Identify unused or duplicate indexes that could be dropped.
AI agents call mysql_unused_duplicate_indexes 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.
This is a read-only diagnostic tool that queries database metadata to retrieve information about index usage patterns. While the information could inform destructive actions (dropping indexes), the tool itself performs no modifications, deletions, or irreversible operations.
From the tool's definition Tool identifies and reports on unused or duplicate indexes without modifying them. The description states it 'could be dropped' but the tool itself only identifies candidates for removal—it performs analysis and retrieval of index metadata, not deletion.
Documented attack patterns abuse exactly the kind of access mysql_unused_duplicate_indexes 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_unused_duplicate_indexes:
{
"version": "1",
"default": "deny",
"tools": {
"mysql_unused_duplicate_indexes": {}
}
}mysql_unused_duplicate_indexes is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Identify unused or duplicate indexes that could be dropped. 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_unused_duplicate_indexes: 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_unused_duplicate_indexes 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_unused_duplicate_indexes 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_unused_duplicate_indexes. 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_unused_duplicate_indexes 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.
Free to start. No card required.
233 Mysql tools catalogued and risk-classified — across an index of 43,000+ MCP servers.