# Contextual Compression Retriever - Workflow node | Docs - nodulz

Source: https://nodulz.com/docs/nodes/ai_contextual_compression_retriever

Language: en

Compress retrieved chunks with an LLM

## Usage and specifics

With a model credential, this node compresses retrieved passages according to query. Without a usable credential, it uses keyword matching. Supply chunksSource and set topK.

Technical type : `ai_contextual_compression_retriever`. Runtime : `nodulz`.

## Credentials and prerequisites

- [Create and configure the credential : ai-model](/docs/credentials/ai-model)

Create credentials in your nodulz instance’s Credentials area, then select them on the node. Availability depends on ownership and sharing. See the [credentials guide](/docs/credentials) for access and rotation.

## Parameters

Names below are technical keys. Defaults are not a ready-to-run configuration: complete fields required by your operation. Paths containing [] describe list items; some fields depend on the selected mode.

| Parameter | Type | Default | Values / limits |
| --- | --- | --- | --- |
| `query` | `string` | `""` | - |
| `topK` | `number` | `4` | -; ≥ 1, ≤ 1000 |
| `searchMode` | `enum` | `"vector"` | `vector`, `hybrid` |
| `candidateK` | `number` | `20` | -; ≥ 1, ≤ 1000 |
| `rerank` | `boolean` | `false` | - |
| `chunksSource` | `string` | `""` | - |
| `vectorsSource` | `string` | `""` | - |
| `documentsSource` | `string` | `""` | - |
| `credentialId` | `string` | - | - |
| `model` | `string` | `""` | - |
| `workflowId` | `string` | `""` | - |

## Initial configuration

Initial catalog configuration example, to adapt before running. Keep secrets in credentials.

```json
{
  "query": "",
  "topK": 4,
  "searchMode": "vector",
  "candidateK": 20,
  "rerank": false,
  "chunksSource": "",
  "vectorsSource": "",
  "documentsSource": "",
  "model": "",
  "workflowId": ""
}
```

## Verification

Test with representative data. Check node output in the inspector and logs, then use editor mapping for downstream fields. A trigger test with a simulated payload does not validate external service delivery.

See also : [Expressions and data](/docs/expressions), [Executions](/docs/executions), [Node catalog](/docs/nodes).

## Explore further

- [Features - nodulz](https://nodulz.com/product/overview)
- [Node catalog - nodulz](https://nodulz.com/product/catalog)
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- [Pricing - nodulz](https://nodulz.com/pricing)
- [Use cases and workflow automation - nodulz](https://nodulz.com/use-cases)
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- [Documentation - nodulz](https://nodulz.com/docs)