Get the complete database schema with table structures and sample data
AI agents call get_schema to retrieve information from MCP SQL Agent without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves metadata and sample data from the database without any capability to create, modify, delete, or execute operations. It is purely informational. Severity is medium rather than low because the schema and sample data exposure could reveal sensitive database structure information that might aid in crafting malicious queries, but the tool itself performs no destructive or executable actions.
From the tool's definition Tool description states 'Get the complete database schema with table structures and sample data' — a retrieval operation with no modification capability. Exact words: 'Get the complete database schema'.
Attacks that exploit this kind of access
Get the complete database schema with table structures and sample data. It is categorised as a Read tool in the MCP SQL Agent MCP Server, which means it retrieves data without modifying state.
Register the MCP SQL Agent 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 SQL Agent. 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 SQL Agent MCP server (sharansahu/mcp-sql). 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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