Create a UI Canvas with an EventSystem. Render modes:
AI agents use unity_ui_create_canvas 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 new UI elements (Canvas and EventSystem) in a Unity scene, which is a reversible write operation. It modifies the project state by adding new objects but does not execute arbitrary code, delete data, or move financial resources. The blast radius is medium because incorrect canvas creation could require manual cleanup but wouldn't cause data loss or system-level damage.
From the tool's definition Tool name 'unity_ui_create_canvas' and description indicate creation of a UI Canvas with EventSystem in a Unity project. The verb 'create' and the context of adding new game objects to a scene demonstrates data creation.
Documented attack patterns abuse exactly the kind of access unity_ui_create_canvas 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_ui_create_canvas:
{
"version": "1",
"default": "deny",
"tools": {
"unity_ui_create_canvas": {
"limits": [
{
"counter": "unity_ui_create_canvas_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}unity_ui_create_canvas 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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Create a UI Canvas with an EventSystem. Render modes:. 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_ui_create_canvas: 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_ui_create_canvas 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_ui_create_canvas 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_ui_create_canvas. 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_ui_create_canvas 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.