Execute a SELECT query
AI agents call 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.
SELECT queries retrieve data without modification. However, severity is 'medium' rather than 'low' because in a database context, an AI agent could extract sensitive data (credentials, personal information, intellectual property) depending on database contents and access permissions. The read-only nature prevents data loss or system compromise, but information disclosure remains a significant risk.
From the tool's definition Tool name 'query' and description 'Execute a SELECT query' explicitly indicates SELECT-only operations, which are read-only database operations with no side effects.
Attacks that exploit this kind of access
Execute a SELECT query. 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 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.
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 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 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.
query is provided by the MCP MySQL Server MCP server (kevinbin/mcp-mysql-server). 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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