Show available table types (storage engines).
AI agents call show_table_types 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 metadata about available MySQL storage engines. It is a read-only operation with no side effects, no data modification, and no destructive capability. The operation is informational only, making it a standard Read category tool with low severity due to minimal blast radius if misused.
From the tool's definition Tool name 'show_table_types' and description 'Show available table types (storage engines)' indicate a retrieval operation. The verb 'show' is a query operation that lists available storage engines without modifying data or triggering external operations.
Documented attack patterns abuse exactly the kind of access show_table_types 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 show_table_types:
{
"version": "1",
"default": "deny",
"tools": {
"show_table_types": {}
}
}show_table_types is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Show available table types (storage engines). 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 show_table_types: 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.
show_table_types 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 show_table_types 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 show_table_types. 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.
show_table_types 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.