---
title: "Action fastline_search"
description: "Searches the Fast Line knowledge base without generating an AI response."
---

# Action `fastline_search`

> **System ID:** `action_fastline_search`

## Description

**Fast Line:** vector search in the knowledge base only — without AI text generation. Stores the best answer in a constant (`fastline_search_best_result` or `save_response`), and the full list in `fastline_search_result`.

## Events (scenario branches)

| Event | When it occurs |
|-------|----------------|
| **success** | Search completed (result may be empty) |
| **error** | No text to search |

## Parameters

| Parameter | Type | Required | Default | Description |
|-----------|------|----------|---------|-------------|
| `user_input` | string | no | `null` | Question; otherwise — `fastline_search_request` or message text |
| `bot_id` | string / number | no | current bot | Bot to search |
| `provider` | string | no | `null` | Provider for vectorization |
| `model` | string | no | `null` | Vectorization model |
| `apiKey` | string | no | `null` | Key (also `openai_token`) |
| `customConfig` | object | no | `null` | Additional search configuration |
| `limit` | number | no | `null` | Maximum results |
| `category` | string | no | `null` | Category filter |
| `max_distance` | number | no | `null` | Distance threshold |
| `save_response` | string | no | `"fastline_search_best_result"` | Constant for the best answer |

## Configuration example

```json
{
  "user_input": "{{user_question}}",
  "category": "support",
  "max_distance": 0.3,
  "limit": 5,
  "save_response": "best_answer"
}
```

## Related docs

- [Actions reference](/en/actionjail/reference/actions-reference.md)