Execute a SQL SELECT query and return results. This is a read-only query tool. Use parameterized queries to prevent SQL injection.
AI agents call mysql_query 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.
Despite the word 'Execute' in the description, the tool is functionally limited to SELECT operations which have no side effects. The emphasis on read-only nature, combined with parameterized query guidance, confirms this is a data retrieval tool. The low severity reflects that read-only operations cannot damage data, though information disclosure risk exists depending on what data is accessible.
From the tool's definition Tool description explicitly states 'Execute a SQL SELECT query' and 'This is a read-only query tool.' SELECT queries retrieve data without modification or deletion.
Attacks that exploit this kind of access
Execute a SQL SELECT query and return results. This is a read-only query tool. Use parameterized queries to prevent SQL injection. 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 mysql_query: 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.
mysql_query 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_query 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_query. 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_query is provided by the MCP MySQL Server MCP server (jianglisuda/mcp). 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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