Execute a read-only SQL query on MySQL database
AI agents call mysql_query to retrieve information from MySQL ReadOnly MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool only retrieves data without modification capabilities. The read-only constraint, SQL injection protection, and query limits significantly reduce risk. Even though it executes SQL, it cannot write, delete, or modify data. The most severe realistic harm would be exposure of queried data, which is a read operation.
From the tool's definition Tool description explicitly states 'Execute a read-only SQL query' and server description emphasizes 'read-only access' with 'SQL injection protection' and 'automatic query limits'.
Attacks that exploit this kind of access
Execute a read-only SQL query on MySQL database. It is categorised as a Read tool in the MySQL ReadOnly MCP Server MCP Server, which means it retrieves data without modifying state.
Register the MySQL ReadOnly MCP 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 MySQL ReadOnly MCP 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 MySQL ReadOnly MCP Server MCP server (zhaojw-php/mysql-readonly-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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