Instructions for using MCP Unity to inspect, test, and control a Unity Editor project. Unity Editor is the application used to build and manage Unity games and interactive experiences.

Use them to inspect scenes, edit Unity UI, click controls, run tests and menu actions, recompile scripts, and check console errors.

They provide a defined way to work with scenes, game objects, components, tests, and interface controls.

unity-mcp — Skill for Claude Code and Codex by st-VALVe/mcp-unity

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add st-VALVe/mcp-unity --skill unity-mcp

Clone the repo

git clone --depth 1 https://github.com/st-VALVe/mcp-unity

Made for: Claude Code, Codex.

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/st-valve/mcp-unity/unity-mcp/github.svg)](https://agentmods.dev/skills/st-valve/mcp-unity/unity-mcp)

Your own site

<a href="https://agentmods.dev/skills/st-valve/mcp-unity/unity-mcp"><img src="https://agentmods.dev/badge/skills/st-valve/mcp-unity/unity-mcp/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/st-valve/mcp-unity/unity-mcp"><img src="https://agentmods.dev/badge/skills/st-valve/mcp-unity/unity-mcp.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 40 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 290 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.

Model	Per session	Once invoked
Fable 5.1	$0.00040	$0.00290
Opus 5.5	$0.00016	$0.00116
Sonnet 5.5	$0.00008	$0.00058
Haiku 4.5	$0.00004	$0.00029

Measured 2mo ago against content hash fb661e18dec4, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

unity-mcp 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.

.codex-plugin/skills/unity-mcp/SKILL.md · 21 lines

What it actually says

Unity MCP

Use MCP Unity when Unity Editor is open for the target project and the user asks to inspect or manipulate the Unity scene, run Unity tests, execute Unity menu items, or interact with in-game UI.

Prefer direct MCP tools over OS-level clicking. For UI flows, use:

get_scene_info and get_gameobject to locate active canvases, popups, buttons, inputs, and ScrollRects.
set_ui_input_text for uGUI/TMP input and text components.
scroll_ui for ScrollRect-backed pickers and lists.
click_ui for Button, Toggle, and other EventSystem-clickable targets.
invoke_component_method only when a UI control is custom and the public event path is not enough.

For date-of-birth pickers, first look for an input/text receiver component or ScrollRect selectors. Set the value with set_ui_input_text or invoke_component_method if the component owns a date-selection callback, then use click_ui on the continue/confirm button.

After changing project scripts or MCP package files, run recompile_scripts and check get_console_logs for compile errors.

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.

2mo ago First seen · 21 lines · 40 tokens per session scan A fb661e18dec4

Subscribe to this mod's changes

unity-mcp is a skill published in the GitHub repository st-VALVe/mcp-unity (10 stars, last pushed 5mo ago), licensed MIT. It adds 40 tokens to every session and 290 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 2026-08-31.

Game development

unity-mcp next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
unity-mcpst-VALVe/mcp-unity	Skill	10	5mo ago	MIT	A	40	Claude Code, Codex
playtest-reportDonchitos/Claude-Code-Game-Studios	Skill	36k	19d ago	MIT	A	20	Claude Code
godot-signals-groupsgamedev-skills/awesome-gamedev-agent-skills	Skill	6.9k	10d ago	Apache-2.0	A	95	Claude Code
scenario-unreal-gameplayscenario-labs/skills	Skill	3.2k	yesterday	MIT	A	121	Claude Code
motionOpenDCAI/GameFactory-3A	Skill	1.0k	8d ago	Apache-2.0	A	0	Claude Code, Codex
unity-addressablesBesty0728/Unity-Skills	Skill	1.9k	yesterday	MIT	A	25	Claude Code, Codex
unity-manual-componentBesty0728/Unity-Skills	Skill	1.9k	yesterday	MIT	A	36	Claude Code, Codex