get_IsEnabled hits EditorPrefs.GetBool from ThreadPool (not main thread) — UnityException in TransportCommandDispatcher continuation

[mcanayok]

Environment

• unity-mcp version: 9.6.6 (via Unity Package Manager)
• Unity: 6000.4.2f1
• Host OS: macOS 26.3.1 (Apple M1 Pro)
• Runtime: Mono 6.13.0
• Transport: HTTP Local

What happens

McpLogRecord.get_IsEnabled calls EditorPrefs.GetBool(...) directly. When a log record fires from a TransportCommandDispatcher async continuation (ThreadPool), EditorPrefs.GetBool throws UnityException: GetBool can only be called from the main thread.

Reproducible in any project that routes MCP commands at a reasonable rate — I've captured 24 occurrences over 4 days in my project.

Observed stack

UnityEngine.UnityException: GetBool can only be called from the main thread.
at Execute (System.Threading.Tasks.Task)
at InnerInvoke (System.Threading.Tasks.ContinuationTaskFromResultTask`1)
at ProcessCommand { } (Editor/Services/Transport/TransportCommandDispatcher.cs:397)
at Log (Editor/Helpers/McpLogRecord.cs:28)
at get_IsEnabled (Editor/Helpers/McpLogRecord.cs:22)
at GetBool (UnityEditor.EditorPrefs)

Wrapped as System.AggregateException via UnobservedTaskException mechanism because the continuation is on a ThreadPool worker.

Likely fix

Cache the IsEnabled value on the main thread (e.g. in a [InitializeOnLoad] static constructor) and refresh on EditorApplication.playModeStateChanged or AssemblyReloadEvents.afterAssemblyReload. Or gate the EditorPrefs.GetBool call behind a main-thread dispatcher / cached InternalEditorUtility.isApplicationActive-style approach. Anything that avoids calling EditorPrefs.* from ThreadPool.

Why it matters

• Every event gets captured by Sentry (or whichever crash reporter the project uses) as an unhandled task exception
• Creates dashboard noise for projects that integrate Sentry (the issue ID in my project: FARMZ-TD-5, 24 events in 4 days)
• unity.is_main_thread: false tag confirms the thread context

Happy to PR

If a PR against Editor/Helpers/McpLogRecord.cs caching the enabled flag would be welcome, I can submit one.

---

Ref: https://github.com/CoplayDev/unity-mcp/blob/main/Editor/Helpers/McpLogRecord.cs#L22