# IRCv3 capabilities

echoIRCd implements a broad set of IRCv3 capabilities. Clients negotiate them with `CAP LS` and
`CAP REQ`.

## Advertised capabilities

```text
server-time        message-tags          account-tag          account-notify
extended-join      chghost               multi-prefix         away-notify
invite-notify      setname               echo-message         userhost-in-names
batch              labeled-response      standard-replies     extended-monitor
draft/chathistory  draft/event-playback  draft/message-redaction
draft/multiline    draft/metadata-2      draft/read-marker    draft/webpush
draft/account-registration               sts
```

## Notable features

- **CHATHISTORY** — replay recent conversation, with server-side storage.
- **labeled-response** + **batch** — correlate replies to the command that caused them.
- **multiline** — send a message that spans lines as a single logical message.
- **STS** — advertise a strict-transport-security policy so clients upgrade to TLS.
- **draft/webpush** — RFC 8291 / 8292 Web Push notifications for supporting clients.

## SASL

SASL is a capability too — see [Accounts & SASL](/docs/accounts) for the supported mechanisms.