List all active custom field definitions.
AI agents call list_custom_fields 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 performs a simple enumeration/query of existing custom field metadata. It retrieves information about field definitions without creating, modifying, deleting, or executing anything. The 'list' verb and 'read-only' nature of retrieving definitions places it squarely in the Read category.
From the tool's definition Tool name 'list_custom_fields' and description 'List all active custom field definitions' indicate a retrieval operation with no data modification or side effects.
Attacks that exploit this kind of access
List all active custom field definitions. 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 list_custom_fields: 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.
list_custom_fields 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_custom_fields 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_custom_fields. 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_custom_fields 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.
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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