AI agents call show_grants_for_user to retrieve information from Mcp Windows without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and displays permission/grant information for a user without modifying any data or triggering any system actions. It is a passive informational query typical of Read category tools. The low severity reflects minimal blast radius—misuse could leak permission information but cannot cause destructive or financial harm.
From the tool's definition Tool name 'show_grants_for_user' and description 'Show grants for a specific user' indicate a query/retrieval operation with no modification or side effects. The verb 'show' is synonymous with 'display' or 'list', which are Read operations.
Documented attack patterns abuse exactly the kind of access show_grants_for_user gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Windows, and nothing reaches the server without passing your rules. This is the rule we recommend for show_grants_for_user:
{
"version": "1",
"default": "deny",
"tools": {
"show_grants_for_user": {}
}
}show_grants_for_user is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Show grants for a specific user. It is categorised as a Read tool in the Mcp Windows MCP Server, which means it retrieves data without modifying state.
Register the Mcp Windows MCP server in PolicyLayer and add a rule for show_grants_for_user: 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 Mcp Windows. Nothing to install.
show_grants_for_user 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 show_grants_for_user 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 show_grants_for_user. 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.
show_grants_for_user is provided by the Mcp Windows MCP server (mukul975/mcp-windows-automation). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 441 Mcp Windows tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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441 Mcp Windows tools catalogued and risk-classified — across an index of 42,500+ MCP servers.