执行SQL查询（只读，仅支持SELECT/SHOW/DESCRIBE/EXPLAIN）
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.
The query tool is explicitly constrained to read-only operations (SELECT, SHOW, DESCRIBE, EXPLAIN). It cannot create, modify, delete, or execute arbitrary code. The server description notes 'read-only queries by default' which this tool exemplifies.
From the tool's definition Tool description states '只读，仅支持SELECT/SHOW/DESCRIBE/EXPLAIN' (read-only, supports only SELECT/SHOW/DESCRIBE/EXPLAIN). These are all read-only SQL operations with no data modification capability.
Attacks that exploit this kind of access
执行SQL查询（只读，仅支持SELECT/SHOW/DESCRIBE/EXPLAIN）. 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 (lm203688/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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