指定したテーブルの構造を取得します
AI agents call describe_table 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 queries table schema information only, returning structural metadata (columns, types, constraints, etc.) without retrieving or modifying any data. It is a read-only introspection operation with minimal security risk, similar to DESCRIBE or SHOW COLUMNS in SQL. The severity is low because schema information is typically non-sensitive and the operation has no side effects.
From the tool's definition Tool name 'describe_table' and description 'Retrieves the structure of a specified table' indicate a database metadata query operation. No modification, deletion, or code execution occurs.
Attacks that exploit this kind of access
指定したテーブルの構造を取得します. 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 describe_table: 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.
describe_table 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 describe_table 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 describe_table. 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.
describe_table is provided by the MySQL MCP Server MCP server (yuki777/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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