Agent skill

Unreal Object Operation

by Italink in Italink/UnrealClientProtocol

Read/write any UObject property (material settings, actor transforms, component configs, etc.), inspect object metadata, find instances, undo/redo.

MITAuto-check passedGame Development

Install Unreal Object Operation

skills CLI

$ npx skills add Italink/UnrealClientProtocol --skill unreal-object-operation -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install Italink/UnrealClientProtocol unreal-object-operation --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/Italink/UnrealClientProtocol.git skills-src && mkdir -p .claude/skills && cp -r skills-src/Skills/unreal-object-operation .claude/skills/unreal-object-operation && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "unreal-object-operation" agent skill from https://github.com/Italink/UnrealClientProtocol/tree/main/Skills/unreal-object-operation into .claude/skills/unreal-object-operation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "unreal-object-operation", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/Italink/UnrealClientProtocol/tree/main/Skills/unreal-object-operation

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add Italink/UnrealClientProtocol --skill unreal-object-operation -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install Italink/UnrealClientProtocol unreal-object-operation --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/Italink/UnrealClientProtocol.git skills-src && mkdir -p .agents/skills && cp -r skills-src/Skills/unreal-object-operation .agents/skills/unreal-object-operation && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "unreal-object-operation" agent skill from https://github.com/Italink/UnrealClientProtocol/tree/main/Skills/unreal-object-operation into .agents/skills/unreal-object-operation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "unreal-object-operation", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add Italink/UnrealClientProtocol --skill unreal-object-operation -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install Italink/UnrealClientProtocol unreal-object-operation --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/Italink/UnrealClientProtocol.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/Skills/unreal-object-operation .cursor/skills/unreal-object-operation && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "unreal-object-operation" agent skill from https://github.com/Italink/UnrealClientProtocol/tree/main/Skills/unreal-object-operation into .cursor/skills/unreal-object-operation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "unreal-object-operation", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/Italink/UnrealClientProtocol.git --path Skills/unreal-object-operation

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add Italink/UnrealClientProtocol --skill unreal-object-operation -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install Italink/UnrealClientProtocol unreal-object-operation --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/Italink/UnrealClientProtocol.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/Skills/unreal-object-operation .gemini/skills/unreal-object-operation && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "unreal-object-operation" agent skill from https://github.com/Italink/UnrealClientProtocol/tree/main/Skills/unreal-object-operation into .gemini/skills/unreal-object-operation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "unreal-object-operation", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install Italink/UnrealClientProtocol unreal-object-operation

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add Italink/UnrealClientProtocol --skill unreal-object-operation -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/Italink/UnrealClientProtocol.git skills-src && mkdir -p .github/skills && cp -r skills-src/Skills/unreal-object-operation .github/skills/unreal-object-operation && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "unreal-object-operation" agent skill from https://github.com/Italink/UnrealClientProtocol/tree/main/Skills/unreal-object-operation into .github/skills/unreal-object-operation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "unreal-object-operation", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add Italink/UnrealClientProtocol --skill unreal-object-operation -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install Italink/UnrealClientProtocol unreal-object-operation --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/Italink/UnrealClientProtocol.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/Skills/unreal-object-operation .opencode/skills/unreal-object-operation && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "unreal-object-operation" agent skill from https://github.com/Italink/UnrealClientProtocol/tree/main/Skills/unreal-object-operation into .opencode/skills/unreal-object-operation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "unreal-object-operation", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: unreal-object-operation
GitHub stars: 127
Token cost: ~1.7k tokens
SKILL.md length: 455 words
Files: 1
Skills in repo: 24
Repo updated: Aug 28, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Read/write any UObject property (material settings, actor transforms, component configs, etc.), inspect object metadata, find instances, undo/redo.

Works in 3 steps: Make a call → response contains… → If the call produced an undesired… → If the top of the Undo stack is NOT your…
You need to get
SKILL.md covers Runtime, Editor Only, Property Value Formats and Safe Undo/Redo Pattern, plus 1 more section
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Unreal Object Operation is an agent skill from Italink/UnrealClientProtocol. Read/write any UObject property (material settings, actor transforms, component configs, etc.), inspect object metadata, find instances, undo/redo. This is the foundational skill for modifying ANY object in Unreal Engine — use it whenever you need to get or set a property on any UObject.

Its SKILL.md is about 1.7k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Game Development, covering Game development. It works with Unreal Engine. The repository describes itself as: Lightweight UE5 plugin that exposes Unreal Engine's reflection system over TCP+JSON — let AI agents call UFunctions, read/write UProperties, and inspect any UObject in a running… The licence is MIT.

When your agent uses it

You need to get
Set a property on any UObject

Example prompts

“/unreal-object-operation”

Workflow steps

3 steps, taken from the first numbered list in SKILL.md.

Make a call → response contains "id":"UCP-A1B2C3D4"
If the call produced an undesired result, undo it with UndoTransaction(Keyword="UCP-A1B2C3D4")
If the top of the Undo stack is NOT your operation (e.g. user did something manually), the undo will be rejected with an error showing the…

What it can do on your machine

Read from SKILL.md and the folder at commit 7f0a56e. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are json and mermaid).
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Unreal Object Operation loads about 1.7k tokens when it runs. Until then it costs about 78 tokens; SKILL.md has 455 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~78
When it runs · the whole SKILL.md, loaded when a task matches: ~1.7k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from Italink/UnrealClientProtocol at commit 7f0a56e, republished under its MIT licence (© Italink). 455 words, ~1,721 tokens.

Download SKILL.mdSave it as .claude/skills/unreal-object-operation/SKILL.md (or your agent's skills folder).

name: unreal-object-operation
description: Read/write any UObject property (material settings, actor transforms, component configs, etc.), inspect object metadata, find instances, undo/redo. This is the foundational skill for modifying ANY object in Unreal Engine — use it whenever you need to get or set a property on any UObject.

Unreal Object Operations

Operate on UObjects through UCP's call command. This skill covers two function libraries: one available at runtime and one editor-only.

Prerequisite: The unreal-client-protocol skill must be available and the UE editor must be running with the UCP plugin enabled.

Runtime

UObjectOperationLibrary

CDO Path: /Script/UnrealClientProtocol.Default__ObjectOperationLibrary

Function	Params	Description
`GetObjectProperty`	`ObjectPath`, `PropertyName`	Read a UPROPERTY, returns JSON with property value
`SetObjectProperty`	`ObjectPath`, `PropertyName`, `JsonValue`	Write a UPROPERTY (supports Undo in editor). JsonValue is a JSON string.
`DescribeObject`	`ObjectPath`	Returns class info, all properties (with current values), and all functions
`DescribeObjectProperty`	`ObjectPath`, `PropertyName`	Returns detailed property metadata and current value
`DescribeObjectFunction`	`ObjectPath`, `FunctionName`	Returns full function signature with parameter types
`FindObjectInstances`	`ClassName`, `Limit` (default 100)	Find UObject instances by class path
`FindDerivedClasses`	`ClassName`, `bRecursive` (default true), `Limit` (default 500)	Find all subclasses of a class
`ListComponents`	`ObjectPath`	List all components attached to an actor
`FindObjectsByOuter`	`OuterPath`, `ClassName` (default ""), `Limit` (default 100)	Find objects owned by a given outer object

Examples

Read a property:

json

{"object":"/Script/UnrealClientProtocol.Default__ObjectOperationLibrary","function":"GetObjectProperty","params":{"ObjectPath":"/Game/Maps/Main.Main:PersistentLevel.StaticMeshActor_0.StaticMeshComponent0","PropertyName":"RelativeLocation"}}

Write a property:

json

{"object":"/Script/UnrealClientProtocol.Default__ObjectOperationLibrary","function":"SetObjectProperty","params":{"ObjectPath":"/Game/Maps/Main.Main:PersistentLevel.StaticMeshActor_0.StaticMeshComponent0","PropertyName":"RelativeLocation","JsonValue":"{\"X\":100,\"Y\":200,\"Z\":0}"}}

Find instances:

json

{"object":"/Script/UnrealClientProtocol.Default__ObjectOperationLibrary","function":"FindObjectInstances","params":{"ClassName":"/Script/Engine.StaticMeshActor","Limit":50}}

Describe an unfamiliar object:

json

{"object":"/Script/UnrealClientProtocol.Default__ObjectOperationLibrary","function":"DescribeObject","params":{"ObjectPath":"/Game/Maps/Main.Main:PersistentLevel.BP_CustomActor_C_0"}}

List components on an actor:

json

{"object":"/Script/UnrealClientProtocol.Default__ObjectOperationLibrary","function":"ListComponents","params":{"ObjectPath":"/Game/Maps/Main.Main:PersistentLevel.StaticMeshActor_0"}}

Find objects by outer:

json

{"object":"/Script/UnrealClientProtocol.Default__ObjectOperationLibrary","function":"FindObjectsByOuter","params":{"OuterPath":"/Game/Maps/Main.Main:PersistentLevel","ClassName":"/Script/Engine.StaticMeshActor","Limit":50}}

Editor Only

UObjectEditorOperationLibrary

CDO Path: /Script/UnrealClientProtocolEditor.Default__ObjectEditorOperationLibrary

Function	Params	Description
`UndoTransaction`	`Keyword` (optional, default "")	Undo the last editor transaction. If Keyword is set, only undoes if the top transaction contains the keyword.
`RedoTransaction`	`Keyword` (optional, default "")	Redo the last undone transaction. If Keyword is set, only redoes if the top transaction contains the keyword.
`GetTransactionState`	(none)	Returns undo/redo stack state: canUndo, canRedo, undoTitle, redoTitle, undoCount, queueLength
`ForceReplaceReferences`	`ReplacementObjectPath`, `ObjectsToReplacePaths`	Redirect all references from the listed objects to the replacement object. `ObjectsToReplacePaths` is an array of strings.

Show full SKILL.md (189 more words)Show less

Examples

Get transaction state:

json

{"object":"/Script/UnrealClientProtocolEditor.Default__ObjectEditorOperationLibrary","function":"GetTransactionState"}

Undo last transaction (unconditional):

json

{"object":"/Script/UnrealClientProtocolEditor.Default__ObjectEditorOperationLibrary","function":"UndoTransaction"}

Safe undo (only if top transaction matches):

json

{"object":"/Script/UnrealClientProtocolEditor.Default__ObjectEditorOperationLibrary","function":"UndoTransaction","params":{"Keyword":"UCP-A1B2C3D4"}}

Force-replace references:

json

{"object":"/Script/UnrealClientProtocolEditor.Default__ObjectEditorOperationLibrary","function":"ForceReplaceReferences","params":{"ReplacementObjectPath":"/Game/Meshes/NewMesh.NewMesh","ObjectsToReplacePaths":["/Game/Meshes/OldMesh.OldMesh"]}}

Property Value Formats

When using SetObjectProperty, the JsonValue parameter is a JSON string:

FVector → "{\"X\":1,\"Y\":2,\"Z\":3}"
FRotator → "{\"Pitch\":0,\"Yaw\":90,\"Roll\":0}"
FLinearColor → "{\"R\":1,\"G\":0.5,\"B\":0,\"A\":1}"
FString → "\"hello\""
bool → "true" / "false"
float/int → "1.5" / "42"
UObject* → "\"/Game/Path/To/Asset.Asset\""

Safe Undo/Redo Pattern

Every UCP call returns an id field (e.g. "UCP-A1B2C3D4") that identifies the Undo transaction. Use this ID as the Keyword parameter when undoing to ensure you only undo your own operations:

Make a call → response contains "id":"UCP-A1B2C3D4"
If the call produced an undesired result, undo it with UndoTransaction(Keyword="UCP-A1B2C3D4")
If the top of the Undo stack is NOT your operation (e.g. user did something manually), the undo will be rejected with an error showing the actual top transaction title.

This prevents accidentally undoing user's manual edits.

When to use Keyword:

After a failed or undesired operation — pass the ID you just received
For "try and rollback" patterns — record ID, check result, undo if wrong

When to omit Keyword:

When the user explicitly asks to undo (they expect any undo)
When calling GetTransactionState to inspect the stack

Decision Flow

mermaid

flowchart TD
    A[User request about objects] --> B{Do I know the class and property/function?}
    B -->|YES| C[Build call directly from UE knowledge]
    B -->|NO| D[Call DescribeObject to discover API]
    D --> C
    C --> E[Execute via UCP]
    E --> F{Success?}
    F -->|YES| G[Done]
    F -->|NO| H[Read error + expected, fix and retry]
    H --> E

Files

Just SKILL.md in Skills/unreal-object-operation of Italink/UnrealClientProtocol.

Open the folder on GitHubat commit 7f0a56e

Compare with similar skills

Unreal Object Operation next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Unreal Object Operation compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Unreal Object Operation this skillItalink/UnrealClientProtocol	127	—	~1.7k	Automated safety check: Pass	MIT	1 mo ago
Unreal BridgeTornLux/UnrealBridge	306	—	~8.4k	Automated safety check: Notes	MIT	9 days ago
Unreal Blueprint Authoringflopperam/unreal-engine-mcp	1.1k	—	~1.6k	Automated safety check: Pass	None	3 mo ago
UMG Material MCPwinyunq/UnrealMotionGraphicsMCP	210	—	~913	Automated safety check: Pass	MIT	2 mo ago
Unreal Animation Bone Editorkevinpbuckley/VibeUE	730	—	~1.3k	Automated safety check: Pass	MIT	3 days ago
Unreal Engine MCPEpicGames/unreal-engine-skills-for-claude-code-plugin	338	—	~1.8k	Automated safety check: Pass	MIT	24 days ago

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Questions about Unreal Object Operation

What does Unreal Object Operation do?

Read/write any UObject property (material settings, actor transforms, component configs, etc.), inspect object metadata, find instances, undo/redo. Unreal Object Operation is an agent skill from Italink/UnrealClientProtocol.), inspect object metadata, find instances, undo/redo.

When should I use Unreal Object Operation?

Unreal Object Operation fits situations like: you need to get; set a property on any UObject.

How do I install Unreal Object Operation in Claude Code?

Run `npx skills add Italink/UnrealClientProtocol --skill unreal-object-operation -a claude-code`. Or copy the skill folder (Skills/unreal-object-operation in Italink/UnrealClientProtocol) into .claude/skills/unreal-object-operation in your project. Claude Code loads it when a task matches its description.

How do I install Unreal Object Operation in Codex?

Run `npx skills add Italink/UnrealClientProtocol --skill unreal-object-operation -a codex`. Or copy the skill folder (Skills/unreal-object-operation in Italink/UnrealClientProtocol) into .agents/skills/unreal-object-operation in your project. Codex loads it when a task matches its description.

Can I use Unreal Object Operation in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add Italink/UnrealClientProtocol --skill unreal-object-operation -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/unreal-object-operation, .gemini/skills/unreal-object-operation, .github/skills/unreal-object-operation and .opencode/skills/unreal-object-operation in your project.

What does Unreal Object Operation need to run?

SKILL.md names no scripts, command-line tools or credentials: Unreal Object Operation is instructions for the agent only.

Does Unreal Object Operation access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Unreal Object Operation safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Unreal Object Operation use?

Unreal Object Operation is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Unreal Object Operation use?

About 1.7k tokens (SKILL.md is roughly 6.9k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Unreal Object Operation?

Skills that share tags, products or a category with Unreal Object Operation: Unreal Bridge (TornLux/UnrealBridge, 306 stars), Unreal Blueprint Authoring (flopperam/unreal-engine-mcp, 1.1k stars), UMG Material MCP (winyunq/UnrealMotionGraphicsMCP, 210 stars) and Unreal Animation Bone Editor (kevinpbuckley/VibeUE, 730 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Unreal Object Operation?

Italink (a GitHub user) maintains it in Italink/UnrealClientProtocol, which has 127 GitHub stars. The repository holds 24 skills in this directory. The repository was last updated on August 28, 2026.

Source: Italink/UnrealClientProtocol on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Unreal Object Operation

Facts

At a glance

What it does

When your agent uses it

Example prompts

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Unreal Object Operations

Runtime

UObjectOperationLibrary

Examples

Editor Only

UObjectEditorOperationLibrary

Examples

Property Value Formats

Safe Undo/Redo Pattern

Decision Flow

Files

Compare with similar skills

Similar skills

More from Italink/UnrealClientProtocol

Related

Questions about Unreal Object Operation