Modify a specific Component on a GameObject in opened Prefab or in a Scene. Allows direct modification of component fields and properties without wrapping in GameObject structure. Use 'gameobject-component-get' first to inspect the component structure before modifying.
unity-mcp-cli run-tool gameobject-component-modify --input '{
"gameObjectRef": "string_value",
"componentRef": "string_value",
"componentDiff": "string_value"
}'
For complex input (multi-line strings, code), save the JSON to a file and use:
unity-mcp-cli run-tool gameobject-component-modify --input-file args.jsonOr pipe via stdin (recommended):
unity-mcp-cli run-tool gameobject-component-modify --input-file - <<'EOF' {"param": "value"} EOF
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.
| Name | Type | Required | Description |
|---|---|---|---|
gameObjectRef | any | Yes | Find GameObject in opened Prefab or in the active Scene. |
componentRef | any | Yes | Component reference. Used to find a Component at GameObject. |
componentDiff | any | Yes | The component data to apply. Should contain 'fields' and/or 'props' with the values to modify. |
| Only include the fields/properties you want to change. | |||
| Any unknown or invalid fields and properties will be reported in the response. |
{
"type": "object",
"properties": {
"gameObjectRef": {
"$ref": "#/$defs/com.IvanMurzak.Unity.MCP.Runtime.Data.GameObjectRef"
},
"componentRef": {
"$ref": "#/$defs/com.IvanMurzak.Unity.MCP.Runtime.Data.ComponentRef"
},
"componentDiff": {
"$ref": "#/$defs/com.IvanMurzak.ReflectorNet.Model.SerializedMember"
}
},
"$defs": {
"System.Type": {
"type": "string"
},
"com.IvanMurzak.Unity.MCP.Runtime.Data.GameObjectRef": {
"type": "object",
"properties": {
"instanceID": {
"type": "integer",
"description": "instanceID of the UnityEngine.Object. If it is '0' and 'path', 'name', 'assetPath' and 'assetGuid' is not provided, empty or null, then it will be used as 'null'. Priority: 1 (Recommended)"
},
"path": {
"type": "string",
"description": "Path of a GameObject in the hierarchy Sample 'character/hand/finger/particle'. Priority: 2."
},
"name": {
"type": "string",
"description": "Name of a GameObject in hierarchy. Priority: 3."
},
"assetType": {
"$ref": "#/$defs/System.Type",
"description": "Type of the asset."
},
"assetPath": {
"type": "string",
"description": "Path to the asset within the project. Starts with 'Assets/'"
},
"assetGuid": {
"type": "string",
"description": "Unique identifier for the asset."
}
},
"required": [
"instanceID"
],
"description": "Find GameObject in opened Prefab or in the active Scene."
},
"com.IvanMurzak.Unity.MCP.Runtime.Data.ComponentRef": {
"type": "object",
"properties": {
"index": {
"type": "integer",
"description": "Component 'index' attached to a gameObject. The first index is '0' and that is usually Transform or RectTransform. Priority: 2. Default value is -1."
},
"typeName": {
"type": "string",
"description": "Component type full name. Sample 'UnityEngine.Transform'. If the gameObject has two components of the same type, the output component is unpredictable. Priority: 3. Default value is null."
},
"instanceID": {
"type": "integer",
"description": "instanceID of the UnityEngine.Object. If this is '0', then it will be used as 'null'."
}
},
"required": [
"index",
"instanceID"
],
"description": "Component reference. Used to find a Component at GameObject."
},
"com.IvanMurzak.ReflectorNet.Model.SerializedMemberList": {
"type": "array",
"items": {
"$ref": "#/$defs/com.IvanMurzak.ReflectorNet.Model.SerializedMember"
}
},
"com.IvanMurzak.ReflectorNet.Model.SerializedMember": {
"type": "object",
"properties": {
"typeName": {
"type": "string",
"description": "Full type name. Eg: 'System.String', 'System.Int32', 'UnityEngine.Vector3', etc."
},
"name": {
"type": "string",
"description": "Object name."
},
"value": {
"description": "Value of the object, serialized as a non stringified JSON element. Can be null if the value is not set. Can be default value if the value is an empty object or array json."
},
"fields": {
"type": "array",
"items": {
"$ref": "#/$defs/com.IvanMurzak.ReflectorNet.Model.SerializedMember",
"description": "Nested field value."
},
"description": "Fields of the object, serialized as a list of 'SerializedMember'."
},
"props": {
"type": "array",
"items": {
"$ref": "#/$defs/com.IvanMurzak.ReflectorNet.Model.SerializedMember",
"description": "Nested property value."
},
"description": "Properties of the object, serialized as a list of 'SerializedMember'."
}
},
"required": [
"typeName"
],
"additionalProperties": false
}
},
"required": [
"gameObjectRef",
"componentRef",
"componentDiff"
]
}
{
"type": "object",
"properties": {
"result": {
"$ref": "#/$defs/com.IvanMurzak.Unity.MCP.Editor.API.Tool_GameObject+ModifyComponentResponse"
}
},
"$defs": {
"com.IvanMurzak.Unity.MCP.Runtime.Data.ComponentRef": {
"type": "object",
"properties": {
"index": {
"type": "integer",
"description": "Component 'index' attached to a gameObject. The first index is '0' and that is usually Transform or RectTransform. Priority: 2. Default value is -1."
},
"typeName": {
"type": "string",
"description": "Component type full name. Sample 'UnityEngine.Transform'. If the gameObject has two components of the same type, the output component is unpredictable. Priority: 3. Default value is null."
},
"instanceID": {
"type": "integer",
"description": "instanceID of the UnityEngine.Object. If this is '0', then it will be used as 'null'."
}
},
"required": [
"index",
"instanceID"
],
"description": "Component reference. Used to find a Component at GameObject."
},
"com.IvanMurzak.Unity.MCP.Runtime.Data.ComponentDataShallow": {
"type": "object",
"properties": {
"instanceID": {
"type": "integer"
},
"typeName": {
"type": "string"
},
"isEnabled": {
"type": "string",
"enum": [
"False",
"True",
"NA"
]
}
},
"required": [
"instanceID",
"isEnabled"
]
},
"System.String[]": {
"type": "array",
"items": {
"type": "string"
}
},
"com.IvanMurzak.Unity.MCP.Editor.API.Tool_GameObject+ModifyComponentResponse": {
"type": "object",
"properties": {
"Success": {
"type": "boolean",
"description": "Whether the modification was successful."
},
"Reference": {
"$ref": "#/$defs/com.IvanMurzak.Unity.MCP.Runtime.Data.ComponentRef",
"description": "Reference to the modified component."
},
"Index": {
"type": "integer",
"description": "Index of the component in the GameObject's component list."
},
"Component": {
"$ref": "#/$defs/com.IvanMurzak.Unity.MCP.Runtime.Data.ComponentDataShallow",
"description": "Updated component information after modification."
},
"Logs": {
"$ref": "#/$defs/System.String[]",
"description": "Log of modifications made and any warnings/errors encountered."
}
},
"required": [
"Success",
"Index"
]
}
},
"required": [
"result"
]
}