fix(contracts): wire home-page clear action and hide completed one-time contracts

- add /souls tracker give <player> <target> as an admin-only command
- reuse the existing TrackerCompassService so the command uses the same tracker behavior and duration as kill-granted compasses
- gate the command behind soulsteal.admin
- update README.md command reference
- update docs/PROJECT.md with tracker compass behavior and the new admin command
- keep the implementation scoped to the command layer without changing the tracker service API

README.md

@@ -2,6 +2,8 @@
 
 Soul Steal is a server-side Fabric mod that adds a configurable soul economy, bounties, tracker compasses, and a vanilla-compatible soul shop.
 
+Full project documentation is available in [docs/PROJECT.md](docs/PROJECT.md).
+
 ## Requirements
 
 | Requirement | Value |
@@ -13,7 +15,7 @@ Soul Steal is a server-side Fabric mod that adds a configurable soul economy, bo
 
 ## How It Works
 
-Players gain souls for killing other players and lose souls whenever they die, with all values driven by `config.yml`. The bounty system lets players spend souls to place timed bounties that pay killers on claim or reward survivors on expiry, while wanted players can see a bounty timer bossbar. The optional HUD sidebar can be toggled per player, and `/souls top` shows the configured leaderboard. The shop is a server-side chest GUI with a category home page, arrow pagination, optional reward display names, and item listings that can open a quantity selector.
+Players gain souls for killing other players and lose souls whenever they die, with all values driven by `config.yml`. The bounty system lets players spend souls to place timed bounties that pay killers on claim or reward survivors on expiry, while wanted players can see a bounty timer bossbar. The optional HUD sidebar can be toggled per player, uses the same dark aqua title styling as the mod prefix, color-codes the visible lines, and only shows contract or bounty rows when they are actually active. `/souls top` shows the configured leaderboard. The shop is a server-side chest GUI with a category home page, arrow pagination, optional reward display names, and item listings that can open a quantity selector.
 
 ## Commands
 
@@ -27,6 +29,10 @@ Players gain souls for killing other players and lose souls whenever they die, w
 | `/souls bounty list [player]` | All players | Lists active bounties globally or for one target. |
 | `/souls scoreboard [toggle|on|off]` | All players | Toggles the optional Soul Steal sidebar HUD for your player. |
 | `/souls top [page]` | All players | Shows the soul leaderboard using the configured page size. |
+| `/souls tracker give <player> <target>` | Admins / `soulsteal.admin` | Gives a tracker compass to one player that points at another player. |
+| `/souls contracts` | All players | Opens the contract browser GUI. |
+| `/souls contracts selected` | All players | Shows the currently selected contract and progress. |
+| `/souls contracts clear` | All players | Clears your selected contract. |
 | `/souls reload` | Admins / `soulsteal.admin` or `soulsteal.admin.reload` | Reloads `config.yml` and `shop.yml` without restarting the server. |
 | `/souls set|add|take <player> <amount>` | Admins / `soulsteal.admin` or the matching `soulsteal.admin.balance.*` node | Directly manages a player's soul balance. |
 
@@ -36,4 +42,5 @@ Players gain souls for killing other players and lose souls whenever they die, w
 | --- | --- |
 | `config/soulsteal/config.yml` | Economy values, death penalties, bounty limits, HUD toggles, leaderboard size, bossbar text, and command permission nodes. |
 | `config/soulsteal/shop.yml` | Shop categories, GUI entries, prices, cooldowns, reward display names, and optional custom-amount settings for item listings. |
+| `config/soulsteal/catalog.yml` | Grouped mining and hunting contract sections, internal ids, player-facing names, icons, targets, progress amounts, rewards, and repeatable/one-time behavior. |
 | `config/soulsteal/soulsteal-data.json` | Persistent balances, active bounties, cooldowns, unlocks, internal permission fallback storage, saved player names, and scoreboard preferences. |

docs/PROJECT.md

@@ -0,0 +1,341 @@
+# Soul Steal Project Documentation
+
+## Overview
+
+Soul Steal is a server-side Fabric mod that implements a soul economy, player bounties, tracker compasses, a vanilla-style shop GUI, optional HUD elements, and permission-backed admin controls.
+
+The mod is built to run entirely on the server. Players do not need a client mod to use the commands or the shop.
+
+## Runtime Architecture
+
+The entry point is [`SoulStealMod`](../src/main/java/com/g2806/soulsteal/SoulStealMod.java), which performs four jobs:
+
+1. Loads configuration from `config/soulsteal/config.yml`.
+2. Loads persistent player data from `config/soulsteal/soulsteal-data.json`.
+3. Instantiates the feature services.
+4. Registers command, tick, join, death, and disconnect handlers.
+
+The main services are:
+
+- [`SoulService`](../src/main/java/com/g2806/soulsteal/service/SoulService.java): balance reads and mutations.
+- [`BountyService`](../src/main/java/com/g2806/soulsteal/service/BountyService.java): bounty placement, expiry, and kill claims.
+- [`TrackerCompassService`](../src/main/java/com/g2806/soulsteal/service/TrackerCompassService.java): temporary tracking compasses for player kills.
+- [`ShopService`](../src/main/java/com/g2806/soulsteal/service/ShopService.java): server-side shop GUI and purchases.
+- [`RewardService`](../src/main/java/com/g2806/soulsteal/service/RewardService.java): validates and grants rewards from shop entries.
+- [`PermissionService`](../src/main/java/com/g2806/soulsteal/service/PermissionService.java): permission lookups and fallback storage.
+- [`HudService`](../src/main/java/com/g2806/soulsteal/service/HudService.java): scoreboard sidebar, leaderboard, and bounty bossbar.
+
+Shared utilities:
+
+- [`SoulTexts`](../src/main/java/com/g2806/soulsteal/util/SoulTexts.java): formatted feedback, success, warning, and error messages.
+- [`DurationFormatter`](../src/main/java/com/g2806/soulsteal/util/DurationFormatter.java): human-readable duration strings.
+
+## Feature Summary
+
+### Soul Economy
+
+Players have a soul balance stored per UUID.
+
+- Killing another player can grant souls.
+- Dying can remove souls using configurable flat and percentage penalties.
+- Transfers between players can be enabled or disabled in config.
+- Admin commands can set, add, or remove balances directly.
+
+Implemented by:
+
+- [`SoulService`](../src/main/java/com/g2806/soulsteal/service/SoulService.java)
+- [`SoulCommandRegistrar`](../src/main/java/com/g2806/soulsteal/command/SoulCommandRegistrar.java)
+
+### Bounties
+
+Players can place timed bounties on other players using their souls as the payment source.
+
+Behavior:
+
+- Placement is bounded by min/max value, min/max duration, cooldowns, and active bounty limits.
+- Killing the target claims all active bounties on that target.
+- If a bounty expires, the target receives a configured survivor payout.
+- Bounties are cleared if the target dies to non-player damage and no killer claims them.
+
+Implemented by:
+
+- [`BountyService`](../src/main/java/com/g2806/soulsteal/service/BountyService.java)
+- [`SoulStealMod`](../src/main/java/com/g2806/soulsteal/SoulStealMod.java)
+
+### Tracker Compasses
+
+When enabled, killing a player grants a temporary tracker compass.
+
+Behavior:
+
+- The compass tracks the killed player using lodestone-tracker data.
+- The item stores target UUID, target name, and expiration time in custom NBT.
+- Expired compasses are removed during server ticks.
+- Optional behavior can remove the compass if the target is offline.
+
+Admins can also grant a tracker compass directly with `/souls tracker give <player> <target>`. This uses the same tracker data and duration as the kill-granted version.
+
+### Contracts
+
+Contracts let players earn souls without PvP by completing mining and hunting goals.
+
+Behavior:
+
+- Players pick one active contract at a time.
+- Mining contracts track block breaks against a configured block id.
+- Hunting contracts track kills against a configured entity id.
+- The selected contract and its progress appear in the HUD sidebar.
+- Completing a contract pays souls automatically.
+- One-time contracts disappear from the browser after completion and cannot be selected again.
+- The contract browser uses `catalog.yml`, where the YAML key is the internal contract id and `name` is the player-facing label.
+- Contract entries are organized under `contracts: mining:` and `contracts: hunting:` sections for readability, while still using per-entry ids.
+- The contract browser uses a bottom control row like the shop, including page navigation anchored to the bottom of the inventory.
+- The contract browser includes a clear-selection action on the home page and inside contract categories so players can remove their active contract from the GUI.
+
+Implemented by:
+
+- [`ContractService`](../src/main/java/com/g2806/soulsteal/service/ContractService.java)
+- [`ContractGuiService`](../src/main/java/com/g2806/soulsteal/contract/ContractGuiService.java)
+- [`ContractCatalog`](../src/main/java/com/g2806/soulsteal/contract/ContractCatalog.java)
+- [`ContractDefinition`](../src/main/java/com/g2806/soulsteal/contract/ContractDefinition.java)
+
+### Shop
+
+The shop is a chest-based GUI rendered entirely with vanilla screen handler APIs.
+
+Behavior:
+
+- The home view lists categories with pagination.
+- Category views list entries with pagination.
+- Item entries can be direct purchases or quantity-select purchases.
+- Purchases can be repeatable or single-unlock.
+- Cooldowns can be stored per entry per player.
+- Rewards can include items, effects, commands, and permissions.
+
+Implemented by:
+
+- [`ShopService`](../src/main/java/com/g2806/soulsteal/service/ShopService.java)
+- [`RewardService`](../src/main/java/com/g2806/soulsteal/service/RewardService.java)
+- [`SoulShopScreenHandler`](../src/main/java/com/g2806/soulsteal/shop/SoulShopScreenHandler.java)
+- [`ShopCatalog`](../src/main/java/com/g2806/soulsteal/shop/ShopCatalog.java)
+
+### HUD
+
+The HUD layer is optional and configurable per player.
+
+Behavior:
+
+- Scoreboard sidebar can be enabled globally and toggled per player.
+- The sidebar title uses the same dark aqua styling as the mod's chat prefix.
+- Contract and bounty rows only appear while the player has an active selected contract or active bounties.
+- Balance, contract, and bounty rows use color to make the sidebar easier to scan.
+- Leaderboard pages are built from stored player names and balance values.
+- Wanted-player bossbars show bounty value and remaining time.
+
+Implemented by:
+
+- [`HudService`](../src/main/java/com/g2806/soulsteal/service/HudService.java)
+
+### Permissions
+
+The mod checks permissions in two layers:
+
+1. External permission backends through the Fabric permissions API and optional LuckPerms integration.
+2. Internal fallback storage persisted in `soulsteal-data.json`.
+
+This allows reward-granted permissions and admin nodes to keep working even without an external permission mod.
+
+Implemented by:
+
+- [`PermissionService`](../src/main/java/com/g2806/soulsteal/service/PermissionService.java)
+
+## Command Reference
+
+The root command has two aliases:
+
+- `/souls`
+- `/soul`
+
+### Player Commands
+
+- `/souls`
+  - Shows your current balance.
+- `/souls balance`
+  - Same as `/souls`.
+- `/souls balance <player>`
+  - Shows another player’s balance.
+- `/souls pay <player> <amount>`
+  - Transfers souls to another player.
+- `/souls shop [category]`
+  - Opens the shop GUI.
+- `/souls bounty place <player> <amount> [durationSeconds]`
+  - Places a bounty.
+- `/souls bounty list [player]`
+  - Lists active bounties.
+- `/souls scoreboard`
+  - Shows scoreboard visibility state.
+- `/souls scoreboard toggle`
+  - Toggles the player’s scoreboard preference.
+- `/souls scoreboard on`
+  - Forces scoreboard visibility on.
+- `/souls scoreboard off`
+  - Forces scoreboard visibility off.
+- `/souls top [page]`
+  - Shows leaderboard pages.
+- `/souls tracker give <player> <target>`
+  - Gives a tracker compass to one player that points at another player.
+- `/souls contracts`
+  - Opens the contract browser GUI.
+- `/souls contracts selected`
+  - Shows the currently selected contract and progress.
+- `/souls contracts clear`
+  - Clears your selected contract.
+
+### Admin Commands
+
+- `/souls reload`
+  - Reloads config and shop definitions.
+- `/souls set <player> <amount>`
+  - Sets a balance directly.
+- `/souls add <player> <amount>`
+  - Adds souls to a balance.
+- `/souls take <player> <amount>`
+  - Removes souls from a balance.
+
+Permission defaults and node names are configured in `config.yml`.
+
+## Configuration Files
+
+### `config/soulsteal/config.yml`
+
+Primary configuration file. It controls:
+
+- Economy values
+- Death penalties
+- Transfer rules
+- Bounty limits and payouts
+- Tracker compass behavior
+- Shop UI defaults
+- HUD toggles and titles
+- Permission node names
+
+The schema is defined in [`SoulStealConfig`](../src/main/java/com/g2806/soulsteal/config/SoulStealConfig.java).
+
+### `config/soulsteal/shop.yml`
+
+Shop catalog definition. It controls:
+
+- Shop title and layout
+- Category list
+- Entry pricing
+- Entry cooldowns
+- Reward definitions
+- Optional custom quantity selector behavior
+
+The catalog is loaded through [`ConfigBundle`](../src/main/java/com/g2806/soulsteal/config/ConfigBundle.java).
+
+### `config/soulsteal/catalog.yml`
+
+Contract catalog definition. It controls:
+
+- Grouped contract lists under `mining` and `hunting`
+- Internal contract ids from each entry `id`
+- Player-facing contract names
+- Icon item ids
+- Target block or mob ids
+- Required amounts and rewards
+- Repeatable behavior
+
+The catalog is loaded through [`ConfigBundle`](../src/main/java/com/g2806/soulsteal/config/ConfigBundle.java).
+
+### `config/soulsteal/soulsteal-data.json`
+
+Persistent runtime data. It stores:
+
+- Player soul balances
+- Active bounties
+- Bounty placement cooldowns
+- Shop unlocks
+- Shop purchase cooldowns
+- Permission fallback grants
+- Player name history
+- Scoreboard visibility preferences
+- Selected contracts
+- Contract progress
+
+Loaded and saved by [`SoulStealDataStore`](../src/main/java/com/g2806/soulsteal/data/SoulStealDataStore.java).
+
+## Data Flow
+
+### Player Join
+
+When a player joins:
+
+1. Their name is recorded in persistent data.
+2. Their HUD state is refreshed.
+3. Any configured scoreboard or bossbar state is pushed to them.
+
+### HUD Sidebar
+
+When the sidebar is visible:
+
+1. The title is rendered in dark aqua.
+2. The soul balance row is always shown.
+3. Contract rows are only shown if the player has an active selected contract.
+4. Bounty rows are only shown if the player currently has active bounties.
+5. The visible rows use color to distinguish balance, contract, and bounty information.
+
+### Player Kill
+
+When one player kills another player:
+
+1. The killer receives kill reward souls if enabled.
+2. Any matching bounties on the victim are claimed.
+3. The killer receives a tracker compass if the tracker feature is enabled.
+4. Any matching hunting contract progresses if the killer has one selected.
+
+### Block Break
+
+When a player breaks a block:
+
+1. Any matching mining contract progresses if the player has one selected.
+
+### Player Death
+
+When a player dies:
+
+1. The configured death penalty is applied.
+2. If the death was not caused by another player, unclaimed bounties on the victim can be cleared.
+
+### Server Tick
+
+On server tick:
+
+1. Tracker compasses are updated and expired compasses are removed.
+2. Bounty expirations are processed once per second.
+3. HUD elements are refreshed.
+
+### Server Shutdown
+
+On shutdown:
+
+- Persistent data is saved to disk.
+
+## Project Structure
+
+- `src/main/java/com/g2806/soulsteal/`
+  - Bootstrap, commands, services, config, data, shop, and utilities.
+- `src/main/java/com/g2806/soulsteal/contract/`
+  - Contract catalog, GUI, and screen handling classes.
+- `src/main/resources/`
+  - Fabric metadata and resource files.
+- `build.gradle`
+  - Fabric Loom build configuration.
+
+## Development Notes
+
+- The mod targets Java 21.
+- It is structured as a server-only feature set, so most behavior is driven by server lifecycle events.
+- Persistence is intentionally simple: one JSON data file and YAML-driven configuration.
+- External integrations are reflected through reflection-based checks so the mod can run without hard dependencies on permission backends.
+- Contract configuration is separated into `catalog.yml` so contract entries can be expanded without changing the main economy config.

gradle.properties

@@ -10,7 +10,7 @@ loom_version=1.16.1
 fabric_api_version=0.141.3+1.21.11
 
 # Mod Properties
-mod_version=0.3.0
+mod_version=0.4.0
 maven_group=com.g2806.soulsteal
 archives_base_name=soul-steal
 

src/main/java/com/g2806/soulsteal/SoulStealMod.java

@@ -5,6 +5,8 @@ import com.g2806.soulsteal.config.ConfigBundle;
 import com.g2806.soulsteal.config.SoulStealConfig;
 import com.g2806.soulsteal.data.SoulStealDataStore;
 import com.g2806.soulsteal.service.BountyService;
+import com.g2806.soulsteal.service.ContractService;
+import com.g2806.soulsteal.contract.ContractGuiService;
 import com.g2806.soulsteal.service.HudService;
 import com.g2806.soulsteal.service.PermissionService;
 import com.g2806.soulsteal.service.RewardService;
@@ -21,9 +23,11 @@ import net.fabricmc.fabric.api.entity.event.v1.ServerEntityCombatEvents;
 import net.fabricmc.fabric.api.entity.event.v1.ServerLivingEntityEvents;
 import net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents;
 import net.fabricmc.fabric.api.event.lifecycle.v1.ServerTickEvents;
+import net.fabricmc.fabric.api.event.player.PlayerBlockBreakEvents;
 import net.fabricmc.fabric.api.networking.v1.ServerPlayConnectionEvents;
 import net.fabricmc.loader.api.FabricLoader;
 import net.minecraft.entity.damage.DamageSource;
+import net.minecraft.registry.Registries;
 import net.minecraft.server.MinecraftServer;
 import net.minecraft.server.network.ServerPlayerEntity;
 import net.minecraft.text.Text;
@@ -46,11 +50,17 @@ public final class SoulStealMod implements ModInitializer {
     private SoulService soulService;
     private PermissionService permissionService;
     private BountyService bountyService;
+    private ContractService contractService;
+    private ContractGuiService contractGuiService;
     private RewardService rewardService;
     private TrackerCompassService trackerCompassService;
     private ShopService shopService;
     private HudService hudService;
 
+    /**
+     * Initializes the mod, loads configuration and persistent state, and registers all runtime
+     * event handlers.
+     */
     @Override
     public void onInitialize() {
         LOGGER.info("Initializing Soul Steal");
@@ -67,10 +77,12 @@ public final class SoulStealMod implements ModInitializer {
         permissionService = new PermissionService(dataStore);
         soulService = new SoulService(this::config, dataStore);
         bountyService = new BountyService(this::config, dataStore, soulService);
+        contractService = new ContractService(() -> this.bundle().contractCatalog(), dataStore, soulService);
         rewardService = new RewardService(permissionService, soulService);
+        contractGuiService = new ContractGuiService(this::bundle, contractService, rewardService, soulService);
         trackerCompassService = new TrackerCompassService(this::config);
         shopService = new ShopService(this::bundle, soulService, rewardService, dataStore);
-        hudService = new HudService(this::config, dataStore, soulService, bountyService);
+        hudService = new HudService(this::config, dataStore, soulService, bountyService, contractService);
 
         CommandRegistrationCallback.EVENT.register((dispatcher, buildContext, selection) -> SoulCommandRegistrar.register(dispatcher, this));
         ServerPlayConnectionEvents.JOIN.register((handler, sender, server) -> hudService.handlePlayerJoin(handler.player));
@@ -83,6 +95,16 @@ public final class SoulStealMod implements ModInitializer {
         ServerLivingEntityEvents.AFTER_DEATH.register((entity, damageSource) -> {
             if (entity instanceof ServerPlayerEntity player) {
                 onPlayerDeath(player, damageSource);
+                return;
+            }
+
+            if (damageSource.getAttacker() instanceof ServerPlayerEntity killer) {
+                contractService.recordHunting(killer, Registries.ENTITY_TYPE.getId(entity.getType()).toString());
+            }
+        });
+        PlayerBlockBreakEvents.AFTER.register((world, player, pos, state, blockEntity) -> {
+            if (player instanceof ServerPlayerEntity serverPlayer) {
+                contractService.recordMining(serverPlayer, Registries.BLOCK.getId(state.getBlock()).toString());
             }
         });
         ServerTickEvents.END_SERVER_TICK.register(this::onServerTick);
@@ -101,7 +123,6 @@ public final class SoulStealMod implements ModInitializer {
             MinecraftServer server = killer.getCommandSource().getServer();
             server.getPlayerManager().broadcast(SoulTexts.info(killer.getName().getString() + " claimed " + bountyClaim.reward() + " bounty souls from " + victim.getName().getString() + "."), false);
         }
-
         trackerCompassService.giveTrackerCompass(killer, victim);
     }
 
@@ -140,6 +161,12 @@ public final class SoulStealMod implements ModInitializer {
         hudService.tick(server, now);
     }
 
+    /**
+     * Reloads the YAML configuration bundle from disk.
+     *
+     * @return {@code true} if the reload succeeded; {@code false} if the config file could not be
+     *         loaded
+     */
     public boolean reloadConfiguration() {
         try {
             configBundle = ConfigBundle.load(configDirectory);
@@ -158,38 +185,91 @@ public final class SoulStealMod implements ModInitializer {
         }
     }
 
+    /**
+     * Returns the loaded configuration bundle.
+     *
+     * @return the current configuration bundle
+     */
     public ConfigBundle bundle() {
         return configBundle;
     }
 
+    /**
+     * Returns the active mod configuration.
+     *
+     * @return the current configuration tree
+     */
     public SoulStealConfig config() {
         return configBundle.config();
     }
 
+    /**
+     * Returns the service responsible for balance changes.
+     *
+     * @return the soul service
+     */
     public SoulService soulService() {
         return soulService;
     }
 
+    /**
+     * Returns the permission service.
+     *
+     * @return the permission service
+     */
     public PermissionService permissionService() {
         return permissionService;
     }
 
+    /**
+     * Returns the bounty service.
+     *
+     * @return the bounty service
+     */
     public BountyService bountyService() {
         return bountyService;
     }
 
+    public ContractService contractService() {
+        return contractService;
+    }
+
+    public ContractGuiService contractGuiService() {
+        return contractGuiService;
+    }
+
+    /**
+     * Returns the reward service.
+     *
+     * @return the reward service
+     */
     public RewardService rewardService() {
         return rewardService;
     }
 
+    /**
+     * Returns the tracker compass service.
+     *
+     * @return the tracker compass service
+     */
     public TrackerCompassService trackerCompassService() {
         return trackerCompassService;
     }
 
+    /**
+     * Returns the shop service.
+     *
+     * @return the shop service
+     */
     public ShopService shopService() {
         return shopService;
     }
 
+    /**
+     * Returns the HUD service.
+     *
+     * @return the HUD service
+     */
     public HudService hudService() {
         return hudService;
     }

src/main/java/com/g2806/soulsteal/command/SoulCommandRegistrar.java

@@ -1,6 +1,7 @@
 package com.g2806.soulsteal.command;
 
 import com.g2806.soulsteal.SoulStealMod;
+import com.g2806.soulsteal.contract.ContractDefinition;
 import com.g2806.soulsteal.data.StoredBounty;
 import com.g2806.soulsteal.service.BountyService;
 import com.g2806.soulsteal.service.HudService;
@@ -25,36 +26,57 @@ public final class SoulCommandRegistrar {
     private SoulCommandRegistrar() {
     }
 
+    /**
+     * Registers the public command roots exposed by the mod.
+     *
+     * @param dispatcher Brigadier dispatcher used by Fabric to install commands
+     * @param mod active mod instance used to resolve services and configuration
+     */
     public static void register(CommandDispatcher<ServerCommandSource> dispatcher, SoulStealMod mod) {
+        // Register both command roots so players can use either the full name or the short alias.
         dispatcher.register(buildRoot("souls", mod));
         dispatcher.register(buildRoot("soul", mod));
     }
 
+    /**
+     * Builds one of the root command aliases and all nested subcommands.
+     *
+     * @param rootName literal command root to register, such as {@code souls} or {@code soul}
+     * @param mod active mod instance used to resolve services and permissions
+     * @return a fully populated command tree for the requested root
+     */
     private static com.mojang.brigadier.builder.LiteralArgumentBuilder<ServerCommandSource> buildRoot(String rootName, SoulStealMod mod) {
         return literal(rootName)
+                // Running the root command alone shows the player's own balance.
                 .executes(context -> showOwnBalance(context, mod))
+                // /soul balance
                 .then(literal("balance")
                         .executes(context -> showOwnBalance(context, mod))
                         .then(argument("player", EntityArgumentType.player())
-                        .requires(source -> mod.permissionService().hasAny(source, 2,
-                            mod.config().permissions().adminNode(),
-                            mod.config().permissions().balanceOthersNode()))
+                                // Only privileged sources can inspect another player's balance.
+                                .requires(source -> mod.permissionService().hasAny(source, 2,
+                                        mod.config().permissions().adminNode(),
+                                        mod.config().permissions().balanceOthersNode()))
                                 .executes(context -> showTargetBalance(context, mod))))
+                // /soul pay <player> <amount>
                 .then(literal("pay")
                         .requires(source -> mod.permissionService().has(source, mod.config().permissions().shopNode(), 0))
                         .then(argument("player", EntityArgumentType.player())
                                 .then(argument("amount", LongArgumentType.longArg(1L))
                                         .executes(context -> transferSouls(context, mod)))))
+                // /soul shop [category]
                 .then(literal("shop")
                         .requires(source -> mod.permissionService().has(source, mod.config().permissions().shopNode(), 0))
                         .executes(context -> openShop(context, mod, null))
                         .then(argument("category", StringArgumentType.word())
                                 .executes(context -> openShop(context, mod, StringArgumentType.getString(context, "category")))))
+                // /soul bounty ...
                 .then(literal("bounty")
                         .requires(source -> mod.permissionService().has(source, mod.config().permissions().bountyNode(), 0))
                         .then(literal("place")
                                 .then(argument("player", EntityArgumentType.player())
                                         .then(argument("amount", LongArgumentType.longArg(1L))
+                                                // Default duration comes from config unless the caller provides one explicitly.
                                                 .executes(context -> placeBounty(context, mod, mod.config().bounty().defaultDurationSeconds()))
                                                 .then(argument("durationSeconds", LongArgumentType.longArg(1L))
                                                         .executes(context -> placeBounty(context, mod, LongArgumentType.getLong(context, "durationSeconds")))))))
@@ -62,25 +84,45 @@ public final class SoulCommandRegistrar {
                                 .executes(context -> listBounties(context, mod, null))
                                 .then(argument("player", EntityArgumentType.player())
                                         .executes(context -> listBounties(context, mod, EntityArgumentType.getPlayer(context, "player"))))))
-                    .then(literal("scoreboard")
+                // /soul scoreboard ...
+                .then(literal("scoreboard")
                         .requires(source -> mod.permissionService().hasAny(source, 0, mod.config().permissions().scoreboardNode()))
                         .executes(context -> showScoreboardStatus(context, mod))
+                        // Toggle uses the player's stored preference.
                         .then(literal("toggle")
-                            .executes(context -> toggleScoreboard(context, mod)))
+                                .executes(context -> toggleScoreboard(context, mod)))
+                        // Explicit on/off commands are useful for scripts and exact control.
                         .then(literal("on")
-                            .executes(context -> setScoreboardVisibility(context, mod, true)))
+                                .executes(context -> setScoreboardVisibility(context, mod, true)))
                         .then(literal("off")
-                            .executes(context -> setScoreboardVisibility(context, mod, false))))
-                    .then(literal("top")
+                                .executes(context -> setScoreboardVisibility(context, mod, false))))
+                // /soul top [page]
+                .then(literal("top")
                         .requires(source -> mod.permissionService().hasAny(source, 0, mod.config().permissions().leaderboardNode()))
                         .executes(context -> showLeaderboard(context, mod, 1))
                         .then(argument("page", IntegerArgumentType.integer(1))
-                            .executes(context -> showLeaderboard(context, mod, IntegerArgumentType.getInteger(context, "page")))))
+                                .executes(context -> showLeaderboard(context, mod, IntegerArgumentType.getInteger(context, "page")))))
+                // /soul tracker give <player> <target>
+                .then(literal("tracker")
+                        .requires(source -> mod.permissionService().hasAny(source, 2, mod.config().permissions().adminNode()))
+                        .then(literal("give")
+                                .then(argument("player", EntityArgumentType.player())
+                                        .then(argument("target", EntityArgumentType.player())
+                                                .executes(context -> giveTrackerCompass(context, mod))))))
+                // /soul contracts ...
+                .then(literal("contracts")
+                        .executes(context -> openContracts(context, mod))
+                        .then(literal("selected")
+                                .executes(context -> showSelectedContract(context, mod)))
+                        .then(literal("clear")
+                                .executes(context -> clearSelectedContract(context, mod))))
+                // Admin-only maintenance and balance editing commands follow.
                 .then(literal("reload")
                         .requires(source -> mod.permissionService().hasAny(source, 2,
                             mod.config().permissions().adminNode(),
                             mod.config().permissions().reloadNode()))
                         .executes(context -> reload(context, mod)))
+                // Set replaces the target balance outright.
                 .then(literal("set")
                         .requires(source -> mod.permissionService().hasAny(source, 2,
                             mod.config().permissions().adminNode(),
@@ -88,6 +130,7 @@ public final class SoulCommandRegistrar {
                         .then(argument("player", EntityArgumentType.player())
                                 .then(argument("amount", LongArgumentType.longArg(0L))
                                         .executes(context -> setBalance(context, mod)))))
+                // Add and take are bounded changes; they keep the balance moving up or down.
                 .then(literal("add")
                         .requires(source -> mod.permissionService().hasAny(source, 2,
                             mod.config().permissions().adminNode(),
@@ -147,6 +190,7 @@ public final class SoulCommandRegistrar {
         ServerPlayerEntity player = context.getSource().getPlayerOrThrow();
         boolean visible = mod.hudService().isScoreboardVisible(player.getUuid());
         String message = visible ? "Your Soul Steal scoreboard is enabled." : "Your Soul Steal scoreboard is disabled.";
+        // This is a player preference; config can still disable the HUD globally.
         if (!mod.config().hud().scoreboard().enabled()) {
             message += " The server-wide HUD toggle is disabled in config.";
         }
@@ -190,12 +234,56 @@ public final class SoulCommandRegistrar {
         context.getSource().sendFeedback(() -> SoulTexts.info("Soul leaderboard page " + leaderboardPage.page() + "/" + leaderboardPage.totalPages()), false);
         for (int index = 0; index < leaderboardPage.entries().size(); index++) {
             HudService.LeaderboardEntry entry = leaderboardPage.entries().get(index);
+            // Convert the page-local index into the stable 1-based rank shown to players.
             int rank = ((leaderboardPage.page() - 1) * pageSize) + index + 1;
             context.getSource().sendFeedback(() -> Text.literal("#" + rank + " " + entry.playerName() + " - " + entry.souls() + " souls").formatted(net.minecraft.util.Formatting.GRAY), false);
         }
         return 1;
     }
 
+    /**
+     * Gives a tracker compass to one player that points at another player.
+     *
+     * @param context command invocation context
+     * @param mod active mod instance
+     * @return command result code
+     * @throws com.mojang.brigadier.exceptions.CommandSyntaxException if either player argument cannot be resolved
+     */
+    private static int giveTrackerCompass(CommandContext<ServerCommandSource> context, SoulStealMod mod) throws com.mojang.brigadier.exceptions.CommandSyntaxException {
+        ServerPlayerEntity player = EntityArgumentType.getPlayer(context, "player");
+        ServerPlayerEntity target = EntityArgumentType.getPlayer(context, "target");
+
+        mod.trackerCompassService().giveTrackerCompass(player, target);
+        context.getSource().sendFeedback(() -> SoulTexts.success("Gave a tracker compass to " + player.getName().getString() + " for " + target.getName().getString() + "."), true);
+        return 1;
+    }
+
+    private static int openContracts(CommandContext<ServerCommandSource> context, SoulStealMod mod) throws com.mojang.brigadier.exceptions.CommandSyntaxException {
+        ServerPlayerEntity player = context.getSource().getPlayerOrThrow();
+        mod.contractGuiService().openContracts(player);
+        return 1;
+    }
+
+    private static int showSelectedContract(CommandContext<ServerCommandSource> context, SoulStealMod mod) throws com.mojang.brigadier.exceptions.CommandSyntaxException {
+        ServerPlayerEntity player = context.getSource().getPlayerOrThrow();
+        java.util.Optional<ContractDefinition> selected = mod.contractService().selectedContract(player.getUuid());
+        if (selected.isEmpty()) {
+            context.getSource().sendFeedback(() -> SoulTexts.info("You do not have a selected contract."), false);
+            return 1;
+        }
+        ContractDefinition contract = selected.get();
+        long progress = mod.contractService().progress(player.getUuid(), contract.id());
+        context.getSource().sendFeedback(() -> SoulTexts.info("Selected contract: " + contract.name() + " " + progress + "/" + contract.amountRequired() + " souls reward " + contract.reward()), false);
+        return 1;
+    }
+
+    private static int clearSelectedContract(CommandContext<ServerCommandSource> context, SoulStealMod mod) throws com.mojang.brigadier.exceptions.CommandSyntaxException {
+        ServerPlayerEntity player = context.getSource().getPlayerOrThrow();
+        mod.contractService().clearContract(player.getUuid());
+        context.getSource().sendFeedback(() -> SoulTexts.success("Cleared your selected contract."), false);
+        return 1;
+    }
+
     private static int placeBounty(CommandContext<ServerCommandSource> context, SoulStealMod mod, long durationSeconds) throws com.mojang.brigadier.exceptions.CommandSyntaxException {
         ServerPlayerEntity placer = context.getSource().getPlayerOrThrow();
         ServerPlayerEntity target = EntityArgumentType.getPlayer(context, "player");
@@ -230,6 +318,7 @@ public final class SoulCommandRegistrar {
 
         context.getSource().sendFeedback(() -> SoulTexts.info("Active bounties: " + bounties.size()), false);
         for (StoredBounty bounty : bounties) {
+            // Round up so a bounty that expires in a fraction of a second still reports 1 second remaining.
             long remainingSeconds = Math.max(0L, (bounty.expiresAtEpochMillis() - System.currentTimeMillis() + 999L) / 1000L);
             context.getSource().sendFeedback(() -> Text.literal("- " + bounty.targetName() + " | " + bounty.soulValue() + " souls | by " + bounty.placerName() + " | expires in " + DurationFormatter.formatSeconds(remainingSeconds)).formatted(net.minecraft.util.Formatting.GRAY), false);
         }

src/main/java/com/g2806/soulsteal/config/ConfigBundle.java

@@ -1,13 +1,14 @@
 package com.g2806.soulsteal.config;
 
 import com.g2806.soulsteal.shop.ShopCatalog;
+import com.g2806.soulsteal.contract.ContractCatalog;
 import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.Map;
 
 /** Loads and groups the editable YAML files used by the mod. */
-public record ConfigBundle(SoulStealConfig config, ShopCatalog shopCatalog) {
+public record ConfigBundle(SoulStealConfig config, ShopCatalog shopCatalog, ContractCatalog contractCatalog) {
     public static ConfigBundle load(Path configDirectory) throws IOException {
         Files.createDirectories(configDirectory);
 
@@ -17,6 +18,9 @@ public record ConfigBundle(SoulStealConfig config, ShopCatalog shopCatalog) {
         Map<String, Object> shopMap = YamlConfigHelper.loadOrCreate(configDirectory.resolve("shop.yml"), ShopCatalog.defaultYaml());
         ShopCatalog shopCatalog = ShopCatalog.fromMap(shopMap, config.shop());
 
-        return new ConfigBundle(config, shopCatalog);
+        Map<String, Object> contractMap = YamlConfigHelper.loadOrCreate(configDirectory.resolve("catalog.yml"), ContractCatalog.defaultYaml());
+        ContractCatalog contractCatalog = ContractCatalog.fromMap(contractMap, config.contracts());
+
+        return new ConfigBundle(config, shopCatalog, contractCatalog);
     }
 }

src/main/java/com/g2806/soulsteal/config/SoulStealConfig.java

@@ -9,6 +9,7 @@ public record SoulStealConfig(
         EconomyConfig economy,
         BountyConfig bounty,
         TrackerConfig tracker,
+        ContractConfig contracts,
         ShopUiConfig shop,
         HudConfig hud,
         PermissionConfig permissions
@@ -19,6 +20,7 @@ public record SoulStealConfig(
         Map<String, Object> transferSection = YamlConfigHelper.section(economySection, "transfer");
         Map<String, Object> bountySection = YamlConfigHelper.section(root, "bounties");
         Map<String, Object> trackerSection = YamlConfigHelper.section(root, "tracker");
+        Map<String, Object> contractsSection = YamlConfigHelper.section(root, "contracts");
         Map<String, Object> shopSection = YamlConfigHelper.section(root, "shop");
         Map<String, Object> hudSection = YamlConfigHelper.section(root, "hud");
         Map<String, Object> scoreboardSection = YamlConfigHelper.section(hudSection, "scoreboard");
@@ -69,6 +71,15 @@ public record SoulStealConfig(
                 YamlConfigHelper.bool(trackerSection, "expire_if_target_offline", false)
         );
 
+        ContractConfig contractConfig = new ContractConfig(
+                YamlConfigHelper.bool(contractsSection, "enabled", true),
+                YamlConfigHelper.bool(contractsSection, "auto_claim", true),
+                new ContractHudConfig(
+                        YamlConfigHelper.bool(contractsSection, "hud_enabled", true),
+                        YamlConfigHelper.string(contractsSection, "hud_title", "Active Contract")
+                )
+        );
+
         ShopUiConfig shopUiConfig = new ShopUiConfig(
                 YamlConfigHelper.string(shopSection, "title", "Soul Shop"),
                 clampRows(YamlConfigHelper.intValue(shopSection, "rows", 3)),
@@ -106,7 +117,7 @@ public record SoulStealConfig(
                 YamlConfigHelper.string(permissionsSection, "leaderboard_node", "soulsteal.leaderboard")
         );
 
-        return new SoulStealConfig(economyConfig, bountyConfig, trackerConfig, shopUiConfig, hudConfig, permissionConfig);
+        return new SoulStealConfig(economyConfig, bountyConfig, trackerConfig, contractConfig, shopUiConfig, hudConfig, permissionConfig);
     }
 
     public static String defaultYaml() {
@@ -142,6 +153,12 @@ public record SoulStealConfig(
                   update_interval_ticks: 20
                   expire_if_target_offline: false
 
+                contracts:
+                  enabled: true
+                  auto_claim: true
+                  hud_enabled: true
+                  hud_title: "Active Contract"
+
                 shop:
                   title: "Soul Shop"
                   rows: 3
@@ -219,6 +236,12 @@ public record SoulStealConfig(
     public record TrackerConfig(boolean enabled, long durationSeconds, int updateIntervalTicks, boolean expireIfTargetOffline) {
     }
 
+    public record ContractConfig(boolean enabled, boolean autoClaim, ContractHudConfig hud) {
+    }
+
+    public record ContractHudConfig(boolean enabled, String title) {
+    }
+
     public record ShopUiConfig(
             String title,
             int rows,

src/main/java/com/g2806/soulsteal/contract/ContractCatalog.java

@@ -0,0 +1,113 @@
+package com.g2806.soulsteal.contract;
+
+import com.g2806.soulsteal.config.SoulStealConfig.ContractConfig;
+import com.g2806.soulsteal.config.YamlConfigHelper;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+
+/**
+ * Parsed contract catalog loaded from `catalog.yml`.
+ *
+ * <p>Contracts are grouped by type in the GUI, but remain flat in the config so each entry can be
+ * addressed by its own id.</p>
+ */
+public record ContractCatalog(boolean enabled, boolean autoClaim, boolean hudEnabled, String hudTitle, List<ContractDefinition> contracts) {
+    public static ContractCatalog fromMap(Map<String, Object> root, ContractConfig config) {
+        List<ContractDefinition> contracts = new ArrayList<>();
+        Object rawContracts = root.get("contracts");
+        if (rawContracts instanceof List<?> rawList) {
+            for (Object rawContract : rawList) {
+                addContract(contracts, rawContract);
+            }
+        } else if (rawContracts instanceof Map<?, ?> rawSections) {
+            for (Map.Entry<?, ?> sectionEntry : rawSections.entrySet()) {
+                if (sectionEntry.getValue() instanceof List<?> rawList) {
+                    for (Object rawContract : rawList) {
+                        addContract(contracts, rawContract);
+                    }
+                }
+            }
+        }
+        return new ContractCatalog(config.enabled(), config.autoClaim(), config.hud().enabled(), config.hud().title(), contracts);
+    }
+
+    public Optional<ContractDefinition> contract(String id) {
+        return contracts.stream().filter(contract -> contract.id().equalsIgnoreCase(id)).findFirst();
+    }
+
+    public List<ContractDefinition> contractsOfType(ContractType type) {
+        return contracts.stream().filter(contract -> contract.type() == type).toList();
+    }
+
+    public static String defaultYaml() {
+        return """
+                contracts:
+                  mining:
+                    - id: "iron_miner"
+                      name: "Mining Contracts"
+                      icon: "minecraft:iron_pickaxe"
+                      type: "mining"
+                      target: "minecraft:iron_ore"
+                      target_name: "Iron Ore"
+                      description: "Mine iron ore to earn souls."
+                      amount: 64
+                      reward: 250
+                      repeatable: true
+                  hunting:
+                    - id: "zombie_hunter"
+                      name: "Zombie Hunter"
+                      icon: "minecraft:zombie_head"
+                      type: "hunting"
+                      target: "minecraft:zombie"
+                      target_name: "Zombie"
+                      description: "Hunt zombies to earn souls."
+                      amount: 20
+                      reward: 200
+                      repeatable: true
+                """;
+    }
+
+    private static Map<String, Object> toStringMap(Map<?, ?> rawMap) {
+        Map<String, Object> converted = new java.util.LinkedHashMap<>();
+        for (Map.Entry<?, ?> entry : rawMap.entrySet()) {
+            if (entry.getKey() != null) {
+                converted.put(String.valueOf(entry.getKey()), entry.getValue());
+            }
+        }
+        return converted;
+    }
+
+    private static void addContract(List<ContractDefinition> contracts, Object rawContract) {
+        if (!(rawContract instanceof Map<?, ?> rawMap)) {
+            return;
+        }
+        Map<String, Object> map = toStringMap(rawMap);
+        String id = YamlConfigHelper.string(map, "id", "").trim();
+        if (id.isBlank()) {
+            return;
+        }
+
+        String typeName = YamlConfigHelper.string(map, "type", "mining").trim().toUpperCase();
+        ContractType type;
+        try {
+            type = ContractType.valueOf(typeName);
+        } catch (IllegalArgumentException ignored) {
+            return;
+        }
+
+        contracts.add(new ContractDefinition(
+                id,
+                YamlConfigHelper.string(map, "name", id),
+                YamlConfigHelper.string(map, "icon", type == ContractType.MINING ? "minecraft:iron_pickaxe" : "minecraft:zombie_head"),
+                type,
+                YamlConfigHelper.string(map, "target", ""),
+                YamlConfigHelper.string(map, "target_name", YamlConfigHelper.string(map, "target", id)),
+                YamlConfigHelper.string(map, "description", ""),
+                Math.max(1L, YamlConfigHelper.longValue(map, "amount", 1L)),
+                Math.max(0L, YamlConfigHelper.longValue(map, "reward", 0L)),
+                YamlConfigHelper.bool(map, "repeatable", true)
+        ));
+    }
+}

src/main/java/com/g2806/soulsteal/contract/ContractDefinition.java

@@ -0,0 +1,21 @@
+package com.g2806.soulsteal.contract;
+
+/**
+ * Immutable definition for one contract entry loaded from `catalog.yml`.
+ *
+ * <p>The YAML key is the internal id used for selection and persistence, while {@code name} is
+ * the player-facing label shown in the GUI and HUD.</p>
+ */
+public record ContractDefinition(
+        String id,
+        String name,
+        String iconItemId,
+        ContractType type,
+        String targetId,
+        String targetName,
+        String description,
+        long amountRequired,
+        long reward,
+        boolean repeatable
+) {
+}

src/main/java/com/g2806/soulsteal/contract/ContractGuiService.java

@@ -0,0 +1,297 @@
+package com.g2806.soulsteal.contract;
+
+import com.g2806.soulsteal.config.ConfigBundle;
+import com.g2806.soulsteal.service.ContractService;
+import com.g2806.soulsteal.service.RewardService;
+import com.g2806.soulsteal.service.SoulService;
+import com.g2806.soulsteal.util.DurationFormatter;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.function.Supplier;
+import net.minecraft.component.DataComponentTypes;
+import net.minecraft.component.type.LoreComponent;
+import net.minecraft.inventory.SimpleInventory;
+import net.minecraft.item.ItemStack;
+import net.minecraft.server.network.ServerPlayerEntity;
+import net.minecraft.text.Text;
+import net.minecraft.util.Formatting;
+
+/**
+ * Builds the server-side contract browser and dispatches click handling for contract selection.
+ *
+ * <p>The contract UI follows the same chest-based presentation style as the shop GUI so players
+ * can scan categories, read contract details, and select an active objective without client-side
+ * mods.</p>
+ */
+public final class ContractGuiService {
+    private static final int PAGE_ROWS = 6;
+    private static final int ITEM_SLOT_COUNT = 45;
+    private static final int SLOT_HOME = 45;
+    private static final int SLOT_PREVIOUS = 46;
+    private static final int SLOT_INFO = 49;
+    private static final int SLOT_CLEAR = 52;
+    private static final int SLOT_NEXT = 53;
+    private final Supplier<ConfigBundle> bundleSupplier;
+    private final ContractService contractService;
+    private final RewardService rewardService;
+    private final SoulService soulService;
+
+    public ContractGuiService(Supplier<ConfigBundle> bundleSupplier, ContractService contractService, RewardService rewardService, SoulService soulService) {
+        this.bundleSupplier = bundleSupplier;
+        this.contractService = contractService;
+        this.rewardService = rewardService;
+        this.soulService = soulService;
+    }
+
+    public void openContracts(ServerPlayerEntity player) {
+        openHome(player, 0);
+    }
+
+    public void openHome(ServerPlayerEntity player, int page) {
+        player.openHandledScreen(new net.minecraft.screen.SimpleNamedScreenHandlerFactory(
+                (syncId, inventory, ignored) -> new ContractScreenHandler(syncId, inventory, this, new HomeView(page)),
+                Text.literal(bundleSupplier.get().contractCatalog().hudTitle())
+        ));
+    }
+
+    public void openCategory(ServerPlayerEntity player, String categoryKey, int page) {
+        player.openHandledScreen(new net.minecraft.screen.SimpleNamedScreenHandlerFactory(
+                (syncId, inventory, ignored) -> new ContractScreenHandler(syncId, inventory, this, new CategoryView(categoryKey, page)),
+                Text.literal(bundleSupplier.get().contractCatalog().hudTitle())
+        ));
+    }
+
+    public SimpleInventory createInventory(ServerPlayerEntity player, View view) {
+        return switch (view) {
+            case HomeView homeView -> createHomeInventory(player, homeView);
+            case CategoryView categoryView -> createCategoryInventory(player, categoryView);
+        };
+    }
+
+    public void handleClick(ServerPlayerEntity player, View view, int slotIndex) {
+        if (view instanceof HomeView homeView) {
+            handleHomeClick(player, homeView, slotIndex);
+        } else if (view instanceof CategoryView categoryView) {
+            handleCategoryClick(player, categoryView, slotIndex);
+        }
+    }
+
+    public ContractDefinition selected(ServerPlayerEntity player) {
+        return contractService.selectedContract(player.getUuid()).orElse(null);
+    }
+
+    public long progress(ServerPlayerEntity player) {
+        ContractDefinition selected = selected(player);
+        return selected == null ? 0L : contractService.progress(player.getUuid(), selected.id());
+    }
+
+    public long progress(ServerPlayerEntity player, ContractDefinition contract) {
+        return contractService.progress(player.getUuid(), contract.id());
+    }
+
+    public boolean select(ServerPlayerEntity player, ContractDefinition contract) {
+        return contractService.selectContract(player, contract.id());
+    }
+
+    public void clearSelection(ServerPlayerEntity player) {
+        contractService.clearContract(player.getUuid());
+    }
+
+    private SimpleInventory createHomeInventory(ServerPlayerEntity player, HomeView view) {
+        SimpleInventory inventory = filledInventory(PAGE_ROWS);
+        List<ContractDefinition> mining = bundleSupplier.get().contractCatalog().contractsOfType(ContractType.MINING);
+        List<ContractDefinition> hunting = bundleSupplier.get().contractCatalog().contractsOfType(ContractType.HUNTING);
+
+        inventory.setStack(0, createCategoryButton("Mining Contracts", "minecraft:iron_pickaxe", mining.size(), "Browse mining contracts"));
+        inventory.setStack(1, createCategoryButton("Hunting Contracts", "minecraft:zombie_head", hunting.size(), "Browse mob hunting contracts"));
+        inventory.setStack(SLOT_INFO, createHomeInfoButton(player));
+        inventory.setStack(SLOT_CLEAR, createClearButton(player));
+        return inventory;
+    }
+
+    private SimpleInventory createCategoryInventory(ServerPlayerEntity player, CategoryView view) {
+        SimpleInventory inventory = filledInventory(PAGE_ROWS);
+        List<ContractDefinition> contracts = pagedContracts(contractsFor(player, view.categoryKey()), view.page());
+
+        for (int index = 0; index < contracts.size() && index < ITEM_SLOT_COUNT; index++) {
+            inventory.setStack(index, createContractStack(player, contracts.get(index)));
+        }
+
+        inventory.setStack(SLOT_HOME, createBackButton());
+        inventory.setStack(SLOT_PREVIOUS, createPageButton(view.page(), totalPages(player, view.categoryKey()), true));
+        inventory.setStack(SLOT_INFO, createCategoryInfoButton(player, view.categoryKey()));
+        inventory.setStack(SLOT_CLEAR, createClearButton(player));
+        inventory.setStack(SLOT_NEXT, createPageButton(view.page(), totalPages(player, view.categoryKey()), false));
+        return inventory;
+    }
+
+    private void handleHomeClick(ServerPlayerEntity player, HomeView view, int slotIndex) {
+        if (slotIndex == 0) {
+            openCategory(player, "mining", 0);
+        } else if (slotIndex == 1) {
+            openCategory(player, "hunting", 0);
+        } else if (slotIndex == SLOT_CLEAR) {
+            clearSelection(player);
+            player.sendMessage(net.minecraft.text.Text.literal("Cleared selected contract.").formatted(Formatting.GREEN), false);
+            openHome(player, view.page());
+        }
+    }
+
+    private void handleCategoryClick(ServerPlayerEntity player, CategoryView view, int slotIndex) {
+        if (slotIndex < ITEM_SLOT_COUNT) {
+            List<ContractDefinition> contracts = pagedContracts(contractsFor(player, view.categoryKey()), view.page());
+            if (slotIndex >= contracts.size()) {
+                return;
+            }
+            ContractDefinition contract = contracts.get(slotIndex);
+            if (select(player, contract)) {
+                player.sendMessage(net.minecraft.text.Text.literal("Selected contract: " + contract.name()).formatted(Formatting.GREEN), false);
+            }
+            openCategory(player, view.categoryKey(), view.page());
+            return;
+        }
+
+        if (slotIndex == SLOT_HOME) {
+            openContracts(player);
+        } else if (slotIndex == SLOT_PREVIOUS) {
+            openCategory(player, view.categoryKey(), Math.max(0, view.page() - 1));
+        } else if (slotIndex == SLOT_NEXT) {
+            openCategory(player, view.categoryKey(), Math.min(totalPages(player, view.categoryKey()) - 1, view.page() + 1));
+        } else if (slotIndex == SLOT_CLEAR) {
+            clearSelection(player);
+            player.sendMessage(net.minecraft.text.Text.literal("Cleared selected contract.").formatted(Formatting.GREEN), false);
+            openCategory(player, view.categoryKey(), view.page());
+        }
+    }
+
+    private ItemStack createContractStack(ServerPlayerEntity player, ContractDefinition contract) {
+        long progress = progress(player, contract);
+        List<Text> lore = new ArrayList<>();
+        if (!contract.description().isBlank()) {
+            lore.add(Text.literal(contract.description()).formatted(Formatting.GRAY));
+        }
+        lore.add(Text.literal("Target: " + contract.targetName()).formatted(Formatting.AQUA));
+        lore.add(Text.literal("Progress: " + progress + "/" + contract.amountRequired()).formatted(Formatting.GOLD));
+        lore.add(Text.literal("Reward: " + contract.reward() + " souls").formatted(Formatting.GREEN));
+        lore.add(Text.literal(contract.repeatable() ? "Repeatable" : "One-time").formatted(Formatting.DARK_GRAY));
+
+        ContractDefinition selected = selected(player);
+        if (selected != null && selected.id().equalsIgnoreCase(contract.id())) {
+            lore.add(Text.literal("Selected").formatted(Formatting.AQUA));
+        }
+
+        return createPreviewStack(contract.iconItemId(), contract.name(), lore);
+    }
+
+    private ItemStack createCategoryButton(String name, String iconItemId, int count, String description) {
+        return createPreviewStack(iconItemId, name, List.of(
+                Text.literal(description).formatted(Formatting.GRAY),
+                Text.literal("Contracts: " + count).formatted(Formatting.AQUA)
+        ));
+    }
+
+    private ItemStack createHomeInfoButton(ServerPlayerEntity player) {
+        ContractDefinition selected = selected(player);
+        List<Text> lore = new ArrayList<>();
+        lore.add(Text.literal("Souls: " + soulService.balanceOf(player.getUuid())).formatted(Formatting.GOLD));
+        lore.add(Text.literal("Selected: " + (selected == null ? "None" : selected.name())).formatted(Formatting.AQUA));
+        if (selected != null) {
+            lore.add(Text.literal("Progress: " + progress(player, selected) + "/" + selected.amountRequired()).formatted(Formatting.GRAY));
+        }
+        return createPreviewStack("minecraft:nether_star", "Contract Browser", lore);
+    }
+
+    private ItemStack createCategoryInfoButton(ServerPlayerEntity player, String categoryKey) {
+        List<ContractDefinition> contracts = contractsFor(player, categoryKey);
+        return createPreviewStack("minecraft:nether_star", categoryLabel(categoryKey), List.of(
+                Text.literal("Contracts: " + contracts.size()).formatted(Formatting.AQUA),
+                Text.literal("Selected: " + (selected(player) == null ? "None" : selected(player).name())).formatted(Formatting.GOLD)
+        ));
+    }
+
+    private ItemStack createBackButton() {
+        return createPreviewStack("minecraft:barrier", "Back", List.of(Text.literal("Return to the contract browser.").formatted(Formatting.GRAY)));
+    }
+
+    private ItemStack createClearButton(ServerPlayerEntity player) {
+        ContractDefinition selected = selected(player);
+        return createPreviewStack("minecraft:redstone_torch", "Clear Selected", List.of(
+                Text.literal(selected == null ? "No contract selected." : "Clear: " + selected.name()).formatted(Formatting.GRAY),
+                Text.literal("Remove your active contract.").formatted(Formatting.DARK_GRAY)
+        ));
+    }
+
+    private ItemStack createPageButton(int page, int totalPages, boolean previous) {
+        boolean available = previous ? page > 0 : page < totalPages - 1;
+        String label = previous ? "Previous Page" : "Next Page";
+        return createPreviewStack("minecraft:arrow", label, List.of(
+                Text.literal("Page " + (page + 1) + " of " + totalPages).formatted(Formatting.GRAY),
+                Text.literal(available ? "Click to switch pages." : "No more pages in this direction.").formatted(available ? Formatting.AQUA : Formatting.DARK_GRAY)
+        ));
+    }
+
+    private List<ContractDefinition> contractsFor(ServerPlayerEntity player, String categoryKey) {
+        List<ContractDefinition> contracts = switch (categoryKey) {
+            case "mining" -> bundleSupplier.get().contractCatalog().contractsOfType(ContractType.MINING);
+            case "hunting" -> bundleSupplier.get().contractCatalog().contractsOfType(ContractType.HUNTING);
+            default -> List.of();
+        };
+        return contracts.stream()
+                .filter(contract -> contract.repeatable() || !contractService.hasCompletedContract(player.getUuid(), contract.id()))
+                .toList();
+    }
+
+    private List<ContractDefinition> pagedContracts(List<ContractDefinition> contracts, int page) {
+        int perPage = Math.max(1, ITEM_SLOT_COUNT);
+        int totalPages = Math.max(1, (int) Math.ceil(contracts.size() / (double) perPage));
+        int actualPage = Math.max(0, Math.min(totalPages - 1, page));
+        int from = actualPage * perPage;
+        int to = Math.min(contracts.size(), from + perPage);
+        return contracts.subList(from, to);
+    }
+
+    private int totalPages(ServerPlayerEntity player, String categoryKey) {
+        return Math.max(1, (int) Math.ceil(contractsFor(player, categoryKey).size() / (double) ITEM_SLOT_COUNT));
+    }
+
+    private String categoryLabel(String categoryKey) {
+        return switch (categoryKey) {
+            case "mining" -> "Mining Contracts";
+            case "hunting" -> "Hunting Contracts";
+            default -> "Contracts";
+        };
+    }
+
+    private SimpleInventory filledInventory(int rows) {
+        SimpleInventory inventory = new SimpleInventory(rows * 9);
+        ItemStack filler = createPreviewStack(bundleSupplier.get().config().shop().fillerItemId(), " ", List.of());
+        filler.remove(DataComponentTypes.LORE);
+        for (int slot = 0; slot < inventory.size(); slot++) {
+            inventory.setStack(slot, filler.copy());
+        }
+        return inventory;
+    }
+
+    private ItemStack createPreviewStack(String itemId, String name, List<Text> lore) {
+        ItemStack stack = rewardService.createPreviewStack(itemId, name, lore);
+        return stack;
+    }
+
+    private record HomeView(int page) implements View {
+        @Override
+        public int rows() {
+            return PAGE_ROWS;
+        }
+    }
+
+    private record CategoryView(String categoryKey, int page) implements View {
+        @Override
+        public int rows() {
+            return PAGE_ROWS;
+        }
+    }
+
+    public sealed interface View permits HomeView, CategoryView {
+        int rows();
+    }
+}

src/main/java/com/g2806/soulsteal/contract/ContractScreenHandler.java

@@ -0,0 +1,64 @@
+package com.g2806.soulsteal.contract;
+
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.entity.player.PlayerInventory;
+import net.minecraft.inventory.SimpleInventory;
+import net.minecraft.item.ItemStack;
+import net.minecraft.screen.ScreenHandler;
+import net.minecraft.screen.ScreenHandlerType;
+import net.minecraft.screen.slot.Slot;
+import net.minecraft.screen.slot.SlotActionType;
+import net.minecraft.server.network.ServerPlayerEntity;
+
+/**
+ * Generic container handler that turns contract GUI clicks into selection actions.
+ */
+public final class ContractScreenHandler extends ScreenHandler {
+    private final SimpleInventory inventory;
+    private final ContractGuiService guiService;
+    private final ContractGuiService.View view;
+
+    public ContractScreenHandler(int syncId, PlayerInventory playerInventory, ContractGuiService guiService, ContractGuiService.View view) {
+        super(view.rows() == 3 ? ScreenHandlerType.GENERIC_9X3 : ScreenHandlerType.GENERIC_9X6, syncId);
+        this.guiService = guiService;
+        this.view = view;
+        this.inventory = guiService.createInventory((ServerPlayerEntity) playerInventory.player, view);
+
+        int rows = view.rows();
+        for (int row = 0; row < rows; row++) {
+            for (int column = 0; column < 9; column++) {
+                int slotIndex = row * 9 + column;
+                this.addSlot(new Slot(inventory, slotIndex, 8 + column * 18, 18 + row * 18));
+            }
+        }
+
+        int playerInventoryY = 18 + rows * 18 + 14;
+        for (int row = 0; row < 3; row++) {
+            for (int column = 0; column < 9; column++) {
+                this.addSlot(new Slot(playerInventory, column + row * 9 + 9, 8 + column * 18, playerInventoryY + row * 18));
+            }
+        }
+
+        int hotbarY = playerInventoryY + 58;
+        for (int column = 0; column < 9; column++) {
+            this.addSlot(new Slot(playerInventory, column, 8 + column * 18, hotbarY));
+        }
+    }
+
+    @Override
+    public ItemStack quickMove(PlayerEntity player, int slot) {
+        return ItemStack.EMPTY;
+    }
+
+    @Override
+    public boolean canUse(PlayerEntity player) {
+        return true;
+    }
+
+    @Override
+    public void onSlotClick(int slotIndex, int button, SlotActionType actionType, PlayerEntity player) {
+        if (player instanceof ServerPlayerEntity serverPlayer && slotIndex >= 0 && slotIndex < inventory.size()) {
+            guiService.handleClick(serverPlayer, view, slotIndex);
+        }
+    }
+}

src/main/java/com/g2806/soulsteal/contract/ContractType.java

@@ -0,0 +1,6 @@
+package com.g2806.soulsteal.contract;
+
+public enum ContractType {
+    MINING,
+    HUNTING
+}

src/main/java/com/g2806/soulsteal/data/SoulStealData.java

@@ -22,6 +22,9 @@ public final class SoulStealData {
     private Map<String, Long> bountyPlacementCooldowns = new HashMap<>();
     private Map<String, String> playerNames = new HashMap<>();
     private Map<String, Boolean> scoreboardVisibility = new HashMap<>();
+    private Map<String, String> selectedContracts = new HashMap<>();
+    private Map<String, Map<String, Long>> contractProgress = new HashMap<>();
+    private Map<String, Set<String>> completedContracts = new HashMap<>();
 
     public SoulStealData normalize() {
         if (souls == null) {
@@ -48,38 +51,99 @@ public final class SoulStealData {
         if (scoreboardVisibility == null) {
             scoreboardVisibility = new HashMap<>();
         }
+        if (selectedContracts == null) {
+            selectedContracts = new HashMap<>();
+        }
+        if (contractProgress == null) {
+            contractProgress = new HashMap<>();
+        }
+        if (completedContracts == null) {
+            completedContracts = new HashMap<>();
+        }
         return this;
     }
 
+    /**
+     * Returns the persistent soul balance table keyed by player UUID string.
+     *
+     * @return mutable soul balance map
+     */
     public Map<String, Long> souls() {
         return souls;
     }
 
+    /**
+     * Returns the active bounty list.
+     *
+     * @return mutable list of active bounties
+     */
     public List<StoredBounty> activeBounties() {
         return activeBounties;
     }
 
+    /**
+     * Returns the set of shop entries unlocked per player.
+     *
+     * @return mutable unlock table
+     */
     public Map<String, Set<String>> unlockedEntries() {
         return unlockedEntries;
     }
 
+    /**
+     * Returns the per-entry purchase cooldown table.
+     *
+     * @return mutable cooldown map
+     */
     public Map<String, Map<String, Long>> purchaseCooldowns() {
         return purchaseCooldowns;
     }
 
+    /**
+     * Returns the internal permission fallback table.
+     *
+     * @return mutable permission map
+     */
     public Map<String, Map<String, Boolean>> grantedPermissions() {
         return grantedPermissions;
     }
 
+    /**
+     * Returns the bounty placement cooldown table.
+     *
+     * @return mutable placement cooldown map
+     */
     public Map<String, Long> bountyPlacementCooldowns() {
         return bountyPlacementCooldowns;
     }
 
+    /**
+     * Returns the last known player names table.
+     *
+     * @return mutable player-name map
+     */
     public Map<String, String> playerNames() {
         return playerNames;
     }
 
+    /**
+     * Returns the per-player scoreboard visibility table.
+     *
+     * @return mutable scoreboard visibility map
+     */
     public Map<String, Boolean> scoreboardVisibility() {
         return scoreboardVisibility;
     }
+
+    public Map<String, String> selectedContracts() {
+        return selectedContracts;
+    }
+
+    public Map<String, Map<String, Long>> contractProgress() {
+        return contractProgress;
+    }
+
+    public Map<String, Set<String>> completedContracts() {
+        return completedContracts;
+    }
 }

src/main/java/com/g2806/soulsteal/data/SoulStealDataStore.java

@@ -29,6 +29,11 @@ public final class SoulStealDataStore {
         this.dataFile = dataDirectory.resolve("soulsteal-data.json");
     }
 
+    /**
+     * Loads persistent state from disk, creating a new file if needed.
+     *
+     * @throws IOException if the file cannot be read or created
+     */
     public synchronized void load() throws IOException {
         Files.createDirectories(dataDirectory);
         if (Files.notExists(dataFile)) {
@@ -43,10 +48,20 @@ public final class SoulStealDataStore {
         }
     }
 
+    /**
+     * Returns the in-memory persistent data snapshot.
+     *
+     * @return mutable data model used by the running server
+     */
     public synchronized SoulStealData data() {
         return data;
     }
 
+    /**
+     * Saves the current in-memory state to disk atomically when possible.
+     *
+     * @throws IOException if the file cannot be written
+     */
     public synchronized void save() throws IOException {
         Files.createDirectories(dataDirectory);
         Path tempFile = dataFile.resolveSibling(dataFile.getFileName() + ".tmp");

src/main/java/com/g2806/soulsteal/data/StoredBounty.java

@@ -18,14 +18,29 @@ public record StoredBounty(
         long createdAtEpochMillis,
         long expiresAtEpochMillis
 ) {
+    /**
+     * Parses the bounty id as a UUID.
+     *
+     * @return bounty UUID
+     */
     public UUID idAsUuid() {
         return UUID.fromString(id);
     }
 
+    /**
+     * Parses the placer id as a UUID.
+     *
+     * @return placer UUID
+     */
     public UUID placerUuidAsUuid() {
         return UUID.fromString(placerUuid);
     }
 
+    /**
+     * Parses the target id as a UUID.
+     *
+     * @return target UUID
+     */
     public UUID targetUuidAsUuid() {
         return UUID.fromString(targetUuid);
     }

src/main/java/com/g2806/soulsteal/service/BountyService.java

@@ -24,6 +24,18 @@ public final class BountyService {
         this.soulService = soulService;
     }
 
+    /**
+     * Attempts to place a bounty on a target player.
+     *
+     * @param placerUuid player paying for the bounty
+     * @param placerName display name used for messages
+     * @param targetUuid target player UUID
+     * @param targetName target display name used for messages
+     * @param amount bounty value in souls
+     * @param durationSeconds bounty lifetime in seconds
+     * @param nowEpochMillis current time used for cooldown and expiry calculations
+     * @return placement outcome and the created bounty when successful
+     */
     public PlaceBountyResult placeBounty(
             UUID placerUuid,
             String placerName,
@@ -86,6 +98,13 @@ public final class BountyService {
         return new PlaceBountyResult(true, "Bounty placed successfully.", bounty);
     }
 
+    /**
+     * Claims all active bounties on a target after a successful kill.
+     *
+     * @param killerUuid player receiving the payout
+     * @param targetUuid target player whose bounties may be claimed
+     * @return the combined payout and the list of claimed bounties
+     */
     public ClaimBountyResult claimForKill(UUID killerUuid, UUID targetUuid) {
         List<StoredBounty> claimed = new ArrayList<>();
         Iterator<StoredBounty> iterator = dataStore.data().activeBounties().iterator();
@@ -110,6 +129,12 @@ public final class BountyService {
         return new ClaimBountyResult(reward, claimed);
     }
 
+    /**
+     * Clears all active bounties on a target without paying them out.
+     *
+     * @param targetUuid target player UUID
+     * @return the removed bounty records
+     */
     public List<StoredBounty> clearForTarget(UUID targetUuid) {
         List<StoredBounty> removed = new ArrayList<>();
         Iterator<StoredBounty> iterator = dataStore.data().activeBounties().iterator();
@@ -132,6 +157,12 @@ public final class BountyService {
         return removed;
     }
 
+    /**
+     * Processes expired bounties and pays the configured survivor reward where applicable.
+     *
+     * @param nowEpochMillis current time used to determine expiration
+     * @return payout records for every expired bounty handled in this pass
+     */
     public List<ExpiredBountyPayout> processExpirations(long nowEpochMillis) {
         SoulStealConfig.BountyConfig bountyConfig = configSupplier.get().bounty();
         List<ExpiredBountyPayout> payouts = new ArrayList<>();
@@ -157,15 +188,32 @@ public final class BountyService {
         return payouts;
     }
 
+    /**
+     * Returns a snapshot of all active bounties.
+     *
+     * @return immutable copy of the current active bounty list
+     */
     public List<StoredBounty> activeBounties() {
         return List.copyOf(dataStore.data().activeBounties());
     }
 
+    /**
+     * Returns all active bounties for a specific target player.
+     *
+     * @param targetUuid target player UUID
+     * @return bounties currently assigned to that player
+     */
     public List<StoredBounty> activeBountiesForTarget(UUID targetUuid) {
         String targetKey = key(targetUuid);
         return dataStore.data().activeBounties().stream().filter(bounty -> bounty.targetUuid().equals(targetKey)).toList();
     }
 
+    /**
+     * Returns the next time the given placer may create another bounty.
+     *
+     * @param placerUuid player UUID to inspect
+     * @return epoch milliseconds when the placement cooldown ends, or {@code 0} if none exists
+     */
     public long nextPlacementTime(UUID placerUuid) {
         return dataStore.data().bountyPlacementCooldowns().getOrDefault(key(placerUuid), 0L);
     }

src/main/java/com/g2806/soulsteal/service/ContractService.java

@@ -0,0 +1,123 @@
+package com.g2806.soulsteal.service;
+
+import com.g2806.soulsteal.contract.ContractCatalog;
+import com.g2806.soulsteal.contract.ContractDefinition;
+import com.g2806.soulsteal.contract.ContractType;
+import com.g2806.soulsteal.data.SoulStealDataStore;
+import java.io.IOException;
+import java.io.UncheckedIOException;
+import java.util.Map;
+import java.util.Optional;
+import java.util.UUID;
+import java.util.function.Supplier;
+import net.minecraft.server.network.ServerPlayerEntity;
+
+public final class ContractService {
+    private final Supplier<ContractCatalog> catalogSupplier;
+    private final SoulStealDataStore dataStore;
+    private final SoulService soulService;
+
+    public ContractService(Supplier<ContractCatalog> catalogSupplier, SoulStealDataStore dataStore, SoulService soulService) {
+        this.catalogSupplier = catalogSupplier;
+        this.dataStore = dataStore;
+        this.soulService = soulService;
+    }
+
+    public Optional<ContractDefinition> selectedContract(UUID playerUuid) {
+        String contractId = dataStore.data().selectedContracts().get(key(playerUuid));
+        if (contractId == null) {
+            return Optional.empty();
+        }
+        return catalogSupplier.get().contract(contractId);
+    }
+
+    public boolean selectContract(ServerPlayerEntity player, String contractId) {
+        Optional<ContractDefinition> contract = catalogSupplier.get().contract(contractId);
+        if (contract.isEmpty()) {
+            return false;
+        }
+        if (!contract.get().repeatable() && hasCompletedContract(player.getUuid(), contract.get().id())) {
+            return false;
+        }
+        dataStore.data().selectedContracts().put(key(player.getUuid()), contract.get().id());
+        dataStore.data().contractProgress().remove(key(player.getUuid()));
+        saveQuietly();
+        return true;
+    }
+
+    public void clearContract(UUID playerUuid) {
+        dataStore.data().selectedContracts().remove(key(playerUuid));
+        dataStore.data().contractProgress().remove(key(playerUuid));
+        saveQuietly();
+    }
+
+    public long progress(UUID playerUuid) {
+        return dataStore.data().contractProgress()
+                .getOrDefault(key(playerUuid), Map.of())
+                .values().stream().mapToLong(Long::longValue).sum();
+    }
+
+    public long progress(UUID playerUuid, String contractId) {
+        return dataStore.data().contractProgress()
+                .getOrDefault(key(playerUuid), Map.of())
+                .getOrDefault(contractId, 0L);
+    }
+
+    public boolean hasCompletedContract(UUID playerUuid, String contractId) {
+        return dataStore.data().completedContracts()
+                .getOrDefault(key(playerUuid), java.util.Set.of())
+                .contains(contractId);
+    }
+
+    public void recordMining(ServerPlayerEntity player, String blockId) {
+        record(player, ContractType.MINING, blockId);
+    }
+
+    public void recordHunting(ServerPlayerEntity player, String entityId) {
+        record(player, ContractType.HUNTING, entityId);
+    }
+
+    private void record(ServerPlayerEntity player, ContractType type, String targetId) {
+        Optional<ContractDefinition> selected = selectedContract(player.getUuid());
+        if (selected.isEmpty() || !catalogSupplier.get().enabled()) {
+            return;
+        }
+        ContractDefinition contract = selected.get();
+        if (contract.type() != type || !contract.targetId().equalsIgnoreCase(targetId)) {
+            return;
+        }
+
+        String playerKey = key(player.getUuid());
+        Map<String, Long> progressMap = dataStore.data().contractProgress().computeIfAbsent(playerKey, ignored -> new java.util.HashMap<>());
+        long updated = progressMap.getOrDefault(contract.id(), 0L) + 1L;
+        if (updated >= contract.amountRequired()) {
+            progressMap.remove(contract.id());
+            soulService.addSouls(player.getUuid(), contract.reward());
+            player.sendMessage(net.minecraft.text.Text.literal("Contract complete: " + contract.name() + " (+"
+                    + contract.reward() + " souls)").formatted(net.minecraft.util.Formatting.GREEN), false);
+            if (!contract.repeatable()) {
+                dataStore.data().completedContracts()
+                        .computeIfAbsent(playerKey, ignored -> new java.util.HashSet<>())
+                        .add(contract.id());
+            }
+            if (!contract.repeatable()) {
+                dataStore.data().selectedContracts().remove(playerKey);
+            }
+        } else {
+            progressMap.put(contract.id(), updated);
+        }
+        saveQuietly();
+    }
+
+    private void saveQuietly() {
+        try {
+            dataStore.save();
+        } catch (IOException exception) {
+            throw new UncheckedIOException("Failed to persist contract data.", exception);
+        }
+    }
+
+    private static String key(UUID playerUuid) {
+        return playerUuid.toString();
+    }
+}

src/main/java/com/g2806/soulsteal/service/HudService.java

@@ -3,6 +3,7 @@ package com.g2806.soulsteal.service;
 import com.g2806.soulsteal.config.SoulStealConfig;
 import com.g2806.soulsteal.data.SoulStealDataStore;
 import com.g2806.soulsteal.data.StoredBounty;
+import com.g2806.soulsteal.service.ContractService;
 import com.g2806.soulsteal.util.DurationFormatter;
 import java.io.IOException;
 import java.io.UncheckedIOException;
@@ -31,6 +32,7 @@ import net.minecraft.scoreboard.number.BlankNumberFormat;
 import net.minecraft.server.MinecraftServer;
 import net.minecraft.server.network.ServerPlayerEntity;
 import net.minecraft.text.Text;
+import net.minecraft.util.Formatting;
 
 /** Owns toggleable HUD state, player names, leaderboard data, and wanted-player bossbars. */
 public final class HudService {
@@ -38,6 +40,7 @@ public final class HudService {
     private final SoulStealDataStore dataStore;
     private final SoulService soulService;
     private final BountyService bountyService;
+    private final ContractService contractService;
     private final Map<UUID, SidebarState> sidebars = new HashMap<>();
     private final Map<UUID, ServerBossBar> bountyBossBars = new HashMap<>();
 
@@ -45,24 +48,42 @@ public final class HudService {
             Supplier<SoulStealConfig> configSupplier,
             SoulStealDataStore dataStore,
             SoulService soulService,
-            BountyService bountyService
+            BountyService bountyService,
+            ContractService contractService
     ) {
         this.configSupplier = configSupplier;
         this.dataStore = dataStore;
         this.soulService = soulService;
         this.bountyService = bountyService;
+        this.contractService = contractService;
     }
 
+    /**
+     * Records player metadata and refreshes their HUD state when they join.
+     *
+     * @param player joining player
+     */
     public void handlePlayerJoin(ServerPlayerEntity player) {
         rememberPlayer(player);
         refreshPlayerDisplays(player, System.currentTimeMillis());
     }
 
+    /**
+     * Clears any per-player HUD state when a player disconnects.
+     *
+     * @param player disconnecting player
+     */
     public void handlePlayerDisconnect(ServerPlayerEntity player) {
         clearSidebar(player);
         clearBossBar(player);
     }
 
+    /**
+     * Refreshes active HUD elements for all online players and trims stale state.
+     *
+     * @param server current server instance
+     * @param nowEpochMillis current time used for countdown calculations
+     */
     public void tick(MinecraftServer server, long nowEpochMillis) {
         Set<UUID> onlinePlayers = new HashSet<>();
         for (ServerPlayerEntity player : server.getPlayerManager().getPlayerList()) {
@@ -81,11 +102,24 @@ public final class HudService {
         });
     }
 
+    /**
+     * Returns whether the given player's scoreboard sidebar is currently visible.
+     *
+     * @param playerUuid player UUID to inspect
+     * @return current visibility state, falling back to the config default
+     */
     public boolean isScoreboardVisible(UUID playerUuid) {
         return dataStore.data().scoreboardVisibility()
                 .getOrDefault(key(playerUuid), configSupplier.get().hud().scoreboard().defaultVisible());
     }
 
+    /**
+     * Sets scoreboard visibility for a player and refreshes their sidebar immediately.
+     *
+     * @param player player to update
+     * @param visible requested visibility state
+     * @return the stored visibility state
+     */
     public boolean setScoreboardVisible(ServerPlayerEntity player, boolean visible) {
         rememberPlayer(player);
         Boolean previous = dataStore.data().scoreboardVisibility().put(key(player.getUuid()), visible);
@@ -96,10 +130,22 @@ public final class HudService {
         return visible;
     }
 
+    /**
+     * Flips the scoreboard visibility flag for a player.
+     *
+     * @param player player to update
+     * @return the updated visibility state
+     */
     public boolean toggleScoreboardVisible(ServerPlayerEntity player) {
         return setScoreboardVisible(player, !isScoreboardVisible(player.getUuid()));
     }
 
+    /**
+     * Builds a leaderboard page from stored names and balances.
+     *
+     * @param requestedPage 1-based page number requested by the caller
+     * @return the clamped leaderboard page and its entries
+     */
     public LeaderboardPage leaderboard(int requestedPage) {
         Set<String> playerKeys = new HashSet<>(dataStore.data().playerNames().keySet());
         playerKeys.addAll(dataStore.data().souls().keySet());
@@ -196,19 +242,29 @@ public final class HudService {
 
     private List<Text> buildSidebarLines(ServerPlayerEntity player, long nowEpochMillis) {
         List<StoredBounty> activeBounties = bountyService.activeBountiesForTarget(player.getUuid());
-        long totalValue = activeBounties.stream().mapToLong(StoredBounty::soulValue).sum();
-        long remainingSeconds = activeBounties.stream()
-                .mapToLong(StoredBounty::expiresAtEpochMillis)
-                .max()
-            .orElse(nowEpochMillis);
-        remainingSeconds = Math.max(0L, (remainingSeconds - nowEpochMillis + 999L) / 1000L);
+        List<Text> lines = new ArrayList<>();
+        lines.add(Text.literal("Souls: " + soulService.balanceOf(player.getUuid())).formatted(Formatting.GOLD));
 
-        return List.of(
-                Text.literal("Souls: " + soulService.balanceOf(player.getUuid())),
-                Text.literal("Bounties: " + activeBounties.size()),
-                Text.literal("Wanted Value: " + totalValue),
-                Text.literal("Wanted Time: " + (remainingSeconds > 0L ? DurationFormatter.formatSeconds(remainingSeconds) : "None"))
-        );
+        contractService.selectedContract(player.getUuid()).ifPresent(contract -> {
+            long progress = contractService.progress(player.getUuid(), contract.id());
+            lines.add(Text.literal("Contract: " + contract.name()).formatted(Formatting.AQUA));
+            lines.add(Text.literal("Progress: " + progress + "/" + contract.amountRequired()).formatted(Formatting.GRAY));
+        });
+
+        if (!activeBounties.isEmpty()) {
+            long totalValue = activeBounties.stream().mapToLong(StoredBounty::soulValue).sum();
+            long remainingSeconds = activeBounties.stream()
+                    .mapToLong(StoredBounty::expiresAtEpochMillis)
+                    .max()
+                    .orElse(nowEpochMillis);
+            remainingSeconds = Math.max(0L, (remainingSeconds - nowEpochMillis + 999L) / 1000L);
+
+            lines.add(Text.literal("Bounties: " + activeBounties.size()).formatted(Formatting.RED));
+            lines.add(Text.literal("Wanted Value: " + totalValue).formatted(Formatting.GOLD));
+            lines.add(Text.literal("Wanted Time: " + DurationFormatter.formatSeconds(remainingSeconds)).formatted(Formatting.DARK_RED));
+        }
+
+        return lines;
     }
 
     private void clearSidebar(ServerPlayerEntity player) {
@@ -238,7 +294,7 @@ public final class HudService {
         return scoreboard.addObjective(
                 objectiveName,
                 ScoreboardCriterion.DUMMY,
-                Text.literal(configSupplier.get().hud().scoreboard().title()),
+                Text.literal(configSupplier.get().hud().scoreboard().title()).formatted(Formatting.DARK_AQUA),
                 ScoreboardCriterion.RenderType.INTEGER,
                 false,
                 BlankNumberFormat.INSTANCE

src/main/java/com/g2806/soulsteal/service/PermissionService.java

@@ -26,6 +26,14 @@ public final class PermissionService {
         this.dataStore = dataStore;
     }
 
+    /**
+     * Checks whether a command source has a permission node.
+     *
+     * @param source permission subject
+     * @param permission node to check
+     * @param defaultLevel fallback operator level when no permission backend is available
+     * @return {@code true} if the source is allowed to use the permission
+     */
     public boolean has(ServerCommandSource source, String permission, int defaultLevel) {
         if (source.getPlayer() != null && hasStoredPermission(source.getPlayer().getUuid(), permission)) {
             return true;
@@ -39,6 +47,14 @@ public final class PermissionService {
         return source.getPlayer() == null || defaultLevel <= 0;
     }
 
+    /**
+     * Checks whether a source has any permission from the provided set.
+     *
+     * @param source permission subject
+     * @param defaultLevel fallback operator level when no permission backend is available
+     * @param permissions candidate permissions to check
+     * @return {@code true} if at least one permission is granted
+     */
     public boolean hasAny(ServerCommandSource source, int defaultLevel, String... permissions) {
         for (String permission : permissions) {
             if (permission != null && !permission.isBlank() && has(source, permission, defaultLevel)) {
@@ -48,6 +64,14 @@ public final class PermissionService {
         return false;
     }
 
+    /**
+     * Checks whether a player has a permission node.
+     *
+     * @param player permission subject
+     * @param permission node to check
+     * @param defaultValue fallback value when no permission backend is available
+     * @return {@code true} if the player is allowed to use the permission
+     */
     public boolean has(ServerPlayerEntity player, String permission, boolean defaultValue) {
         if (hasStoredPermission(player.getUuid(), permission)) {
             return true;
@@ -61,6 +85,14 @@ public final class PermissionService {
         return defaultValue;
     }
 
+    /**
+     * Checks whether a player has any permission from the provided set.
+     *
+     * @param player permission subject
+     * @param defaultValue fallback value when no permission backend is available
+     * @param permissions candidate permissions to check
+     * @return {@code true} if at least one permission is granted
+     */
     public boolean hasAny(ServerPlayerEntity player, boolean defaultValue, String... permissions) {
         for (String permission : permissions) {
             if (permission != null && !permission.isBlank() && has(player, permission, defaultValue)) {
@@ -70,6 +102,15 @@ public final class PermissionService {
         return false;
     }
 
+    /**
+     * Grants a permission through LuckPerms if available and optionally stores a fallback copy.
+     *
+     * @param playerUuid player receiving the permission
+     * @param permission node to grant or revoke
+     * @param value desired node value
+     * @param storeFallback whether to persist the value in Soul Steal's internal store
+     * @return grant outcome and backend details
+     */
     public GrantResult grantPersistentPermission(UUID playerUuid, String permission, boolean value, boolean storeFallback) {
         boolean grantedViaLuckPerms = tryGrantWithLuckPerms(playerUuid, permission, value);
         boolean storedInternally = false;

src/main/java/com/g2806/soulsteal/service/ShopService.java

@@ -61,6 +61,13 @@ public final class ShopService {
         this.dataStore = dataStore;
     }
 
+    /**
+     * Opens the shop UI for either the home view or a specific category.
+     *
+     * @param player player to show the UI to
+     * @param requestedCategoryKey category key to open, or {@code null} for the home view
+     * @param requestedPage zero-based page index to display
+     */
     public void openShop(ServerPlayerEntity player, String requestedCategoryKey, int requestedPage) {
         if (requestedCategoryKey == null || requestedCategoryKey.isBlank()) {
             openView(player, resolveHomeView(requestedPage));
@@ -70,6 +77,13 @@ public final class ShopService {
         openView(player, resolveCategoryView(requestedCategoryKey, requestedPage));
     }
 
+    /**
+     * Builds the backing inventory for a specific shop view.
+     *
+     * @param player player who will interact with the inventory
+     * @param view resolved shop view state
+     * @return inventory contents appropriate for the supplied view
+     */
     public SimpleInventory createInventory(ServerPlayerEntity player, ShopView view) {
         return switch (view) {
             case HomeView homeView -> createHomeInventory(player, homeView);
@@ -78,6 +92,13 @@ public final class ShopService {
         };
     }
 
+    /**
+     * Dispatches a click inside the shop GUI to the correct view handler.
+     *
+     * @param player player interacting with the shop
+     * @param view current resolved view
+     * @param slotIndex clicked slot index
+     */
     public void handleClick(ServerPlayerEntity player, ShopView view, int slotIndex) {
         switch (view) {
             case HomeView homeView -> handleHomeClick(player, homeView, slotIndex);

src/main/java/com/g2806/soulsteal/service/SoulService.java

@@ -18,15 +18,35 @@ public final class SoulService {
         this.dataStore = dataStore;
     }
 
+    /**
+     * Looks up the stored balance for a player UUID.
+     *
+     * @param playerUuid player identifier to inspect
+     * @return the current balance, or the configured starting balance for new players
+     */
     public long balanceOf(UUID playerUuid) {
         SoulStealConfig.EconomyConfig economy = configSupplier.get().economy();
         return dataStore.data().souls().getOrDefault(key(playerUuid), economy.startingSouls());
     }
 
+    /**
+     * Checks whether a player currently has at least the requested amount of souls.
+     *
+     * @param playerUuid player identifier to inspect
+     * @param amount amount to compare against
+     * @return {@code true} when the player has enough souls
+     */
     public boolean hasSouls(UUID playerUuid, long amount) {
         return balanceOf(playerUuid) >= Math.max(0L, amount);
     }
 
+    /**
+     * Adds souls to a player's balance and clamps the result to the configured maximum.
+     *
+     * @param playerUuid player identifier to update
+     * @param amount amount to add
+     * @return the updated balance after clamping
+     */
     public long addSouls(UUID playerUuid, long amount) {
         if (amount <= 0L) {
             return balanceOf(playerUuid);
@@ -39,6 +59,13 @@ public final class SoulService {
         return updated;
     }
 
+    /**
+     * Removes souls from a player's balance and clamps the result at zero.
+     *
+     * @param playerUuid player identifier to update
+     * @param amount amount to remove
+     * @return the updated balance after clamping
+     */
     public long removeSouls(UUID playerUuid, long amount) {
         if (amount <= 0L) {
             return balanceOf(playerUuid);
@@ -50,11 +77,23 @@ public final class SoulService {
         return updated;
     }
 
+    /**
+     * Sets a player's balance directly, applying the configured upper bound.
+     *
+     * @param playerUuid player identifier to update
+     * @param amount requested new balance
+     */
     public void setSouls(UUID playerUuid, long amount) {
         SoulStealConfig.EconomyConfig economy = configSupplier.get().economy();
         updateBalance(playerUuid, Math.max(0L, Math.min(economy.maxSouls(), amount)));
     }
 
+    /**
+     * Applies the configured death penalty to a player.
+     *
+     * @param playerUuid player identifier to penalize
+     * @return the amount removed and the new balance after applying the penalty
+     */
     public SoulChange applyDeathPenalty(UUID playerUuid) {
         long current = balanceOf(playerUuid);
         if (current <= 0L) {
@@ -73,6 +112,14 @@ public final class SoulService {
         return new SoulChange(-boundedLoss, newBalance);
     }
 
+    /**
+     * Transfers souls between two players if the transfer rules allow it.
+     *
+     * @param senderUuid source player UUID
+     * @param receiverUuid destination player UUID
+     * @param amount amount to transfer
+     * @return the transfer result, including balances and a human-readable message
+     */
     public TransferResult transfer(UUID senderUuid, UUID receiverUuid, long amount) {
         SoulStealConfig.TransferConfig transferConfig = configSupplier.get().economy().transfer();
         if (!transferConfig.enabled()) {

src/main/java/com/g2806/soulsteal/util/DurationFormatter.java

@@ -5,6 +5,12 @@ public final class DurationFormatter {
     private DurationFormatter() {
     }
 
+    /**
+     * Formats a duration in seconds into a compact human-readable string.
+     *
+     * @param totalSeconds duration to format
+     * @return formatted duration such as {@code 2h 5m 10s}
+     */
     public static String formatSeconds(long totalSeconds) {
         if (totalSeconds <= 0L) {
             return "0s";

src/main/java/com/g2806/soulsteal/util/SoulTexts.java

@@ -9,22 +9,52 @@ public final class SoulTexts {
     private SoulTexts() {
     }
 
+    /**
+     * Builds an informational chat message.
+     *
+     * @param message message body without the shared prefix
+     * @return formatted chat text
+     */
     public static Text info(String message) {
         return prefixed(message, Formatting.GRAY);
     }
 
+    /**
+     * Builds a success chat message.
+     *
+     * @param message message body without the shared prefix
+     * @return formatted chat text
+     */
     public static Text success(String message) {
         return prefixed(message, Formatting.GREEN);
     }
 
+    /**
+     * Builds a warning chat message.
+     *
+     * @param message message body without the shared prefix
+     * @return formatted chat text
+     */
     public static Text warning(String message) {
         return prefixed(message, Formatting.GOLD);
     }
 
+    /**
+     * Builds an error chat message.
+     *
+     * @param message message body without the shared prefix
+     * @return formatted chat text
+     */
     public static Text error(String message) {
         return prefixed(message, Formatting.RED);
     }
 
+    /**
+     * Builds highlighted accent text without the standard prefix.
+     *
+     * @param message text to accent
+     * @return formatted text component
+     */
     public static MutableText accent(String message) {
         return Text.literal(message).formatted(Formatting.AQUA);
     }