AI agents call check_permissions to retrieve information from MCP MySQL Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and inspects database permissions—a read-only operation with no side effects. It does not create, modify, delete, or execute any database operations. The action is informational only, making it a Read category tool with low severity since permission information disclosure has limited blast radius in isolation.
From the tool's definition Tool name 'check_permissions' with description 'Check database permissions' indicates a query operation that retrieves permission metadata without modifying or executing operations.
Documented attack patterns abuse exactly the kind of access check_permissions gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and MCP MySQL Server, and nothing reaches the server without passing your rules. This is the rule we recommend for check_permissions:
{
"version": "1",
"default": "deny",
"tools": {
"check_permissions": {}
}
}check_permissions is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Check database permissions. It is categorised as a Read tool in the MCP MySQL Server MCP Server, which means it retrieves data without modifying state.
Register the MCP MySQL Server MCP server in PolicyLayer and add a rule for check_permissions: 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 MySQL Server. Nothing to install.
check_permissions 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 check_permissions 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 check_permissions. 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.
check_permissions is provided by the MCP MySQL Server MCP server (liliangshan/mcp-server-mysql). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from MCP MySQL Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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5 MCP MySQL Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.