Apply Perlin noise to the entire terrain heightmap. Great for generating natural-looking terrain.
AI agents use unity_terrain_noise 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 game world data (terrain heightmap) in a way that changes the scene permanently during that session. While technically reversible (undo can be used in Unity Editor), the tool itself performs a write operation that alters asset state. This is categorized as Write rather than Execute because it performs a specific, bounded operation (apply noise) rather than arbitrary code execution.
From the tool's definition Tool applies noise to 'the entire terrain heightmap', which modifies terrain data. The description indicates this creates or transforms terrain geometry rather than merely reading it.
Risk signalsBulk/mass operation — affects multiple targets
Documented attack patterns abuse exactly the kind of access unity_terrain_noise 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_terrain_noise:
{
"version": "1",
"default": "deny",
"tools": {
"unity_terrain_noise": {
"limits": [
{
"counter": "unity_terrain_noise_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}unity_terrain_noise 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.
Free to start. No card required.
Apply Perlin noise to the entire terrain heightmap. Great for generating natural-looking terrain. 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_terrain_noise: 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_terrain_noise 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_terrain_noise 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_terrain_noise. 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_terrain_noise 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.
Free to start. No card required.
324 Unity MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.