查看指定表的字段名、类型、是否为主键等结构信息
AI agents call get_schema 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 queries and returns schema metadata about a database table (field names, data types, constraints). It has no side effects—it merely inspects and reports existing structure without creating, modifying, or deleting data. The server explicitly advertises 'read-only safety checks', and this tool exemplifies that design.
From the tool's definition Tool description indicates it retrieves structural metadata: 'view specified table fields, types, whether primary key, and other structural information'. No modification, deletion, or execution capability described.
Attacks that exploit this kind of access
查看指定表的字段名、类型、是否为主键等结构信息. 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 get_schema: 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.
get_schema 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_schema 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_schema. 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_schema 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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