Ensembles

mentalfaculty/Ensembles3·1 plugin

Ship Core Data and SwiftData sync with Ensembles 3 while migrating from E2 and handling compatibility and transformable-attribute edge cases.

Overview

ensembles is a plugin marketplace for the Build phase that brings Claude Code up to speed on the Ensembles 3 API, E2 migration, seed policy, compatibility mode, and transformable-attribute sync issues.

What is this marketplace?

Covers the Ensembles 3 API surface Claude needs for correct sync calls
Documents E2-to-E3 migration paths and seed policy decisions
Explains compatibility mode when mixing legacy and v3 stacks
Surfaces transformable-attribute sync failure patterns and fixes
Single-plugin marketplace focused on SwiftData and Core Data sync

Compatible agents: Claude Code, Cursor, any compatible agent

Community signal: 29 GitHub stars.

What problem does it solve?

You are implementing Ensembles 3 sync but keep hitting E2 migration traps, seed-policy mistakes, and transformable-attribute sync bugs the docs scatter across threads.

Who is it for?

Indie iOS or macOS builders actively integrating Ensembles 3 with Core Data or SwiftData who want agent answers aligned to Mental Faculty’s sync model.

Skip if: Teams on CloudKit-only sync, Android backends, or greenfield apps with no Ensembles legacy who only need generic CRUD patterns.

What do I get? / Deliverables

After adding the marketplace, Claude can propose Ensembles 3–correct API usage, migration steps, and targeted fixes for compatibility and transformable-attribute sync failures.

Agent-grounded Ensembles 3 API and migration guidance in coding sessions
Clearer handling of compatibility mode and transformable-attribute sync cases
Reduced back-and-forth when debugging Ensembles-specific sync errors

Plugins in this marketplace

1 plugin — install individually after you add the marketplace.

PluginVersion

EnsemblesBrings Claude up to speed on the Ensembles 3 API, E2-to-E3 migration, seed policy, compatibility mode, and transformable-attribute sync issues.—

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Journey fit

Primary fit

BuildIntegrations & version control

Canonical shelf is Build because the marketplace packages guidance and tooling for wiring and maintaining data sync during product implementation. Integrations fits Ensembles 3 API usage, E2-to-E3 migration, seed policy, and sync behavior—not generic UI or docs work.

How it compares

Framework-specific Claude marketplace, not a general database skill or hosted MCP server.

Common Questions / FAQ

Who is Ensembles for?

Solo and small-team Apple developers using Ensembles 3 for multi-device Core Data or SwiftData sync who rely on Claude Code during integration and migration.

When should I use Ensembles?

Use it during Build when you are wiring sync, migrating from Ensembles 2, or debugging seed policy, compatibility mode, and transformable-attribute issues.

How do I add Ensembles to my agent?

Add the mentalfaculty/Ensembles3 Claude Code marketplace from the catalog, install the Ensembles plugin, and invoke it in sessions where you edit sync-related Swift or Core Data models.