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docs/IRCV3_FEATURES.md

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+# TechIRCd IRCv3 Features
+
+## ✅ Implemented IRCv3 Features
+
+### Core Capability Negotiation
+- **CAP LS** - List available capabilities
+- **CAP LIST** - List enabled capabilities  
+- **CAP REQ** - Request capabilities
+- **CAP ACK/NAK** - Acknowledge/reject capability requests
+- **CAP END** - End capability negotiation
+
+### Supported Capabilities
+
+#### IRCv3.1 Base
+- ✅ **sasl** - SASL authentication (PLAIN mechanism)
+- ✅ **multi-prefix** - Multiple channel prefixes (~@%+)
+- ✅ **away-notify** - Away state change notifications
+- ✅ **account-notify** - Account login/logout notifications 
+- ✅ **extended-join** - JOIN with account and real name
+
+#### IRCv3.2 Extensions  
+- ✅ **server-time** - Timestamp tags on messages
+- ✅ **userhost-in-names** - Full hostmasks in NAMES
+- ✅ **monitor-notify** - MONITOR command for presence
+- ✅ **account-tag** - Account tags on messages
+- ✅ **message-tags** - IRCv3 message tag framework
+
+#### IRCv3.3 Features
+- ✅ **echo-message** - Echo sent messages back to sender
+- ✅ **chghost** - Host change notifications
+- ✅ **invite-notify** - Channel invite notifications
+- ✅ **batch** - Message batching support
+
+## 🚀 Usage Examples
+
+### Basic Capability Negotiation
+```
+Client: CAP LS 302
+Server: :server CAP * LS :account-notify away-notify extended-join multi-prefix sasl server-time userhost-in-names account-tag message-tags echo-message batch chghost invite-notify monitor-notify
+
+Client: CAP REQ :server-time message-tags sasl
+Server: :server CAP * ACK :server-time message-tags sasl
+
+Client: CAP END
+```
+
+### SASL Authentication
+```
+Client: CAP REQ :sasl
+Server: :server CAP * ACK :sasl
+Client: AUTHENTICATE PLAIN
+Server: AUTHENTICATE +
+Client: AUTHENTICATE dXNlcm5hbWU6cGFzc3dvcmQ=
+Server: :server 903 * :SASL authentication successful
+Client: CAP END
+```
+
+### Server-Time Tags
+```
+@time=2025-08-28T17:01:49.123Z :nick!user@host PRIVMSG #channel :Hello!
+```
+
+### Account Tags
+```
+@account=alice;time=2025-08-28T17:01:49.123Z :alice!user@host PRIVMSG #channel :Hello!
+```
+
+### Extended JOIN
+```
+:nick!user@host JOIN #channel alice :Real Name
+```
+
+### MONITOR Command
+```
+Client: MONITOR + alice,bob,charlie
+Server: :server 730 nick :alice,bob
+Server: :server 731 nick :charlie
+
+Client: MONITOR L
+Server: :server 732 nick :alice,bob,charlie
+Server: :server 733 nick :End of MONITOR list
+```
+
+## 🔧 Configuration
+
+IRCv3 features are automatically available when clients request them through CAP negotiation. No special server configuration required.
+
+### SASL Accounts
+Currently supports simple username/password authentication. Edit the `authenticateUser()` function in `commands.go` to integrate with your authentication system.
+
+## 🎯 Advanced Features
+
+### Message Tags
+TechIRCd automatically adds appropriate tags based on client capabilities:
+- `time` - Server timestamp (if server-time enabled)
+- `account` - User account name (if logged in and account-tag enabled)
+
+### Multi-Prefix Support
+Shows all user channel modes: `~@%+nick` for Owner/Op/Halfop/Voice
+
+### Echo Message
+When enabled, clients receive copies of their own messages, useful for multi-device synchronization.
+
+## 🔮 Future IRCv3 Extensions
+
+Planned for future releases:
+- **draft/chathistory** - Message history replay
+- **draft/resume** - Connection state resumption  
+- **labeled-response** - Request/response correlation
+- **standard-replies** - Standardized error responses
+
+## 💡 Client Compatibility
+
+TechIRCd's IRCv3 implementation is compatible with:
+- **HexChat** - Full feature support
+- **IRCCloud** - Full feature support  
+- **Textual** - Full feature support
+- **WeeChat** - Full feature support
+- **KiwiIRC** - Full feature support
+- **IRCv3-compliant bots** - Full API support
+
+Legacy IRC clients without IRCv3 support continue to work normally without any IRCv3 features.