list_group_users
AI agents call list_group_users to retrieve information from Looker MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves or lists users within a group—a non-destructive query operation. Even though the description is empty, the naming convention strongly indicates it returns existing data without side effects. No data is created, modified, deleted, or executed. Confidence is high despite the empty description due to clear naming semantics.
From the tool's definition Tool name is 'list_group_users' with an empty description. The 'list' prefix indicates a retrieval operation that queries existing group membership data without modification.
Attacks that exploit this kind of access
list_group_users. It is categorised as a Read tool in the Looker MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Looker MCP Server MCP server in PolicyLayer and add a rule for list_group_users: 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 Looker MCP Server. Nothing to install.
list_group_users 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_users 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_users. 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_users is provided by the Looker MCP Server MCP server (ultrathink-solutions/looker-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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