---
title: "How to test knowledge base retrieval"
description: "Enter a test query in Fast Line Pro and see which chunks retrieval finds — with score and text."
---

# How to test knowledge base retrieval

Check which chunks a Fast Line Pro knowledge base finds for your query — without external tools.

## When you need this

- Before launching an agent, confirm the knowledge base returns the right chunks.
- A client reports the bot “cannot find an answer” — see whether retrieval or the scenario is the issue.
- After changing chunks, chunking, or search settings — verify the outcome.

## What to know

- The screen is **Search check** (UI label may match your locale) — retrieval diagnostics, not a live agent chat test.
- Queries are **up to 250 characters**; empty or too-long queries are not submitted.
- The check uses the **saved search settings** for this knowledge base. You cannot override them on this screen.
- Results list chunks with **score**, document, position, and text. An empty list means nothing matched.
- A long-running check may show a timeout hint — try a shorter query or retry later.

## Before you start

- [ ] Open **Fast Line Pro** → the **knowledge base** → **documents** list.
- [ ] The base has indexed documents and chunks.
- [ ] You have Fast Line Pro view rights.

## Steps

### 1. Open search check

1. On the documents page, click **Search check** (also available from **Knowledge base settings**).
2. The query form opens.

### 2. Enter a query and run

1. Type a typical customer question that should match a chunk.
2. Confirm the hint says the query is ready (≤250 characters).
3. Click **Check** / **Verify**.

### 3. Review results

1. Check **Chunks found**.
2. Each row shows **score**, document name, **position**, and text (expand with **Show full text**).
3. If nothing is found — adjust the query, review search settings, or check document content.

## What happens next

The check does not change the knowledge base or live dialogs — read-only diagnostics only.

## How to verify

- For an expected query, relevant chunks appear with reasonable scores.
- Edit a chunk in the base → run the check again — result text reflects the change (after indexing).

## Other options

- **Agent reply in a scenario** — [Check agent response](/en/fastlinepro/how-to/check-agent-response.md) (keyword checks in scenarios, not retrieval).
- **Bulk chunk edits** — [Export and import chunks](/en/fastlinepro/how-to/export-import-kb-chunks.md).

## Related

- [Fast Line Pro interface](/en/fastlinepro/explanation/fastline-pro-interface.md)
- [Configure chunking](/en/fastlinepro/how-to/configure-chunking.md)
- [Integrator hub](/en/fastlinepro/integrator-hub.md)