Query the top few tables with the highest space occupancy
AI agents call show_largest_table to retrieve information from Alibaba Cloud RDS OpenAPI 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 and queries metadata about table space usage in an RDS instance. It has no side effects—it does not create, modify, delete, or execute code. It is a straightforward informational query similar to 'describe' operations. The severity is low because misuse would only expose storage information, posing minimal risk to the database itself.
From the tool's definition The tool name 'show_largest_table' and description 'Query the top few tables with the highest space occupancy' indicate a read-only query operation that retrieves information about database table sizes without modifying, deleting, or executing arbitrary…
Documented attack patterns abuse exactly the kind of access show_largest_table gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Alibaba Cloud RDS OpenAPI MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for show_largest_table:
{
"version": "1",
"default": "deny",
"tools": {
"show_largest_table": {}
}
}show_largest_table is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Query the top few tables with the highest space occupancy. It is categorised as a Read tool in the Alibaba Cloud RDS OpenAPI MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Alibaba Cloud RDS OpenAPI MCP Server MCP server in PolicyLayer and add a rule for show_largest_table: 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 Alibaba Cloud RDS OpenAPI MCP Server. Nothing to install.
show_largest_table 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_largest_table 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_largest_table. 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_largest_table is provided by the Alibaba Cloud RDS OpenAPI MCP Server MCP server (aliyun/alibabacloud-rds-openapi-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 37 Alibaba Cloud RDS OpenAPI MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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37 Alibaba Cloud RDS OpenAPI MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.