[Feature] 3rd party asset bridge

[flashwade03]

Description

This feature introduces a Third Party Integration System for MCP for Unity, along with the first integration: Soap MCP Bridge.

What's included:

1. Third Party Tab in MCP for Unity Editor Window

• New "Third Party" tab in Window > MCP for Unity > Toggle MCP Window
• Auto-detects installed assets (via assembly detection)
• One-click Install/Uninstall for integration packages
• Registry system for managing multiple integrations

2. Soap MCP Bridge (ThirdParty/SoapMcpBridge/)

• Independent UPM package for https://assetstore.unity.com/packages/tools/utilities/soap-scriptableobject-architecture-pattern-232107
• New tool: manage_soap_variable with 8 actions:
  • create - Create new ScriptableVariable assets
  • list - Find all variables in project (with type filtering)
  • get / set / set_silent - Read/write variable values
  • reset - Restore to initial value
  • save / load - PlayerPrefs persistence
• Supports 11 variable types: Int, Float, Bool, String, Vector2, Vector3, Vector2Int, Color, Quaternion, GameObject, Component
• Supports SOAP Event prefabs

3. Distribution Methods

• Git URL: https://github.com/CoplayDev/unity-mcp.git?path=/ThirdParty/SoapMcpBridge
• Manual .unitypackage import
• One-click install via MCP for Unity UI

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Goal

Enable AI assistants to work with popular Unity Asset Store packages through a modular plugin architecture.

Why this matters:

• Unity developers use many third-party assets that have their own APIs and patterns
• Unfortunately MCP currently can't interact with these asset-specific features
• This system allows community-contributed integrations without bloating the core package

Why Soap as the first integration:

• Soap enforces clean separation between logic and data through ScriptableObject-based architecture
• This separation makes it ideal for vibe coding - AI can manipulate game data (variables, events) without touching complex gameplay logic
• Personally, I use Soap in all my Unity projects, so this integration directly addresses a real workflow need

Example use cases with Soap:
"Create a Float variable called PlayerHealth with initial value 100"
"Set EnemyCount to 5"
"List all Bool variables in the project"
"Reset PlayerScore to its initial value"

Future integrations (roadmap):

• DOTween MCP Bridge
• Odin Inspector MCP Bridge
• And more community contributions...