---
url: >-
  https://adk.nht.io/api/@nhtio/adk/types/type-aliases/RetrievableBytesStoreFn.md
description: >-
  Persists extracted retrievable text bytes into consumer storage and returns a
  {@link @nhtio/adk!SpoolReader}. A byte-persistence conduit, not a mutation.
---

# Type Alias: RetrievableBytesStoreFn

```ts
type RetrievableBytesStoreFn = (
  ctx: TurnContext,
  id: string,
  bytes: ConduitBytes,
) => SpoolReader | Promise<SpoolReader>;
```

Defined in: [lib/contracts/turn\_runner\_context.ts:233](https://github.com/NHTIO/ADK/blob/v1.20260605.0/src/lib/contracts/turn_runner_context.ts#L233)

Persists extracted retrievable text bytes into consumer storage and returns a
[@nhtio/adk!SpoolReader](../../spooled_artifact/interfaces/SpoolReader.md). A byte-persistence conduit, not a mutation.

## Parameters

| Parameter | Type                                          |
| --------- | --------------------------------------------- |
| `ctx`     | [`TurnContext`](../interfaces/TurnContext.md) |
| `id`      | `string`                                      |
| `bytes`   | [`ConduitBytes`](ConduitBytes.md)             |

## Returns

| [`SpoolReader`](../../spooled_artifact/interfaces/SpoolReader.md)
| `Promise`<[`SpoolReader`](../../spooled_artifact/interfaces/SpoolReader.md)>