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.
npx skills add AlexeyPerov/Unity-Open-MCP --skill inputsystemgit clone --depth 1 https://github.com/AlexeyPerov/Unity-Open-MCPWrote 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/alexeyperov/unity-open-mcp/inputsystem)<a href="https://agentmods.dev/skills/alexeyperov/unity-open-mcp/inputsystem"><img src="https://agentmods.dev/badge/skills/alexeyperov/unity-open-mcp/inputsystem/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/alexeyperov/unity-open-mcp/inputsystem"><img src="https://agentmods.dev/badge/skills/alexeyperov/unity-open-mcp/inputsystem.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00000 | $0.01768 |
| Opus 5.5 | $0.00000 | $0.00707 |
| Sonnet 5.5 | $0.00000 | $0.00354 |
| Haiku 4.5 | $0.00000 | $0.00177 |
Grade A, and why
inputsystem 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 1mo 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 — 119 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Unity Open MCP — Input System Extension
Skill for AI agents driving the Unity Input System in a project through the unity-open-mcp MCP server.
This domain is embedded in the bridge and opt-in. Its tools compile in only when the project has
com.unity.inputsysteminstalled (the bridge sets theUNITY_OPEN_MCP_EXT_INPUTSYSTEMdefine automatically). Its tool group is hidden fromListToolsuntil the connected session activates it.
Preconditions
- Unity Editor is open with the target project.
unity_open_mcp_pingreturnsconnected: true.- The project has
com.unity.inputsysteminstalled. Ifcapabilitiesreports theinput-systemgroup asavailable: false, install the package and let the bridge recompile. - The
input-systemtool group is activated — callunity_open_mcp_manage_tools(action="activate", group="input-system")before invoking anyinputsystem_*tool. Fresh sessions start with two default-on groups (coreandgate-and-verify); activate the other groups you need on demand. - The Unity project has
com.unity.inputsystemavailable. ProjectSettings/ProjectSettings.assethasactiveInputHandlerset to a valid value:0(Old Input Manager),1(Input System only), or2(Both). A value of-1(Unity's "not configured" sentinel) makes the Input System throwArgumentException: Invalid value of 'activeInputHandler' setting: -1in its static constructor on every editor update, which blocks the bridge from loading. If you see that exception inread_compile_errors/ the console, setactiveInputHandler: 2directly in the asset file (or usesettings_set_playerwithactiveInputHandling: "both"once the bridge is up).
Tool prefix
All tools in this pack use unity_open_mcp_inputsystem_*. Mutating tools target a .inputactions asset path — every mutator runs the full gate path with paths_hint scoped to that asset; the read-only tool (inputsystem_get) is gate-free.
What is an InputActionAsset?
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.
- 1mo ago First seen · 119 lines · 0 tokens per session scan A 0fc4e8fe78d8
inputsystem is a skill published in the GitHub repository AlexeyPerov/Unity-Open-MCP (17 stars, last pushed 14d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 1,768 tokens. 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.
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