> For the complete documentation index, see [llms.txt](https://threadforge.gitbook.io/threadlink-documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://threadforge.gitbook.io/threadlink-documentation/getting-started/requirements.md).

# Requirements

## Unity

Threadlink 6.6 is developed and tested on **Unity 6000.6.5f1**. It uses recent editor APIs, such as the `Unity.Scripting.LifecycleManagement` attributes (`[OnEnteringPlayMode]`, `[OnExitingPlayMode]`, `[AutoStaticsCleanup]`) and the main-toolbar extension API. Earlier versions are untested.

## Required packages

| Package                                 | Version in the reference project | Used by                                                                                    |
| --------------------------------------- | -------------------------------- | ------------------------------------------------------------------------------------------ |
| Addressables (`com.unity.addressables`) | 2.11.2                           | Every scene, prefab and asset loaded at runtime, including the configuration assets.       |
| Input System (`com.unity.inputsystem`)  | 1.20.0                           | Dextra: devices, action maps, UI input module.                                             |
| uGUI (`com.unity.ugui`)                 | 2.6.0                            | Dextra's interfaces and selectables.                                                       |
| Collections (`com.unity.collections`)   | 6.6.0                            | Unsafe collections and native memory; brings Mathematics (`int2`, `float2`, `quaternion`). |
| Burst (`com.unity.burst`)               | 2.0.0                            | Dependency of Collections.                                                                 |

## Optional packages

| Package                                          | Effect                                                                                                                                                                        |
| ------------------------------------------------ | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Timeline (`com.unity.timeline`) ≥ 1.8.10         | Defines `THREADLINK_TIMELINE`, enabling the Vault Timeline integration. The reference project uses 6.6.0.                                                                     |
| Localization (`com.unity.localization`) ≥ 1.5.9  | Defines `THREADLINK_LOCALIZATION`, enabling the `LocalizedText` Vault field, localised interaction prompts and the localisation utilities. The reference project uses 1.5.13. |
| Odin Inspector                                   | Defines `ODIN_INSPECTOR`; hash maps, Vault fields and several inspectors draw through Odin.                                                                                   |
| Steamworks.NET (`com.rlabrecque.steamworks.net`) | Required by the Steam Sentinel module, which also requires the `STEAMWORKS_NET` scripting define. Validated against 2025.165.0.                                               |

See [Scripting Defines](/threadlink-documentation/engineer-reference/configuration.md#scripting-defines) for the full list.

## Bundled dependencies

These ship in `Threadlink/Plugins/` and `Threadlink/Editor/`; there is nothing to install.

| Dependency                                                  | Purpose                                                                                                     |
| ----------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------- |
| UniTask                                                     | Every asynchronous API in the framework. `System.Threading.Tasks` is not used.                              |
| ZString                                                     | Allocation-free string building for Scribe and code generation.                                             |
| MessagePack 3.1.4 (with its Unity integration and analyser) | `Threadlink.TrySerialize` / `TryDeserialize`.                                                               |
| SerializeReference UI (`Textus.SerializeReferenceUI`)       | The managed-reference type pickers used by Vault fields and Sentinel Config when Odin is absent.            |
| CSharpier (editor only)                                     | The [Code Formatter](/threadlink-documentation/engineer-reference/editor-tooling.md#code-formatter) window. |