AI agents invoke explain_sql to trigger actions in Alibaba Cloud RDS OpenAPI MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.
EXPLAIN SQL commands cause the database engine to parse and plan (and sometimes partially execute) a query. While typically read-only, it involves executing a database operation rather than simply retrieving stored data. The blast radius is medium as misuse could expose query structure or consume database resources, but it does not modify data.
From the tool's definition 'show sql execute plan' implies the tool runs or analyzes SQL execution, triggering database query planning operations
Documented attack patterns abuse exactly the kind of access explain_sql 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 explain_sql:
{
"version": "1",
"default": "deny",
"tools": {
"explain_sql": {
"limits": [
{
"counter": "explain_sql_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}explain_sql stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.
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show sql execute plan. It is categorised as a Execute tool in the Alibaba Cloud RDS OpenAPI MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Alibaba Cloud RDS OpenAPI MCP Server MCP server in PolicyLayer and add a rule for explain_sql: 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.
explain_sql is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the explain_sql 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 explain_sql. 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.
explain_sql 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.