AI agents call mysql_reset_query_cache to permanently remove resources in Mysql — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Clearing the query cache is an irreversible operation that destroys all cached query results. While it doesn't delete persistent data, it permanently removes in-memory cached data that cannot be recovered, potentially causing significant performance degradation and increased database load as all queries must be re-executed. This qualifies as Destructive due to its irreversible nature.
From the tool's definition Reset (clear) the query cache
Documented attack patterns abuse exactly the kind of access mysql_reset_query_cache 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_reset_query_cache:
{
"version": "1",
"default": "deny",
"hide": [
"mysql_reset_query_cache"
]
}mysql_reset_query_cache disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.
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Reset (clear) the query cache. It is categorised as a Destructive tool in the Mysql MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Mysql MCP server in PolicyLayer and add a rule for mysql_reset_query_cache: 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_reset_query_cache is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the mysql_reset_query_cache 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_reset_query_cache. 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_reset_query_cache 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.