Changelog

0.0.6 — 2026-10-14

Added

• Added live Horizontal Mirror and Vertical Mirror modifiers to the Builder's Multitool in Building and Exchanging profiles on Forge 1.20.1, NeoForge 1.21.1, and NeoForge 26.1.2.
• Added a shared, Minecraft-independent operation-planner foundation for future composable modifiers such as Array and Radial Mirror.
• Added server-authoritative live-mirror toggles to the Multitool radial menu with explicit enabled/disabled feedback.
• Added cross-version contracts covering planner wiring, UI exposure, server authority, bounded plans, translations, and the intentional legacy feature gate.

Changed

• Build/Exchange live mirroring transforms the same upstream candidate list used by preview and execution, keeping hologram and placement geometry in lockstep.
• Horizontal mirroring follows the player's facing axis; vertical mirroring reflects around the active operation anchor. Directional block states are mirrored per generated copy instead of only moving coordinates.
• Live modifier state is isolated with the active Multitool virtual-gadget profile, consistent with the Multitool's existing per-profile settings model.
• Duplicate positions are resolved deterministically and interactive plans are capped at 65,536 positions. Overflow or an oversized transformed plan fails closed to the original upstream operation instead of partially applying a modifier.
• Reused the existing mirror network action contextually rather than adding a second mirror protocol. Forge 1.20.1 and both NeoForge ports bump their addon protocol versions so mixed 0.0.5/0.0.6 peers cannot misinterpret a live-mirror request as a template mutation.

Compatibility

• Minecraft 1.16.5 remains fully supported by the 0.0.6 artifact, but live Build/Exchange mirroring is intentionally not exposed on that port yet. Legacy Building Gadgets represents its build plan as positions plus one shared block state, so a coordinate-only implementation would render/place directional blocks such as stairs incorrectly after mirroring. The feature stays gated until the legacy adapter can preserve per-position transformed block states.
• Existing Copy/Paste and Cut/Paste template mirroring remains unchanged on every supported port.

Retained limits

• Native structure imports retain the default 100,000-position bounding volume and require Copy/Paste Paste mode. The configurable million-position copy maximum and bounded preview transport from 0.0.5 are unchanged.