mysql_show_variables
Show server system variables, optionally filtered by pattern.
This record as markdown: /tools/mukul975-mysql-mcp-server/mysql-show-variables.md
What mysql_show_variables does on Mysql
AI agents call mysql_show_variables to retrieve information from Mysql without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Why mysql_show_variables is rated Low
This tool retrieves and displays MySQL server system variables (configuration settings) filtered by an optional pattern. It performs no data modification, deletion, or external execution—it is a passive information retrieval operation. The blast radius of misuse is minimal: an attacker might learn server configuration details to inform other attacks, but the tool itself causes no direct harm.
From the tool's definition Tool name 'mysql_show_variables' and description 'Show server system variables, optionally filtered by pattern' indicate a query operation that retrieves configuration data without modification.
Attacks that exploit this kind of access
The rule that runs mysql_show_variables safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Mysql, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For mysql_show_variables, this is the rule to start with:
mysql_show_variables is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Mysql, apply this rule, and every mysql_show_variables call is checked against it from then on.
Questions about mysql_show_variables
Show server system variables, optionally filtered by pattern. 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_show_variables: 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_show_variables 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_show_variables 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_show_variables. 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_show_variables 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.
More on Mysql, and thousands of servers like it.
This server
Across the catalogue