只读 SELECT/SHOW/DESC/EXPLAIN；? 参数；可选 limit 或 page+pageSize
AI agents call query 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.
This tool performs only SELECT, SHOW, DESC, and EXPLAIN queries—all read-only operations that retrieve data without side effects. No writes, deletes, executes, or financial operations are possible. The lowest severity reflects minimal blast radius: an agent querying unintended tables may leak data, but cannot modify or destroy it. Confidence is high due to explicit 'read-only' language in the description.
From the tool's definition Tool name 'query' with description indicating '只读 SELECT/SHOW/DESC/EXPLAIN' (read-only SELECT/SHOW/DESC/EXPLAIN), with optional limit or page parameters; no modification or deletion capability.
Attacks that exploit this kind of access
只读 SELECT/SHOW/DESC/EXPLAIN；? 参数；可选 limit 或 page+pageSize. 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: 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 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 MySQL MCP Server MCP server (yclenove/mysql-mcp-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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