Client Capabilities

Revision 0.10

Red denotes a conflicting token definition, gray for deprecated (however quite possibly still in use), yellow for proposed, and blue for OK.

Name	Format	Comments
account-notify	account-notify	Notifies clients when other clients in common channels authenticate with or deauthenticate from their account (e.g. NickServ, SASL).
account-tag	account-tag	Attaches a tag containing the user’s account to every message they send.
away-notify	away-notify	Notifies clients when other clients in common channels go away or come back (replacing the traditional method of clients polling the server for changes).
batch	batch	Lets the server bundle common messages together, which lets clients be more intelligent about displaying and processing them. i.e., netsplits and netjoins, chat history, etc.
cap-notify	cap-notify	Notifies clients when client capabilities become available or are no longer available. Implicitly enabled with `CAP LS 302` or higher.
chghost	chghost	Enables the `CHGHOST` message, which lets servers notify clients when another client’s username and/or hostname changes.
echo-message	echo-message	Notifies clients when their `PRIVMSG` and `NOTICE`s are correctly received by the server. Will be more useful for general clients when the IRCv3 WG standardizes their `id` tag to let clients track these messages properly.
extended-join	extended-join	Extends the `JOIN` message to include the account name of the joining client. Used in conjunction with the `account-*` caps to let clients track account information better. Also see account-notify.
inspircd.org/replay-message	inspircd.org/replay-message	Functionally equivalent to `echo-message`. Use `echo-message` rather than this capability. Also see echo-message.
invite-notify	invite-notify	Notifies clients when other clients are invited to common channels. The notify messages are generally only sent to privileged channel members.
metadata	metadata	Lets clients store metadata about themselves with the server, for other clients to request and retrieve later.
monitor	monitor	Indicates support for the `MONITOR` command, which lets users request notifications for when clients become online / offline.
multi-prefix	multi-prefix	Makes the server send all prefixes in `NAMES` and `WHO` output, in order of rank from highest to lowest. Replaces the `UHNAMES` token for `RPL_ISUPPORT`.
sasl	sasl[=mechanism{,mechanism}] Examples: sasl sasl=PLAIN sasl=EXTERNAL,FOO,DH-AES,BAR,DH-BLOWFISH,FOOBAR,PLAIN	Indicates support for SASL authentication, a standardized way for clients to identify for an account. Replaces the `NICKSERV IDENTIFY` command / private message and lets IRC clients build better interfaces for account auth.
server-time	server-time	Lets clients show the actual time messages were received by the server. Facilitates things like IRC history playback by bouncers.
tls	tls	Indicates support for the `STARTTLS` command, which lets clients upgrade their connection to use SSL/TLS rather than plaintext.
twitch.tv/commands	twitch.tv/commands	Used by Twitch.tv to enable the `USERSTATE`, `GLOBALSTATE`, `ROOMSTATE`, `HOSTTARGET`, `NOTICE`, and `CLEARCHAT` messages, as well as the `msg-id` tag.
twitch.tv/membership	twitch.tv/membership	Used by Twitch.tv to enable the `NAMES`, `JOIN`, `PART`, and `MODE` channel membership and state messages.
twitch.tv/tags	twitch.tv/tags	Used by Twitch.tv to enable custom tags on the `PRIVMSG`, `USERSTATE`, `NOTICE`, and `GLOBALUSERSTATE` messages.
userhost-in-names	userhost-in-names	Extends the `RPL_NAMREPLY` message to contain the full nickmask `(nick!user@host)` of every user, rather than just the nickname.
znc.in/self-message	znc.in/self-message	Used by ZNC to make sure all connected sessions receive copies of private messages sent by other sessions. Also see echo-message.