# Customizing Addon Context

This guide shows how to customize the runtime context of an addon.

***

### Overview

Each addon receives an `AddonContext`, which provides access to:

* addon ID
* filesystem paths
* feature manager

By default, OMS creates this context automatically.

However, an addon can customize how the context is built by overriding `configureContext(...)`.

***

### 1. Default behavior

```kotlin
class HelloWorldAddon : OmsAddon(HelloWorldMod.MOD_ID)
```

OMS creates a default `AddonContextSpec` and builds the context internally.

***

### 2. Customizing the context

Override `configureContext(...)` to modify the context specification:

```kotlin
override fun configureContext(spec: AddonContextSpec): AddonContextSpec {
    return spec.copy(
        featureManagerFactory = {
            CustomFeatureManager( ... )
        }
    )
}
```

***

### 3. What can be customized

`AddonContextSpec` allows overriding selected factories:

```kotlin
data class AddonContextSpec(
    val id: String,
    val pathsFactory: (() -> AddonPaths)? = null,
    val featureManagerFactory: (() -> FeatureManager)? = null,
)
```

Typical use cases:

* custom `FeatureManager`
* custom filesystem structure
* specialized infrastructure setup

***

### 4. Important constraints

* `id` must not be changed
* only override what you need
* keep default behavior for everything else

***

### When to use this

Use context customization when:

* default feature manager behavior is not sufficient
* you need a custom filesystem layout
* your addon requires specialized infrastructure

Most addons do not need to override the context.

***

### Notes

* Context is created once during initialization
* It remains stable during runtime
* Features receive the finalized context


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