# Custom Reference Data

By default the reference data tools read from the bundled OneTick Cloud coverage files. On-prem and custom deployments can replace these by pointing `CSV_DATA_PATH` at a directory containing their own files.

```
CSV_DATA_PATH=/path/to/your/reference-data/
```

#### IMPORTANT
The configured directory **fully replaces** the default — there is no merging. All 7 files must be present or the corresponding tools return empty results.

No server restart is required — changes to files in `CSV_DATA_PATH` take effect on the next request.

## Setup checklist

1. Create a directory containing all 7 files listed in `Data source`.
2. Use the exact filenames — the MCP server discovers each tool by looking for its corresponding filename in `CSV_DATA_PATH`.
3. Use tab-separated format with a header row — see `File schemas` for required columns and examples.
4. Set `CSV_DATA_PATH` to your directory path.
5. Verify by starting the server and calling `list_databases` — it should return your databases.

See `Reference Data Tools` for the full file mapping, required columns, and example rows for each file.