# Deprecated: field set columns

> get_pack_details: deprecated; use list_field_sets instead.

Source: https://emailmovers.com/mydatahub/docs/reference/mcp/get_pack_details

> **Deprecated.** `get_pack_details` stays available for 12 months from the v2 launch, with 3 emailed notices, then it stops working. Use [`list_field_sets`](https://emailmovers.com/mydatahub/docs/reference/mcp/list_field_sets.md) instead.

Deprecated: lists the columns of one field bundle. Use list_field_sets instead. list_field_sets returns every field set with its exact columns and credits per record. It stops working 12 months after the new tools launch, after three emailed notices; https://emailmovers.com/mydatahub/docs/migrate maps every call. Lawful basis is UK GDPR Article 6(1)(f) legitimate interests; email audiences include corporate subscribers only by default (PECR), so sole traders and ordinary partnerships are left out unless the toggle is changed.

| Property | Value |
| --- | --- |
| Tool name | `get_pack_details` |
| Replaced by | [`list_field_sets`](https://emailmovers.com/mydatahub/docs/reference/mcp/list_field_sets.md) |
| What changes | list_field_sets returns every field set with its exact columns and credits per record. |
| Annotations | readOnlyHint true, destructiveHint false, idempotentHint true, openWorldHint false |
| Input and output | The old shapes, unchanged during the deprecation window. The schemas are open objects. |

The [migration guide](https://emailmovers.com/mydatahub/docs/migrate.md) maps every old call to its replacement, with before and after examples.