AI agents call get_table_structure to retrieve information from Text-to-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 only queries and returns schema metadata (table structure/columns/types) with no side effects. It falls squarely in the Read category. Severity is low because exposure of table structure alone poses minimal direct risk—it's informational metadata that doesn't execute queries or modify data. The sibling tool 'execute_sql_query' would pose higher risk, but this tool is purely introspective.
From the tool's definition Tool name 'get_table_structure' and description '获取指定表的结构信息' (retrieves the structure information of a specified table) indicate a read-only operation that retrieves metadata about database tables without modifying or executing any operations.
Documented attack patterns abuse exactly the kind of access get_table_structure gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Text-to-SQL MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_table_structure:
{
"version": "1",
"default": "deny",
"tools": {
"get_table_structure": {}
}
}get_table_structure is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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获取指定表的结构信息. It is categorised as a Read tool in the Text-to-SQL MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Text-to-SQL MCP Server MCP server in PolicyLayer and add a rule for get_table_structure: 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 Text-to-SQL MCP Server. Nothing to install.
get_table_structure 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_structure 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_structure. 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_structure is provided by the Text-to-SQL MCP Server MCP server (tmstack/text-to-sql-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Text-to-SQL MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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5 Text-to-SQL MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.