执行 SELECT 查询
AI agents call query_database to retrieve information from MySQL MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool description states it executes SELECT queries, which are read-only data retrieval operations with no side effects. However, severity is medium rather than low because arbitrary SELECT queries could expose sensitive data across the entire database, and there is some risk that the SQL injection protection may be bypassed or that the SELECT restriction is not strictly enforced at the tool level.
From the tool's definition 执行 SELECT 查询 (Execute SELECT query) — explicitly limited to SELECT queries
Attacks that exploit this kind of access
执行 SELECT 查询. It is categorised as a Read tool in the MySQL MCP Server MCP Server, which means it retrieves data without modifying state.
Register the MySQL MCP Server MCP server in PolicyLayer and add a rule for query_database: 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 MCP Server. Nothing to install.
query_database 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_database 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_database. 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_database is provided by the MySQL MCP Server MCP server (qipantanyi/mysql-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
query_database is one line of MySQL MCP Server's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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