AI agents use script_create to create or update resources in MCP Server for Unity — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your MCP Server for Unity environment.
This tool creates (writes) new scripts, which modifies project state reversibly. While code execution within Unity could theoretically occur, the tool's primary function is file creation, not execution.
From the tool's definition Tool name 'script_create' and description 'Create a new C# script in Unity project' indicate creation of new code files in a project.
Documented attack patterns abuse exactly the kind of access script_create gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and MCP Server for Unity, and nothing reaches the server without passing your rules. This is the rule we recommend for script_create:
{
"version": "1",
"default": "deny",
"tools": {
"script_create": {
"limits": [
{
"counter": "script_create_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}script_create stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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Create a new C# script in Unity project. It is categorised as a Write tool in the MCP Server for Unity MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the MCP Server for Unity MCP server in PolicyLayer and add a rule for script_create: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches MCP Server for Unity. Nothing to install.
script_create is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the script_create rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for script_create. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
script_create is provided by the MCP Server for Unity MCP server (zabaglione/mcp-server-unity). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from MCP Server for Unity, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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15 MCP Server for Unity tools catalogued and risk-classified — across an index of 43,000+ MCP servers.