AI agents call get_udt to retrieve information from Ignition without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool performs read-only retrieval of UDT (User Defined Type) definitions and their properties. There are no side effects, no data modification, no code execution, and no destructive operations. It is purely a query/fetch operation to inspect SCADA project structure. The severity is low because reading metadata poses minimal risk compared to execution or destructive operations.
From the tool's definition Tool name 'get_udt' and description 'Get UDT definition(s) with member details' indicate retrieval of User Defined Type metadata and structural information without modification or execution.
Attacks that exploit this kind of access
Get UDT definition(s) with member details. It is categorised as a Read tool in the Ignition MCP Server, which means it retrieves data without modifying state.
Register the Ignition MCP server in PolicyLayer and add a rule for get_udt: 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 Ignition. Nothing to install.
get_udt is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the get_udt 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 get_udt. 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.
get_udt is provided by the Ignition MCP server (nodeblue-ai/ignition-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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