This record as markdown: /tools/jjpxdev-unreal-mcp/create-blueprint.md
What create_blueprint does on Unreal
AI agents use create_blueprint 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.
| Parameter | Type | Required | Description |
|---|---|---|---|
name | string | Yes | Blueprint asset name |
path | string | — | Content directory to create in |
parent_class | string | — | Parent class (e.g., Actor, Character, Pawn, PlayerController) |
Parameters from the server's own tool schema.
Why create_blueprint is rated Medium
This tool falls under the Write category because it creates and persists a new Blueprint asset in the Unreal Engine project—a reversible but significant modification. It does not execute arbitrary code or delete data (which would be Execute or Destructive).
From the tool's definition The tool 'create_blueprint' creates a new Blueprint class in Unreal Engine. The description explicitly states 'Create a new Blueprint class,' which is a create operation that modifies the project state by adding a new asset.
Risk signalsAccepts file system path (path)
Attacks that exploit this kind of access
The rule that runs create_blueprint 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 create_blueprint, this is the rule to start with:
create_blueprint 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.
The button opens the PolicyLayer dashboard: create your workspace, connect Unreal, apply this rule, and every create_blueprint call is checked against it from then on.
Questions about create_blueprint
Create a new Blueprint class. 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.
create_blueprint accepts 3 parameters: name, path, parent_class. Required: name. The full parameter table on this page comes from the server's own tool schema.
Register the Unreal MCP server in PolicyLayer and add a rule for create_blueprint: 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.
create_blueprint 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 create_blueprint 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 create_blueprint. 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.
create_blueprint 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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