> ## Documentation Index
> Fetch the complete documentation index at: https://docs.zylon.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Tabular Analysis tool

> Analyze ingested tabular artifacts during a message.

Use Tabular Analysis when you want the assistant to perform calculations over tabular data (CSV, TSV, or tables extracted from documents).

## Prerequisites

* An API token. See [Backoffice Developer Console](/en/developer-manual/get-started/developer-console).
* Ingested tabular artifacts to analyze.

## Requirements

* Tool spec: `{ "name": "tabular_analysis", "type": "tabular_analysis_v1" }`
* `tool_context`: at least one `ingested_artifact` with a `context_filter`

## Basic request and response

This example validates a request that enables tabular analysis over a collection:

```bash theme={null}
curl -X POST "https://{BASE_URL}/api/gpt/v1/messages/validate" \
  -H "Authorization: Bearer {API_TOKEN}" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "default",
    "max_tokens": 128,
    "messages": [
      { "role": "user", "content": "What is the average of the Q1 revenue column?" }
    ],
    "tools": [
      { "name": "tabular_analysis", "type": "tabular_analysis_v1" }
    ],
    "tool_choice": { "type": "auto" },
    "tool_context": [
      {
        "type": "ingested_artifact",
        "context_filter": {
          "collection": "{collectionID}"
        }
      }
    ]
  }'
```

Example response:

```json theme={null}
{ "valid": true, "errors": null }
```

To run the request, send the same body to `POST /messages`.

## Tips

* Ensure the artifact content is a clean table (CSV/TSV is best).
* Keep the table small enough for quick analysis.

## Next steps

* Ingest and manage artifacts: [Artifacts](/en/developer-manual/build-with-zylon/working-with-artifacts)
* Learn how messages return tool blocks: [Messages](/en/developer-manual/build-with-zylon/working-with-messages)