Place trees on the terrain. Supports random scatter over an area or manual positions. Scatter mode supports steepness and altitude filtering.
AI agents use unity_terrain_place_trees 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.
The tool modifies scene data by adding terrain objects (trees), making it a Write operation. It's not Destructive because placements can be undone/removed. It's not Execute because it doesn't run arbitrary code or shell commands—it performs a scoped terrain modification. Severity is medium because misuse could clutter the scene or consume resources, but the impact is confined to the current project and reversible.
From the tool's definition Tool performs 'place trees on the terrain' which creates new objects in the Unity scene. This is a reversible modification operation that alters the terrain state but does not execute arbitrary code, delete data, or cause financial impact.
Documented attack patterns abuse exactly the kind of access unity_terrain_place_trees 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_place_trees:
{
"version": "1",
"default": "deny",
"tools": {
"unity_terrain_place_trees": {
"limits": [
{
"counter": "unity_terrain_place_trees_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}unity_terrain_place_trees 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.
Place trees on the terrain. Supports random scatter over an area or manual positions. Scatter mode supports steepness and altitude filtering. 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_place_trees: 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_place_trees 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_place_trees 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_place_trees. 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_place_trees 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.