Show MySQL system variables.
AI agents call show_variables to retrieve information from MCP MySQL Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and displays MySQL system variables (e.g., max_connections, version, etc.). It is a read-only operation with no side effects, data modification, or execution of arbitrary commands. The blast radius of misuse is minimal—an attacker gains visibility into database configuration but cannot alter data, execute code, or cause destructive changes. This is a standard diagnostic/introspection query.
From the tool's definition Tool name 'show_variables' and description 'Show MySQL system variables' indicate a query operation that retrieves configuration information without modifying state.
Attacks that exploit this kind of access
Show MySQL system variables. It is categorised as a Read tool in the MCP MySQL Server MCP Server, which means it retrieves data without modifying state.
Register the MCP MySQL Server MCP server in PolicyLayer and add a rule for 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 MCP MySQL Server. Nothing to install.
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 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 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.
show_variables is provided by the MCP MySQL Server MCP server (kami2k1/mcp-mysql). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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