Identify unused indexes in the schema.
AI agents call mysql_schema_unused_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 tool retrieves and analyzes metadata about database indexes to report which ones are unused. It performs no modifications, deletions, or executions. The server explicitly advertises 'read-only queries' in its description. The sibling tools include destructive operations (drop_event, alter_event) but this tool is clearly informational/analytical.
From the tool's definition Tool name includes 'schema' and 'unused_indexes' with a descriptive action 'Identify'. Description states it analyzes schema to find unused indexes—a read-only query operation with no side effects.
Documented attack patterns abuse exactly the kind of access mysql_schema_unused_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_schema_unused_indexes:
{
"version": "1",
"default": "deny",
"tools": {
"mysql_schema_unused_indexes": {}
}
}mysql_schema_unused_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 indexes in the schema. 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_schema_unused_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_schema_unused_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_schema_unused_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_schema_unused_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_schema_unused_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.
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233 Mysql tools catalogued and risk-classified — across an index of 43,000+ MCP servers.