The Editor crashes randomly when mcp tools are being called (probably they have incorrect values or something). I am using Claude Code but had the same issues earlier with Windsurf/Antigravity
The mcp server shows no errors
2025-12-27 12:20:11,999 - mcp.server.streamable_http_manager - INFO - Created new transport with session ID: 3af34d3cc794418c8e14fbe8673567fd
INFO: ::1:60878 - "POST /mcp HTTP/1.1" 200 OK
INFO: ::1:60878 - "POST /mcp HTTP/1.1" 202 Accepted
INFO: ::1:60878 - "GET /mcp HTTP/1.1" 200 OK
INFO: ::1:60908 - "POST /mcp HTTP/1.1" 200 OK
INFO: ::1:60910 - "POST /mcp HTTP/1.1" 200 OK
INFO: ::1:60913 - "POST /mcp HTTP/1.1" 200 OK
2025-12-27 12:20:35,928 - mcp.server.streamable_http_manager - INFO - Created new transport with session ID: 9677297299d446cfaf42755df5784d0e
INFO: ::1:61001 - "POST /mcp HTTP/1.1" 200 OK
INFO: ::1:61001 - "POST /mcp HTTP/1.1" 202 Accepted
INFO: ::1:61001 - "GET /mcp HTTP/1.1" 200 OK
INFO: ('::1', 61019) - "WebSocket /hub/plugin" [accepted]
INFO: connection open
INFO: ::1:61261 - "POST /mcp HTTP/1.1" 200 OK
INFO: ::1:61261 - "POST /mcp HTTP/1.1" 200 OK
INFO: ::1:61307 - "POST /mcp HTTP/1.1" 200 OK
INFO: ::1:61348 - "POST /mcp HTTP/1.1" 200 OK
INFO: ::1:61381 - "POST /mcp HTTP/1.1" 200 OK
INFO: ::1:61381 - "POST /mcp HTTP/1.1" 200 OK
Claude code shows MCP response with "Python error managing GameObject: " with no meaningful error message
⎿ {
"success": true,
"message": "Found 1 GameObject(s).",
… +63 lines (ctrl+o to expand)
⏺ UnityMCP - manage_scene (MCP)(action: "get_hierarchy")
⎿ {
"success": true,
"message": "Retrieved hierarchy for scene 'SampleScene'.",
… +3696 lines (ctrl+o to expand)
⏺ I can see the player has a child model HumanMale_Character_FREE. Let me check its Animator component:
⏺ UnityMCP - manage_gameobject (MCP)(action: "get_component", target: "HumanMale_Character_FREE", component_name: "Animator")
⎿ {
"success": false,
"message": "Python error managing GameObject: "
}
⏺ UnityMCP - manage_gameobject (MCP)(action: "get_components", target: "HumanMale_Character_FREE")
⎿ {
"success": false,
"message": "Python error managing GameObject: No Unity plugins are currently connected"
}
⏺ Unity connection dropped. Let me check your existing PlayerAnimator controller to see what parameters it has:
The Editor crashes randomly when mcp tools are being called (probably they have incorrect values or something). I am using Claude Code but had the same issues earlier with Windsurf/Antigravity
The mcp server shows no errors
Claude code shows MCP response with
"Python error managing GameObject: "with no meaningful error message