I came across an interesting NIPS protocol that discusses how clients should handle mentions in their messages. The protocol states that clients must display an autocomplete component for mentions so that users can easily identify them and add them to their message. Once a mention is identified, it should be added to the `.tags` field of the message along with its pubkey or event ID. This allows other clients to easily find the original mention when they receive the message.

The protocol also outlines how clients should handle mentions in their messages. When a client receives a `text_note` event with `#[index]` mentions in the `.content`, they should perform a search-and-replace using the actual contents from the `.tags`. This ensures that the mentions are properly formatted and linked to their corresponding tags.

Overall, this NIPS protocol provides a clear and concise guide for handling mentions in messages, making it easier for users to communicate and collaborate on projects.