Long delay on entering Play Mode

[Skeletoneyes]

Whenever I enter play mode with the MCP active (server on, Editor attached) it hangs for 10-20 seconds right after the first frame. This is extremely disruptive to making quick iterations and verifying what's going on.

After doing some perf analysis, I've narrowed it down to the MCP actually freezing the editor entirely to perform a tool refresh.

Is it feasible to disable this refresh on entering play mode? Does that need to be there for a specific reason?

[Skeletoneyes]

Update: I was able to reduce the delay significantly by doing two things locally:

1. MCPForUnity/Editor/Migrations/LegacyServerSrcMigration.cs

Problem: Migration ran on every domain reload because it only deleted legacy EditorPrefs keys if ALL clients configured successfully. One client always failed, so it retried forever.

Fix: Delete legacy keys after attempting migration, regardless of partial failures. Users who need specific clients can configure them manually.

2. MCPForUnity/Editor/Services/ToolDiscoveryService.cs

Problem: For each of 12 tools, discovery called:

• AssetDatabase.FindAssets() - searched entire project
• AssetDatabase.LoadAssetAtPath() - loaded script assets
• Regex parsing of C# source for XML doc comments

Fix: Skip asset path resolution and summary extraction during discovery. Use assembly name alone to determine if a tool is built-in. These expensive operations were only needed for UI display, not for tool registration.

[msanatan]

Great feedback @Skeletoneyes. Are you keen to make a PR to the repo?

[msanatan]

Issue 1 should be fixed, issue 2 remains