list_graph_nodes

List all nodes in a Blueprint's event graph.

SERVERUnreal SOURCE@jjpxdev/unreal-mcp

Low RISK CLASS

Category Read

Parameters 11 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/jjpxdev-unreal-mcp/list-graph-nodes.md

WHAT IT DOES

What list_graph_nodes does on Unreal

AI agents call list_graph_nodes to retrieve information from Unreal without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

Parameter	Type	Required	Description
`blueprint_path`	string	Yes	Blueprint asset path

Parameters from the server's own tool schema.

RISK

Why list_graph_nodes is rated Low

Even though list_graph_nodes only reads data, uncontrolled read access leaks sensitive information and racks up API costs: an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs list_graph_nodes safely

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

list_graph_nodes Allowed

list_graph_nodes is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "list_graph_nodes": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

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

FAQ

Questions about list_graph_nodes

What does the list_graph_nodes tool do? +

List all nodes in a Blueprint's event graph. It is categorised as a Read tool in the Unreal MCP Server, which means it retrieves data without modifying state.

What parameters does list_graph_nodes accept? +

list_graph_nodes accepts 1 parameter: blueprint_path. Required: blueprint_path. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on list_graph_nodes? +

Register the Unreal MCP server in PolicyLayer and add a rule for list_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 list_graph_nodes? +

list_graph_nodes is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit list_graph_nodes? +

Yes. Add a rate_limit block to the list_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 list_graph_nodes completely? +

Set action: deny in the PolicyLayer policy for list_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 list_graph_nodes? +

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

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