Unity Packages and Services Skill

Package Manager Workflow

The Package Manager window (accessed via Window > Package Manager) manages UPM packages, feature sets, and asset packages.

Core Components

• Navigation panel: Select package contexts (Unity Registry, In Project, My Assets)
• Search box: Locate packages by name
• Sort menu: Sort by name or date
• Filter menu: Narrow results by category or status
• Details panel: View package info, version, dependencies, and changelog
• Action buttons: Install, remove, update, and customize packages

Package States

• Released: Fully tested and verified for the current Unity version
• Pre-release: Available but not yet fully verified
• Experimental: Unstable, indicated by a warning badge
• Built-in: Core Unity features that can be toggled on/off to reduce build size
• Deprecated: No longer maintained

Installing and Managing Packages

Via Package Manager UI

1. Open Window > Package Manager
2. Select Unity Registry to browse available packages
3. Select a package and click Install
4. To update: select installed package, choose new version, click Update
5. To remove: select installed package, click Remove

Via manifest.json

Edit Packages/manifest.json directly to add dependencies:

{
    "dependencies": {
        "com.unity.addressables": "2.9.1",
        "com.unity.cinemachine": "3.1.0",
        "com.unity.inputsystem": "1.19.0"
    }
}

Via Git URL

Add packages from Git repositories:

{
    "dependencies": {
        "com.example.package": "https://github.com/user/repo.git#v1.0.0"
    }
}

Or via the Package Manager UI: click the + button > Add package from git URL.

Package Customization

• Copy to project: The Manage dropdown allows copying UPM packages to project folders for modification
• Mutable packages: Local and embedded packages can have their manifests edited directly
• Built-in toggle: Disable unused built-in packages to reduce build size

Scoped Registries

Scoped registries enable Package Manager to communicate with custom package registry servers, allowing access to multiple package collections simultaneously.

Primary Use Case

Organizations use scoped registries to distribute custom packages internally.

Configuration

Add to Packages/manifest.json:

{
    "scopedRegistries": [
        {
            "name": "My Company Registry",
            "url": "https://npm.mycompany.com",
            "scopes": [
                "com.mycompany",
                "com.mycompany.tools"
            ]
        }
    ],
    "dependencies": {
        "com.mycompany.core-utils": "1.0.0"
    }
}

Configuration Properties

Scope Matching Rules

• Exact package name matches take priority
• Longer namespace matches override shorter ones
• Unmapped packages default to Unity's official registry
• Wildcards and glob patterns are not supported
• Scopes use reverse domain notation (com.example, not @scope)

Registry Compatibility

The registry server must implement the /-/v1/search or /-/all endpoints. Not all npm registries are compatible.

Authentication

For protected registries, configure credentials in your Package Manager user configuration file using npm authentication patterns.

Essential Packages List

Unity 6.3 LTS ships with 133 released (verified) packages. See references/common-packages.md for the full categorized list with IDs and versions.

Most-Used Packages (Quick Reference)

Key UGS Packages

Unity Gaming Services Overview

Unity Gaming Services (UGS) is a suite of backend services for live game operations. Services include Authentication, Cloud Save, Cloud Code, Analytics, Economy, Leaderboards, Friends, Multiplayer, Matchmaker, and more.

Getting Started with UGS

1. Link your Unity project to a UGS project in Edit > Project Settings > Services
2. Install the required service packages via Package Manager
3. Initialize services in code before using them

using Unity.Services.Core;
using UnityEngine;

public class ServicesInitializer : MonoBehaviour
{
    async void Start()
    {
        await UnityServices.InitializeAsync();
        Debug.Log("Unity Services initialized");
    }
}

Authentication

The Authentication service provides player identity management. Install com.unity.services.authentication.

Sign-In Methods

• Anonymous: No credentials required, auto-generates player ID
• Platform-specific: Steam, PlayStation, Xbox, Apple, Google Play, etc.
• Custom authentication: OAuth/OIDC integration
• Unity Player Accounts: Cross-platform identity

Anonymous Sign-In

using Unity.Services.Authentication;
using Unity.Services.Core;
using UnityEngine;

public class AuthManager : MonoBehaviour
{
    async void Start()
    {
        await UnityServices.InitializeAsync();

        AuthenticationService.Instance.SignedIn += () =>
        {
            Debug.Log($"Signed in. Player ID: {AuthenticationService.Instance.PlayerId}");
        };

        await AuthenticationService.Instance.SignInAnonymouslyAsync();
    }
}

Session Management

• Sessions persist automatically across app restarts
• Access token refreshes automatically
• Player ID is consistent across sessions for the same device
• Link multiple sign-in methods to one player ID for cross-platform play

Key API

Cloud Save

Cloud Save persists player data and game state to the cloud. Install com.unity.services.cloudsave.

Data Types

• Player Data: Per-player key-value storage (settings, progress, inventory)
• Game Data: Shared data across all players (leaderboard snapshots, game config)

Saving and Loading Data

using Unity.Services.CloudSave;
using Unity.Services.Core;
using Unity.Services.Authentication;
using UnityEngine;
using System.Collections.Generic;

public class CloudSaveManager : MonoBehaviour
{
    async void Start()
    {
        await UnityServices.InitializeAsync();
        await AuthenticationService.Instance.SignInAnonymouslyAsync();

        // Save data
        var data = new Dictionary<string, object>
        {
            { "playerLevel", 5 },
            { "playerName", "Hero" },
            { "highScore", 12500 }
        };
        await CloudSaveService.Instance.Data.Player.SaveAsync(data);
        Debug.Log("Data saved to cloud");

        // Load data
        var keys = new HashSet<string> { "playerLevel", "highScore" };
        var loadedData = await CloudSaveService.Instance.Data.Player.LoadAsync(keys);

        if (loadedData.TryGetValue("playerLevel", out var levelItem))
        {
            int level = levelItem.Value.GetAs<int>();
            Debug.Log($"Player level: {level}");
        }
    }
}

Key API

Analytics

Unity Analytics tracks player behavior and game events. Install com.unity.services.analytics.

Event Types

• Standard Events: Pre-defined events (e.g., level completion, transaction)
• Custom Events: Developer-defined events with custom parameters

Recording Events

using Unity.Services.Analytics;
using Unity.Services.Core;
using UnityEngine;

public class AnalyticsManager : MonoBehaviour
{
    async void Start()
    {
        await UnityServices.InitializeAsync();
        AnalyticsService.Instance.StartDataCollection();
    }

    public void RecordLevelComplete(int level, float time)
    {
        var parameters = new Dictionary<string, object>
        {
            { "levelIndex", level },
            { "completionTime", time },
            { "livesRemaining", 3 }
        };
        AnalyticsService.Instance.CustomData("levelComplete", parameters);
    }

    public void RecordPurchase(string itemId, float price)
    {
        var parameters = new Dictionary<string, object>
        {
            { "itemId", itemId },
            { "price", price },
            { "currency", "USD" }
        };
        AnalyticsService.Instance.CustomData("itemPurchased", parameters);
    }
}

Data Privacy

• Call AnalyticsService.Instance.StartDataCollection() after obtaining user consent
• Comply with GDPR, CCPA, and platform privacy requirements
• Use AnalyticsService.Instance.StopDataCollection() if user revokes consent

Key API

Common Patterns

Service Initialization Pattern

using Unity.Services.Core;
using Unity.Services.Authentication;
using UnityEngine;

public class GameBootstrap : MonoBehaviour
{
    async void Awake()
    {
        try
        {
            await UnityServices.InitializeAsync();
            await AuthenticationService.Instance.SignInAnonymouslyAsync();
            Debug.Log($"Player ID: {AuthenticationService.Instance.PlayerId}");

            // Now safe to use Cloud Save, Analytics, etc.
        }
        catch (ServicesInitializationException e)
        {
            Debug.LogError($"Services failed to initialize: {e.Message}");
        }
        catch (AuthenticationException e)
        {
            Debug.LogError($"Authentication failed: {e.Message}");
        }
    }
}

Managing Packages via Script

#if UNITY_EDITOR
using UnityEditor.PackageManager;

public static class PackageHelper
{
    // Install: Client.Add("com.unity.cinemachine@3.1.0");
    // Remove:  Client.Remove("com.unity.cinemachine");
    // List:    Client.List();  // Returns ListRequest, poll IsCompleted
}
#endif

Anti-Patterns

1. Not initializing UnityServices before using any service. Always call UnityServices.InitializeAsync() first. All UGS services depend on this.
2. Not authenticating before using Cloud Save or other player-bound services. Authentication is required before accessing per-player data.
3. Collecting analytics without user consent. Call StartDataCollection() only after obtaining consent. Violating privacy regulations risks legal action and platform removal.
4. Storing sensitive data in Cloud Save without encryption. Cloud Save is key-value storage, not a secure vault. Encrypt sensitive data before saving.
5. Hardcoding package versions in manifest.json without checking compatibility. Always verify package versions are compatible with your Unity version. Use the Package Manager UI to check verified versions.
6. Installing packages via git URL for production without pinning a version/tag. Always specify a tag or commit hash (e.g., #v1.0.0) to prevent unexpected breaking changes.
7. Not handling service errors gracefully. UGS calls are async network operations. Always wrap in try/catch and handle offline scenarios.
8. Using Resources.Load instead of Addressables for dynamic content. Resources folder cannot be updated post-build. Addressables support remote content updates.
9. Adding scoped registries with overly broad scopes. Broad scopes like com will route many packages to your custom registry. Use specific scopes like com.mycompany.

Key API Quick Reference

Related Skills

• unity-foundations — Core Unity concepts, project setup, and C# scripting basics
• unity-platforms — Platform targeting, build profiles, and platform-specific optimization

Additional Resources

• Packages Overview
• Package Manager Window
• Scoped Registries
• Released Packages List
• Unity Gaming Services
• Authentication
• Cloud Save
• Analytics