Analyze query execution plan.
AI agents call mysql_explain_query to retrieve information from Mysql without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The EXPLAIN command in MySQL is a diagnostic tool that retrieves and analyzes query execution plans. It produces no side effects, does not modify data, and does not execute the underlying query—only introspects its execution strategy.
From the tool's definition Tool name 'mysql_explain_query' and description 'Analyze query execution plan' indicate a read-only operation. EXPLAIN queries in MySQL return metadata about how a query would execute without modifying any data.
Documented attack patterns abuse exactly the kind of access mysql_explain_query gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Mysql, and nothing reaches the server without passing your rules. This is the rule we recommend for mysql_explain_query:
{
"version": "1",
"default": "deny",
"tools": {
"mysql_explain_query": {}
}
}mysql_explain_query is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Analyze query execution plan. It is categorised as a Read tool in the Mysql MCP Server, which means it retrieves data without modifying state.
Register the Mysql MCP server in PolicyLayer and add a rule for mysql_explain_query: 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 Mysql. Nothing to install.
mysql_explain_query 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 mysql_explain_query 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 mysql_explain_query. 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.
mysql_explain_query is provided by the Mysql MCP server (mukul975/mysql-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Mysql, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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233 Mysql tools catalogued and risk-classified — across an index of 43,000+ MCP servers.