Import a heightmap from a RAW file or texture asset into the terrain.
AI agents use unity_terrain_import_heightmap 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 creates or modifies terrain geometry by importing heightmap data, which is a reversible write operation. It does not execute arbitrary code, delete data irreversibly, or move money. While it affects game assets, the operation can be undone through normal version control or re-importing.
From the tool's definition Tool name includes 'import' and description states 'Import a heightmap from a RAW file or texture asset into the terrain' — this modifies terrain data by ingesting external heightmap sources.
Documented attack patterns abuse exactly the kind of access unity_terrain_import_heightmap 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_import_heightmap:
{
"version": "1",
"default": "deny",
"tools": {
"unity_terrain_import_heightmap": {
"limits": [
{
"counter": "unity_terrain_import_heightmap_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}unity_terrain_import_heightmap 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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Import a heightmap from a RAW file or texture asset into the 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_import_heightmap: 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_import_heightmap 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_import_heightmap 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_import_heightmap. 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_import_heightmap 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.