Borrowing it
Nothing to install: this file belongs to Signal-Loop/UnityCodeMCPServer. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/Signal-Loop/UnityCodeMCPServer/main/.agents/skills/unity-game-player/SKILL.mdgit clone --depth 1 https://github.com/Signal-Loop/UnityCodeMCPServerWrote 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.
[](https://agentmods.dev/skills/signal-loop/unitycodemcpserver/unity-game-player)<a href="https://agentmods.dev/skills/signal-loop/unitycodemcpserver/unity-game-player"><img src="https://agentmods.dev/badge/skills/signal-loop/unitycodemcpserver/unity-game-player/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.
<a href="https://agentmods.dev/skills/signal-loop/unitycodemcpserver/unity-game-player"><img src="https://agentmods.dev/badge/skills/signal-loop/unitycodemcpserver/unity-game-player.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Prompt Injection · line 51 Large whitespace padding was detected (a block of blank lines or a long run of spaces). This can push injected instructions below or to the right of the visible area so a human reviewer never sees them while the agent still reads them. Manual review of the hidden content is recommended.Fix: Remove the large whitespace padding (blank-line blocks or long space runs) and review any content hidden below or to the right of it. Keep skill files compact and reviewable so no instructions can be
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 | $0.00118 | $0.02422 |
| Opus 5.5 | $0.00047 | $0.00969 |
| Sonnet 5.5 | $0.00024 | $0.00484 |
| Haiku 4.5 | $0.00012 | $0.00242 |
Grade A, and why
unity-game-player 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.
How it starts
The opening of the file, as written. The whole thing — 244 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Unity Game Player
Skill for AI agents that play Unity games autonomously in the Editor via MCP tools.
Table of Contents
- Prerequisites
- Available Tools
- Core Loop Overview
- Phase 0 — INIT
- Phases 1+2 — SENSE + COMPUTE
- Phase 3 — ACT
- Phase 4 — REPEAT
- Critical Rules
- Common Pitfalls
For detailed tool API parameters and trajectory math patterns, see:
1. Prerequisites
- Unity Editor must be running and the project open.
- Read
executing-csharp-scripts-in-unity-editorskill - it is critical to properly play Unity games in the Editor. - The game scene must be loaded.
- Call
enter_play_modeonce before starting the loop. This enters Play Mode withTime.timeScale = 0(paused). - All subsequent gameplay is driven by
play_unity_game, which temporarily setstimeScale = 1for the requested duration, then re-pauses.
2. Available Tools
The executing-csharp-scripts-in-unity-editor skill is essential to properly execute C# scripts in the Unity Editor. It must be read before using the execute_csharp_script_in_unity_editor tool.
| Tool | Purpose |
|---|---|
enter_play_mode |
Enter Play Mode (paused). Call once at start. |
play_unity_game |
Unpause for N ms, simulate inputs, capture console logs. |
execute_csharp_script_in_unity_editor |
Run C# in the Editor to query/modify scene state. Read executing-csharp-scripts-in-unity-editor skill before use. |
read_unity_console_logs |
Read recent console entries (use sparingly — prefer logs from tool output). |
exit_play_mode |
Leave Play Mode. Call only when done. |
get_unity_info |
Query Unity version, project path, scene list. |
What ships with it
2 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.
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 · 244 lines · 118 tokens per session scan A 62543ea30a1a
unity-game-player is a skill published in the GitHub repository Signal-Loop/UnityCodeMCPServer (20 stars, last pushed 2mo ago), licensed MIT. It adds 118 tokens to every session and 2,422 once invoked, about $0.0005 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.
unity-game-player compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| unity-game-playerSignal-Loop/UnityCodeMCPServer | Skill | 20 | 2mo ago | MIT | A | 118 | Claude Code, Codex |
| steam-mcpsandraschi/steam-mcp | Skill | 3 | today | MIT | A | 0 | Claude Code, Codex |
| weppy-roblox-game-presentation-guidehope1026/weppy-roblox-mcp | Skill | 74 | 5d ago | none | A | 57 | Claude Code, Codex |
| weppy-roblox-game-feel-guidehope1026/weppy-roblox-mcp | Skill | 74 | 5d ago | none | A | 65 | Claude Code, Codex |
| weppy-roblox-environment-guidehope1026/weppy-roblox-mcp | Skill | 74 | 5d ago | none | A | 52 | Claude Code, Codex |
| weppy-roblox-mcp-guidehope1026/weppy-roblox-mcp | Skill | 74 | 5d ago | none | A | 53 | Claude Code, Codex |
| weppy-roblox-sync-guidehope1026/weppy-roblox-mcp | Skill | 74 | 5d ago | none | A | 54 | Claude Code, Codex |