Individual skill
unity-grid-puzzle-effects
Implement composable Unity grid puzzle effects such as movement arrows, ice counters, cell barriers, and booster restrictions using typed metadata, per-attempt state, shared rule hooks, and semantic board events. Use when extending a grid puzzle without putting effect logic in input or views.
plugins/agent-foundry/skills/unity-grid-puzzle-effects/SKILL.md
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# Unity Grid Puzzle Effects
Use `unity-cli` and `unity-game-dev` for the project's operating contract.
Inspect its board predicates, commands, effect schema and tests. Read
[the composition recipe](references/mechanics.md) before adding a module.
Use `unity-grid-drag-puzzle` only when building or changing its movement system.
## Define support and behavior
Separate authored validity, registered modules and runtime support. A schema
entry or editor icon does not prove that a mechanic is playable. The source
recipe demonstrates Arrow and Ice behavior; Barrier is an extension design
whose runtime support must be implemented and verified before it is enabled.
Reject unsupported playback explicitly.