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

# Add or Remove a Reaction

> Add or remove an emoji reaction on a message.

The **Add or Remove a Reaction** block lives in the **Messages** palette category. Add or remove an emoji reaction on a message.

## What it does

Adds or removes an emoji reaction on a message.

## Configuration

Open the block in the builder sidebar to configure these fields.

### `action`

**Type:** `string`. Required.

Accepted values: `add`, `remove`.

### `emoji`

**Type:** `string`. Required.

Unicode emoji or custom emoji syntax.

### `message_id`

**Type:** `block-reference`. Required.

Target message.

## See also

* [Messages](/builder/action-blocks/messages) — Browse all blocks in the Messages category.