Object / Modify
Modify the specified Unity Object. Allows direct modification of object fields and properties. Use 'object-get-data' first to inspect the object structure before modifying.
Three modification surfaces
Use whichever fits the task:
objectDiff— fullSerializedMemberdiff (legacy, backwards compatible).pathPatches— list of{path, value}pairs routed throughReflector.TryModifyAt; atomic per-path modification, multiple entries can target different depths.jsonPatch— a JSON Merge Patch (RFC 7396, extended with[i]/[key]notation) routed throughReflector.TryPatch; multiple fields at any depth in a single call.
When more than one is supplied they run in this order: jsonPatch → pathPatches → objectDiff. At least one is required.
Path syntax
fieldName, nested/field, arrayField/[i], dictField/[key]. Leading #/ is stripped.
How to Call
bashunity-mcp-cli run-tool object-modify --input '{ "objectRef": "string_value", "objectDiff": "string_value", "pathPatches": "string_value", "jsonPatch": "string_value" }'
For complex input (multi-line strings, code), save the JSON to a file and use:
bashunity-mcp-cli run-tool object-modify --input-file args.jsonOr pipe via stdin (recommended):
bashunity-mcp-cli run-tool object-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 |
|---|---|---|---|
objectRef | any | Yes | Reference to UnityEngine.Object instance. It could be GameObject, Component, Asset, etc. Anything extended from UnityEngine.Object. |
objectDiff | any | No | Optional. The full object 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. |
jsonPatch | any | No | Optional. JSON Merge Patch (RFC 7396, extended with [i]/[key] keys) routed through Reflector.TryPatch. |
Input JSON Schema
json{ "type": "object", "properties": { "objectRef": { "$ref": "#/$defs/AIGD.ObjectRef" }, "objectDiff": { "$ref": "#/$defs/com.IvanMurzak.ReflectorNet.Model.SerializedMember" }, "pathPatches": { "$ref": "#/$defs/System.Collections.Generic.List(AIGD.PathPatch)" }, "jsonPatch": { "anyOf": [ { "type": "string" }, { "type": "object", "additionalProperties": true } ] } }, "$defs": { "AIGD.ObjectRef": { "type": "object", "properties": { "instanceID": { "type": "integer", "description": "instanceID of the UnityEngine.Object. If this is '0', then it will be used as 'null'." } }, "required": [ "instanceID" ], "description": "Reference to UnityEngine.Object instance. It could be GameObject, Component, Asset, etc. Anything extended from UnityEngine.Object." }, "com.IvanMurzak.ReflectorNet.Model.SerializedMemberList": { "type": "array", "items": { "$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": "#/$defs/com.IvanMurzak.ReflectorNet.Model.SerializedMember", "description": "Nested property value." }, "description": "Properties of the object, serialized as a list of 'SerializedMember'." } }, "required": [ "typeName" ], "additionalProperties": false }, "AIGD.PathPatch": { "type": "object", "properties": { "Path": { "type": "string", "description": "Slash-delimited path to the target field/element/entry. Plain segment navigates a field or property (e.g. 'admin' or 'admin/name'). Use '[i]' for array/list index (e.g. 'planets/[0]/orbitRadius'). Use '[key]' for dictionary entry (e.g. 'config/[timeout]'). A leading '#/' is stripped automatically. Required." }, "Value": { "$ref": "#/$defs/com.IvanMurzak.ReflectorNet.Model.SerializedMember", "description": "The new value to write at the path. Use the standard SerializedMember envelope: 'typeName' + 'value' for primitives, or nested 'fields'/'props' for complex types. Required — omitting it overwrites the target with a default empty SerializedMember." } } }, "System.Collections.Generic.List(AIGD.PathPatch)": { "type": "array", "items": { "$ref": "#/$defs/AIGD.PathPatch" } } }, "required": [ "objectRef" ] }
Output
Output JSON Schema
json{ "type": "object", "properties": { "result": { "$ref": "#/$defs/AIGD.ModifyObjectResponse" } }, "$defs": { "AIGD.ObjectRef": { "type": "object", "properties": { "instanceID": { "type": "integer", "description": "instanceID of the UnityEngine.Object. If this is '0', then it will be used as 'null'." } }, "required": [ "instanceID" ], "description": "Reference to UnityEngine.Object instance. It could be GameObject, Component, Asset, etc. Anything extended from UnityEngine.Object." }, "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 }, "com.IvanMurzak.ReflectorNet.Model.SerializedMemberList": { "type": "array", "items": { "$ref": "#/$defs/com.IvanMurzak.ReflectorNet.Model.SerializedMember" } }, "System.String-1": { "type": "array", "items": { "type": "string" } }, "AIGD.ModifyObjectResponse": { "type": "object", "properties": { "Success": { "type": "boolean", "description": "Whether the modification was successful." }, "Reference": { "$ref": "#/$defs/AIGD.ObjectRef", "description": "Reference to the modified object." }, "Data": { "$ref": "#/$defs/com.IvanMurzak.ReflectorNet.Model.SerializedMember", "description": "Updated object data after modification." }, "Logs": { "$ref": "#/$defs/System.String-1", "description": "Log of modifications made and any warnings/errors encountered." } }, "required": [ "Success" ] } }, "required": [ "result" ] }
