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mcp-unreal: Agent for Claude Code

.claude/agents/ue-plugin-developer.md

ue-plugin-developer is an agent for Claude Code from remiphilippe/mcp-unreal. It costs 46 tokens per session (281 once invoked), scanned A, original, Apache-2.0.

A coding guide for C++ work on an Unreal Engine editor plugin. Unreal Engine is a game-development platform, and this guide covers its version 5.7 editor APIs and Blueprint visual scripting graphs.

In plain words
What is it for?
Use it when adding or changing plugin features such as actor operations, Blueprint graph edits, asset searches, console commands, or HTTP routes.
Why use it?
It gives the agent project-specific rules for changing Unreal objects safely, handling JSON requests, and keeping work on the correct game thread.

Agent for Claude Code

Written for Claude Code: installed under .claude/. Also seen: model in frontmatter.

This is remiphilippe/mcp-unreal's own configuration. It tells Claude Code how to work on mcp-unreal itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything mcp-unreal configures →

not rated 81repo +1 8mo ago A scan 46 tokens original Apache-2.0
View source ↗ remiphilippe/mcp-unreal
Reuse

Borrowing it

Nothing to install: this file belongs to remiphilippe/mcp-unreal. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/remiphilippe/mcp-unreal/main/.claude/agents/ue-plugin-developer.md
Clone the repo
git clone --depth 1 https://github.com/remiphilippe/mcp-unreal

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

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README.md
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Your own site
<a href="https://agentmods.dev/agents/remiphilippe/mcp-unreal/ue-plugin-developer"><img src="https://agentmods.dev/badge/agents/remiphilippe/mcp-unreal/ue-plugin-developer/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

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Your own site · 80×15
<a href="https://agentmods.dev/agents/remiphilippe/mcp-unreal/ue-plugin-developer"><img src="https://agentmods.dev/badge/agents/remiphilippe/mcp-unreal/ue-plugin-developer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 46 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 281 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00046 $0.00281
Opus 5.5 $0.00018 $0.00112
Sonnet 5.5 $0.00009 $0.00056
Haiku 4.5 $0.00005 $0.00028

Measured 2mo ago against content hash 79b11fb390a5, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

ue-plugin-developer scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.claude/agents/ue-plugin-developer.md · 29 lines

What it actually says

You are an expert Unreal Engine 5.7 C++ plugin developer.

Follow Epic's coding standards:

  • U prefix for UObject, A for Actor, F for structs, E for enums
  • GENERATED_BODY() in all UCLASS/USTRUCT
  • No raw new/delete — use NewObject, CreateDefaultSubobject
  • Log category: LogMCPUnreal

The plugin uses FHttpServerModule (built-in since UE 4.25) on port 8090. All route handlers must:

  1. Parse and validate JSON input before acting
  2. Return structured JSON responses
  3. Run on the game thread when touching UE objects (use AsyncTask(ENamedThreads::GameThread, ...))

Key subsystems to use:

  • UEditorActorSubsystem for actor operations
  • FBlueprintEditorUtils + FKismetEditorUtilities for Blueprint graph editing
  • FAssetRegistryModule for asset queries
  • GEngine->Exec() for console commands

Conditionally compile RealtimeMesh support: #if WITH_REALTIMEMESH

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2mo ago First seen · 29 lines · 46 tokens per session scan A 79b11fb390a5

Subscribe to this mod's changes

ue-plugin-developer is an agent published in the GitHub repository remiphilippe/mcp-unreal (81 stars, last pushed 8mo ago), licensed Apache-2.0. It adds 46 tokens to every session and 281 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

C and C++Game developmentLanguagesmcp-serverunreal-engineunreal-engine-5
Related

ue-plugin-developer compared with agents from other repositories

ue-plugin-developer next to 6 agents from other repositories
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ue-plugin-developerremiphilippe/mcp-unrealAgent818mo agoApache-2.0A46Claude Code
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godot-gdextension-specialistIdoCohen560/claude-unity-game-studioAgent274mo agoMITA76Claude Code
godot-gdextension-specialistTraftG/opencode-game-studioAgent496mo agoMITA68Claude Code, OpenCode