AI agents call list_group_subgroups to retrieve information from Gitlab without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves organizational structure metadata (subgroups) from GitLab. It performs a read-only operation analogous to a search or list action. No data is created, modified, deleted, or executed. The blast radius of misuse is minimal — an attacker could enumerate group hierarchy but cannot alter state or perform destructive actions.
From the tool's definition Tool name is 'list_group_subgroups' and description states 'List subgroups of a group' — a retrieval operation with no modification or side effects.
Documented attack patterns abuse exactly the kind of access list_group_subgroups gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Gitlab, and nothing reaches the server without passing your rules. This is the rule we recommend for list_group_subgroups:
{
"version": "1",
"default": "deny",
"tools": {
"list_group_subgroups": {}
}
}list_group_subgroups is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List subgroups of a group. It is categorised as a Read tool in the Gitlab MCP Server, which means it retrieves data without modifying state.
Register the Gitlab MCP server in PolicyLayer and add a rule for list_group_subgroups: 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 Gitlab. Nothing to install.
list_group_subgroups 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_subgroups 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_subgroups. 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_subgroups is provided by the Gitlab MCP server (yoda-digital/mcp-gitlab-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 88 Gitlab tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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88 Gitlab tools catalogued and risk-classified — across an index of 42,500+ MCP servers.