Get the options of a list-type custom field.
AI agents call get_custom_field_list_options to retrieve information from InvGate Service Desk 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 custom field configuration (specifically the available options for a list-type field). It performs no data modification, deletion, or execution of external operations. It is a straightforward read operation on a service desk system, with minimal blast radius if misused by an AI agent.
From the tool's definition Tool name 'get_custom_field_list_options' and description 'Get the options of a list-type custom field' indicate a retrieval operation with no side effects. The verb 'Get' and the action of retrieving field options are purely informational queries.
Attacks that exploit this kind of access
Get the options of a list-type custom field. It is categorised as a Read tool in the InvGate Service Desk MCP Server, which means it retrieves data without modifying state.
Register the InvGate Service Desk MCP server in PolicyLayer and add a rule for get_custom_field_list_options: 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 InvGate Service Desk. Nothing to install.
get_custom_field_list_options 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_custom_field_list_options 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_custom_field_list_options. 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_custom_field_list_options is provided by the InvGate Service Desk MCP server (oci:ghcr.io/tracegazer/invgate-service-desk-mcp:0.2.0). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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