检查连通性、只读查询和 EXPLAIN 可用性
AI agents call doctor to retrieve information from SQL 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 health checks and diagnostic validation of database connectivity and query capabilities. It does not retrieve, modify, delete, or execute arbitrary operations; it merely verifies system status and feature availability. This is a low-severity read-like operation with minimal blast radius even if misused by an agent.
From the tool's definition Tool name 'doctor' with description stating it 'checks connectivity, read-only queries and EXPLAIN availability' — purely diagnostic operations without data retrieval or modification. The context confirms the server is read-only with SQL injection protection.
Attacks that exploit this kind of access
检查连通性、只读查询和 EXPLAIN 可用性. It is categorised as a Read tool in the SQL MCP Server MCP Server, which means it retrieves data without modifying state.
Register the SQL MCP Server MCP server in PolicyLayer and add a rule for doctor: 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 SQL MCP Server. Nothing to install.
doctor 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 doctor 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 doctor. 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.
doctor is provided by the SQL MCP Server MCP server (polarisxb/sql-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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