# Latitude Player Facing Invariants > Authoritative “promise of Latitude” rules. Encodes the non-negotiable player-facing behaviors (climate continuity, band logic, no warm-band snow, intuitive exploration). Prevents technically-correct changes that break the mod’s feel. Use when this capability is needed. - Skill: `tomevault-io/latitude-player-facing-invariants` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/latitude-player-facing-invariants` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/latitude-player-facing-invariants/raw - Safety review: pending (external: skill-scanner PASS, skillspector PASS) - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Coding & Dev Tools - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/latitude-player-facing-invariants --- # Latitude — Player-Facing Invariants (Authoritative) This skill encodes the *promise* of Latitude to players. Any change that violates these invariants is a regression, even if it compiles. --- ## Core promise Latitude turns Minecraft’s overworld into a planet-like climate experience: - climate changes meaningfully with north/south travel - bands feel continuous and intentional - exploration “makes sense” without reading a wiki --- ## Non-negotiable invariants ### 1) Warm-band snow must be impossible In warm bands (equator/tropical/subtropical as defined by the mod): - No `snow_block` - No `snow` layers - No `powder_snow` - No “frozen top layer” behavior If any of these appear, it is a bug. Fix must use write-path guards or feature cancels, not biome reassignment. ### 2) Climate continuity over patchiness - Bands should feel continuous across distance. - “Islands” of totally wrong climate should be treated as bugs unless explicitly designed (and documented). ### 3) Distance must correlate with temperature - Moving north/south changes temperature/biomes in a predictable direction. - Any system that causes temperature to decorrelate from latitude needs strong justification. ### 4) All vanilla biomes still exist - Unless explicitly excluded by the biome authority table, every vanilla biome must remain obtainable somewhere. - Fixing a bug by effectively deleting a biome is forbidden. ### 5) The mod must be playable without debug knowledge - Default gameplay should not require JVM flags. - Debug features must not leak into normal play (no auto-open screens, no actionbar spam). ### 6) “Surprises” require communication If the mod introduces hazards/effects (storms, polar danger, etc.): - players must receive clear in-game feedback (HUD text, warning, particles, etc.) - avoid silent punishment --- ## Required assistant behavior When proposing changes, the assistant must state: - which invariants are affected - whether the change preserves them - how to test the invariants quickly (minimal proof steps) --- ## Forbidden changes - Adjusting biome bands to hide symptoms - Shipping with debug toggles enabled by default - Removing access to vanilla biomes because they are “problematic” - Making climate feel random/patchy to “increase variety” --- > Converted and distributed by [TomeVault](https://tomevault.io/claim/joolbits) — claim your Tome and manage your conversions.