AI agents call list_udts 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.
This tool retrieves metadata about User Defined Types in an Ignition SCADA project. It performs a query operation that returns information without modifying, executing, or deleting any data. The blast radius of misuse is minimal—an agent listing UDTs gains visibility into project structure but cannot alter configurations or cause harm.
From the tool's definition Tool name 'list_udts' and description 'List all UDT (User Defined Type) names' indicate a retrieval operation with no side effects. The verb 'list' is explicitly identified in the classification guidance as a Read operation.
Attacks that exploit this kind of access
List all UDT (User Defined Type) names in an Ignition project. 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 list_udts: 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.
list_udts 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 list_udts 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 list_udts. 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.
list_udts 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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