Set an EditorPrefs value. Specify type: string (default), int, float, bool.
AI agents use unity_editorprefs_set to create or update resources in Unity MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Unity MCP Server environment.
This tool modifies editor preferences reversibly—settings can be changed back or reset. It creates or updates configuration data rather than executing arbitrary code or deleting data. While it could affect editor behavior or project configuration, the changes are not destructive and can be undone, placing it in the Write category.
From the tool's definition Tool name contains 'set' and description states 'Set an EditorPrefs value'; EditorPrefs are persistent configuration settings in Unity that modify editor behavior and project state.
Documented attack patterns abuse exactly the kind of access unity_editorprefs_set gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Unity MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for unity_editorprefs_set:
{
"version": "1",
"default": "deny",
"tools": {
"unity_editorprefs_set": {
"limits": [
{
"counter": "unity_editorprefs_set_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}unity_editorprefs_set 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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Set an EditorPrefs value. Specify type: string (default), int, float, bool. It is categorised as a Write tool in the Unity MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Unity MCP Server MCP server in PolicyLayer and add a rule for unity_editorprefs_set: 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 Unity MCP Server. Nothing to install.
unity_editorprefs_set 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 unity_editorprefs_set 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 unity_editorprefs_set. 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.
unity_editorprefs_set is provided by the Unity MCP Server MCP server (anklebreaker-studio/unity-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 324 Unity MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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324 Unity MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.