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Reported issues for io.github.IvanMurzak/Unity-MCP

Pod holds 24 of 150 problems reported by people outside the maintainer team. Issues filed by the project's own owners, members and collaborators are excluded entirely — a maintainer's release checklist is not a warning to a prospective user.

Back to io.github.IvanMurzak/Unity-MCP.

Most discussed

EntityID (64-bit) loses precision when passed as JSON number in gameobject-find tool

Environment

Unity version: 6 (with EntityID replacing instanceID since Unity 6.5+) MCP Tool: gameobject-find Tool Input Field: gameObjectRef.instanceID

Description

Since Unity 6.5, GameObject.GetInstanceID() was deprecated in favor of GameObject.GetEntityID(), which returns a 64-bit integer (long). The gameobject-find tool's input schema defines instanceID as UnityEngine.EntityId typed as "type": "integer" in JSON Schema, but JSON numbers are parsed as IEEE 754 double-precision floats (do

Read the thread · 2026-05-18 · closed · external user · 8 comments

Failed to update to v0.69.0

Unity Version

2022.3

Compile Error Output

Library\PackageCache\com.ivanmurzak.unity.mcp@0.69.0\Editor\Scripts\API\Tool\Assets.Shader.GetData.cs(66,13): error CS0246: The type or namespace name 'ViewQuery' could not be found (are you missing a using directive or an assembly reference?) Library\PackageCache\com.ivanmurzak.unity.mcp@0.69.0\Editor\Scripts\API\Tool\Assets.GetData.cs(55,13): error CS0246: The type or namespace name 'ViewQuery' could not be found (are you missing a using directive

Read the thread · 2026-05-04 · closed · external user · 14 comments

Error serializing UI hierarchy with TextMeshProUGUI using MCP tools

Unity-MCP: 0.35.2 Unity: 6000.3.1f1 (LTS) VS Code Insiders : 1.108.0-insider (user setup) Commit: 7f08f95ad54782bd242f5536470b330282197333 Date: 2025-12-19T14:09:25.917Z Electron: 39.2.7 ElectronBuildId: 12953945 Chromium: 142.0.7444.235 Node.js: 22.21.1 V8: 14.2.231.21-electron.0 OS: Windows_NT x64 10.0.19045

Description: When using the MCP unit tools to serialize GameObject hierarchies containing UI objects with TextMeshProUGUI components, multiple errors are logged. The errors indicate i

Read the thread · 2026-01-03 · closed · outside contributor · 9 comments

Unable to connect with claude Desktop

It keeps throwing the following errors when trying to connect to Claude desktop, although it used to work before. I have used old and current MCP versions yet and tried different things like checking firewall settings, restarting Unity Editor, restarting Claude desktop, etc, yet did not work

The errors from claude desktop logs

2025-09-01T22:36:01.388Z [info] [Unity-MCP] Server started and connected successfully 2025-09-01T22:36:01.425Z [info] [Unity-MCP] Message from client: {"method":"initia

Read the thread · 2025-09-01 · closed · external user · 7 comments

[Usability] Dependencies are included in client builds

If I understand this repo and the purpose correctly, I can find no reason for making any of the code, assemblies or dlls available in client builds. The com.IvanMurzak.Unity.MCP.Runtime.asmdef and others are not marked editor only, and all the nuget dependencies also seem to be included in client builds.

I have tried setting 

"includePlatforms": [
        "Editor"
    ]

on the Unity.MCP.* assemblies which removes those from the build, but the NuGet DLLs are still included in standalon

Read the thread · 2025-08-29 · closed · external user · 7 comments

How do I add mcp to claudecode running on windows?

I can't find any relevant information online, does anyone know?

Read the thread · 2025-07-28 · closed · external user · 10 comments

The type or namespace name 'Immutable' does not exist in the namespace 'System.Collections'

Hello,

I'm installing your package following all the instructions, however in the last step after installing package, there are compilation errors in unity about not knowing 'Immutable' type.

Library/PackageCache/com.ivanmurzak.unity.mcp@f0176c4d3b41/Server/Common/Runner/Resource/Content/RunResourceContext.cs(4,26): error CS0234: The type or namespace name 'Immutable' does not exist in the namespace 'System.Collections' (are you missing an assembly reference?)

`Library/PackageCache/com.ivan

Read the thread · 2025-07-06 · closed · outside contributor · 10 comments

Failed to validate tool d95_GameObject_ModifyComponent: TypeError: Cannot use 'in' operator to search for 'type' in true

I have just started using your cool project to see what it could do! However, in visual studio code I always get this error above... seems to work in cursor though.

Read the thread · 2025-04-24 · closed · external user · 7 comments

Most recent

unity-mcp-cli derives the local port with ProjectIdentity v1 while the plugin uses v2 — status/wait-for-ready probe the wrong port on Windows

Summary

unity-mcp-cli derives the deterministic local port with the v1 ProjectIdentity algorithm, while the Unity plugin and setup-mcp use v2. On Windows the two disagree, because v1 does not normalise \ to /. Five CLI code paths therefore probe a port nothing is listening on.

The runtime path (agent ↔ broker ↔ Editor) is unaffected — only the CLI's own diagnostics and wait-for-ready are, which is probably why this has gone unnoticed.

Environment

Read the thread · 2026-08-28 · open · external user · 0 comments

tests-run: filter validation count ORs the fields Unity ANDs

I was reading #950 and went one level down into CountFilteredTests, since it is the second of the two fixes suggested there. It has a separate problem.

CountFilteredTests (Tests.Run.cs:317-377) sets matches = true if any one of assembly / namespace / class / method matches — an OR across the four parameters. CreateTestFilter maps those four onto three Unity fields (:213, :231, :234): assemblyNames, groupNames (namespace and class), testNames (method). `RuntimeTestRunnerFil

Read the thread · 2026-08-27 · open · external user · 0 comments

Extension packages don't carry the UNITY_MCP_DEPS_ gate, so a core upgrade still deadlocks the editor in Safe Mode

Summary

Upgrading com.ivanmurzak.unity.mcp 0.89.0 -> 0.90.0 put the editor into Safe Mode with 873 CS0246 errors. The core package's dependency-generation gate worked exactly as designed — but the seven extension packages gate on UNITY_MCP_READY only, so they compiled against the core assemblies that the gate had (correctly) skipped. The failed compile blocked the domain reload, which meant NuGetDependencyResolver's [InitializeOnLoad] never ran, which meant the define could neve

Read the thread · 2026-08-25 · closed · external user · 1 comment

tests-run: TotalTests ignores all filters (counts entire test tree)

tests-run reports TotalTests as the size of the entire test tree for the given testMode, ignoring testAssembly / testNamespace / testClass / testMethod. PassedTests / FailedTests / SkippedTests count only executed tests, so the summary is internally inconsistent whenever a filter is set.

Repro

Unity 6000.3.5f1, com.ivanmurzak.unity.mcp 0.87.0. Project has 941 tests in EditModeTests.dll.

tests-run { testMode: EditMode, testAssembly: "EditModeTests", testClass: "S

[Read the thread](https://github.com/IvanMurzak/Unity-MCP/issues/950) · 2026-08-13 · open · external user · 2 comments

### Invalid API Response: The provider returned an empty or unparsable response

Cline (gpt 5.6) wanted to execute:
```bash
cd /Projects/my-sample || exit 1
printf '%s\n' '=== ACTIVE TEST RUN LOG ==='
grep -nE '65232f7a-2748-424e-83b3-a16e9b28905f|\[TestRunner\]|RunStarted|RunFinished|Test run' Logs/Editor.log | tail -n 180
printf '%s\n' '=== TEST ASSEMBLY TIMESTAMPS ==='
stat -f '%Sm %N' -t '%Y-%m-%d %H:%M:%S' \
  Library/ScriptAssemblies/my-sample.Gameplay.dll \
  Library/ScriptAssemblies/my-sample.ServerDomain.dll \
  Library/ScriptAssemblies/my-sample.ServerDomain.Tests.

[Read the thread](https://github.com/IvanMurzak/Unity-MCP/issues/949) · 2026-08-08 · closed · external user · 1 comment

### tests-run returns "after 10 retries" error while tests actually run — retry budget (~10s) is shorter than the domain reload it must survive (16-20s)

## Summary

`tests-run` frequently returns `isError: true` with

Invoke 'RunCallTool': Failed to invoke 'com.IvanMurzak.McpPlugin.Common.Model.RequestCallTool' after 10 retries.


while the tests **actually run to completion in Unity**. The AI agent sees a failure, retries, and the tests run a second time — or worse, the agent reports the tool as broken.

Root cause: entering the EditMode test context triggers a Unity **domain reload**, which drops the plugin's SignalR connection to the s

[Read the thread](https://github.com/IvanMurzak/Unity-MCP/issues/945) · 2026-08-01 · closed · external user · 1 comment

### Unity June 30, 2026 ToS: evidence of Authorized Agentic Access?

We are evaluating release 0.86.1 for a commercial Windows PC project using Unity 6.3 LTS.

Unity's Terms of Service, last updated June 30, 2026, define "Authorized Agentic Access" and Sections 17.2(ff) and 17.2(gg) restrict MCP/agent access and third-party integrations unless Unity has authorized the relevant gateway, agent/model, MCP client, MCP server, and integration.

Could the maintainers please link to verifiable Unity authorization that covers the current release, specifically:

- package

[Read the thread](https://github.com/IvanMurzak/Unity-MCP/issues/930) · 2026-07-22 · closed · external user · 1 comment

### new "generated configuration" for mcp server breaks custom connections from claude and codex

The new generated config for mcp on a local custom setup breaks the mcp connection to the server. in the config it adds an api path to the end of the server(i.e./p/randomcharsandnumbers) This results in a response: 404 (POST /p/randomcharsandnumbers) inside the unity console. As soon as I removed that portion from both mcp connections the connection was restored. I am using version 0.84.0 freshly updated about 20 minutes ago and unity 6.5

[Read the thread](https://github.com/IvanMurzak/Unity-MCP/issues/892) · 2026-07-15 · closed · external user · 2 comments

### `System.Memory.dll` installed by Unity-MCP changes `MemoryMarshal.Write` signature and breaks existing runtime assemblies

# `System.Memory.dll` installed by Unity-MCP changes `MemoryMarshal.Write` signature and breaks existing runtime assemblies

## Environment

- Unity: `2022.3.62f2c1`
- Unity-MCP: `0.83.1`
- API compatibility level: `.NET Standard 2.1`
- C# language version: `10`
- Operating system: Windows

## Description

After installing Unity-MCP, its dependency resolver installs the following assembly:

```text
Assets/Plugins/NuGet/System.Memory.dll

The installed assembly comes from `System.Memory 4.5.5

Read the thread · 2026-07-15 · closed · external user · 2 comments

Gemini Code Assistant - Cloud (Unknown)

Hello, I've found that after I configure the Gemini - json file in VS Code, It does connect, But it says Gemini CLI (Unknown) repeatedly in green, So I disconnected. Gemini Code Assistant is still available, Using Flash and Pro 2.5, after configuring the cloud setup. MCP for Unity (Coplay) automatically connects with Gemini Code Assistant after I set up the json and makes it much more helpful. Your MCP server seems to be much more advanced, helping greatly with agents in Cline and Kilocode. Ho

Read the thread · 2026-07-10 · open · external user · 0 comments

Race condition in FileLogStorage.Clear() / BufferedFileLogStorage.Clear() causes "file being used by another process" on Console/ClearLogs

Environment

Package: com.ivanmurzak.unity.mcp v0.82.3 (latest, registry source) Unity: 6000.3.8f1 OS: Windows 11 Reproduces consistently in an actively-running Editor session (game in Play Mode / logging happening), intermittently otherwise Summary Calling the Console / Clear Logs MCP tool (console-clear-logs) intermittently fails with:

Tool execution failed for 'Console / Clear Logs': One or more errors occurred. (The process cannot access the file 'Temp\mcp-server\ai-editor-logs.txt' because

Read the thread · 2026-07-02 · open · external user · 2 comments

MCP failed after claude update.

▎ Subject: Paid plan — /mcp endpoint returns 401 for all generated API tokens ▎ ▎ Account: jeroent@gmail.com (member since June 21, 2026). I upgraded from Free to a paid plan specifically to use the MCP/AI proxy. ▎ ▎ Every API token I generate is rejected by the MCP endpoint. I've tested 4 different freshly-generated tokens (both before and after upgrading), with this exact request: ▎ ▎ POST https://ai-game.dev/mcp ▎ Authorization: Bearer ▎ Content-Type: application/json

Read the thread · 2026-06-26 · closed · external user · 2 comments

The package update will softlock the additional unity instance spawned by the MPPM

ImageImage

When using Unity Multiplayer package to launch a second virtual player, the Updated tab will hijack the whole virtual player, and pressing OK button will kill the instance. Any button that triggers a package operation forces a domain

Read the thread · 2026-06-24 · closed · external user · 2 comments

After updating to 0.82.1, server binary not downloaded on Linux

Environment

After updating the plugin to 0.82.1 from an older version, the MCP server stopped starting correctly. I am not completely sure what the exact cause was, but the issue started right after the package update. The older plugin version seemed to host the server itself on a random port, while 0.82.1 appears to use a separately downloaded gamedev-mcp-server binary and connects to i

Read the thread · 2026-06-21 · closed · external user · 0 comments

tests-run tool causes Unity Editor deadlock in v0.81.1

Bug Report

Description

The tests-run MCP tool causes Unity Editor to completely deadlock (main thread blocked) in v0.81.1. This is a regression from v0.81.0 where the tool returned timeout/null responses but didn't block Unity.

Environment

Reproduction Steps

  1. Initialize MCP session (POST to localhost:28983/mcp)
  2. Call `t

Read the thread · 2026-06-20 · open · external user · 2 comments

Missing ReflectorNet dependency causes CS0246 compilation error

Issue Type

Bug Report

Environment

Description

The com.ivanmurzak.unity.mcp package has a missing dependency on com.IvanMurzak.ReflectorNet, causing compilation errors immediately after installation.

Error Message

Library/PackageCache/com.ivanmurzak.unity.mcp@5307b203acea/Runtime/Data/GameObjectData.cs(27,16): error CS0246: The type or namespace name 'SerializedMember' could not be found (are you mi

[Read the thread](https://github.com/IvanMurzak/Unity-MCP/issues/839) · 2026-06-20 · closed · external user · 1 comment

The remaining reports are on [the project's issue tracker](https://github.com/IvanMurzak/Unity-MCP/issues).