# Compare members

Source: https://neondeerdata.com/docs/platform/automations/steps/compare-members/

Step · Compare

Compares two sets of workspace members: only in A, only in B, or in both.

## Inputs

| Label | Key                | Type              | Required | Notes |
| ----- | ------------------ | ----------------- | -------- | ----- |
| Set A | `previous_members` | Workspace members | No       |       |
| Set B | `new_members`      | Workspace members | No       |       |

## Outputs

| Label       | Key         | Type                  | Always set | Notes                                                            |
| ----------- | ----------- | --------------------- | ---------- | ---------------------------------------------------------------- |
| Only in B   | `added`     | Group: Count, Members | Yes        | `added.count`, `added.members` (list of actors)                  |
| Only in A   | `removed`   | Group: Count, Members | Yes        | `removed.count`, `removed.members`                               |
| Differences | `changed`   | Group: Count, Members | Yes        | Items in A or B but not both. `changed.count`, `changed.members` |
| In both     | `unchanged` | Group: Count, Members | Yes        | `unchanged.count`, `unchanged.members`                           |

## How it behaves

- Set comparison on the member ID (trimmed, lowercased). Duplicates count once; order is ignored.
- Always takes the single outcome, even when nothing differs.

## Errors

Fails when

- Neither Set A nor Set B is wired. Wire at least one set.
- Either set contains an actor that is not a workspace member, such as an API token, system, app or workflow. Wire workspace members only.
- No wired entry can be read as a workspace member. The step fails rather than report no changes; check the variables wired into the sets.

For errors that every step can return, see [Troubleshooting](https://neondeerdata.com/docs/platform/automations/troubleshooting/).

## Example

Work out who was added to and removed from a task, using Task assignee changed outputs.

**Example inputs**

| Input | Value                 |
| ----- | --------------------- |
| Set A | Maya Chen, Sam Ortiz  |
| Set B | Sam Ortiz, Priya Shah |

**Example outputs**

| Output      | Value                          |
| ----------- | ------------------------------ |
| Only in B   | Count 1: Priya Shah            |
| Only in A   | Count 1: Maya Chen             |
| Differences | Count 2: Maya Chen, Priya Shah |
| In both     | Count 1: Sam Ortiz             |