查看完整的数据库结构（所有表及其字段）
AI agents call describe_db to retrieve information from MCP DB Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and displays database metadata (table names and column definitions) without executing queries, modifying data, or triggering side effects. It is purely informational, similar to the sibling tool 'get_schema' and 'list_tables'. The server's stated 'read-only safety checks' further confirm this is a safe Read operation.
From the tool's definition Tool name is 'describe_db' and description states '查看完整的数据库结构（所有表及其字段）' (View complete database structure - all tables and their fields). This is a schema inspection operation with no modification or execution capability.
Attacks that exploit this kind of access
查看完整的数据库结构（所有表及其字段）. It is categorised as a Read tool in the MCP DB Server MCP Server, which means it retrieves data without modifying state.
Register the MCP DB Server MCP server in PolicyLayer and add a rule for describe_db: 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 MCP DB Server. Nothing to install.
describe_db 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_db 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_db. 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_db is provided by the MCP DB Server MCP server (sharpdogs/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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