获取指定表的字段结构（DDL），包含字段名、类型和业务含义描述。
AI agents call get_table_ddl to retrieve information from SmartDB MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Even though get_table_ddl only reads data, uncontrolled read access leaks sensitive information and racks up API costs — an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.
Attacks that exploit this kind of access
获取指定表的字段结构（DDL），包含字段名、类型和业务含义描述。. It is categorised as a Read tool in the SmartDB MCP MCP Server, which means it retrieves data without modifying state.
Register the SmartDB MCP server in PolicyLayer and add a rule for get_table_ddl: 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 SmartDB MCP. Nothing to install.
get_table_ddl 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 get_table_ddl 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 get_table_ddl. 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.
get_table_ddl is provided by the SmartDB MCP server (zhaoran025/smart-db-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.