List the members of a group (optionally check one user's membership).
AI agents call list_group_members 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 group membership information without creating, modifying, deleting, or executing any operations. It is a straightforward data query with no destructive, financial, or execution capabilities. The blast radius of misuse is minimal—an attacker gains visibility into group structure but cannot alter access controls, systems, or data.
From the tool's definition Tool name 'list_group_members' and description 'List the members of a group' indicate a retrieval operation with no modification or side effects. The qualifier 'optionally check one user's membership' is still a read-only query operation.
Attacks that exploit this kind of access
List the members of a group (optionally check one user's membership). 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_group_members: 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_group_members 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_group_members 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_group_members. 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_group_members 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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