custom-data-patterns

name	custom-data-patterns
description	Custom Data anti-patterns and corrections for Canvas plugins - unnecessary compatibility checks, misuse of AttributeHubs vs CustomModels

Custom Data Patterns

This skill identifies common anti-patterns in how Canvas plugins use Custom Data (CustomModels and AttributeHubs) and provides corrections. These patterns have been observed in real customer plugins.

When to Use This Skill

Invoke this skill proactively as soon as Custom Data is involved — don't wait for a review phase. Use it when:

• The plugin spec calls for persistent data storage (CustomModels or AttributeHubs)
• You are about to write or edit model definitions that subclass CustomModel
• You are about to write or edit code that uses AttributeHub
• You are adding relationships (ForeignKey, OneToOneField, ManyToManyField) to SDK models
• You are setting up the plugin directory structure and it will include CustomModels
• Reviewing existing plugin code that uses Custom Data

Quick Reference

Reference the custom_data_context.txt file for detailed anti-patterns with BAD/GOOD examples.