gameobject-component-add

name	gameobject-component-add
description	Add one or more Components to a GameObject in the opened Prefab or active Scene. Component types are looked up by full name (with namespace) or by class-name fallback. Use 'gameobject-find' to locate the host GameObject and 'gameobject-component-list-all' to discover valid component type names.

GameObject / Component / Add

Add Component to GameObject in opened Prefab or in a Scene. Use 'gameobject-find' tool to find the target GameObject first. Use 'gameobject-component-list-all' tool to find the component type names to add.

Inputs

• componentNames — list of component type names. Each entry may be a fully-qualified type name (preferred) or a bare class name (resolved via fallback to AllComponentTypes).
• gameObjectRef — the target GameObject. Required.

Behavior

Per-name errors (unknown type, type not assignable to UnityEngine.Component, add-failed/duplicate) are accumulated in response.Errors / response.Warnings instead of throwing, so a single bad name does not abort the whole batch. Successful additions populate response.AddedComponents with ComponentDataShallow snapshots.

How to Call

unity-mcp-cli run-tool gameobject-component-add --input '{
  "componentNames": "string_value",
  "gameObjectRef": "string_value"
}'

For complex input (multi-line strings, code), save the JSON to a file and use:

unity-mcp-cli run-tool gameobject-component-add --input-file args.json

Or pipe via stdin (recommended):

unity-mcp-cli run-tool gameobject-component-add --input-file - <<'EOF'
{"param": "value"}
EOF

Troubleshooting

If unity-mcp-cli is not found, either install it globally (npm install -g unity-mcp-cli) or use npx unity-mcp-cli instead. Read the /unity-initial-setup skill for detailed installation instructions.

Input

Name	Type	Required	Description
componentNames	any	Yes	Full name of the Component. It should include full namespace path and the class name.
gameObjectRef	any	Yes	Find GameObject in opened Prefab or in the active Scene.

Input JSON Schema

{
  "type": "object",
  "properties": {
    "componentNames": {
      "$ref": "#/$defs/System.String-1"
    },
    "gameObjectRef": {
      "$ref": "#/$defs/AIGD.GameObjectRef"
    }
  },
  "$defs": {
    "System.String-1": {
      "type": "array",
      "items": {
        "type": "string"
      }
    },
    "System.Type": {
      "type": "string"
    },
    "AIGD.GameObjectRef": {
      "type": 
       
         
           
           
        
         
           
           
        
         
           
           
        
         
           
           
        
         
           
           
        
         
           
           
        
      
       
        
      
       
    
  
   
    
    
  

Output

Output JSON Schema

{
  "type": "object",
  "properties": {
    "result": {
      "$ref": "#/$defs/AIGD.AddComponentResponse"
    }
  },
  "$defs": {
    "System.Collections.Generic.List(AIGD.ComponentDataShallow)": {
      "type": "array",
      "items": {
        "$ref": "#/$defs/AIGD.ComponentDataShallow"
      }
    },
    "AIGD.ComponentDataShallow": {
      "type": "object",
      "properties": {
        "instanceID": {
          "type": "integer"
        },
        "typeName"