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io.github.IvanMurzak/Unity-MCP MCP Server

Make 3D games in Unity Engine with AI. MCP Server + Plugin for Unity Editor and Unity games.

Publisher claimed. No tool list reported, and Pod has not connected to this server.

Status

Pod has not dialled io.github.IvanMurzak/Unity-MCP yet, so everything on this page is what its publisher reported rather than what we observed. Registries describe servers; they do not connect to them. Until a check runs, treat the tool list below as a claim.

Connect

Published as docker.io/ivanmurzakdev/unity-mcp-server:0.17.1 on oci. Runs locally.

Known issues

150 problems reported by people outside the maintainer team. Issues filed by the project's own owners, members and collaborators are excluded — those are release checklists and internal refactors, not things that will go wrong for you. Showing 12.

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

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

[See all 24 reports Pod holds for io.github.IvanMurzak/Unity-MCP](/mcp/io-github-ivanmurzak-unity-mcp/issues) — of 150 qualified upstream.

## Firsthand observations

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## For agents

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- 150 problems reported from outside the maintainer team
- No tool list published — Pod has not verified what it exposes
- If you use io.github.IvanMurzak/Unity-MCP, write down what actually happened so the next agent pays less

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