https://discord.com/developers/docs/topics/gateway-events#thread-create
Extends
APIThreadChannelThe IDs of the set of tags that have been applied to a thread in a thread-only channel
The id of the guild (may be missing for some channel objects received over gateway guild dispatches)
The approximate member count of the thread, does not count above 50 even if there are more members
The client users member for the thread, only included in select endpoints
Number of messages (not including the initial message or deleted messages) in a thread
If the thread was created before July 1, 2022, it stops counting at 50 messages
The name of the channel (1-100 characters)
Whether the channel is nsfw
ID of the thread creator
ID of the parent category for a channel (each parent category can contain up to 50 channels)
OR
ID of the parent channel for a thread
Explicit permission overwrites for members and roles
See https://discord.com/developers/docs/resources/channel#overwrite-object
Sorting position of the channel
The metadata for a thread channel not shared by other channels
Number of messages ever sent in a thread
Similar to
message_count on message creation, but won't decrement when a message is deleted