
+    Optional<Location> availablePocketArrival(UUID ownerId) {
+        return state(ownerId).level() > 0 ? worlds.availableArrival(ownerId) : Optional.empty();
+    }
+
     Location pocketArrival(UUID ownerId) {
         return worlds.arrival(ownerId);
     }

src/main/java/games/dmg/spigotbase/PocketBaseRecipeDiscovery.java

@@ -0,0 +1,117 @@
+package games.dmg.spigotbase;
+
+import java.util.List;
+import java.util.Objects;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+import org.bukkit.NamespacedKey;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.Listener;
+import org.bukkit.event.player.PlayerJoinEvent;
+import org.bukkit.inventory.ItemStack;
+
+/** Awards recipe-book knowledge; crafting handlers remain the authority. */
+final class PocketBaseRecipeDiscovery implements Listener {
+    private final PocketBaseRecipeRegistry registry;
+    private final PocketBaseManager pockets;
+    private final PocketBaseSharingCompass sharing;
+    private final List<NamespacedKey> creationKeys;
+    private final NamespacedKey rechargeKey;
+    private final Logger logger;
+
+    PocketBaseRecipeDiscovery(
+        PocketBaseRecipeRegistry registry,
+        PocketBaseManager pockets,
+        PocketBaseSharingCompass sharing,
+        NamespacedKey keystoneKey,
+        NamespacedKey sharingCreationKey,
+        NamespacedKey rechargeKey,
+        Logger logger
+    ) {
+        this.registry = Objects.requireNonNull(registry, "registry");
+        this.pockets = Objects.requireNonNull(pockets, "pockets");
+        this.sharing = Objects.requireNonNull(sharing, "sharing");
+        this.creationKeys = List.of(keystoneKey, sharingCreationKey);
+        this.rechargeKey = Objects.requireNonNull(rechargeKey, "recharge key");
+        this.logger = Objects.requireNonNull(logger, "logger");
+    }
+
+    void reconcileOnline(Iterable<? extends Player> players) {
+        for (Player player : players) {
+            reconcile(player);
+        }
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR)
+    public void onJoin(PlayerJoinEvent event) {
+        reconcile(event.getPlayer());
+    }
+
+    void reconcile(Player player) {
+        try {
+            sharing.normalizeCarried(player);
+            if (!registry.isAvailable()) {
+                return;
+            }
+            if (pockets.state(player.getUniqueId()).level() > 0) {
+                for (NamespacedKey key : creationKeys) {
+                    awardSafely(player, key);
+                }
+            }
+            if (carriesAuthenticCompass(player)) {
+                awardSafely(player, rechargeKey);
+            }
+        } catch (RuntimeException exception) {
+            logger.log(Level.WARNING,
+                "Could not reconcile Pocket Base recipe discovery for " + player.getUniqueId(),
+                exception);
+        }
+    }
+
+    void discoverCreation(Player player) {
+        if (!registry.isAvailable()) {
+            return;
+        }
+        for (NamespacedKey key : creationKeys) {
+            awardSafely(player, key);
+        }
+    }
+
+    void discoverRecharge(Player player) {
+        if (registry.isAvailable()) {
+            awardSafely(player, rechargeKey);
+        }
+    }
+
+    private boolean carriesAuthenticCompass(Player player) {
+        for (ItemStack item : player.getInventory().getStorageContents()) {
+            if (sharing.isAuthentic(item)) {
+                return true;
+            }
+        }
+        return sharing.isAuthentic(player.getInventory().getItemInOffHand());
+    }
+
+    private void awardSafely(Player player, NamespacedKey key) {
+        try {
+            award(player, key);
+        } catch (RuntimeException exception) {
+            logger.log(Level.WARNING,
+                "Could not discover Pocket Base recipe " + key + " for "
+                    + player.getUniqueId(), exception);
+        }
+    }
+
+    private void award(Player player, NamespacedKey key) {
+        if (player.hasDiscoveredRecipe(key)) {
+            return;
+        }
+        player.discoverRecipe(key);
+        if (!player.hasDiscoveredRecipe(key)) {
+            logger.warning("Pocket Base recipe discovery postcondition was not met for "
+                + player.getUniqueId() + " and " + key + "; a later reconciliation will retry");
+        }
+    }
+}

src/main/java/games/dmg/spigotbase/PocketBaseRecipeRegistry.java

@@ -0,0 +1,240 @@
+package games.dmg.spigotbase;
+
+import java.util.HashSet;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+import java.util.UUID;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+import org.bukkit.Keyed;
+import org.bukkit.NamespacedKey;
+import org.bukkit.Server;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.Recipe;
+import org.bukkit.inventory.RecipeChoice;
+import org.bukkit.inventory.ShapedRecipe;
+
+/** Owns only recipes successfully added during this plugin lifecycle. */
+final class PocketBaseRecipeRegistry implements AutoCloseable {
+    private static final int REQUIRED_RECIPE_COUNT = 3;
+    private final Server server;
+    private final List<Recipe> recipes;
+    private final Logger logger;
+    private final Map<NamespacedKey, Recipe> owned = new LinkedHashMap<>();
+    private boolean attempted;
+    private boolean available;
+
+    PocketBaseRecipeRegistry(Server server, List<? extends Recipe> recipes, Logger logger) {
+        this.server = Objects.requireNonNull(server, "server");
+        this.recipes = List.copyOf(recipes);
+        this.logger = Objects.requireNonNull(logger, "logger");
+        if (this.recipes.size() != REQUIRED_RECIPE_COUNT) {
+            throw new IllegalArgumentException("Pocket Base travel requires exactly three recipes");
+        }
+        Set<NamespacedKey> keys = new HashSet<>();
+        String lifecycle = UUID.randomUUID().toString();
+        for (Recipe recipe : this.recipes) {
+            if (!(recipe instanceof Keyed keyed) || !keys.add(keyed.getKey())) {
+                throw new IllegalArgumentException("Pocket Base travel recipes require three unique keys");
+            }
+            if (recipe instanceof ShapedRecipe shaped) {
+                shaped.setGroup("spigotbase-owned-" + lifecycle + "-" + keyed.getKey());
+            }
+        }
+    }
+
+    boolean register() {
+        if (attempted) {
+            return available;
+        }
+        attempted = true;
+        try {
+            for (Recipe recipe : recipes) {
+                NamespacedKey key = ((Keyed) recipe).getKey();
+                boolean added;
+                try {
+                    added = server.addRecipe(recipe);
+                } catch (RuntimeException exception) {
+                    try {
+                        if (sameDefinition(recipe, server.getRecipe(key))) {
+                            owned.put(key, recipe);
+                        }
+                    } catch (RuntimeException inspectionFailure) {
+                        exception.addSuppressed(inspectionFailure);
+                    }
+                    throw exception;
+                }
+                if (!added) {
+                    logger.warning("Pocket Base travel recipe registration is incomplete at "
+                        + key + "; recipe discovery is disabled for this lifecycle");
+                    rollback();
+                    return false;
+                }
+                owned.put(key, recipe);
+            }
+            available = true;
+            return true;
+        } catch (RuntimeException exception) {
+            logger.log(Level.SEVERE,
+                "Pocket Base travel recipe registration failed; recipe discovery is disabled for this lifecycle",
+                exception);
+            rollback();
+            return false;
+        }
+    }
+
+    boolean isAvailable() {
+        if (!available) {
+            return false;
+        }
+        for (var entry : owned.entrySet()) {
+            try {
+                if (!sameDefinition(entry.getValue(), server.getRecipe(entry.getKey()))) {
+                    available = false;
+                    return false;
+                }
+            } catch (RuntimeException exception) {
+                logger.log(Level.WARNING,
+                    "Could not verify active Pocket Base travel recipe " + entry.getKey(),
+                    exception);
+                return false;
+            }
+        }
+        return owned.size() == REQUIRED_RECIPE_COUNT;
+    }
+
+    boolean controls(Recipe candidate) {
+        if (!(candidate instanceof Keyed keyed)) {
+            return false;
+        }
+        Recipe definition = owned.get(keyed.getKey());
+        if (!sameDefinition(definition, candidate)) {
+            return false;
+        }
+        try {
+            boolean controls = sameDefinition(definition, server.getRecipe(keyed.getKey()));
+            if (!controls) {
+                available = false;
+            }
+            return controls;
+        } catch (RuntimeException exception) {
+            available = false;
+            logger.log(Level.WARNING,
+                "Could not verify active Pocket Base travel recipe " + keyed.getKey()
+                    + "; keeping its handler fail-closed",
+                exception);
+            return true;
+        }
+    }
+
+    private void rollback() {
+        available = false;
+        for (var entry : Map.copyOf(owned).entrySet()) {
+            NamespacedKey key = entry.getKey();
+            Recipe active;
+            try {
+                active = server.getRecipe(key);
+            } catch (RuntimeException exception) {
+                logger.log(Level.SEVERE,
+                    "Could not verify owned Pocket Base travel recipe " + key, exception);
+                continue;
+            }
+            if (!sameDefinition(entry.getValue(), active)) {
+                owned.remove(key);
+                continue;
+            }
+            try {
+                if (server.removeRecipe(key)) {
+                    owned.remove(key);
+                }
+            } catch (RuntimeException exception) {
+                logger.log(Level.SEVERE, "Could not remove owned Pocket Base travel recipe " + key,
+                    exception);
+            }
+        }
+    }
+
+    private static boolean sameDefinition(Recipe expected, Recipe actual) {
+        if (expected == actual) {
+            return true;
+        }
+        if (!(expected instanceof ShapedRecipe expectedShaped)
+                || !(actual instanceof ShapedRecipe actualShaped)) {
+            return false;
+        }
+        if (!expectedShaped.getKey().equals(actualShaped.getKey())
+                || !expectedShaped.getResult().equals(actualShaped.getResult())
+                || !sameIngredientGrid(expectedShaped, actualShaped)
+                || !expectedShaped.getGroup().equals(actualShaped.getGroup())
+                || expectedShaped.getCategory() != actualShaped.getCategory()) {
+            return false;
+        }
+        return true;
+    }
+
+    private static boolean sameIngredientGrid(
+            ShapedRecipe expected, ShapedRecipe actual) {
+        String[] expectedShape = expected.getShape();
+        String[] actualShape = actual.getShape();
+        if (expectedShape.length != actualShape.length) {
+            return false;
+        }
+        Map<Character, RecipeChoice> expectedChoices = expected.getChoiceMap();
+        Map<Character, RecipeChoice> actualChoices = actual.getChoiceMap();
+        for (int row = 0; row < expectedShape.length; row++) {
+            if (expectedShape[row].length() != actualShape[row].length()) {
+                return false;
+            }
+            for (int column = 0; column < expectedShape[row].length(); column++) {
+                RecipeChoice expectedChoice = expectedChoices.get(
+                    expectedShape[row].charAt(column));
+                RecipeChoice actualChoice = actualChoices.get(
+                    actualShape[row].charAt(column));
+                if (!sameChoice(expectedChoice, actualChoice)) {
+                    return false;
+                }
+            }
+        }
+        return true;
+    }
+
+    private static boolean sameChoice(RecipeChoice expected, RecipeChoice actual) {
+        Set<String> expectedMaterials = materialKeys(expected);
+        Set<String> actualMaterials = materialKeys(actual);
+        if (expectedMaterials != null || actualMaterials != null) {
+            return Objects.equals(expectedMaterials, actualMaterials);
+        }
+        if (expected instanceof RecipeChoice.ExactChoice expectedItems
+                && actual instanceof RecipeChoice.ExactChoice actualItems) {
+            List<ItemStack> expectedChoices = expectedItems.getChoices();
+            List<ItemStack> actualChoices = actualItems.getChoices();
+            return expectedChoices.equals(actualChoices);
+        }
+        return Objects.equals(expected, actual);
+    }
+
+    private static Set<String> materialKeys(RecipeChoice choice) {
+        Set<String> keys = new HashSet<>();
+        if (choice instanceof RecipeChoice.MaterialChoice materials) {
+            for (var material : materials.getChoices()) {
+                keys.add(material.getKey().asString());
+            }
+            return Set.copyOf(keys);
+        }
+        if (choice instanceof RecipeChoice.ItemTypeChoice itemTypes) {
+            for (var itemType : itemTypes.itemTypes().values()) {
+                keys.add(itemType.key().asString());
+            }
+            return Set.copyOf(keys);
+        }
+        return null;
+    }
+
+    @Override
+    public void close() {
+        rollback();
+    }
+}

src/main/java/games/dmg/spigotbase/PocketBaseSharingCompass.java

@@ -0,0 +1,411 @@
+package games.dmg.spigotbase;
+
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+import java.util.UUID;
+import java.util.function.BooleanSupplier;
+import java.util.function.IntSupplier;
+import java.util.function.Predicate;
+import net.kyori.adventure.text.Component;
+import org.bukkit.Keyed;
+import org.bukkit.Location;
+import org.bukkit.Material;
+import org.bukkit.NamespacedKey;
+import org.bukkit.Server;
+import org.bukkit.entity.Player;
+import org.bukkit.event.Event;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.Listener;
+import org.bukkit.event.block.Action;
+import org.bukkit.event.entity.PlayerDeathEvent;
+import org.bukkit.event.inventory.ClickType;
+import org.bukkit.event.inventory.CraftItemEvent;
+import org.bukkit.event.inventory.InventoryType;
+import org.bukkit.event.inventory.PrepareItemCraftEvent;
+import org.bukkit.event.player.PlayerInteractEvent;
+import org.bukkit.event.player.PlayerRecipeBookClickEvent;
+import org.bukkit.event.player.PlayerTeleportEvent;
+import org.bukkit.inventory.EquipmentSlot;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.Recipe;
+import org.bukkit.inventory.RecipeChoice;
+import org.bukkit.inventory.ShapedRecipe;
+import org.bukkit.inventory.recipe.CraftingBookCategory;
+import org.bukkit.persistence.PersistentDataType;
+
+/** Destination-bound guest access, separate from holder-bound Keystones. */
+final class PocketBaseSharingCompass implements Listener {
+    private final Server server;
+    private final PocketBaseManager pockets;
+    private final NamespacedKey key;
+    private final NamespacedKey rechargeKey;
+    private final NamespacedKey ownerKey;
+    private final NamespacedKey chargesKey;
+    private final NamespacedKey identityKey;
+    private final NamespacedKey ownerNameKey;
+    private final IntSupplier roll;
+    private final Set<UUID> travelling = new HashSet<>();
+    private PocketBaseRecipeDiscovery recipeDiscovery;
+    private BooleanSupplier recipesAvailable = () -> true;
+    private Predicate<Recipe> recipeControlled = this::ourRecipe;
+
+    PocketBaseSharingCompass(Server server, PocketBaseManager pockets, NamespacedKey key, IntSupplier roll) {
+        this.server = server;
+        this.pockets = pockets;
+        this.key = key;
+        this.rechargeKey = new NamespacedKey(key.getNamespace(), key.getKey() + "_recharge");
+        this.ownerKey = new NamespacedKey(key.getNamespace(), key.getKey() + "_owner");
+        this.chargesKey = new NamespacedKey(key.getNamespace(), key.getKey() + "_charges");
+        this.identityKey = new NamespacedKey(key.getNamespace(), key.getKey() + "_id");
+        this.ownerNameKey = new NamespacedKey(key.getNamespace(), key.getKey() + "_owner_name");
+        this.roll = roll;
+    }
+
+    void setRecipeDiscovery(PocketBaseRecipeDiscovery discovery) {
+        this.recipeDiscovery = discovery;
+    }
+
+    void setRecipesAvailable(BooleanSupplier available) {
+        this.recipesAvailable = available;
+    }
+
+    void setRecipeControl(Predicate<Recipe> controlled) {
+        this.recipeControlled = controlled;
+    }
+
+    List<ShapedRecipe> recipes() {
+        var creation = new ShapedRecipe(key, representative("Creation"));
+        creation.shape("DED", "ECE", "DED");
+        creation.setIngredient('D', Material.DIAMOND_BLOCK);
+        creation.setIngredient('E', Material.ECHO_SHARD);
+        creation.setIngredient('C', Material.END_CRYSTAL);
+        creation.setCategory(CraftingBookCategory.EQUIPMENT);
+        var recharge = new ShapedRecipe(rechargeKey, representative("Recharge"));
+        recharge.shape("PPP", "PCP", "PPP");
+        recharge.setIngredient('P', Material.ENDER_PEARL);
+        recharge.setIngredient('C', new RecipeChoice.MaterialChoice(Material.COMPASS));
+        recharge.setCategory(CraftingBookCategory.EQUIPMENT);
+        return List.of(creation, recharge);
+    }
+
+    void registerRecipes() {
+        recipes().forEach(server::addRecipe);
+    }
+
+    private static ItemStack representative(String purpose) {
+        ItemStack item = new ItemStack(Material.COMPASS);
+        var meta = item.getItemMeta();
+        meta.displayName(Component.text(
+            "Pocket Base Sharing Compass — " + purpose + " Representative"));
+        meta.lore(List.of(
+            Component.text("Non-authoritative recipe-book display only."),
+            Component.text("Only an authenticated bound Sharing Compass is usable.")
+        ));
+        item.setItemMeta(meta);
+        return item;
+    }
+
+    @EventHandler(priority = EventPriority.LOWEST)
+    public void onRecipeBookClick(PlayerRecipeBookClickEvent event) {
+        if (event.getOriginalRecipe() instanceof Keyed keyed
+                && rechargeKey.equals(keyed.getKey())
+                && recipeControlled.test(event.getOriginalRecipe())) {
+            normalizeStorage(event.getPlayer());
+        }
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST)
+    public void onPrepare(PrepareItemCraftEvent event) {
+        if (!(event.getView().getPlayer() instanceof Player player)
+                || !recipeControlled.test(event.getRecipe())
+                || empty(event.getInventory().getResult())) return;
+        // Only definitions still owned by this lifecycle are intercepted.
+        if (!recipesAvailable.getAsBoolean()) {
+            event.getInventory().setResult(null);
+            return;
+        }
+        // Only our candidate matrices/results are replaced; unrelated recipes remain untouched.
+        ItemStack[] matrix = event.getInventory().getMatrix();
+        if (rechargeCandidate(matrix)) {
+            event.getInventory().setResult(rechargeAllowed(matrix, player, event.getInventory().getLocation())
+                ? withCharges(matrix[4], state(matrix[4]).charges() + 8) : null);
+            return;
+        }
+        if (matrix.length != 9 || !material(matrix[4], Material.END_CRYSTAL)) return;
+        event.getInventory().setResult(creationMatrix(matrix) && pockets.state(player.getUniqueId()).level() > 0
+            ? create(player.getUniqueId(), player.getName()) : null);
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
+    public void onCraft(CraftItemEvent event) {
+        if (!recipeControlled.test(event.getRecipe())) return;
+        event.setCancelled(true);
+        if (!recipesAvailable.getAsBoolean()) {
+            event.getInventory().setResult(null);
+            return;
+        }
+        ItemStack[] matrix = event.getInventory().getMatrix();
+        boolean creation = creationMatrix(matrix);
+        boolean recharge = rechargeCandidate(matrix);
+        if (!creation && !recharge) {
+            event.getInventory().setResult(null);
+            return;
+        }
+        if (empty(event.getInventory().getResult()) || !(event.getWhoClicked() instanceof Player player)
+                || event.getRawSlot() != 0 || event.getView().getType() != InventoryType.WORKBENCH) return;
+        if (creation ? pockets.state(player.getUniqueId()).level() < 1
+                : !rechargeAllowed(matrix, player, event.getInventory().getLocation())) return;
+        boolean shift = event.isShiftClick();
+        if (event.getClick() != ClickType.LEFT && event.getClick() != ClickType.RIGHT
+                && event.getClick() != ClickType.SHIFT_LEFT && event.getClick() != ClickType.SHIFT_RIGHT) return;
+        int slot = shift ? player.getInventory().firstEmpty() : -1;
+        if (shift ? slot < 0 : !empty(event.getCursor())) return;
+        ItemStack output;
+        if (creation) output = create(player.getUniqueId(), player.getName());
+        else {
+            long proposed = state(matrix[4]).charges() + 8;
+            output = roll.getAsInt() < successChance(proposed) ? withCharges(matrix[4], proposed) : null;
+        }
+        for (int i = 0; i < matrix.length; i++) {
+            matrix[i].setAmount(matrix[i].getAmount() - 1);
+            if (matrix[i].getAmount() == 0) matrix[i] = null;
+        }
+        event.getInventory().setResult(null);
+        event.getInventory().setMatrix(matrix);
+        if (output == null) {
+            Location table = event.getInventory().getLocation();
+            // Native damage/block destruction and protection events, not a cosmetic effect.
+            // Consume first: an explosion may synchronously kill the crafter or close the menu.
+            Location center = new Location(table.getWorld(), table.getBlockX() + 0.5,
+                table.getBlockY() + 0.5, table.getBlockZ() + 0.5);
+            // The shorter overload excludes its source from damage; the crafter must remain eligible.
+            table.getWorld().createExplosion(player, center, 6.0F, false, true, false);
+        } else if (shift) player.getInventory().setItem(slot, output);
+        else event.getView().setCursor(output);
+        if (creation && output != null && recipeDiscovery != null) {
+            recipeDiscovery.discoverRecharge(player);
+        }
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST)
+    public void onUse(PlayerInteractEvent event) {
+        if ((event.getAction() != Action.RIGHT_CLICK_AIR && event.getAction() != Action.RIGHT_CLICK_BLOCK)
+                || event.useItemInHand() == Event.Result.DENY || event.getHand() == null) return;
+        Player player = event.getPlayer();
+        ItemStack item = player.getInventory().getItem(event.getHand());
+        State state = state(item);
+        if (state == null || !item.equals(event.getItem())) return;
+        ItemStack normalized = normalizeAuthentic(item);
+        if (normalized != item) {
+            player.getInventory().setItem(event.getHand(), normalized);
+        }
+        event.setCancelled(true);
+        if (state.charges() == 0 || pockets.state(state.owner()).level() < 1
+                || pockets.ownerForPocketWorld(player.getWorld().getUID()).filter(state.owner()::equals).isPresent()) return;
+        var destination = pockets.availablePocketArrival(state.owner());
+        if (destination.isEmpty() || !travelling.add(player.getUniqueId())) return;
+        float fallDistance = player.getFallDistance();
+        boolean teleported = false;
+        try {
+            player.setFallDistance(0F);
+            teleported = player.teleport(destination.orElseThrow(), PlayerTeleportEvent.TeleportCause.PLUGIN);
+            if (teleported && !player.isDead() && player.getWorld().equals(destination.orElseThrow().getWorld())) {
+                spendCarriedCharge(player, state.identity());
+                if (recipeDiscovery != null) {
+                    recipeDiscovery.discoverRecharge(player);
+                }
+            }
+        } finally {
+            if (!teleported) player.setFallDistance(fallDistance);
+            travelling.remove(player.getUniqueId());
+        }
+    }
+
+    private void spendCarriedCharge(Player player, UUID identity) {
+        // Teleport listeners may move/remove the item, change the held slot, or trigger death.
+        // Never reinstall the pre-teleport snapshot over a replacement item or resurrect a drop.
+        ItemStack[] items = player.getInventory().getContents();
+        for (int slot = 0; slot < items.length; slot++) {
+            State current = state(items[slot]);
+            if (current != null && current.identity().equals(identity)) {
+                if (current.charges() > 0) player.getInventory().setItem(slot, withCharges(items[slot], current.charges() - 1));
+                return;
+            }
+        }
+        ItemStack cursor = player.getItemOnCursor();
+        State current = state(cursor);
+        if (current != null && current.identity().equals(identity) && current.charges() > 0) {
+            player.setItemOnCursor(withCharges(cursor, current.charges() - 1));
+        }
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
+    public void onDeath(PlayerDeathEvent event) {
+        Player player = event.getEntity();
+        ItemStack[] carried = player.getInventory().getContents();
+        for (int i = 0; i < carried.length; i++) {
+            if (state(carried[i]) != null) player.getInventory().setItem(i, withCharges(carried[i], 0));
+        }
+        if (state(player.getItemOnCursor()) != null) player.setItemOnCursor(withCharges(player.getItemOnCursor(), 0));
+        discharge(event.getDrops());
+        discharge(event.getItemsToKeep());
+    }
+
+    private void discharge(List<ItemStack> items) {
+        for (int i = 0; i < items.size(); i++) {
+            if (state(items.get(i)) != null) items.set(i, withCharges(items.get(i), 0));
+        }
+    }
+
+    private boolean ourRecipe(Recipe recipe) {
+        return recipe instanceof Keyed keyed
+            && (key.equals(keyed.getKey()) || rechargeKey.equals(keyed.getKey()));
+    }
+
+    private static int successChance(long proposed) {
+        return proposed >= 73 ? 10 : 100 - 10 * (int) ((proposed - 1) / 8);
+    }
+
+    private boolean rechargeCandidate(ItemStack[] matrix) {
+        if (matrix.length != 9 || !material(matrix[4], Material.COMPASS)) return false;
+        // Do not hijack ordinary map/recovery-compass recipes. Marked items still fail
+        // closed when their metadata or surrounding ingredients are malformed.
+        if (matrix[4].getItemMeta().getPersistentDataContainer().has(key)) return true;
+        for (int i = 0; i < 9; i++) if (i != 4 && !material(matrix[i], Material.ENDER_PEARL)) return false;
+        return true;
+    }
+
+    private boolean rechargeAllowed(ItemStack[] matrix, Player player, Location table) {
+        State state = matrix.length == 9 ? state(matrix[4]) : null;
+        if (state == null || state.charges() > Long.MAX_VALUE - 8 || table == null || table.getWorld() == null
+                || !table.getWorld().equals(player.getWorld())
+                || table.getBlock().getType() != Material.CRAFTING_TABLE
+                || !pockets.ownerForPocketWorld(player.getWorld().getUID()).filter(state.owner()::equals).isPresent()
+                || pockets.state(state.owner()).level() < 1) return false;
+        for (int i = 0; i < 9; i++) if (i != 4 && !material(matrix[i], Material.ENDER_PEARL)) return false;
+        return true;
+    }
+
+    boolean isAuthentic(ItemStack item) {
+        return state(item) != null;
+    }
+
+    ItemStack normalizeAuthentic(ItemStack item) {
+        if (state(item) == null) {
+            return item;
+        }
+        var meta = item.getItemMeta();
+        if (!meta.hasCustomName()) {
+            return item;
+        }
+        Component visibleTitle = meta.customName();
+        ItemStack normalized = item.clone();
+        var normalizedMeta = normalized.getItemMeta();
+        normalizedMeta.itemName(visibleTitle);
+        normalizedMeta.customName(null);
+        normalized.setItemMeta(normalizedMeta);
+        return normalized;
+    }
+
+    void normalizeCarried(Player player) {
+        normalizeStorage(player);
+        var inventory = player.getInventory();
+        ItemStack offhand = inventory.getItemInOffHand();
+        ItemStack normalizedOffhand = normalizeAuthentic(offhand);
+        if (normalizedOffhand != offhand) {
+            inventory.setItem(EquipmentSlot.OFF_HAND, normalizedOffhand);
+        }
+    }
+
+    private void normalizeStorage(Player player) {
+        var inventory = player.getInventory();
+        ItemStack[] storage = inventory.getStorageContents();
+        for (int slot = 0; slot < storage.length; slot++) {
+            ItemStack normalized = normalizeAuthentic(storage[slot]);
+            if (normalized != storage[slot]) {
+                inventory.setItem(slot, normalized);
+            }
+        }
+    }
+
+    private State state(ItemStack item) {
+        if (!material(item, Material.COMPASS) || item.getAmount() != 1) return null;
+        var meta = item.getItemMeta();
+        if (meta == null) return null;
+        var data = meta.getPersistentDataContainer();
+        try {
+            Byte marker = data.get(key, PersistentDataType.BYTE);
+            String owner = data.get(ownerKey, PersistentDataType.STRING);
+            Long charges = data.get(chargesKey, PersistentDataType.LONG);
+            String identity = data.get(identityKey, PersistentDataType.STRING);
+            if (marker == null || marker != 1 || owner == null || identity == null
+                    || charges == null || charges < 0) return null;
+            UUID ownerId = UUID.fromString(owner);
+            UUID itemId = UUID.fromString(identity);
+            if (!ownerId.toString().equals(owner) || !itemId.toString().equals(identity)) return null;
+            return new State(ownerId, charges, itemId);
+        } catch (IllegalArgumentException exception) {
+            return null;
+        }
+    }
+
+    private ItemStack withCharges(ItemStack item, long charges) {
+        ItemStack updated = normalizeAuthentic(item);
+        if (updated == item) {
+            updated = item.clone();
+        }
+        var meta = updated.getItemMeta();
+        var data = meta.getPersistentDataContainer();
+        data.set(chargesKey, PersistentDataType.LONG, charges);
+        String owner = data.get(ownerKey, PersistentDataType.STRING);
+        String name = data.getOrDefault(ownerNameKey, PersistentDataType.STRING, owner);
+        String risk = charges > Long.MAX_VALUE - 8 ? "Next recharge: unavailable (numeric overflow)"
+            : "Next recharge: " + successChance(charges + 8) + "% success / "
+                + (100 - successChance(charges + 8)) + "% explosion";
+        meta.lore(List.of(
+            Component.text("Destination: " + name + " (" + owner + ")"),
+            Component.text("Charges: " + charges),
+            Component.text("Right-click for entry only; no return trip."),
+            Component.text("Recharge: center of table + 8 ender pearls, inside destination."),
+            Component.text(risk)
+        ));
+        updated.setItemMeta(meta);
+        return updated;
+    }
+
+    private record State(UUID owner, long charges, UUID identity) {}
+
+    private static boolean empty(ItemStack item) {
+        return item == null || item.getType().isAir() || item.getAmount() == 0;
+    }
+
+    private static boolean material(ItemStack item, Material material) {
+        return item != null && item.getAmount() > 0 && item.getType() == material;
+    }
+
+    private static boolean creationMatrix(ItemStack[] matrix) {
+        if (matrix.length != 9) return false;
+        for (int i = 0; i < 9; i++) {
+            if (!material(matrix[i], i == 4 ? Material.END_CRYSTAL
+                    : i % 2 == 0 ? Material.DIAMOND_BLOCK : Material.ECHO_SHARD)) return false;
+        }
+        return true;
+    }
+
+    private ItemStack create(UUID owner, String name) {
+        ItemStack item = new ItemStack(Material.COMPASS);
+        var meta = item.getItemMeta();
+        var data = meta.getPersistentDataContainer();
+        data.set(key, PersistentDataType.BYTE, (byte) 1);
+        data.set(ownerKey, PersistentDataType.STRING, owner.toString());
+        data.set(ownerNameKey, PersistentDataType.STRING, name);
+        data.set(identityKey, PersistentDataType.STRING, UUID.randomUUID().toString());
+        data.set(chargesKey, PersistentDataType.LONG, 0L);
+        meta.itemName(Component.text("Pocket Base Sharing Compass"));
+        meta.setMaxStackSize(1);
+        item.setItemMeta(meta);
+        return withCharges(item, 0);
+    }
+}

src/main/java/games/dmg/spigotbase/PocketBaseWorldService.java

@@ -109,6 +109,13 @@ final class PocketBaseWorldService {
         world.save();
     }
 
+    Optional<Location> availableArrival(UUID ownerId) {
+        // A guest item must not recreate a missing world or grant an unlock.
+        World world = server.getWorld(worldName(ownerId));
+        return world == null ? Optional.empty()
+            : Optional.of(new Location(world, 0.5, PLATFORM_Y + 1, 5.5, 180.0f, 0.0f));
+    }
+
     Location arrival(UUID ownerId) {
         return new Location(ensureWorld(ownerId), 0.5, PLATFORM_Y + 1, 5.5, 180.0f, 0.0f);
     }

src/main/java/games/dmg/spigotbase/SpigotBasePlugin.java

@@ -2,11 +2,13 @@ package games.dmg.spigotbase;
 
 import java.io.IOException;
 import java.time.Clock;
+import java.util.ArrayList;
 import java.util.Map;
 import java.util.Objects;
 import java.util.logging.Level;
 import org.bukkit.NamespacedKey;
 import org.bukkit.command.PluginCommand;
+import org.bukkit.inventory.Recipe;
 import org.bukkit.plugin.java.JavaPlugin;
 
 public final class SpigotBasePlugin extends JavaPlugin {
@@ -18,6 +20,9 @@ public final class SpigotBasePlugin extends JavaPlugin {
     private PocketBaseManager pocketBaseManager;
     private PocketBaseController pocketBaseController;
     private PocketBaseKeystoneService keystoneService;
+    private PocketBaseSharingCompass sharingCompass;
+    private PocketBaseRecipeRegistry recipeRegistry;
+    private PocketBaseRecipeDiscovery recipeDiscovery;
     private BaseIdentificationController identificationController;
 
     @Override
@@ -53,7 +58,28 @@ public final class SpigotBasePlugin extends JavaPlugin {
                 keystoneKey,
                 getLogger()
             );
-            keystoneService.registerRecipe();
+            sharingCompass = new PocketBaseSharingCompass(getServer(), pocketBaseManager,
+                new NamespacedKey(this, "sharing_compass"),
+                () -> java.util.concurrent.ThreadLocalRandom.current().nextInt(100));
+            var recipes = new ArrayList<Recipe>();
+            recipes.add(keystoneService.recipe());
+            recipes.addAll(sharingCompass.recipes());
+            recipeRegistry = new PocketBaseRecipeRegistry(getServer(), recipes, getLogger());
+            recipeRegistry.register();
+            keystoneService.setRecipesAvailable(recipeRegistry::isAvailable);
+            keystoneService.setRecipeControl(recipeRegistry::controls);
+            sharingCompass.setRecipesAvailable(recipeRegistry::isAvailable);
+            sharingCompass.setRecipeControl(recipeRegistry::controls);
+            recipeDiscovery = new PocketBaseRecipeDiscovery(
+                recipeRegistry,
+                pocketBaseManager,
+                sharingCompass,
+                keystoneKey,
+                new NamespacedKey(this, "sharing_compass"),
+                new NamespacedKey(this, "sharing_compass_recharge"),
+                getLogger()
+            );
+            sharingCompass.setRecipeDiscovery(recipeDiscovery);
         } catch (RuntimeException | IOException exception) {
             getLogger().log(Level.SEVERE, "Could not initialize Spigot Base", exception);
             getServer().getPluginManager().disablePlugin(this);
@@ -112,6 +138,9 @@ public final class SpigotBasePlugin extends JavaPlugin {
         getServer().getPluginManager().registerEvents(teleportManager, this);
         getServer().getPluginManager().registerEvents(pocketBaseController, this);
         getServer().getPluginManager().registerEvents(keystoneService, this);
+        getServer().getPluginManager().registerEvents(sharingCompass, this);
+        getServer().getPluginManager().registerEvents(recipeDiscovery, this);
+        recipeDiscovery.reconcileOnline(getServer().getOnlinePlayers());
 
         command("setbase").setExecutor(new SetBaseCommand(
             stateManager, baseService, Clock.systemUTC(), pocketBaseController
@@ -121,7 +150,8 @@ public final class SpigotBasePlugin extends JavaPlugin {
             stateManager,
             settingsProvider,
             flightController,
-            pocketBaseManager
+            pocketBaseManager,
+            recipeDiscovery
         );
         command("basesettings").setExecutor(settingsCommand);
         command("basesettings").setTabCompleter(settingsCommand);
@@ -168,6 +198,9 @@ public final class SpigotBasePlugin extends JavaPlugin {
         if (identificationController != null) {
             identificationController.close();
         }
+        if (recipeRegistry != null) {
+            recipeRegistry.close();
+        }
         if (progressListener != null) {
             progressListener.removeAllBossBars();
         }

src/nativeTest/java/games/dmg/spigotbase/NativeBaseLabelPacketsTest.java

@@ -45,7 +45,7 @@ class NativeBaseLabelPacketsTest {
         try {
             net.minecraft.network.protocol.game.ClientboundRemoveEntitiesPacket.STREAM_CODEC.encode(buffer, remove);
             var decoded = net.minecraft.network.protocol.game.ClientboundRemoveEntitiesPacket.STREAM_CODEC.decode(buffer);
-            assertEquals(java.util.List.of(42), decoded.getEntityIds());
+            assertEquals(java.util.List.of(42), decoded.entityIds());
         } finally { buffer.release(); }
         var player = mock(org.bukkit.craftbukkit.entity.CraftPlayer.class);
         var handle = mock(net.minecraft.server.level.ServerPlayer.class);

src/nativeTest/java/games/dmg/spigotbase/NativeRecipeBookTest.java

@@ -0,0 +1,57 @@
+package games.dmg.spigotbase;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import io.netty.buffer.Unpooled;
+import net.minecraft.core.registries.Registries;
+import net.minecraft.network.FriendlyByteBuf;
+import net.minecraft.network.protocol.game.ServerboundPlaceRecipePacket;
+import net.minecraft.resources.Identifier;
+import net.minecraft.resources.ResourceKey;
+import net.minecraft.stats.ServerRecipeBook;
+import net.minecraft.world.item.crafting.Recipe;
+import net.minecraft.world.item.crafting.display.RecipeDisplayId;
+import org.junit.jupiter.api.Test;
+
+/** Native protocol/book checks pinned to the supported Purpur runtime. */
+final class NativeRecipeBookTest {
+    @Test
+    void placeRecipePacketCodecPreservesAutofillSelectionAndMode() {
+        var expected = new ServerboundPlaceRecipePacket(
+            17, new RecipeDisplayId(42), true);
+        var buffer = new FriendlyByteBuf(Unpooled.buffer());
+
+        ServerboundPlaceRecipePacket.STREAM_CODEC.encode(buffer, expected);
+        var decoded = ServerboundPlaceRecipePacket.STREAM_CODEC.decode(buffer);
+
+        assertEquals(expected, decoded);
+        assertEquals(17, decoded.containerId());
+        assertEquals(42, decoded.recipe().index());
+        assertTrue(decoded.useMaxItems());
+        assertFalse(buffer.isReadable(), "The pinned codec must consume exactly one request");
+        buffer.release();
+    }
+
+    @Test
+    void serverRecipeBookKnowledgeIsIdempotentAndCopiesAcrossLifecycle() {
+        ResourceKey<Recipe<?>> vanilla = recipeKey("minecraft:wooden_pickaxe");
+        ResourceKey<Recipe<?>> keystone = recipeKey("spigotbase:pocket_base_keystone");
+        ServerRecipeBook book = new ServerRecipeBook((recipe, consumer) -> {});
+
+        book.add(vanilla);
+        book.add(keystone);
+        book.add(keystone);
+        assertEquals(2, book.known.size());
+        assertTrue(book.contains(vanilla));
+        assertTrue(book.contains(keystone));
+
+        ServerRecipeBook reenabled = new ServerRecipeBook((recipe, consumer) -> {});
+        reenabled.copyOverData(book);
+        assertTrue(reenabled.contains(vanilla));
+        assertTrue(reenabled.contains(keystone));
+    }
+
+    private static ResourceKey<Recipe<?>> recipeKey(String value) {
+        return ResourceKey.create(Registries.RECIPE, Identifier.parse(value));
+    }
+}

src/nativeTest/java/games/dmg/spigotbase/NativeRuntime.java

@@ -27,9 +27,13 @@ import org.bukkit.craftbukkit.CraftRegistry;
 
 /** Loads vanilla registries/tags/components using the same path as the server's own tests. */
 final class NativeRuntime {
+    private static boolean initialized;
+
     private NativeRuntime() {}
 
-    static void bootstrap() throws Exception {
+    static synchronized void bootstrap() throws Exception {
+        // Paper registries are process-global and reject loading a second time.
+        if (initialized) return;
         SharedConstants.tryDetectVersion();
         Bootstrap.bootStrap();
         var flags = FeatureFlags.VANILLA_SET;
@@ -39,12 +43,12 @@ final class NativeRuntime {
         try (var resources = new MultiPackResourceManager(PackType.SERVER_DATA, packs.openAllSelected())) {
             LayeredRegistryAccess<RegistryLayer> layers = RegistryLayer.createRegistryAccess();
             List<Registry.PendingTags<?>> tags = TagLoader.loadTagsForExistingRegistries(resources, layers.getLayer(RegistryLayer.STATIC));
-            List<HolderLookup.RegistryLookup<?>> lookups = TagLoader.buildUpdatedLookups(layers.getAccessForLoading(RegistryLayer.WORLDGEN), tags);
-            RegistryAccess.Frozen worldgen = RegistryDataLoader.load(resources, lookups,
-                    RegistryDataLoader.WORLDGEN_REGISTRIES, Util.backgroundExecutor()).join();
-            layers = layers.replaceFrom(RegistryLayer.WORLDGEN, worldgen);
+            List<HolderLookup.RegistryLookup<?>> lookups = TagLoader.buildUpdatedLookups(layers.getAccessForLoading(RegistryLayer.WORLD), tags);
+            RegistryAccess.Frozen world = RegistryDataLoader.load(resources, lookups,
+                    RegistryDataLoader.WORLD_REGISTRIES, Util.backgroundExecutor()).join();
+            layers = layers.replaceFrom(RegistryLayer.WORLD, world);
             RegistryAccess.Frozen dimensions = RegistryDataLoader.load(resources,
-                    Stream.concat(lookups.stream(), worldgen.listRegistries()).toList(),
+                    Stream.concat(lookups.stream(), world.listRegistries()).toList(),
                     RegistryDataLoader.DIMENSION_REGISTRIES, Util.backgroundExecutor()).join();
             layers = layers.replaceFrom(RegistryLayer.DIMENSIONS, dimensions);
             Class.forName(org.bukkit.Registry.class.getName());
@@ -54,5 +58,6 @@ final class NativeRuntime {
             datapack.updateComponentsAndStaticRegistryTags();
             CraftRegistry.setMinecraftRegistry(layers.compositeAccess().freeze());
         }
+        initialized = true;
     }
 }

src/test/java/games/dmg/spigotbase/BaseIdentificationWiringTest.java

@@ -4,11 +4,13 @@ import static org.junit.jupiter.api.Assertions.*;
 import static org.mockito.Mockito.*;
 
 import java.nio.file.Path;
+import java.util.ArrayList;
 import java.util.List;
 import java.util.logging.Logger;
 import org.bukkit.Server;
 import org.bukkit.command.PluginCommand;
 import org.bukkit.configuration.file.YamlConfiguration;
+import org.bukkit.inventory.ShapedRecipe;
 import org.bukkit.plugin.PluginManager;
 import org.bukkit.scheduler.BukkitScheduler;
 import org.junit.jupiter.api.Test;
@@ -36,13 +38,37 @@ class BaseIdentificationWiringTest {
         doReturn(List.of()).when(server).getOnlinePlayers();
         doCallRealMethod().when(plugin).onEnable();
         doCallRealMethod().when(plugin).onDisable();
+        var settingsArguments = new ArrayList<List<?>>();
         try (var validator = mockStatic(PluginSettingsValidator.class);
-             var keystones = mockConstruction(PocketBaseKeystoneService.class);
+             var keystones = mockConstruction(PocketBaseKeystoneService.class,
+                 (service, context) -> when(service.recipe()).thenReturn(mock(ShapedRecipe.class)));
+             var sharing = mockConstruction(PocketBaseSharingCompass.class,
+                 (service, context) -> when(service.recipes()).thenReturn(
+                     List.of(mock(ShapedRecipe.class), mock(ShapedRecipe.class))));
+             var registries = mockConstruction(PocketBaseRecipeRegistry.class,
+                 (registry, context) -> when(registry.register()).thenReturn(true));
+             var discoveries = mockConstruction(PocketBaseRecipeDiscovery.class);
+             var settingsCommands = mockConstruction(BaseSettingsCommand.class,
+                 (command, context) -> settingsArguments.add(context.arguments()));
              var packets = mockConstruction(NativeBaseLabelPackets.class);
              var labels = mockConstruction(BukkitBaseLabels.class)) {
             validator.when(() -> PluginSettingsValidator.validateMaterials(any())).thenAnswer(call -> call.getArgument(0));
             plugin.onEnable();
             assertEquals(1, keystones.constructed().size());
+            assertEquals(1, sharing.constructed().size(), "Enable must install guest compasses alongside Keystones");
+            assertEquals(1, registries.constructed().size());
+            assertEquals(1, discoveries.constructed().size());
+            assertEquals(1, settingsCommands.constructed().size());
+            verify(registries.constructed().getFirst()).register();
+            verify(keystones.constructed().getFirst()).setRecipesAvailable(any());
+            verify(keystones.constructed().getFirst()).setRecipeControl(any());
+            verify(sharing.constructed().getFirst()).setRecipesAvailable(any());
+            verify(sharing.constructed().getFirst()).setRecipeControl(any());
+            verify(sharing.constructed().getFirst()).setRecipeDiscovery(discoveries.constructed().getFirst());
+            verify(discoveries.constructed().getFirst()).reconcileOnline(server.getOnlinePlayers());
+            verify(manager).registerEvents(discoveries.constructed().getFirst(), plugin);
+            verify(manager).registerEvents(sharing.constructed().getFirst(), plugin);
+            assertSame(discoveries.constructed().getFirst(), settingsArguments.getFirst().get(4));
             verify(manager, never()).disablePlugin(plugin);
             var tasks = ArgumentCaptor.forClass(Runnable.class);
             verify(scheduler, atLeastOnce()).runTaskTimer(eq(plugin), tasks.capture(), anyLong(), anyLong());
@@ -51,6 +77,7 @@ class BaseIdentificationWiringTest {
             verify(manager).registerEvents((BaseIdentificationController) identification.getFirst(), plugin);
             identification.getFirst().run();
             plugin.onDisable();
+            verify(registries.constructed().getFirst()).close();
             assertEquals(1, packets.constructed().size());
             verify(labels.constructed().getFirst()).forgetAll();
         }

src/test/java/games/dmg/spigotbase/BaseSettingsCommandTest.java

@@ -256,17 +256,20 @@ final class BaseSettingsCommandTest {
         when(pocketBases.upgrade(playerId)).thenReturn(
             new PocketBaseState(playerId, 1, java.util.Optional.empty())
         );
+        PocketBaseRecipeDiscovery discovery = mock(PocketBaseRecipeDiscovery.class);
         BaseSettingsCommand command = new BaseSettingsCommand(
             stateManager,
             new PluginSettingsProvider(PluginSettings.from(Map.of())),
             mock(BaseFlightController.class),
-            pocketBases
+            pocketBases,
+            discovery
         );
 
         command.onCommand(player, null, "basesettings", new String[] {"pocket", "upgrade"});
 
         verify(pocketBases).upgrade(playerId);
         verify(inventory).setStorageContents(any(ItemStack[].class));
+        verify(discovery).discoverCreation(player);
     }
 
     @Test
@@ -454,15 +457,18 @@ final class BaseSettingsCommandTest {
         PocketBaseManager pocketBases = mock(PocketBaseManager.class);
         when(pocketBases.state(playerId)).thenReturn(PocketBaseState.locked(playerId));
         when(pocketBases.upgrade(playerId)).thenThrow(new IOException("save failed"));
+        PocketBaseRecipeDiscovery discovery = mock(PocketBaseRecipeDiscovery.class);
         BaseSettingsCommand command = new BaseSettingsCommand(
             stateManager,
             new PluginSettingsProvider(PluginSettings.from(Map.of())),
             mock(BaseFlightController.class),
-            pocketBases
+            pocketBases,
+            discovery
         );
 
         command.onCommand(player, null, "basesettings", new String[] {"pocket", "upgrade"});
 
+        verify(discovery, never()).discoverCreation(player);
         ArgumentCaptor<ItemStack[]> contents = ArgumentCaptor.forClass(ItemStack[].class);
         verify(inventory, times(2)).setStorageContents(contents.capture());
         ItemStack[] restored = contents.getAllValues().get(1);

src/test/java/games/dmg/spigotbase/PocketBaseKeystoneServiceTest.java

@@ -99,6 +99,36 @@ final class PocketBaseKeystoneServiceTest {
         verify(inventory).setResult(null);
     }
 
+    @Test
+    void residualOwnedKeystoneRecipeFailsClosedWhenRegistrationGroupIsUnavailable() {
+        NamespacedKey key = NamespacedKey.minecraft("pocket_base_keystone");
+        UUID playerId = UUID.randomUUID();
+        Player player = mock(Player.class);
+        PrepareItemCraftEvent event = mock(PrepareItemCraftEvent.class);
+        InventoryView view = mock(InventoryView.class);
+        CraftingInventory inventory = mock(CraftingInventory.class);
+        ShapedRecipe recipe = mock(ShapedRecipe.class);
+        PocketBaseManager pocketBases = mock(PocketBaseManager.class);
+        PocketBaseKeystoneService service = new PocketBaseKeystoneService(
+            mock(Server.class), pocketBases, mock(KeystoneReturnStore.class),
+            key, Logger.getAnonymousLogger()
+        );
+        service.setRecipesAvailable(() -> false);
+        service.setRecipeControl(candidate -> true);
+        when(event.getView()).thenReturn(view);
+        when(view.getPlayer()).thenReturn(player);
+        when(event.getInventory()).thenReturn(inventory);
+        when(event.getRecipe()).thenReturn(recipe);
+        when(player.getUniqueId()).thenReturn(playerId);
+        when(pocketBases.state(playerId)).thenReturn(
+            new PocketBaseState(playerId, 1, Optional.empty())
+        );
+
+        service.onPrepareCraft(event);
+
+        verify(inventory).setResult(null);
+    }
+
     @Test
     void lockedPlayerCannotUseATransferredKeystone() throws Exception {
         NamespacedKey key = NamespacedKey.minecraft("pocket_base_keystone");

src/test/java/games/dmg/spigotbase/PocketBaseRecipeDiscoveryTest.java

@@ -0,0 +1,170 @@
+package games.dmg.spigotbase;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.Mockito.*;
+
+import java.util.HashSet;
+import java.util.List;
+import java.util.Optional;
+import java.util.Set;
+import java.util.UUID;
+import java.util.logging.Logger;
+import org.bukkit.Bukkit;
+import org.bukkit.NamespacedKey;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+import org.bukkit.event.player.PlayerJoinEvent;
+import org.bukkit.inventory.Inventory;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.PlayerInventory;
+import org.bukkit.plugin.java.JavaPlugin;
+import org.junit.jupiter.api.Test;
+
+final class PocketBaseRecipeDiscoveryTest {
+    private static final NamespacedKey KEYSTONE = NamespacedKey.minecraft("keystone");
+    private static final NamespacedKey CREATION = NamespacedKey.minecraft("sharing");
+    private static final NamespacedKey RECHARGE = NamespacedKey.minecraft("sharing_recharge");
+
+    @Test
+    void onlineReconciliationIsolatesPlayersAndRetriesMissingPostconditions() {
+        Player broken = mock(Player.class);
+        Player retrying = mock(Player.class);
+        UUID brokenId = UUID.randomUUID();
+        UUID retryingId = UUID.randomUUID();
+        PocketBaseManager pockets = mock(PocketBaseManager.class);
+        PocketBaseSharingCompass sharing = mock(PocketBaseSharingCompass.class);
+        PocketBaseRecipeRegistry registry = mock(PocketBaseRecipeRegistry.class);
+        when(registry.isAvailable()).thenReturn(true);
+        when(broken.getUniqueId()).thenReturn(brokenId);
+        when(retrying.getUniqueId()).thenReturn(retryingId);
+        when(pockets.state(brokenId)).thenReturn(new PocketBaseState(brokenId, 1, Optional.empty()));
+        when(pockets.state(retryingId)).thenReturn(new PocketBaseState(retryingId, 1, Optional.empty()));
+        when(broken.hasDiscoveredRecipe(any())).thenThrow(new IllegalStateException("broken book"));
+        when(retrying.hasDiscoveredRecipe(any())).thenReturn(false);
+        PocketBaseRecipeDiscovery discovery = new PocketBaseRecipeDiscovery(
+            registry, pockets, sharing, KEYSTONE, CREATION, RECHARGE,
+            Logger.getAnonymousLogger());
+
+        discovery.reconcileOnline(List.of(broken, retrying));
+        discovery.reconcileOnline(List.of(retrying));
+
+        verify(retrying, times(2)).discoverRecipe(KEYSTONE);
+        verify(retrying, times(2)).discoverRecipe(CREATION);
+    }
+
+    @Test
+    void completeCharacterResetPreservesPocketAndVanillaRecipeKnowledge() {
+        UUID playerId = UUID.randomUUID();
+        NamespacedKey vanilla = NamespacedKey.minecraft("wooden_pickaxe");
+        Set<NamespacedKey> known = new HashSet<>(Set.of(vanilla, KEYSTONE, CREATION, RECHARGE));
+        Player player = mock(Player.class);
+        PlayerInventory inventory = mock(PlayerInventory.class);
+        CommandSender administrator = mock(CommandSender.class);
+        BaseStateManager states = mock(BaseStateManager.class);
+        PocketBaseManager pockets = mock(PocketBaseManager.class);
+        PocketBaseSharingCompass sharing = mock(PocketBaseSharingCompass.class);
+        PocketBaseRecipeRegistry registry = mock(PocketBaseRecipeRegistry.class);
+        PlayerState character = PlayerState.newPlayer(playerId, "Builder");
+        when(administrator.hasPermission("spigotbase.admin")).thenReturn(true);
+        when(player.getUniqueId()).thenReturn(playerId);
+        when(player.getName()).thenReturn("Builder");
+        when(player.getInventory()).thenReturn(inventory);
+        when(inventory.getStorageContents()).thenReturn(new ItemStack[0]);
+        when(inventory.getItemInOffHand()).thenReturn(null);
+        when(states.player(playerId, "Builder")).thenReturn(character);
+        when(pockets.state(playerId)).thenReturn(new PocketBaseState(playerId, 1, Optional.empty()));
+        when(registry.isAvailable()).thenReturn(true);
+        when(player.hasDiscoveredRecipe(any())).thenAnswer(call -> known.contains(call.getArgument(0)));
+        BaseAdminCommand reset = new BaseAdminCommand(
+            mock(JavaPlugin.class), states, mock(AdminProgressionService.class),
+            new PluginSettingsProvider(PluginSettings.from(java.util.Map.of())));
+        PocketBaseRecipeDiscovery discovery = new PocketBaseRecipeDiscovery(
+            registry, pockets, sharing, KEYSTONE, CREATION, RECHARGE,
+            Logger.getAnonymousLogger());
+
+        try (var bukkit = mockStatic(Bukkit.class)) {
+            bukkit.when(() -> Bukkit.getPlayerExact("Builder")).thenReturn(player);
+            reset.onCommand(administrator, null, "baseadmin",
+                new String[] {"reset", "Builder", "all", "confirm"});
+        }
+        discovery.reconcile(player);
+
+        assertEquals(Set.of(vanilla, KEYSTONE, CREATION, RECHARGE), known);
+        verify(player, never()).undiscoverRecipe(any());
+        verify(player, never()).undiscoverRecipes(any());
+        verify(player, never()).discoverRecipe(any());
+        verify(pockets).state(playerId);
+    }
+
+    @Test
+    void joinReconciliationUsesOnlyStorageHotbarAndOffhandForAuthenticPossession() {
+        UUID playerId = UUID.randomUUID();
+        Player player = mock(Player.class);
+        PlayerInventory inventory = mock(PlayerInventory.class);
+        Inventory enderChest = mock(Inventory.class);
+        ItemStack authentic = mock(ItemStack.class);
+        ItemStack nameOnly = mock(ItemStack.class);
+        PocketBaseManager pockets = mock(PocketBaseManager.class);
+        PocketBaseSharingCompass sharing = mock(PocketBaseSharingCompass.class);
+        PocketBaseRecipeRegistry registry = mock(PocketBaseRecipeRegistry.class);
+        Set<NamespacedKey> known = new HashSet<>();
+        when(registry.isAvailable()).thenReturn(true);
+        when(player.getUniqueId()).thenReturn(playerId);
+        when(player.getInventory()).thenReturn(inventory);
+        when(player.getEnderChest()).thenReturn(enderChest);
+        when(player.getItemOnCursor()).thenReturn(authentic);
+        when(inventory.getArmorContents()).thenReturn(new ItemStack[] {authentic});
+        when(enderChest.getContents()).thenReturn(new ItemStack[] {authentic});
+        when(inventory.getStorageContents()).thenReturn(new ItemStack[] {nameOnly});
+        when(inventory.getItemInOffHand()).thenReturn(null, authentic);
+        when(sharing.isAuthentic(authentic)).thenReturn(true);
+        when(sharing.isAuthentic(nameOnly)).thenReturn(false);
+        when(pockets.state(playerId)).thenReturn(PocketBaseState.locked(playerId));
+        when(player.hasDiscoveredRecipe(any())).thenAnswer(call -> known.contains(call.getArgument(0)));
+        when(player.discoverRecipe(any())).thenAnswer(call -> known.add(call.getArgument(0)));
+        PocketBaseRecipeDiscovery discovery = new PocketBaseRecipeDiscovery(
+            registry, pockets, sharing, KEYSTONE, CREATION, RECHARGE,
+            Logger.getAnonymousLogger());
+
+        discovery.onJoin(new PlayerJoinEvent(player, "joined"));
+        assertTrue(known.isEmpty(), "Armor, cursor, Ender Chest and name-only items are excluded");
+        discovery.onJoin(new PlayerJoinEvent(player, "joined again"));
+        assertEquals(Set.of(RECHARGE), known, "An authentic offhand compass earns recharge knowledge");
+        verify(player, never()).getItemOnCursor();
+        verify(player, never()).getEnderChest();
+        verify(inventory, never()).getArmorContents();
+    }
+
+    @Test
+    void eligibleOwnerWithAuthenticStoredCompassDiscoversEachRecipeOnlyOnce() {
+        UUID playerId = UUID.randomUUID();
+        Player player = mock(Player.class);
+        PlayerInventory inventory = mock(PlayerInventory.class);
+        ItemStack authentic = mock(ItemStack.class);
+        PocketBaseManager pockets = mock(PocketBaseManager.class);
+        PocketBaseSharingCompass sharing = mock(PocketBaseSharingCompass.class);
+        PocketBaseRecipeRegistry registry = mock(PocketBaseRecipeRegistry.class);
+        Set<NamespacedKey> known = new HashSet<>();
+        when(registry.isAvailable()).thenReturn(true);
+        when(player.getUniqueId()).thenReturn(playerId);
+        when(player.getInventory()).thenReturn(inventory);
+        when(inventory.getStorageContents()).thenReturn(new ItemStack[] {authentic});
+        when(inventory.getItemInOffHand()).thenReturn(null);
+        when(sharing.isAuthentic(authentic)).thenReturn(true);
+        when(pockets.state(playerId)).thenReturn(new PocketBaseState(playerId, 1, Optional.empty()));
+        when(player.hasDiscoveredRecipe(any())).thenAnswer(call -> known.contains(call.getArgument(0)));
+        when(player.discoverRecipe(any())).thenAnswer(call -> known.add(call.getArgument(0)));
+        PocketBaseRecipeDiscovery discovery = new PocketBaseRecipeDiscovery(
+            registry, pockets, sharing, KEYSTONE, CREATION, RECHARGE,
+            Logger.getAnonymousLogger());
+
+        discovery.reconcile(player);
+        discovery.reconcile(player);
+
+        assertEquals(Set.of(KEYSTONE, CREATION, RECHARGE), known);
+        verify(player).discoverRecipe(KEYSTONE);
+        verify(player).discoverRecipe(CREATION);
+        verify(player).discoverRecipe(RECHARGE);
+        verify(player, never()).undiscoverRecipe(any());
+    }
+}

src/test/java/games/dmg/spigotbase/PocketBaseRecipeRegistryTest.java

@@ -0,0 +1,267 @@
+package games.dmg.spigotbase;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.Mockito.*;
+
+import java.util.List;
+import java.util.Map;
+import java.util.logging.Logger;
+import org.bukkit.Keyed;
+import org.bukkit.NamespacedKey;
+import org.bukkit.Server;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.Recipe;
+import org.bukkit.inventory.RecipeChoice;
+import org.bukkit.inventory.ShapedRecipe;
+import org.junit.jupiter.api.Test;
+
+final class PocketBaseRecipeRegistryTest {
+    @Test
+    void allThreeRegisterAsOneOwnedFailClosedGroupWithoutTouchingConflicts() {
+        NamespacedKey keystone = NamespacedKey.minecraft("keystone");
+        NamespacedKey creation = NamespacedKey.minecraft("sharing");
+        NamespacedKey recharge = NamespacedKey.minecraft("sharing_recharge");
+        Recipe first = recipe(keystone);
+        Recipe conflict = recipe(creation);
+        Recipe unattempted = recipe(recharge);
+        Server server = mock(Server.class);
+        when(server.addRecipe(first)).thenReturn(true);
+        when(server.addRecipe(conflict)).thenReturn(false);
+        when(server.getRecipe(keystone)).thenReturn(first);
+        when(server.removeRecipe(keystone)).thenReturn(true);
+        PocketBaseRecipeRegistry registry = new PocketBaseRecipeRegistry(
+            server, List.of(first, conflict, unattempted), Logger.getAnonymousLogger());
+
+        assertFalse(registry.register());
+        assertFalse(registry.isAvailable());
+        verify(server).removeRecipe(keystone);
+        verify(server, never()).removeRecipe(creation);
+        verify(server, never()).removeRecipe(recharge);
+        verify(server, never()).addRecipe(unattempted);
+
+        registry.close();
+        verify(server).removeRecipe(keystone);
+
+        Server successfulServer = mock(Server.class);
+        when(successfulServer.addRecipe(any())).thenReturn(true);
+        when(successfulServer.getRecipe(keystone)).thenReturn(first);
+        when(successfulServer.getRecipe(creation)).thenReturn(conflict);
+        when(successfulServer.getRecipe(recharge)).thenReturn(unattempted);
+        when(successfulServer.removeRecipe(any())).thenReturn(true);
+        PocketBaseRecipeRegistry successful = new PocketBaseRecipeRegistry(
+            successfulServer, List.of(first, conflict, unattempted), Logger.getAnonymousLogger());
+        assertTrue(successful.register());
+        assertTrue(successful.isAvailable());
+        successful.close();
+        verify(successfulServer).removeRecipe(keystone);
+        verify(successfulServer).removeRecipe(creation);
+        verify(successfulServer).removeRecipe(recharge);
+    }
+
+    @Test
+    void registrationDefinitionsReceiveUniqueLifecycleProvenanceGroups() {
+        ItemStack result = mock(ItemStack.class);
+        RecipeChoice choice = mock(RecipeChoice.class);
+        ShapedRecipe first = shapedRecipe(
+            NamespacedKey.minecraft("first"), result, choice);
+        ShapedRecipe second = shapedRecipe(
+            NamespacedKey.minecraft("second"), result, choice);
+        ShapedRecipe third = shapedRecipe(
+            NamespacedKey.minecraft("third"), result, choice);
+
+        new PocketBaseRecipeRegistry(
+            mock(Server.class), List.of(first, second, third), Logger.getAnonymousLogger());
+
+        var groups = org.mockito.ArgumentCaptor.forClass(String.class);
+        verify(first).setGroup(groups.capture());
+        verify(second).setGroup(groups.capture());
+        verify(third).setGroup(groups.capture());
+        assertEquals(3, groups.getAllValues().stream().distinct().count());
+        assertTrue(groups.getAllValues().stream()
+            .allMatch(group -> group.startsWith("spigotbase-owned-")));
+    }
+
+    @Test
+    void cleanupPreservesALaterForeignReplacementUnderAnOwnedKey() {
+        NamespacedKey replacedKey = NamespacedKey.minecraft("replaced");
+        NamespacedKey retainedKey = NamespacedKey.minecraft("retained");
+        NamespacedKey thirdKey = NamespacedKey.minecraft("third");
+        Recipe replaced = recipe(replacedKey);
+        Recipe replacement = recipe(replacedKey);
+        Recipe retained = recipe(retainedKey);
+        Recipe third = recipe(thirdKey);
+        Server server = mock(Server.class);
+        when(server.addRecipe(any())).thenReturn(true);
+        when(server.getRecipe(replacedKey)).thenReturn(replacement);
+        when(server.getRecipe(retainedKey)).thenReturn(retained);
+        when(server.getRecipe(thirdKey)).thenReturn(third);
+        when(server.removeRecipe(any())).thenReturn(true);
+        PocketBaseRecipeRegistry registry = new PocketBaseRecipeRegistry(
+            server, List.of(replaced, retained, third), Logger.getAnonymousLogger());
+        assertTrue(registry.register());
+
+        registry.close();
+
+        verify(server, never()).removeRecipe(replacedKey);
+        verify(server).removeRecipe(retainedKey);
+        verify(server).removeRecipe(thirdKey);
+    }
+
+    @Test
+    void cleanupRemovesAnActiveStructuralCopyOfTheOwnedDefinition() {
+        NamespacedKey firstKey = NamespacedKey.minecraft("structural");
+        ItemStack result = mock(ItemStack.class);
+        RecipeChoice choice = mock(RecipeChoice.class);
+        ShapedRecipe definition = shapedRecipe(firstKey, result, choice);
+        ShapedRecipe activeCopy = shapedRecipe(firstKey, result, choice);
+        Recipe second = recipe(NamespacedKey.minecraft("second"));
+        Recipe third = recipe(NamespacedKey.minecraft("third"));
+        Server server = mock(Server.class);
+        when(server.addRecipe(any())).thenReturn(true);
+        when(server.getRecipe(firstKey)).thenReturn(activeCopy);
+        when(server.getRecipe(((Keyed) second).getKey())).thenReturn(second);
+        when(server.getRecipe(((Keyed) third).getKey())).thenReturn(third);
+        when(server.removeRecipe(any())).thenReturn(true);
+        PocketBaseRecipeRegistry registry = new PocketBaseRecipeRegistry(
+            server, List.of(definition, second, third), Logger.getAnonymousLogger());
+        assertTrue(registry.register());
+
+        registry.close();
+
+        verify(server).removeRecipe(firstKey);
+    }
+
+    @Test
+    void runtimeSymbolRenamingStillMatchesTheOwnedIngredientGrid() {
+        NamespacedKey firstKey = NamespacedKey.minecraft("renamed-symbols");
+        ItemStack result = mock(ItemStack.class);
+        RecipeChoice firstChoice = mock(RecipeChoice.class);
+        RecipeChoice secondChoice = mock(RecipeChoice.class);
+        ShapedRecipe definition = shapedRecipe(firstKey, result,
+            new String[] {"ABA", "BAB", "ABA"},
+            Map.of('A', firstChoice, 'B', secondChoice));
+        ShapedRecipe activeCopy = shapedRecipe(firstKey, result,
+            new String[] {"abc", "def", "ghi"},
+            Map.of(
+                'a', firstChoice, 'b', secondChoice, 'c', firstChoice,
+                'd', secondChoice, 'e', firstChoice, 'f', secondChoice,
+                'g', firstChoice, 'h', secondChoice, 'i', firstChoice));
+        Recipe second = recipe(NamespacedKey.minecraft("second"));
+        Recipe third = recipe(NamespacedKey.minecraft("third"));
+        Server server = mock(Server.class);
+        when(server.addRecipe(any())).thenReturn(true);
+        when(server.getRecipe(firstKey)).thenReturn(activeCopy);
+        when(server.getRecipe(((Keyed) second).getKey())).thenReturn(second);
+        when(server.getRecipe(((Keyed) third).getKey())).thenReturn(third);
+        when(server.removeRecipe(any())).thenReturn(true);
+        PocketBaseRecipeRegistry registry = new PocketBaseRecipeRegistry(
+            server, List.of(definition, second, third), Logger.getAnonymousLogger());
+        assertTrue(registry.register());
+
+        assertTrue(registry.isAvailable());
+        assertTrue(registry.controls(activeCopy));
+        registry.close();
+        verify(server).removeRecipe(firstKey);
+    }
+
+    @Test
+    void failedOwnedCleanupIsRetriedOnDisableWithoutTouchingTheConflict() {
+        NamespacedKey owned = NamespacedKey.minecraft("owned");
+        NamespacedKey conflict = NamespacedKey.minecraft("conflict");
+        Recipe first = recipe(owned);
+        Recipe second = recipe(conflict);
+        Recipe third = recipe(NamespacedKey.minecraft("third"));
+        Server server = mock(Server.class);
+        when(server.addRecipe(first)).thenReturn(true);
+        when(server.addRecipe(second)).thenReturn(false);
+        when(server.getRecipe(owned)).thenReturn(first);
+        when(server.removeRecipe(owned))
+            .thenThrow(new IllegalStateException("temporary cleanup failure"))
+            .thenReturn(true);
+        PocketBaseRecipeRegistry registry = new PocketBaseRecipeRegistry(
+            server, List.of(first, second, third), Logger.getAnonymousLogger());
+
+        assertFalse(registry.register());
+        assertTrue(registry.controls(first),
+            "A failed-removal residual must remain controlled while active");
+        registry.close();
+        assertFalse(registry.controls(first));
+
+        verify(server, times(2)).removeRecipe(owned);
+        verify(server, never()).removeRecipe(conflict);
+    }
+
+    @Test
+    void falseRemovalResultRetainsOwnershipForDisableRetry() {
+        NamespacedKey owned = NamespacedKey.minecraft("false-removal");
+        Recipe first = recipe(owned);
+        Recipe conflict = recipe(NamespacedKey.minecraft("conflict"));
+        Recipe third = recipe(NamespacedKey.minecraft("third"));
+        Server server = mock(Server.class);
+        when(server.addRecipe(first)).thenReturn(true);
+        when(server.addRecipe(conflict)).thenReturn(false);
+        when(server.getRecipe(owned)).thenReturn(first);
+        when(server.removeRecipe(owned)).thenReturn(false, true);
+        PocketBaseRecipeRegistry registry = new PocketBaseRecipeRegistry(
+            server, List.of(first, conflict, third), Logger.getAnonymousLogger());
+
+        assertFalse(registry.register());
+        assertTrue(registry.controls(first));
+        registry.close();
+        assertFalse(registry.controls(first));
+        verify(server, times(2)).removeRecipe(owned);
+    }
+
+    @Test
+    void postInsertionRegistrationExceptionOwnsAndRollsBackTheInsertedRecipe() {
+        NamespacedKey firstKey = NamespacedKey.minecraft("first");
+        NamespacedKey insertedKey = NamespacedKey.minecraft("inserted-before-exception");
+        Recipe first = recipe(firstKey);
+        Recipe inserted = recipe(insertedKey);
+        Recipe third = recipe(NamespacedKey.minecraft("third"));
+        Server server = mock(Server.class);
+        when(server.addRecipe(first)).thenReturn(true);
+        when(server.addRecipe(inserted))
+            .thenThrow(new IllegalStateException("reload failed after insertion"));
+        when(server.getRecipe(firstKey)).thenReturn(first);
+        when(server.getRecipe(insertedKey)).thenReturn(inserted);
+        when(server.removeRecipe(any())).thenReturn(true);
+        PocketBaseRecipeRegistry registry = new PocketBaseRecipeRegistry(
+            server, List.of(first, inserted, third), Logger.getAnonymousLogger());
+
+        assertFalse(registry.register());
+
+        verify(server).removeRecipe(firstKey);
+        verify(server).removeRecipe(insertedKey);
+        verify(server, never()).addRecipe(third);
+        assertFalse(registry.controls(inserted));
+    }
+
+    private static ShapedRecipe shapedRecipe(
+            NamespacedKey key, ItemStack result, RecipeChoice choice) {
+        return shapedRecipe(key, result, new String[] {"A"}, Map.of('A', choice));
+    }
+
+    private static ShapedRecipe shapedRecipe(
+            NamespacedKey key,
+            ItemStack result,
+            String[] shape,
+            Map<Character, RecipeChoice> choices
+    ) {
+        ShapedRecipe recipe = mock(ShapedRecipe.class);
+        when(recipe.getKey()).thenReturn(key);
+        when(recipe.getResult()).thenReturn(result);
+        when(recipe.getShape()).thenReturn(shape);
+        when(recipe.getGroup()).thenReturn("");
+        when(recipe.getCategory()).thenReturn(
+            org.bukkit.inventory.recipe.CraftingBookCategory.MISC);
+        when(recipe.getChoiceMap()).thenReturn(choices);
+        return recipe;
+    }
+
+    private static Recipe recipe(NamespacedKey key) {
+        Recipe recipe = mock(Recipe.class, withSettings().extraInterfaces(Keyed.class));
+        when(((Keyed) recipe).getKey()).thenReturn(key);
+        return recipe;
+    }
+}

src/test/java/games/dmg/spigotbase/PurpurDistributionTest.java

@@ -0,0 +1,73 @@
+package games.dmg.spigotbase;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import java.io.DataInputStream;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.List;
+import java.util.Map;
+import java.util.jar.JarFile;
+import org.junit.jupiter.api.Test;
+import org.yaml.snakeyaml.Yaml;
+
+/** Distribution branding is deliberately independent of persistent/runtime plugin identity. */
+class PurpurDistributionTest {
+    @Test
+    void packagesJava25UnderNewNameWithoutChangingRuntimeIdentityOrBundlingTheApi() throws Exception {
+        Path artifact = Path.of(System.getProperty("distribution.jar"));
+        String version = System.getProperty("distribution.version");
+        assertEquals("purpur-base-" + version + ".jar", artifact.getFileName().toString());
+        try (var jar = new JarFile(artifact.toFile())) {
+            Map<?, ?> metadata = new Yaml().load(jar.getInputStream(jar.getJarEntry("plugin.yml")));
+            assertEquals(version, metadata.get("version"));
+            assertEquals("SpigotBase", metadata.get("name"), "Do not orphan the existing plugin data folder or default namespace");
+            assertEquals("games.dmg.spigotbase.SpigotBasePlugin", metadata.get("main"));
+            assertTrue(((Map<?, ?>) metadata.get("permissions")).containsKey("spigotbase.admin"));
+            assertNotNull(jar.getJarEntry("games/dmg/spigotbase/PocketBaseRecipeRegistry.class"));
+            assertNotNull(jar.getJarEntry("games/dmg/spigotbase/PocketBaseRecipeDiscovery.class"));
+            try (var bytecode = new DataInputStream(jar.getInputStream(
+                jar.getJarEntry("games/dmg/spigotbase/SpigotBasePlugin.class")))) {
+                assertEquals(0xCAFEBABE, bytecode.readInt());
+                bytecode.readUnsignedShort();
+                assertEquals(69, bytecode.readUnsignedShort(), "Plugin bytecode must target Java 25");
+            }
+            List<String> forbiddenPrefixes = List.of(
+                "com/comphenix/protocol/",
+                "com/destroystokyo/paper/",
+                "io/papermc/",
+                "net/minecraft/",
+                "org/bukkit/",
+                "org/purpurmc/",
+                "org/spigotmc/",
+                "mockito-extensions/"
+            );
+            assertFalse(jar.stream().anyMatch(entry -> forbiddenPrefixes.stream().anyMatch(entry.getName()::startsWith)
+                || entry.getName().endsWith("Test.class")
+                || entry.getName().equals("games/dmg/spigotbase/NativeRuntime.class")));
+        }
+    }
+
+    @Test
+    void releaseAndCiAgreeWithThePurpurDistributionNameAndToolchain() throws Exception {
+        String build = Files.readString(Path.of("build.gradle.kts"));
+        assertTrue(build.contains("purpur-api:26.3.build.2651-stable"));
+        assertTrue(build.contains("purpur-26.3-2651.jar"));
+        assertTrue(build.contains("https://api.purpurmc.org/v2/purpur/26.3/2651/download"));
+        assertTrue(build.contains("0677c1febecfbc2e5b0a7f76abd647b70a1f38d3cbdf3dd6a82e401b4262a598"));
+        assertFalse(build.contains("26.2"));
+        assertFalse(build.contains("2618"));
+        assertFalse(build.contains("org.spigotmc:spigot-api"));
+
+        String readme = Files.readString(Path.of("README.md"));
+        assertTrue(readme.contains("Purpur 26.3 build 2651"));
+        assertFalse(readme.contains("Purpur 26.2"));
+        assertFalse(readme.contains("2618"));
+        for (String workflow : new String[] {"ci.yml", "release.yml"}) {
+            String content = Files.readString(Path.of(".gitea/workflows", workflow));
+            assertTrue(content.contains("java-version: 25"));
+            assertTrue(content.contains("purpur-base-"), workflow + " must publish the renamed distribution");
+            assertFalse(content.contains("spigot-base-"), workflow + " must not look for the old JAR filename");
+        }
+    }
+}

src/test/java/games/dmg/spigotbase/SharingCompassDestinationTest.java

@@ -0,0 +1,35 @@
+package games.dmg.spigotbase;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.Mockito.*;
+
+import java.nio.file.Path;
+import java.util.Map;
+import java.util.UUID;
+import org.bukkit.Location;
+import org.bukkit.Server;
+import org.bukkit.World;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+class SharingCompassDestinationTest {
+    @TempDir Path directory;
+
+    @Test void destinationUsesPersistedUnlockAndLoadedWorldWithoutCreatingMissingWorlds() throws Exception {
+        UUID owner = UUID.randomUUID();
+        var repository = new YamlPocketBaseRepository(directory.resolve("pockets.yml"));
+        var states = new PocketBaseStateManager(repository);
+        states.updateAndSave(owner, state -> state.withLevel(1));
+        var server = mock(Server.class);
+        var settings = new PluginSettingsProvider(PluginSettings.from(Map.of()));
+        var worlds = new PocketBaseWorldService(server, settings);
+        var manager = new PocketBaseManager(new PocketBaseStateManager(repository), worlds, settings);
+        assertTrue(manager.availablePocketArrival(owner).isEmpty());
+        verify(server, never()).createWorld(any());
+        var world = mock(World.class);
+        when(server.getWorld("spigot_base_pocket_" + owner.toString().replace("-", ""))).thenReturn(world);
+        assertEquals(new Location(world, .5, 65, 5.5, 180F, 0F), manager.availablePocketArrival(owner).orElseThrow());
+        assertTrue(manager.availablePocketArrival(UUID.randomUUID()).isEmpty());
+        verify(server, never()).createWorld(any());
+    }
+}