# Migrate Hot Chocolate Fusion from 16.6 to 16.7 - Fusion

> Migration guide for Hot Chocolate Fusion v16.6 to v16.7: replace raw condition masks with ConditionFlags and configure wide operation limits.

Canonical source: https://chillicream.com/docs/fusion/migration/migrate-from-16-6-to-16-7

Update every Hot Chocolate Fusion package in the application to version 16.7 before applying these changes.

## Deprecations

### Raw condition masks replaced by ConditionFlags

Fusion can now compile and execute operations with more than 64 distinct `@skip`/`@include` conditions or `@defer` conditions. `MaxAllowedIncludeConditions` limits the combined `@skip` and `@include` conditions, and `MaxAllowedDeferConditions` limits the `@defer` conditions. Both limits default to **1,024**. An operation that exceeds either limit produces a GraphQL request error during operation compilation.

Configure the limits through `FusionRequestOptions` on the gateway:

C#

```
builder.Services
    .AddGraphQLGatewayServer()
    .ModifyRequestOptions(options =>
    {
        options.MaxAllowedIncludeConditions = 2_048;
        options.MaxAllowedDeferConditions = 2_048;
    });
```

`ConditionFlags` contains the first 64 evaluated conditions and any remaining conditions. Pass the condition carriers from `OperationPlanContext` to the Fusion `Selection` overloads:

Diff

```
- bool included = selection.IsIncluded(context.IncludeFlags);
- bool deferred = selection.IsDeferred(context.DeferFlags);
+ bool included = selection.IsIncluded(context.IncludeConditionFlags);
+ bool deferred = selection.IsDeferred(context.DeferConditionFlags);
```

Replace every deprecated Fusion `Selection` overload as follows:

| Deprecated 16.6 member                                 | 16.7 replacement                                                |
| ------------------------------------------------------ | --------------------------------------------------------------- |
| Selection.IsIncluded(ulong)                            | Selection.IsIncluded(ConditionFlags)                            |
| Selection.IsDeferred(ulong)                            | Selection.IsDeferred(ConditionFlags)                            |
| Selection.GetActiveDeliveryGroups(ulong)               | Selection.GetActiveDeliveryGroups(ConditionFlags)               |
| Selection.HasActiveDeliveryGroup(ulong, DeliveryGroup) | Selection.HasActiveDeliveryGroup(ConditionFlags, DeliveryGroup) |

The deprecated raw overloads continue to work for operations with at most 64 conditions. When an operation has more than 64 conditions of the corresponding kind, the deprecated raw inclusion overloads throw `InvalidOperationException` for every conditional selection and the deprecated raw defer overloads throw for every deferrable selection, including selections whose own conditions are all among the first 64; raw inclusion evaluation does not throw for an unconditional selection, and raw defer evaluation does not throw for a non-deferrable selection. Releases before 16.7 rejected operations with more than 64 conditions during compilation.

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Maintained by ChilliCream. Last updated on **September 01, 2026** by **Michael Staib**