# World States

***

## Updating World States at Runtime

Write to world state from any script using:

```csharp
// Get the States object for a category and update a key.
WorldStatesRegistry.GetStates("shop")["basketAvailable"] = 0;
```

Any behavior subscribed to `"shop"` will automatically re-plan on the next frame (if `"basketAvailable"` is in that behavior's relevant key set).

> **API note:** The runtime world state class is `WorldStatesRegistry` (static). Access any category with `WorldStatesRegistry.GetStates("categoryName")["key"]`.

***

## Writing from Action Effects

Set **Effects** or **World Effects** on an action in the Inspector. The behavior applies them automatically when the action completes — no code needed. Choose the **Mode** (`Set` / `Add` / `Minus`) to control how the value is applied.

***

## Writing from Code in Actions

```csharp
public override bool PostPerform()
{
    // Direct write from action code.
    WorldStatesRegistry.GetStates("shop")["counterOpen"] = 0;
    return true;
}
```


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