What is unreal-bridge?

A bridge for running Python code inside a running Unreal Engine 5.3 or newer editor through a network connection.

Use it to query scenes, manipulate assets, automate editor tasks, or run Python scripts in Unreal Engine.

It lets an agent interact with the editor directly instead of requiring each asset or scene change to be performed manually.

How TornLux/UnrealBridge configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to TornLux/UnrealBridge. 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/TornLux/UnrealBridge/main/.claude/skills/unreal-bridge/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/TornLux/UnrealBridge

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/tornlux/unrealbridge/unreal-bridge/github.svg)](https://agentmods.dev/skills/tornlux/unrealbridge/unreal-bridge)

Your own site

<a href="https://agentmods.dev/skills/tornlux/unrealbridge/unreal-bridge"><img src="https://agentmods.dev/badge/skills/tornlux/unrealbridge/unreal-bridge/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/tornlux/unrealbridge/unreal-bridge"><img src="https://agentmods.dev/badge/skills/tornlux/unrealbridge/unreal-bridge.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 48 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 8,102 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. Third-party audits

NVIDIA SkillSpector pass 7 Sept 2026

How audits are shown

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.

Model	Per session	Once invoked
Fable 5.1	$0.00048	$0.08102
Opus 5	$0.00024	$0.04051
Sonnet 5	$0.00010	$0.01620
Haiku 4.5	$0.00005	$0.00810

Measured 12d ago against content hash 98f5b450632b, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

unreal-bridge 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 12d ago.

The scan reads SKILL.md. This mod also ships 8 executable files (scripts/_project_sync.py, scripts/audit_tech_debt.py, scripts/bridge_discovery.py, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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/skills/unreal-bridge/SKILL.md · 393 lines

How it starts

The opening of the file, as written. The whole thing — 393 lines — stays where its author put it; the contents beside it link to each section on GitHub.

UnrealBridge

Execute Python directly inside a running UE 5.3+ editor. Protocol-v2 auto-discovery defaults to paired host-local UDP probes: multicast 239.255.42.99:9876 with TTL 0 plus loopback 127.0.0.1:9876. Use --discovery-scope=lan only when another host must be discovered; it raises multicast TTL to 1 while retaining loopback. Malformed replies and Windows UDP reset notifications are skipped independently, valid responses are de-duplicated by Server-start UUID, and wildcard binds use the UDP response source IP. The six pre-existing exact commands remain the minimum capability set; exact_editor_status is advertised and negotiated separately, so an older protocol-v2 endpoint remains usable for its supported base commands. Unique future capabilities remain forward-compatible. Every bounded TCP response is rechecked against the frozen identity. The TCP data port is OS-assigned per editor.

Preconditions

If bridge.py returns discovery: no UnrealBridge editors found, walk these in order — don't troubleshoot Python or firewalls first:

Plugin and matching skill installed with sync_project.bat <UEProjectRoot>. Check: <UEProject>/Plugins/UnrealBridge/UnrealBridge.uplugin exists. The legacy sync_plugin.bat command name accepts the same project-root argument.
Plugin enabled — check <UEProject>/<Project>.uproject "Plugins" block for {"Name":"UnrealBridge", "Enabled":false} and flip if present.
Editor up and ready — bridge.py ping returns "ready": true. false means MainFrame still loading; wait 10–60s.

The loopback probe keeps local discovery working when multicast is blocked by a VPN, virtual NIC, or Windows firewall policy. The discovery group must be an IPv4 multicast address; direct unicast mode is intentionally fail-closed: --endpoint, --instance-id, --expected-pid, and --expected-project-path (or matching UNREAL_BRIDGE_* variables) are one inseparable tuple. Copy the identity values verbatim from one discovery response or Server startup line; project_path is case- and representation-sensitive on every OS. A host/port alone can be stale and is never used as a legacy fallback. Python 3.7+ stdlib only.

Read the full file on GitHub · 393 lines

Files

What ships with it

41 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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.

12d ago First seen · 393 lines · 48 tokens per session scan A 98f5b450632b

Subscribe to this mod's changes

unreal-bridge is a skill published in the GitHub repository TornLux/UnrealBridge (302 stars, last pushed 8d ago), licensed MIT. It adds 48 tokens to every session and 8,102 once invoked, about $0.0002 per session on Opus 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.

Game development

gameobject-component-destroy

Destroy one or more Components from a target GameObject. Missing (null) components are skipped — they cannot be destroyed. Use 'gameobject-find' and 'gameobject-component-get' to identify the components first.

IvanMurzak/Unity-MCP · 49 tokens

unity-version-split

Split a C# file into Unity 6.5+ and pre-Unity 6.5 variants. Use when a file needs different implementations for different Unity versions due to API changes (e.g., EntityId vs int, GetEntityId vs GetInstanceID).

IvanMurzak/Unity-MCP · 59 tokens

godot-signals-groups

Build event-driven, decoupled Godot 4.7 gameplay with signals and node groups: declare and emit custom signals, connect with Callables (incl. bind/one-shot), and broadcast to many nodes via groups and callgroup. Use when wiring node communication in a Godot project, replacing tight references with signals…

gamedev-skills/awesome-gamedev-agent-skills · 95 tokens

UnrealBridge: Skill for Claude Code