AI agents call get_group_members to retrieve information from LegacyMCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool name and server context indicate this retrieves AD group membership information as a read-only query. While the description is empty (reducing confidence slightly), the naming convention and sibling tools confirm this is a data retrieval operation with no side effects, placing it squarely in the Read category with low severity—queryable data exposure poses minimal immediate risk unless sensitive group…
From the tool's definition Tool name 'get_group_members' indicates data retrieval. No description provided, but sibling tools on this AD query server (get_computers, get_dc_features, get_dc_file_locations, get_dc_services, get_dc_software, get_certification_authorities,…
Attacks that exploit this kind of access
get_group_members. It is categorised as a Read tool in the LegacyMCP MCP Server, which means it retrieves data without modifying state.
Register the Legacy MCP server in PolicyLayer and add a rule for get_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 LegacyMCP. Nothing to install.
get_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 get_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 get_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.
get_group_members is provided by the Legacy MCP server (marco-lelli/legacy-mcp). 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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