/gameobject-component-modify

name: gameobject-component-modify
description: 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. Three modification surfaces are available (componentDiff, pathPatches, jsonPatch) — see the skill body for details.

GameObject / Component / Modify

Three modification surfaces

Use whichever fits the task:

1. `componentDiff` — full `SerializedMember` diff (legacy, backwards compatible). 2. `pathPatches` — list of `{path, value}` pairs routed through `Reflector.TryModifyAt`; atomic per-path modification, multiple entries can target different depths. 3. `jsonPatch` — a JSON Merge Patch (RFC 7396, extended with `[i]`/`[key]` notation) routed through `Reflector.TryPatch`; multiple fields at any depth in a single call.

When more than one is supplied they run in this order: `jsonPatch` → `pathPatches` → `componentDiff`. At least one is required.

Path syntax

`fieldName`, `nested/field`, `arrayField/[i]`, `dictField/[key]`. Leading `#/` is stripped.

How to Call

unity-mcp-cli run-tool gameobject-component-modify --input '{
  "gameObjectRef": "string_value",
  "componentRef": "string_value",
  "componentDiff": "string_value",
  "pathPatches": "string_value",
  "jsonPatch": "string_value"
}'

> For complex input (multi-line strings, code), save the JSON to a file and use: > ```bash > unity-mcp-cli run-tool gameobject-component-modify --input-file args.json > ``` > > Or pipe via stdin (recommended): > ```bash > unity-mcp-cli run-tool gameobject-component-modify --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 | |------|------|----------|-------------| | `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` | No | Optional. The full component data to apply (legacy path). 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. | | `pathPatches` | `any` | No | Optional. List of path-scoped patches routed through Reflector.TryModifyAt. Each entry targets one field/element/entry by path. Path syntax: 'fieldName', 'nested/field', 'arrayField/[i]', 'dictField/[key]'. | | `jsonPatch` | `any` | No | Optional. JSON Merge Patch (RFC 7396, extended with [i]/[key] keys) routed through Reflector.TryPatch. Allows multiple fields at any depth to be updated in a single call. Use '$type' for compatible-subtype replacement. |

Input JSON Schema

{
  "type": "object",
  "properties": {
    "gameObjectRef": {
      "$ref": "#/$defs/AIGD.GameObjectRef"
    },
    "componentRef": {
      "$ref": "#/$defs/AIGD.ComponentRef"
    },
    "componentDiff": {
      "$ref": "#/$defs/com.IvanMurzak.ReflectorNet.Model.SerializedMember"
    },
    "pathPatches": {
      "$ref": "#/$defs/System.Collections.Generic.List(AIGD.PathPatch)"
    },
    "jsonPatch": {
      "anyOf": [
        {
          "type": "string"
        },
        {
          "type": "object",
          "additionalProperties": true
        }
      ]
    }
  },
  "$defs": {
    "System.Type": {
      "type": "string"
    },
    "AIGD.GameObjectRef": {
      "type": "object",
      "properties": {
        "instanceID": {
          "type": "integer",
          "description": "instanceID of the UnityEngine.Object. If it is '0' and 'path', 'name', 'assetPath' and 'assetGuid' is not provided, empty or null, then it will be used as 'null'. Priority: 1 (Recommended)"
        },
        "path": {
          "type": "string",
          "description": "Path of a GameObject in the hierarchy Sample 'character/hand/finger/particle'. Priority: 2."
        },
        "name": {
          "type": "string",
          "description": "Name of a GameObject in hierarchy. Priority: 3."
        },
        "assetType": {
          "$ref": "#/$defs/System.Type",
          "description": "Type of the asset."
        },
        "assetPath": {
          "type": "string",
          "description": "Path to the asset within the project. Starts with 'Assets/'"
        },
        "assetGuid": {
          "type": "string",
          "description": "Unique identifier for the asset."
        }
      },
      "required": [
        "instanceID"
      ],
      "description": "Find GameObject in opened Prefab or in the active Scene."
    },
    "AIGD.ComponentRef": {
      "type": "object",
      "properties": {
        "index": {
          "type": "integer",
          "description": "Component 'index' attached to a gameObject. The first index is '0' and that is usually Transform or RectTransform. Priority: 2. Default value is -1."
        },
        "typeName": {
          "type": "string",
          "description": "Component type full name. Sample 'UnityEngine.Transform'. If the gameObject has two components of the same type, the output component is unpredictable. Priority: 3. Default value is null."
        },
        "instanceID": {
          "type": "integer",
          "description": "instanceID of the UnityEngine.Object. If this is '0', then it will be used as 'null'."
        }
      },
      "required": [
        "index",
        "instanceID"
      ],
      "description": "Component reference. Used to find a Component at GameObject."
    },
    "com.IvanMurzak.ReflectorNet.Model.SerializedMemberList": {
      "type": "array",
      "items": {
        "$ref": "#