Unity-Technologies

Batching techniques for queries, projectiles/shooters, and swarm/flocking behaviors (boids)

Collision detection, contact manifolds, collision responses, determinism, and character collision handling

Component authoring patterns and best practices for Unity PhysicsCore2D

High-level patterns and gameplay strategies for destructible objects in Unity PhysicsCore2D — slicing mechanics, fragmenting on impact, sprite-based destructible systems, debris cleanup, performance budgeting. Use for "how should I design destructible X?" questions. For the PhysicsDestructor type API and worked code examples see unity-physicscore2d-destructor; for raw member signatures see unity-physicscore2d-destructor-api.

Factory patterns for creating complex physics objects (ragdolls, soft bodies, vehicles, gears, mechanical systems)

Collision filtering, layer-based interactions, custom collision filters, and trigger areas

Environmental forces (wind), surface forces, and directional force application

Physics material properties including friction, bounciness/restitution, rolling resistance, and surface velocity (conveyor belts)

Use when starting a brand-new Unity game or project from scratch — "make/start/create a new game", "bootstrap a Unity project", "I want to build a <genre> game", "scaffold/prototype a game", game jam, greenfield, blank project, project setup. A guided flow that gathers the concept, target platforms, and monetization, installs the Editor in the background while it asks, then creates the project and source control and installs packages — delegating the mechanics to the unity-cli and unity-package-management skills and handing off monetization to the dedicated skills. Does not scaffold gameplay code.

Use when interacting with Unity CLI from the terminal — install, upgrade or uninstall editors, create, list or open projects, manage modules, manage licenses, check auth status, read logs, browse Unity releases, build/test projects, configure the Unity MCP server for AI agents, or run any other Unity CLI operation. For a guided idea-to-running-project flow for a brand-new game, use the new-unity-project skill instead.

Use when adding, removing, upgrading, or discovering Unity (UPM) packages programmatically from outside the Editor — headless or CI package installs via the C# UnityEditor.PackageManager.Client API, verifying package ids/versions against the Unity registry, or choosing which packages a game needs by genre, platform, and monetization. The Unity CLI does not manage UPM packages, so this skill covers that gap. Triggers on "install a Unity package", "add com.unity.*", "set up packages headless/CI", "which packages for a <genre> game".

Implement, configure, and debug Unity In-App Purchases (IAP) — store connection, product catalog, consumable/non-consumable/subscription purchases, two-step pending-confirm flow, receipt validation, entitlement checking, restore transactions, Apple extensions (promotional purchases, Ask-to-Buy, code redemption), and Google Play extensions (subscription upgrade/downgrade), D2C Capabilities(direct to customer), 3rd party payment provider (Stripe/Coda) via Unity IAP/Unity Cloud. Use when the user needs to add, modify, debug, or migrate from native Android/iOS billing, 3rd party packages(RevenueCat/Adapty/Essential Kit/Unipay supported) to IAP. Triggers on microtransactions (MTX), monetization, real-money purchases, store purchases, buying items, support D2C, purchase via Stripe/Coda, migrate from native billing(Google's BillingClient or Apple's StoreKit/SKPaymentQueue/SKProduct)/RevenueCat/Adapty/EssentialKit/Unipay.

Build and operate a live game using Unity Services. Use when the user needs to implement, connect, or debug backend-driven features — battle passes, achievements, player progression, cloud saves, leaderboards, matchmaking, virtual economies, server-authoritative logic, anti-cheat, player accounts and authentication, remote configuration, feature flags, A/B testing, analytics, or cloud resource deployment. Triggers on live-ops, live service, backend, server authority, cloud code, cloud save, remote config, player data, retention, monetization loop, season pass, ranking, multiplayer sessions, lobbies, or any Unity Services integration.

Use when integrating LevelPlay (IronSource) ads into a Unity project — installing the Ads Mediation package, resolving native dependencies, initializing the SDK, or implementing rewarded ads, interstitials, or banners. Also use for LevelPlay-related errors, privacy compliance (GDPR, CCPA, COPPA), iOS setup (ATT, SKAdNetwork), or impression-level revenue tracking (ILRD).

Add a new subcommand to the Memory Snapshot Data Tool CLI (the .NET 10 `MemorySnapshotDataTools` exe), wiring it through CliOptions → CommandLineBuilder → Program → a Core runner, then documenting it in README.md. Use when asked to add, create, or expose a new CLI command/subcommand (alongside export, batch-export, report, multi-report, validate, summary, upgrade), or a new flag/argument on an existing one.

Generate and view Unity memory snapshot reports. Use when the user wants to analyze a Unity memory snapshot, export it to a database, validate an export against Unity golden values, or generate/view an HTML report.

Validate a Memory Snapshot Data Tool export against Unity Memory Profiler "golden" values — extract a {name}_golden.json in Unity, export the same .snap to a database, run the `validate` CLI command, and interpret the pass/fail result, tolerances, and failures. Use when asked to validate/verify an export, check it matches Unity's Memory Profiler, produce or read a golden file, debug a validation failure, or change what golden validation compares.

Write and manage SQL queries against an exported Unity memory-snapshot database (DuckDB/SQLite), and keep the schema, views, version, and docs consistent. Use when writing/editing queries over native_objects, native_allocations, native_roots, memory_regions, system_memory_regions, etc.; investigating memory regions; adding or changing tables/views/macros; or checking database version compatibility.

Build, run, screenshot, and test the Memory Snapshot Data Tool — the .NET 10 CLI that exports Unity .snap memory snapshots to DuckDB/SQLite and renders an HTML report. Use when asked to run, start, build, or test the tool, export a snapshot, generate or screenshot a report, or confirm a change works in the real app.