Open the tool
After Unity compiles, choose Tools → Script Contract Guard.
Official documentation & support
Safer Unity script replacements.
Script Contract Guard compares a known-good C# contract with the current source and highlights changes that may break callers or serialized Unity data.
Get started
Import the package under Assets/ScriptContractGuard. No project setting, runtime component, external service, or additional Asset Store package is required.
Verify installation
Run Built-In Self-Test. It uses embedded source and does not modify project files.
Capture a safe baseline
Select a C# script while the project is known-good, then choose Capture Safe Baseline.
Analyze after editing
Choose Analyze Current Script to review contract changes, serialized fields, and possible callers.
What it checks
The scanner focuses on the parts of a script most likely to affect other C# files or serialized project data during a replacement or refactor.
API contract changes
Removed members, changed method signatures, changed member types, and removed Unity message methods.
Serialized-field risks
Removed private [SerializeField] fields and likely same-type renames that may need [FormerlySerializedAs].
Reference candidates
Type-aware source matches under Assets/, reported with file paths and line numbers for review.
Limits & safe use
Script Contract Guard is a conservative source scanner, not a compiler, runtime test, or formal proof that behavior is unchanged.
Review manually when using
- Generated source or complex preprocessor branches
- Partial types split across files
- Reflection-only or
dynamicaccess - Uncommon or deliberately obfuscated syntax
- Behavior changes that preserve signatures
Recommended workflow
Keep the project under version control or maintain a backup. After each refactor, run normal compilation, Play Mode checks, and project tests. A possible reference is a review candidate, not a compiler-confirmed call graph.
Private by design
The package operates locally inside the Unity Editor. It does not contact a network service or send project information anywhere.
No telemetry
No analytics, tracking, account, API key, or external service is used by the package.
Local baselines
Captured contracts stay under Library/ScriptContractGuard in the local project.
User-controlled export
AI Context Packs are written only to a location the user explicitly selects. They are never uploaded automatically.
Need support?
Use the public support contact shown on the Unity Asset Store publisher profile. Include the Unity version, Script Contract Guard version, reproduction steps, and relevant Console output. Redact private source code before sending it.