connect_graph_nodes · Unreal MCP: Risk & Policy

WHAT IT DOES

What connect_graph_nodes does on Unreal

AI agents use connect_graph_nodes to create or update resources in Unreal — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Unreal environment.

WHY IT NEEDS A POLICY

Why connect_graph_nodes needs a policy

This tool modifies blueprint graph structure by creating connections between nodes, which is a reversible write operation. It doesn't execute code, delete data, or involve financial transactions.

From the tool's definition Tool description states it will "Wire two node pins together in a Blueprint graph" - this creates/modifies graph connections in Unreal Engine blueprints.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

connect_graph_nodes Rate-limited

connect_graph_nodes 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": {
    "connect_graph_nodes": {
      "limits": [
        {
          "counter": "connect_graph_nodes_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Unreal, so you can run agents against it safely.

FAQ

Questions about connect_graph_nodes

What does the connect_graph_nodes tool do? +

Wire two node pins together in a Blueprint graph. Requires the optional C++ plugin. It is categorised as a Write tool in the Unreal MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on connect_graph_nodes? +

Register the Unreal MCP server in PolicyLayer and add a rule for connect_graph_nodes: 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 Unreal. Nothing to install.

What risk level is connect_graph_nodes? +

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

Can I rate-limit connect_graph_nodes? +

Yes. Add a rate_limit block to the connect_graph_nodes 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 connect_graph_nodes completely? +

Set action: deny in the PolicyLayer policy for connect_graph_nodes. 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 connect_graph_nodes? +

connect_graph_nodes is provided by the Unreal MCP server (sam-david/unreal-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.