Summary
manage_build with action: "scenes" throws a JToken/JValue parsing exception instead of updating Build Settings scenes.
Environment
- Unity:
6000.3.7f1
- Package:
com.coplaydev.unity-mcp (@0bad2d0f59a0, from stack path)
- OS: Windows 11 x64
Repro 1 (JSON array string)
Call:
{
"action": "scenes",
"scenes": "[\"Assets/Scenes/MainScene.unity/MainScene.unity\"]"
}Actual error:
{
"success": false,
"code": "Cannot access child value on Newtonsoft.Json.Linq.JValue.",
"error": "Cannot access child value on Newtonsoft.Json.Linq.JValue.",
"data": {
"stackTrace": " at Newtonsoft.Json.Linq.JToken.get_Item (System.Object key) [0x00015] in <761cf2a144514d2291a678c334d49e9b>:0 \r\n at MCPForUnity.Editor.Tools.ManageBuild.HandleScenes (MCPForUnity.Editor.Helpers.ToolParams p) [0x00095] in .\\Library\\PackageCache\\com.coplaydev.unity-mcp@0bad2d0f59a0\\Editor\\Tools\\ManageBuild.cs:321 \r\n at MCPForUnity.Editor.Tools.ManageBuild.HandleCommand (Newtonsoft.Json.Linq.JObject params) [0x0019b] in .\\Library\\PackageCache\\com.coplaydev.unity-mcp@0bad2d0f59a0\\Editor\\Tools\\ManageBuild.cs:44 "
}
}Repro 2 (comma-separated string)
Call:
{
"action": "scenes",
"scenes": "Assets/Scenes/MainScene.unity/MainScene.unity"
}Actual result: same exception.
Expected result
action: "scenes" should accept documented input format (JSON array or comma-separated, whichever is intended) and update Build Settings scene list without throwing.
Current impact / workaround
Could not add scene via MCP tool. Manual Unity Editor workaround:
- File → Build Settings → Add Open Scenes
Summary
manage_buildwithaction: "scenes"throws a JToken/JValue parsing exception instead of updating Build Settings scenes.Environment
6000.3.7f1com.coplaydev.unity-mcp(@0bad2d0f59a0, from stack path)Repro 1 (JSON array string)
Call:
{ "action": "scenes", "scenes": "[\"Assets/Scenes/MainScene.unity/MainScene.unity\"]" }Actual error:
{ "success": false, "code": "Cannot access child value on Newtonsoft.Json.Linq.JValue.", "error": "Cannot access child value on Newtonsoft.Json.Linq.JValue.", "data": { "stackTrace": " at Newtonsoft.Json.Linq.JToken.get_Item (System.Object key) [0x00015] in <761cf2a144514d2291a678c334d49e9b>:0 \r\n at MCPForUnity.Editor.Tools.ManageBuild.HandleScenes (MCPForUnity.Editor.Helpers.ToolParams p) [0x00095] in .\\Library\\PackageCache\\com.coplaydev.unity-mcp@0bad2d0f59a0\\Editor\\Tools\\ManageBuild.cs:321 \r\n at MCPForUnity.Editor.Tools.ManageBuild.HandleCommand (Newtonsoft.Json.Linq.JObject params) [0x0019b] in .\\Library\\PackageCache\\com.coplaydev.unity-mcp@0bad2d0f59a0\\Editor\\Tools\\ManageBuild.cs:44 " } }Repro 2 (comma-separated string)
Call:
{ "action": "scenes", "scenes": "Assets/Scenes/MainScene.unity/MainScene.unity" }Actual result: same exception.
Expected result
action: "scenes"should accept documented input format (JSON array or comma-separated, whichever is intended) and update Build Settings scene list without throwing.Current impact / workaround
Could not add scene via MCP tool. Manual Unity Editor workaround: