Player-session MUD protocol
MCCPX
MUD Client Compression Protocol Extensions
Experimental / unproven
Not in common current use
A draft for independently negotiated bidirectional compression using zstd, deflate, or no compression.
Protocol overview
- First seen
- 2025
- Present-day status
- Experimental / unproven
- In use today?
- No common current use was verified.
- Legacy?
- No.
- Layer
- Player-session MUD protocol
- Transport
- Draft Telnet option 88 with negotiated codecs
- Telnet option
- 88
- Research validated
Current use and fit
An experimental 2025 draft whose stated draft lifetime ended in March 2026; it is not a production baseline.
Implementation essentials
- Negotiate each direction and codec explicitly.
- Do not stack MCCPX with MCCP2 or MCCP3.
- Require an explicit compatibility target before implementation.
Compatibility and safety notes
- The specification remains a work in progress.
- Compression is not a security mechanism.
- Deployment interoperability is not established.
Original specifications and sources
- MUD Standards draft Draft
Where an original site has disappeared, a preservation archive is linked and identified as such. MUDVerse does not claim authorship of the original protocol.