Assembly Definitions (Grade A)Security-tested data-ai skill for Claude AI. Grade A. Assembly definition management — when to create asmdefs, reference rules, Editor/Runtime/Test separation, platform filters, compilation speed opti

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Reviewed by Daniel Nikulshyn·Updated July 2026

Overview

Assembly definition management when to create asmdefs, reference rules, Editor/Runtime/Test separation, platform filters, and compilation speed optimization. This skill guides users on best practices for structuring and organizing their projects in Unity using assembly definitions (.asmdef). It provides recommendations on when to create asmdefs, how to reference rules, and how to separate code into different assemblies for Editor-only, Runtime, and Test code. The skill also covers optional dependencies and potential pitfalls such as circular references, missing references, and root namespace mismatches, to help users optimize their project's compilation speed and maintainability. It explains the structure of asmdef JSON and includes examples of common mistakes to avoid.

Key features

Editor/Runtime/Test separation
Platform filters
Compilation speed optimization
Reference rules for dependency management
Optional dependencies with defineConstraints

Pricing

Model: Free
Category: Skills
Rating: No reviews yet

Use cases

Large-Scale Project Organization

Use assembly definitions to split a large Unity project into manageable parts, improving compilation speed and reducing errors.

Editor and Runtime Code Separation

Create separate assemblies for Editor-only code and Runtime code to ensure efficient compilation and organization.

Dependency Management

Use reference rules and defineConstraints to manage dependencies between assemblies and optional packages.

Pros & Cons

Pros

Improves compilation speed by only recompiling changed assemblies and their dependents
Helps organize code into logical units
Reduces errors with clear dependency management

Cons

Can be complex to set up and manage, especially in large projects
Requires careful planning to avoid circular references and missing dependencies

Reviews

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Q&A

What are the potential pitfalls of using Assembly Definitions?

Potential pitfalls include circular references, missing references, and root namespace mismatches, which can be complex to set up and manage, especially in large projects.

Asked by Margaret Whitfield · Aug 27, 2025

What are the key features of Assembly Definitions?

Key features include Editor/Runtime/Test separation, platform filters, compilation speed optimization, and reference rules for dependency management.

Asked by Noelia Campos · Jul 12, 2025

How does it improve compilation speed?

It improves compilation speed by only recompiling changed assemblies and their dependents.

Asked by Carlos Mendoza · Jun 25, 2025

What is Assembly Definitions used for?

Assembly definition management, including when to create asmdefs, reference rules, and compilation speed optimization.

Asked by Oscar Lindqvist · Jun 2, 2025

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