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UpdatedApril 30, 2026 at 15:29

General Unity development reference for Valkur — MCP workflow, console verification, project conventions (assemblies, layers, sorting), domain-reload safety, ServiceLocator, ScriptableObjects, ObjectPool, Cinemachine, URP 2D, Tilemap, UI, performance, gotchas. Load whenever writing or refactoring C# under `unity/Valkur/Assets/_Project/Scripts/`.

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SKILL.md

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name	unity-development
description	General Unity development reference for Valkur — MCP workflow, console verification, project conventions (assemblies, layers, sorting), domain-reload safety, ServiceLocator, ScriptableObjects, ObjectPool, Cinemachine, URP 2D, Tilemap, UI, performance, gotchas. Load whenever writing or refactoring C# under `unity/Valkur/Assets/_Project/Scripts/`.

Unity Development for Valkur

The full canonical knowledge base lives at:

.github/skills/unity-development/SKILL.md (~540 lines, 20 sections)

Read it directly with the Read tool when you need any of:

Need	Section
MCP for Unity workflow (resources vs tools, post-edit verification, payload sizing, multi-instance)	§1
Project conventions (assembly placement, code style)	§2
Domain-reload safety pattern (mandatory for static state)	§3
ServiceLocator / SingletonMonoBehaviour / ScriptableObject / ObjectPool	§4
Physics & layers (the 8 layers + 2D physics tips)	§5
Sorting layers (depth order, the 14-layer chain)	§6
Cinemachine & camera (DetachFollow pattern)	§7
Input (legacy + New Input System; `GameEditorManager.AnyEditorActive`)	§8
URP 2D specifics (`endCameraRendering`, Light2D, Sprite-Lit-Default trap)	§9
UI conventions (uGUI, mouse+keyboard parity, modal patterns)	§10
Tilemap (Grid, TilemapCollider2D + CompositeCollider2D)	§11
Performance cheatsheet (anti-patterns → fixes)	§12
Testing (EditMode / PlayMode / CLI / parity)	§13
Editor extensions (Custom Inspector, MenuItem, PropertyDrawer, Gizmos)	§14
Common gotchas table (the pit traps)	§15
Hot reload workflow	§16
Saving & persistence (`ISaveService`, `SaveSchemaMigrator`)	§17
Audio (`IAudioService`, `AudioCatalog`, mixer routing)	§18
Migration-specific rules (unit conversions table)	§19
Quick MCP recipes (component add, hierarchy read, run menu item, asset search)	§20

Closing reminders (always)

Verify the console after every change. No exceptions.
Check existing code before creating new code. Duplication is the #1 source of regression.
Game tuning lives in data, not code. ScriptableObjects > hardcoded constants.
Static state needs a reset method. Domain reload is OFF.
Preserve Python game-feel exactly. Apply unit conversions; don't eyeball.

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name	unity-development
description	General Unity development reference for Valkur — MCP workflow, console verification, project conventions (assemblies, layers, sorting), domain-reload safety, ServiceLocator, ScriptableObjects, ObjectPool, Cinemachine, URP 2D, Tilemap, UI, performance, gotchas. Load whenever writing or refactoring C# under `unity/Valkur/Assets/_Project/Scripts/`.

Unity Development for Valkur

The full canonical knowledge base lives at:

.github/skills/unity-development/SKILL.md (~540 lines, 20 sections)

Read it directly with the Read tool when you need any of:

Need	Section
MCP for Unity workflow (resources vs tools, post-edit verification, payload sizing, multi-instance)	§1
Project conventions (assembly placement, code style)	§2
Domain-reload safety pattern (mandatory for static state)	§3
ServiceLocator / SingletonMonoBehaviour / ScriptableObject / ObjectPool	§4
Physics & layers (the 8 layers + 2D physics tips)	§5
Sorting layers (depth order, the 14-layer chain)	§6
Cinemachine & camera (DetachFollow pattern)	§7
Input (legacy + New Input System; `GameEditorManager.AnyEditorActive`)	§8
URP 2D specifics (`endCameraRendering`, Light2D, Sprite-Lit-Default trap)	§9
UI conventions (uGUI, mouse+keyboard parity, modal patterns)	§10
Tilemap (Grid, TilemapCollider2D + CompositeCollider2D)	§11
Performance cheatsheet (anti-patterns → fixes)	§12
Testing (EditMode / PlayMode / CLI / parity)	§13
Editor extensions (Custom Inspector, MenuItem, PropertyDrawer, Gizmos)	§14
Common gotchas table (the pit traps)	§15
Hot reload workflow	§16
Saving & persistence (`ISaveService`, `SaveSchemaMigrator`)	§17
Audio (`IAudioService`, `AudioCatalog`, mixer routing)	§18
Migration-specific rules (unit conversions table)	§19
Quick MCP recipes (component add, hierarchy read, run menu item, asset search)	§20

Closing reminders (always)

Verify the console after every change. No exceptions.
Check existing code before creating new code. Duplication is the #1 source of regression.
Game tuning lives in data, not code. ScriptableObjects > hardcoded constants.
Static state needs a reset method. Domain reload is OFF.
Preserve Python game-feel exactly. Apply unit conversions; don't eyeball.