Echo Protocol

Echo Protocol 0.5.0-beta.2 — Minecraft 1.21.11

Compatibility port of Echo Protocol 0.5.0-beta.2 — The House Remembers to Minecraft 1.21.11.

Gameplay content remains equivalent to the original 0.5.0-beta.2 release.

Changes

• Added full compatibility with Minecraft 1.21.11.
• Updated Yarn mappings and Fabric dependencies.
• Migrated command permission handling to the Minecraft 1.21.11 API.
• Updated Echo rendering to use the current translucent entity render layer.
• Fixed player skin caching so temporary fallback skins are not permanently cached.
• Preserved the render-state based Echo renderer.
• Preserved classic and slim player skin models.
• Preserved the stable UUID tracked-data codec.
• Preserved multiplayer privacy and server-side entity tracking.
• Preserved the existing persistent memory schema and configuration format.
• No gameplay systems were removed or simplified.

Verified gameplay systems

• Memory Echo
• Corrupted Echo
• Mimic Echo
• False Memories
• Contradictory Memories
• Panic Imprints
• Peripheral Echo
• Audio Residue
• Borrowed Habits
• Familiar Locations
• Room Memory Graph
• Memory Threads
• Memory Contamination
• Observation Profile
• The Original
• Intensity presets
• Persistent memory

Verification

• 50 automated tests: Passed
• Clean production build: Passed
• Dedicated Fabric server: Verified
• Real Fabric client: Verified
• Full representative gameplay pipeline: Verified
• Echo renderer and player skins: Verified
• Restart persistence: Verified
• Two-client multiplayer privacy: Verified
• shared_echoes=false: private Echoes remained private
• shared_echoes=true: intended shared Echo visibility verified
• No critical runtime errors detected
• No Echo entity leaks detected
• No packet spam detected
• No "Can't keep up" issues detected during verification

Requirements

• Minecraft Java Edition 1.21.11
• Fabric Loader 0.19.3+
• Fabric API
• Java 21
• Install on both client and server for multiplayer