unity_terrain_fill_layer

Fill the entire terrain with a single texture layer (sets that layer to 100% everywhere).

SERVERUnity MCP Server SOURCEanklebreaker-studio/unity-mcp-server

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/anklebreaker-studio-unity-mcp-server/unity-terrain-fill-layer.md

WHAT IT DOES

What unity_terrain_fill_layer does on Unity MCP Server

AI agents use unity_terrain_fill_layer 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.

RISK

Why unity_terrain_fill_layer is rated Medium

This tool creates/modifies terrain data irreversibly by overwriting texture layer weights across the entire terrain. While the operation is theoretically reversible (undo/revert), it represents a significant Write action affecting large-scale scene state.

From the tool's definition Tool description states 'Fill the entire terrain with a single texture layer (sets that layer to 100% everywhere)' — this modifies terrain data across the entire scene by changing texture layer weights.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs unity_terrain_fill_layer safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Unity MCP Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For unity_terrain_fill_layer, this is the rule to start with:

unity_terrain_fill_layer Rate-limited

unity_terrain_fill_layer 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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "unity_terrain_fill_layer": {
      "limits": [
        {
          "counter": "unity_terrain_fill_layer_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Unity MCP Server, apply this rule, and every unity_terrain_fill_layer call is checked against it from then on.

FAQ

Questions about unity_terrain_fill_layer

What does the unity_terrain_fill_layer tool do? +

Fill the entire terrain with a single texture layer (sets that layer to 100% everywhere). 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.

How do I enforce a policy on unity_terrain_fill_layer? +

Register the Unity MCP Server MCP server in PolicyLayer and add a rule for unity_terrain_fill_layer: 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.

What risk level is unity_terrain_fill_layer? +

unity_terrain_fill_layer is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit unity_terrain_fill_layer? +

Yes. Add a rate_limit block to the unity_terrain_fill_layer 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.

How do I block unity_terrain_fill_layer completely? +

Set action: deny in the PolicyLayer policy for unity_terrain_fill_layer. 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.

What MCP server provides unity_terrain_fill_layer? +

unity_terrain_fill_layer 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.

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