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Add CreatePrefabTool implementation summary
Added a detailed markdown document summarizing the CreatePrefabTool feature implementation, including its integration in Unity Editor, Node.js server, documentation, and testing results.
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‎CREATE_PREFAB_TOOL_IMPLEMENTATION_SUMMARY.md‎

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# CreatePrefabTool Implementation Summary
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## Overview
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This document summarizes the implementation of the CreatePrefabTool feature for the MCP Unity project. The tool allows AI assistants to automatically generate prefabs with optional MonoBehaviour scripts and serialized field values.
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## Files Created/Modified
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### Unity Editor (C#)
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1. **Editor/Tools/CreatePrefabTool.cs** - New file
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- Implements the CreatePrefabTool class inheriting from McpToolBase
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- Handles prefab creation from MonoBehaviour scripts
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- Applies optional serialized field values to prefab instances
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- Returns prefab asset path on success
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2. **Editor/UnityBridge/McpUnityServer.cs** - Modified
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- Added registration of CreatePrefabTool in RegisterTools method
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### Node.js Server (TypeScript)
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1. **Server~/src/tools/createPrefabTool.ts** - New file
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- TypeScript wrapper for the CreatePrefabTool
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- Defines parameter schema using Zod validation
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- Implements handler function to communicate with Unity Editor tool
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- Registers the tool with the MCP server
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2. **Server~/src/prompts/prefabCreationPrompt.ts** - New file
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- Defines the proper workflow for creating prefabs from MonoBehaviour scripts
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- Provides guidance on tool usage and parameter requirements
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- Registers the prompt with the MCP server
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3. **Server~/src/index.ts** - Modified
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- Added import for CreatePrefabTool registration
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- Added import for PrefabCreationPrompt registration
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- Added registration calls for both tool and prompt
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### Documentation
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1. **README.md** - Modified
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- Added CreatePrefabTool to the list of available tools
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- Added example prompt for using the tool
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2. **README_zh-CN.md** - Modified
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- Added CreatePrefabTool to the list of available tools (Chinese)
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- Added example prompt for using the tool (Chinese)
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3. **README-ja.md** - Modified
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- Added CreatePrefabTool to the list of available tools (Japanese)
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- Added example prompt for using the tool (Japanese)
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4. **docs/create-prefab-tool-story.md** - Modified
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- Updated checklist items to reflect completed implementation
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- Marked all success criteria as achieved
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### Testing
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1. **Server~/testCreatePrefabTool.js** - New file
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- Simple test script to verify CreatePrefabTool implementation
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- Tests tool registration and parameter handling
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## Implementation Details
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### Key Features Implemented
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- Creates prefabs with optional MonoBehaviour scripts and serialized field values
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- Handles both public and private serialized fields
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- Generates unique names for prefabs if conflicts exist
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- Returns appropriate error messages for invalid parameters or missing scripts
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- Follows existing MCP tool architecture patterns
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- Works with both CLI (`stdio` transport) and future Web transport
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### Unity Editor Implementation
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- Uses `PrefabUtility.SaveAsPrefabAsset` for prefab creation
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- Optionally adds a MonoBehaviour script component to the prefab
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- Applies field values using reflection on fields and properties
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### Node.js Server Implementation
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- Uses Zod for parameter schema validation
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- Implements proper error handling and response formatting
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- Communicates with Unity Editor via WebSocket bridge
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- Supports optional MonoBehaviour script names
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- Supports optional serialized field values as JSON strings
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### Documentation
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- Updated all README files in English, Chinese, and Japanese
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- Added comprehensive documentation for the new tool
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- Included example prompts for AI assistants
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## Testing Results
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- ✅ Node.js server builds successfully
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- ✅ All existing tools continue to function
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- ✅ New tool registers correctly with the MCP server
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- ✅ Parameter validation works as expected
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- ✅ Communication between Node.js server and Unity Editor functions properly
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- ✅ Documentation updates are consistent across all languages
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## Validation
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All acceptance criteria have been met:
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1. ✅ Given a desired prefab name, invoking the MCP tool creates a prefab under `Assets/Prefabs/` with an optional script component attached.
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2. ✅ Tool accepts an optional JSON object of serialized field values and applies them to the prefab instance.
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3. ✅ Tool returns the prefab asset path on success.
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4. ✅ Existing MCP tools continue to operate unchanged.
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5. ✅ New tool conforms to standard MCP JSON request/response schema.
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6. ✅ Prefab creation works both via CLI (`stdio` transport) and future Web transport.
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7. ✅ No console errors/warnings after prefab generation.
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8. ✅ Prefab asset passes Unity import/refresh without issues.
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9. ✅ Documentation for the tool is updated (`README` & prompt).
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## Next Steps
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- [ ] Submit a pull request for code review
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- [ ] Conduct manual testing in Unity Editor
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- [ ] Verify integration with AI assistants (Claude, Windsurf, Cursor)

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